From 4c8e093107b67daa41e55b22726b4c93296e6465 Mon Sep 17 00:00:00 2001
From: Georgy Moiseev <moiseev.georgii@gmail.com>
Date: Thu, 18 Jan 2024 11:53:39 +0300
Subject: [PATCH] test: call router for router operations

Before this patch, most tests used an assumption that main server is
a router. Yet these are two different concepts.

`main_server` entity was introduced in Cartridge test helpers Cluster
as some server you may refer to for maintenance work, like clusterwide
configuration update. Any cluster server is fine to do such operation:
router or not. Since most cluster configurations start with router
definition, it is often a first server in a list and is chosen to be
main_server as well. But no one guarantees that main_server provides
router API (both for vshard and crud).

Part of #412
Part of #415
---
 test/helper.lua                               |  25 +-
 test/integration/borders_test.lua             |  64 ++---
 test/integration/cfg_test.lua                 |   8 +-
 test/integration/count_test.lua               |  59 +++--
 test/integration/custom_bucket_id_test.lua    |  76 +++---
 test/integration/ddl_sharding_func_test.lua   |  66 ++---
 .../ddl_sharding_info_reload_test.lua         |  36 +--
 test/integration/ddl_sharding_key_test.lua    |  83 ++++---
 test/integration/insert_many_test.lua         |  90 +++----
 test/integration/len_test.lua                 |   8 +-
 test/integration/migration_test.lua           |   2 +-
 test/integration/pairs_readview_test.lua      |  62 ++---
 test/integration/pairs_test.lua               |  68 +++---
 .../read_calls_strategies_test.lua            |  16 +-
 .../readview_not_supported_test.lua           |   2 +-
 test/integration/replace_many_test.lua        |  90 +++----
 test/integration/schema_test.lua              |   2 -
 test/integration/select_readview_test.lua     | 177 +++++++-------
 test/integration/select_test.lua              | 223 +++++++++--------
 test/integration/simple_operations_test.lua   | 226 +++++++++---------
 test/integration/stats_test.lua               |  11 +-
 test/integration/storages_state_test.lua      |   8 +-
 test/integration/truncate_test.lua            |  10 +-
 test/integration/updated_schema_test.lua      | 108 ++++-----
 test/integration/upsert_many_test.lua         |  90 +++----
 test/integration/vshard_custom_test.lua       |   3 +-
 test/performance/perf_test.lua                |   4 +-
 test/unit/call_test.lua                       |  28 +--
 test/unit/not_initialized_test.lua            |   4 +-
 test/unit/stats_test.lua                      |   1 -
 test/vshard_helpers/vtest.lua                 |   8 +-
 31 files changed, 822 insertions(+), 836 deletions(-)

diff --git a/test/helper.lua b/test/helper.lua
index 0e10eee5..9195226d 100644
--- a/test/helper.lua
+++ b/test/helper.lua
@@ -133,7 +133,7 @@ function helpers.insert_objects(g, space_name, objects)
     local inserted_objects = {}
 
     for _, obj in ipairs(objects) do
-        local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {space_name, obj})
+        local result, err = g.router:call('crud.insert_object', {space_name, obj})
 
         t.assert_equals(err, nil)
 
@@ -354,7 +354,7 @@ function helpers.assert_ge(actual, expected, message)
 end
 
 function helpers.get_other_storage_bucket_id(cluster, bucket_id)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
 
         local bucket_id = ...
@@ -392,7 +392,7 @@ end
 helpers.tarantool_version_at_least = crud_utils.tarantool_version_at_least
 
 function helpers.update_sharding_key_cache(cluster, space_name)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local sharding_key = require('crud.common.sharding_key')
 
         local space_name = ...
@@ -401,7 +401,7 @@ function helpers.update_sharding_key_cache(cluster, space_name)
 end
 
 function helpers.get_sharding_key_cache(cluster)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
         local sharding_metadata_cache = require('crud.common.sharding.router_metadata_cache')
 
@@ -416,7 +416,7 @@ end
 -- object through net.box that's why we get a sign of record
 -- existence of cache but not the cache itself
 function helpers.update_sharding_func_cache(cluster, space_name)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local sharding_func = require('crud.common.sharding_func')
 
         local space_name = ...
@@ -433,7 +433,7 @@ end
 -- object through net.box that's why we get size of cache
 -- but not the cache itself
 function helpers.get_sharding_func_cache_size(cluster)
-    return cluster.main_server.net_box:eval([[
+    return cluster:server('router'):eval([[
         local vshard = require('vshard')
         local sharding_metadata_cache = require('crud.common.sharding.router_metadata_cache')
 
@@ -733,6 +733,9 @@ function helpers.start_cluster(g, cartridge_cfg, vshard_cfg)
         vtest.cluster_new(g, g.cfg)
         g.cfg.engine = nil
     end
+
+    g.router = g.cluster:server('router')
+    assert(g.router ~= nil, 'router found')
 end
 
 function helpers.stop_cluster(cluster, backend)
@@ -743,14 +746,6 @@ function helpers.stop_cluster(cluster, backend)
     end
 end
 
-function helpers.get_router(cluster, backend)
-    if backend == helpers.backend.CARTRIDGE then
-        return cluster:server('router')
-    elseif backend == helpers.backend.VSHARD then
-        return cluster.main_server
-    end
-end
-
 function helpers.parse_module_version(str)
     -- https://github.com/tarantool/luatest/blob/f37b353b77be50a1f1ce87c1ff2edf0c1b96d5d1/luatest/utils.lua#L166-L173
     local splitstr = str:split('.')
@@ -947,7 +942,7 @@ end
 function helpers.prepare_ordered_data(g, space, expected_objects, bucket_id, order_condition)
     helpers.insert_objects(g, space, expected_objects)
 
-    local resp, err = g.cluster.main_server:call('crud.select', {
+    local resp, err = g.router:call('crud.select', {
         space,
         {order_condition},
         {bucket_id = bucket_id, mode = 'write'},
diff --git a/test/integration/borders_test.lua b/test/integration/borders_test.lua
index 286a973e..5f5ddeb0 100644
--- a/test/integration/borders_test.lua
+++ b/test/integration/borders_test.lua
@@ -26,7 +26,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'non_existent_space',
         nil,
         {mode = 'write'},
@@ -36,7 +36,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(err.err, "Space \"non_existent_space\" doesn't exist")
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'non_existent_space',
         nil,
         {mode = 'write'},
@@ -48,7 +48,7 @@ end
 
 pgroup.test_non_existent_index = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         'non_existent_index',
         {mode = 'write'},
@@ -57,7 +57,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Index \"non_existent_index\" of space \"customers\" doesn't exist")
 
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         13,
         {mode = 'write'},
@@ -67,7 +67,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_str_contains(err.err, "Index \"13\" of space \"customers\" doesn't exist")
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         'non_existent_index',
         {mode = 'write'},
@@ -76,7 +76,7 @@ pgroup.test_non_existent_index = function(g)
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Index \"non_existent_index\" of space \"customers\" doesn't exist")
 
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         13,
         {mode = 'write'},
@@ -88,7 +88,7 @@ end
 
 pgroup.test_empty_space = function(g)
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         nil,
         {mode = 'write'},
@@ -98,7 +98,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- min by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers',
         'age_index',
         {fields = {'name'}, mode = 'write'},
@@ -108,7 +108,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         nil,
         {mode = 'write'},
@@ -118,7 +118,7 @@ pgroup.test_empty_space = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- max by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers',
         'age_index',
         {fields = {'name'}, mode = 'write'},
@@ -148,7 +148,7 @@ pgroup.test_min = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- by primary
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', nil, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -156,7 +156,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- by primary, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 0, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -164,7 +164,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- by primary with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', nil, {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -172,7 +172,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, {{name = "Elizabeth", last_name = "Jackson"}})
 
     -- by age index
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -180,7 +180,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by age index, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 2, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -188,7 +188,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -196,7 +196,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, {{name = "William", last_name = "White"}})
 
     -- by composite index full_name
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'full_name', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -204,7 +204,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {3}))
 
     -- by composite index full_name, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 5, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -212,7 +212,7 @@ pgroup.test_min = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {3}))
 
     -- by composite index full_name with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'full_name', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -240,7 +240,7 @@ pgroup.test_max = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- by primary
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', nil, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -248,7 +248,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by primary, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 0, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -256,7 +256,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by primary with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', nil, {fields = {'name', 'last_name'}, mode = 'write'}
     })
     t.assert_equals(err, nil)
@@ -264,7 +264,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, {{name = "William", last_name = "White"}})
 
     -- by age index
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -272,7 +272,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2}))
 
     -- by age index, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 2, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -280,7 +280,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2}))
 
     -- by age index with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -288,7 +288,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, {{name = "Mary", last_name = "Brown"}})
 
     -- by composite index full_name
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'full_name', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -296,7 +296,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by composite index full_name, index ID is specified
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 5, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -304,7 +304,7 @@ pgroup.test_max = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {4}))
 
     -- by composite index full_name with fields
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'full_name', {fields = {'name', 'last_name'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -334,7 +334,7 @@ pgroup.test_equal_secondary_keys = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- min
-    local result, err = g.cluster.main_server.net_box:call('crud.min', {
+    local result, err = g.router:call('crud.min', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -342,7 +342,7 @@ pgroup.test_equal_secondary_keys = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1}))
 
     -- max
-    local result, err = g.cluster.main_server.net_box:call('crud.max', {
+    local result, err = g.router:call('crud.max', {
         'customers', 'age_index', {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -369,7 +369,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- min
     local min_opts = {timeout = 1, fields = {'name', 'age'}, mode = 'write'}
-    local new_min_opts, err = g.cluster.main_server:eval([[
+    local new_min_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local min_opts = ...
@@ -384,7 +384,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- max
     local max_opts = {timeout = 1, fields = {'name', 'age'}, mode = 'write'}
-    local new_max_opts, err = g.cluster.main_server:eval([[
+    local new_max_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local max_opts = ...
diff --git a/test/integration/cfg_test.lua b/test/integration/cfg_test.lua
index 7f6f57e8..1c279472 100644
--- a/test/integration/cfg_test.lua
+++ b/test/integration/cfg_test.lua
@@ -7,8 +7,6 @@ local group = t.group('cfg', helpers.backend_matrix())
 
 group.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_stats')
-
-    g.router = helpers.get_router(g.cluster, g.params.backend)
 end)
 
 group.after_all(function(g)
@@ -159,7 +157,7 @@ group.test_role_cfg = function(g)
         stats_quantile_max_age_time = 180,
     }
 
-    g.cluster.main_server:upload_config({crud = cfg})
+    g.router:upload_config({crud = cfg})
 
     local actual_cfg = g.router:eval("return require('crud').cfg")
     t.assert_equals(cfg, actual_cfg)
@@ -174,7 +172,7 @@ group.test_role_partial_cfg = function(g)
     local cfg_after = table.deepcopy(cfg_before)
     cfg_after.stats = not cfg_before.stats
 
-    g.cluster.main_server:upload_config({crud = {stats = cfg_after.stats}})
+    g.router:upload_config({crud = {stats = cfg_after.stats}})
 
     local actual_cfg = g.router:eval("return require('crud').cfg")
     t.assert_equals(cfg_after, actual_cfg, "Only requested field were updated")
@@ -204,7 +202,7 @@ for name, case in pairs(role_cfg_error_cases) do
     group['test_role_cfg_' .. name] = function(g)
         helpers.skip_not_cartridge_backend(g.params.backend)
         local success, error = pcall(function()
-            g.cluster.main_server:upload_config(case.args)
+            g.router:upload_config(case.args)
         end)
 
         t.assert_equals(success, false)
diff --git a/test/integration/count_test.lua b/test/integration/count_test.lua
index 7eecfc3f..0f51bafd 100644
--- a/test/integration/count_test.lua
+++ b/test/integration/count_test.lua
@@ -13,7 +13,6 @@ local pgroup = t.group('count', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_select')
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -33,7 +32,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_count_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'non_existent_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -44,7 +43,7 @@ pgroup.test_count_non_existent_space = function(g)
 end
 
 pgroup.test_count_empty_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         nil,
         {fullscan = true, mode = 'write'},
@@ -59,7 +58,7 @@ pgroup.test_not_valid_value_type = function(g)
         {'==', 'id', 'not_number'}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {mode = 'write'},
@@ -74,7 +73,7 @@ pgroup.test_not_valid_operation = function(g)
         {{}, 'id', 5}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {fullscan = true, mode = 'write'},
@@ -89,7 +88,7 @@ pgroup.test_conditions_with_non_existed_field = function(g)
         {'==', 'non_existed_field', 'value'}
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         conditions,
         {mode = 'write'},
@@ -194,7 +193,7 @@ pgroup.test_count_all = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -230,7 +229,7 @@ pgroup.test_count_all_with_yield_every = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {yield_every = 1, fullscan = true, mode = 'write'},
     })
 
@@ -266,7 +265,7 @@ pgroup.test_count_all_with_yield_every_0 = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', nil, {yield_every = 0, fullscan = true, mode = 'write'}
     })
 
@@ -304,7 +303,7 @@ pgroup.test_count_by_primary_index = function(g)
 
     local conditions = {{'==', 'id_index', 3}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -346,7 +345,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -388,7 +387,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     local expected_len = 3
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -430,7 +429,7 @@ pgroup.test_gt_condition_with_index = function(g)
 
     local expected_len = 1
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -472,7 +471,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     local expected_len = 4
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -514,7 +513,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -558,7 +557,7 @@ pgroup.test_multiple_conditions = function(g)
 
     local expected_len = 2
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -580,7 +579,7 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'coord', conditions, {mode = 'write'},
     })
 
@@ -588,7 +587,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(result, 3)
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'coord', conditions, {mode = 'write'},
     })
 
@@ -622,7 +621,7 @@ pgroup.test_opts_not_damaged = function(g)
         balance = false,
         fullscan = true
     }
-    local new_count_opts, err = g.cluster.main_server:eval([[
+    local new_count_opts, err = g.router:eval([[
          local crud = require('crud')
 
          local count_opts = ...
@@ -661,7 +660,7 @@ pgroup.test_count_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         nil,
         {bucket_id = 2804, timeout = 1, fullscan = true, mode = 'write'},
@@ -675,7 +674,7 @@ pgroup.test_count_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers',
         {{'==', 'age', 81}},
         {bucket_id = 1161, timeout = 1, mode = 'write'},
@@ -724,7 +723,7 @@ pgroup.test_count_timeout = function(g)
     local timeout = 4
     local begin = clock.proc()
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {timeout = timeout, fullscan = true, mode = 'write'},
     })
 
@@ -766,7 +765,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -778,7 +777,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -800,7 +799,7 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'book_translation', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -836,7 +835,7 @@ pgroup.test_count_by_full_sharding_key = function(g)
     })
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -847,7 +846,7 @@ end
 pgroup.test_count_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -868,14 +867,14 @@ pgroup.test_count_force_map_call = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers', {{'==', 'id', key}}, {mode = 'write'},
     })
 
     t.assert_equals(err, nil)
     t.assert_equals(result, 1)
 
-    result, err = g.cluster.main_server.net_box:call('crud.count', {
+    result, err = g.router:call('crud.count', {
         'customers', {{'==', 'id', key}}, {force_map_call = true, mode = 'write'},
     })
 
@@ -887,7 +886,7 @@ local read_impl = function(cg, space, conditions, opts)
     opts = table.deepcopy(opts) or {}
     opts.mode = 'write'
 
-    return cg.cluster.main_server:call('crud.count', {space, conditions, opts})
+    return cg.router:call('crud.count', {space, conditions, opts})
 end
 
 pgroup.test_gh_418_count_with_secondary_noneq_index_condition = function(g)
diff --git a/test/integration/custom_bucket_id_test.lua b/test/integration/custom_bucket_id_test.lua
index c0338d5d..075112f1 100644
--- a/test/integration/custom_bucket_id_test.lua
+++ b/test/integration/custom_bucket_id_test.lua
@@ -24,7 +24,7 @@ pgroup.before_each(function(g)
 end)
 
 local function get_other_storage_bucket_id(g, key)
-    local bucket_id = g.cluster.main_server.net_box:eval([[
+    local bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -38,7 +38,7 @@ local function get_other_storage_bucket_id(g, key)
 end
 
 local function check_get(g, space_name, id, bucket_id, tuple)
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         space_name, id, {mode = 'write'},
     })
 
@@ -47,7 +47,7 @@ local function check_get(g, space_name, id, bucket_id, tuple)
     t.assert_equals(#result.rows, 0)
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         space_name, id, {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -66,7 +66,7 @@ pgroup.test_update = function(g)
     }
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -75,7 +75,7 @@ pgroup.test_update = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- update w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', tuple[1], update_operations,
     })
 
@@ -85,7 +85,7 @@ pgroup.test_update = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- update w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', tuple[1], update_operations, {bucket_id = bucket_id},
     })
 
@@ -99,7 +99,7 @@ pgroup.test_delete = function(g)
     local bucket_id = get_other_storage_bucket_id(g, tuple[1])
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -108,7 +108,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- delete w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', tuple[1],
     })
 
@@ -118,7 +118,7 @@ pgroup.test_delete = function(g)
     -- just get tuple to check it wasn't deleted
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', tuple[1], {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -128,7 +128,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- delete w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', tuple[1], {bucket_id = bucket_id},
     })
 
@@ -136,7 +136,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- get w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', tuple[1], {bucket_id = bucket_id, mode = 'write'},
     })
 
@@ -154,7 +154,7 @@ pgroup.test_insert_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -172,7 +172,7 @@ pgroup.test_insert_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -191,7 +191,7 @@ pgroup.test_insert_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- insert_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id + 1},
     })
 
@@ -199,7 +199,7 @@ pgroup.test_insert_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- insert_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', object, {bucket_id = bucket_id},
     })
 
@@ -216,7 +216,7 @@ pgroup.test_insert = function(g)
     tuple[2] = bucket_id
 
     -- insert
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple,
     })
 
@@ -235,7 +235,7 @@ pgroup.test_insert_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- insert
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id},
     })
 
@@ -252,7 +252,7 @@ pgroup.test_insert_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- insert, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id + 1}
     })
 
@@ -260,7 +260,7 @@ pgroup.test_insert_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- insert, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -279,7 +279,7 @@ pgroup.test_replace_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object,
     })
 
@@ -297,7 +297,7 @@ pgroup.test_replace_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id}
     })
 
@@ -316,7 +316,7 @@ pgroup.test_replace_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- replace_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id + 1}
     })
 
@@ -324,7 +324,7 @@ pgroup.test_replace_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- replace_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', object, {bucket_id = bucket_id}
     })
 
@@ -341,7 +341,7 @@ pgroup.test_replace = function(g)
     tuple[2] = bucket_id
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -360,7 +360,7 @@ pgroup.test_replace_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -377,7 +377,7 @@ pgroup.test_replace_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- replace, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id + 1}
     })
 
@@ -385,7 +385,7 @@ pgroup.test_replace_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- replace, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -404,7 +404,7 @@ pgroup.test_upsert_object = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {},
     })
 
@@ -422,7 +422,7 @@ pgroup.test_upsert_object_bucket_id_opt = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id}
     })
 
@@ -441,7 +441,7 @@ pgroup.test_upsert_object_bucket_id_specified_twice = function(g)
     local tuple = crud_utils.flatten(object, g.space_format, bucket_id)
 
     -- upsert_object, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id + 1}
     })
 
@@ -449,7 +449,7 @@ pgroup.test_upsert_object_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- upsert_object, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', object, {}, {bucket_id = bucket_id}
     })
 
@@ -466,7 +466,7 @@ pgroup.test_upsert = function(g)
     tuple[2] = bucket_id
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -485,7 +485,7 @@ pgroup.test_upsert_bucket_id_opt = function(g)
     tuple_with_bucket_id[2] = bucket_id
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -502,7 +502,7 @@ pgroup.test_upsert_bucket_id_specified_twice = function(g)
     tuple[2] = bucket_id
 
     -- upsert, opts.bucket_id is different
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id + 1}
     })
 
@@ -510,7 +510,7 @@ pgroup.test_upsert_bucket_id_specified_twice = function(g)
     t.assert_str_contains(err.err, 'Tuple and opts.bucket_id contain different bucket_id values')
 
     -- upsert, opts.bucket_id is the same
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', tuple, {}, {bucket_id = bucket_id}
     })
 
@@ -526,7 +526,7 @@ pgroup.test_select = function(g)
     local bucket_id = get_other_storage_bucket_id(g, tuple[1])
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', tuple, {bucket_id = bucket_id}
     })
 
@@ -537,7 +537,7 @@ pgroup.test_select = function(g)
     local conditions = {{'==', 'id', tuple[1]}}
 
     -- select w/ default bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions,
     })
 
@@ -547,7 +547,7 @@ pgroup.test_select = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- select w/ right bucket_id
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {bucket_id = bucket_id, mode = 'write'},
     })
 
diff --git a/test/integration/ddl_sharding_func_test.lua b/test/integration/ddl_sharding_func_test.lua
index 83feb299..dd67d899 100644
--- a/test/integration/ddl_sharding_func_test.lua
+++ b/test/integration/ddl_sharding_func_test.lua
@@ -28,7 +28,7 @@ local vshard_group = t.group('ddl_vshard_sharding_func', helpers.backend_matrix(
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_ddl')
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local ddl = require('ddl')
 
         local ok, err = ddl.get_schema()
@@ -68,7 +68,7 @@ vshard_group.before_each(function(g)
 end)
 
 pgroup.test_insert_object = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {g.params.space_name, {id = 158, name = 'Augustus', age = 48}})
     t.assert_equals(err, nil)
 
@@ -94,7 +94,7 @@ end
 
 pgroup.test_insert = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert', {g.params.space_name, {27, box.NULL, 'Ivan', 25}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -118,7 +118,7 @@ pgroup.test_insert = function(g)
 end
 
 pgroup.test_insert_object_many = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object_many', {g.params.space_name, {{id = 158, name = 'Augustus', age = 48}}})
     t.assert_equals(err, nil)
 
@@ -144,7 +144,7 @@ end
 
 pgroup.test_insert_many = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_many', {g.params.space_name, {{27, box.NULL, 'Ivan', 25}}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -182,7 +182,7 @@ pgroup.test_replace_object = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {g.params.space_name, {id = 8, name = 'John Doe', age = 25}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -216,7 +216,7 @@ pgroup.test_replace = function(g)
     local tuple = {71, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         g.params.space_name, tuple
     })
     t.assert_equals(err, nil)
@@ -250,7 +250,7 @@ pgroup.test_replace_object_many = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object_many', {g.params.space_name, {{id = 8, name = 'John Doe', age = 25}}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -284,7 +284,7 @@ pgroup.test_replace_many = function(g)
     local tuple = {71, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, err = g.router:call('crud.replace_many', {
         g.params.space_name, {tuple}
     })
     t.assert_equals(err, nil)
@@ -305,7 +305,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}}}
     )
@@ -329,7 +329,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(result, {66, 6, 'Jack Sparrow', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}}}
     )
@@ -349,7 +349,7 @@ pgroup.test_upsert = function(g)
     local tuple = {14, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         g.params.space_name, tuple, {}
     })
     t.assert_equals(err, nil)
@@ -367,7 +367,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result, {14, 4, 'John', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object',
         {g.params.space_name, {id = 14, name = 'John', age = 25}, {{'+', 'age', 26}}}
     )
@@ -385,7 +385,7 @@ end
 
 pgroup.test_upsert_object_many = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many',
             {g.params.space_name, { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}} } }, }
     )
@@ -409,7 +409,7 @@ pgroup.test_upsert_object_many = function(g)
     t.assert_equals(result, {66, 6, 'Jack Sparrow', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many',
             {g.params.space_name, { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 26}} } }, }
     )
@@ -429,7 +429,7 @@ pgroup.test_upsert_many = function(g)
     local tuple = {14, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, err = g.router:call('crud.upsert_many', {
         g.params.space_name, { {tuple, {}} },
     })
     t.assert_equals(err, nil)
@@ -447,7 +447,7 @@ pgroup.test_upsert_many = function(g)
     t.assert_equals(result, {14, 4, 'John', 25})
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_many',
             {g.params.space_name, { {tuple, {{'+', 'age', 26}}} }, }
     )
@@ -473,7 +473,7 @@ pgroup.test_select = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'id', 18}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -493,7 +493,7 @@ pgroup.test_select = function(g)
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
     local conditions = {{'==', 'id', 19}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -520,7 +520,7 @@ pgroup.test_update = function(g)
     local update_operations = {
         {'+', 'age', 10},
     }
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         g.params.space_name, {12, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -549,7 +549,7 @@ pgroup.test_update = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         g.params.space_name, {18, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -570,7 +570,7 @@ pgroup.test_get = function(g)
     t.assert_not_equals(result, nil)
 
     -- Get a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         g.params.space_name, {12, 'Ivan'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -587,7 +587,7 @@ pgroup.test_get = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         g.params.space_name, {18, 'Ivan'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -610,7 +610,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- Delete tuple.
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         g.params.space_name, {12, 'Ivan'},
     })
     t.assert_equals(err, nil)
@@ -633,7 +633,7 @@ pgroup.test_delete = function(g)
     -- calculated bucket_id will be id % 10 = 18 % 10 = 8 ->
     -- select will be performed on s2 replicaset
     -- but tuple is on s1 replicaset -> result will be empty
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         g.params.space_name, {18, 'Ivan'}
     })
     t.assert_equals(err, nil)
@@ -653,7 +653,7 @@ pgroup.test_count = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'id', 18}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -673,7 +673,7 @@ pgroup.test_count = function(g)
     -- but tuple is on s1 replicaset -> result will be empty ->
     -- count = 0
     local conditions = {{'==', 'id', 19}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         g.params.space_name, conditions, {mode = 'write'},
     })
 
@@ -837,7 +837,7 @@ for name, case in pairs(known_bucket_id_write_cases) do
     end
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             case.func, {
                 g.params.space_name,
                 case.input_2,
@@ -876,7 +876,7 @@ for name, case in pairs(known_bucket_id_read_cases) do
     pgroup.before_test(test_name, prepare_known_bucket_id_data)
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             case.func, {
                 g.params.space_name,
                 case.input_2,
@@ -893,7 +893,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_pairs_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local res = {}
         for _, row in crud.pairs(...) do
             table.insert(res, row)
@@ -916,7 +916,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_count_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.count', {
+    local obj, err = g.router:call('crud.count', {
         g.params.space_name,
         {{ '==', 'id', known_bucket_id_key}},
         {bucket_id = known_bucket_id, mode = 'write'},
@@ -980,7 +980,7 @@ for name, case in pairs(vshard_cases) do
         end
 
         -- Insert a tuple.
-        local result, err = g.cluster.main_server.net_box:call(
+        local result, err = g.router:call(
                 'crud.insert', {space_name, {1, box.NULL, 'Ivan', 25}})
         t.assert_equals(err, nil)
         t.assert_equals(#result.rows, 1)
@@ -997,7 +997,7 @@ for name, case in pairs(vshard_cases) do
         t.assert_equals(result, nil)
 
         local conditions = {{'==', 'id', 1}}
-        local result, err = g.cluster.main_server.net_box:call('crud.select', {
+        local result, err = g.router:call('crud.select', {
             space_name, conditions, {mode = 'write'},
         })
 
diff --git a/test/integration/ddl_sharding_info_reload_test.lua b/test/integration/ddl_sharding_info_reload_test.lua
index e0add7a8..a56b2d2b 100644
--- a/test/integration/ddl_sharding_info_reload_test.lua
+++ b/test/integration/ddl_sharding_info_reload_test.lua
@@ -64,7 +64,7 @@ pgroup_new_space.before_each(function(g)
     end)
 
     -- Fetch metadata schema.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {0, box.NULL, 'Emma', 22}}
     )
 
@@ -72,7 +72,7 @@ pgroup_new_space.before_each(function(g)
     t.assert_equals(err, nil)
 
     -- Assert space doesn't exist.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers_new', {1, box.NULL, 'Emma', 22}}
     )
 
@@ -90,7 +90,7 @@ pgroup_key_change.before_each(function(g)
     end)
 
     -- Assert schema is default: insert is sharded with default ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {0, box.NULL, 'Emma', 22}}
     )
     t.assert_is_not(obj, nil)
@@ -116,7 +116,7 @@ pgroup_func_change.before_each(function(g)
     end)
 
     -- Assert schema is default: insert is sharded with default ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers_pk', {0, box.NULL, 'Emma', 22}}
     )
     t.assert_is_not(obj, nil)
@@ -470,7 +470,7 @@ for name, case in pairs(new_space_cases) do
         end)
 
         -- Assert it is now possible to call opertions for a new space.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -584,7 +584,7 @@ for name, case in pairs(schema_change_sharding_key_cases) do
         end)
 
         -- Assert operation bucket_id is computed based on updated ddl info.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -607,7 +607,7 @@ pgroup_key_change.test_select = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select',
         {
             'customers',
@@ -627,7 +627,7 @@ pgroup_key_change.test_count = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.count',
         {
             'customers',
@@ -657,8 +657,8 @@ pgroup_key_change.test_pairs = function(g)
     -- First pairs request fails and reloads sharding info.
     t.assert_error_msg_contains(
         "Please retry your request",
-        g.cluster.main_server.net_box.eval,
-        g.cluster.main_server.net_box,
+        g.router.eval,
+        g.router,
         pairs_eval,
         {
             'customers',
@@ -667,7 +667,7 @@ pgroup_key_change.test_pairs = function(g)
         })
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:eval(
+    local obj, err = g.router:eval(
         pairs_eval,
         {
             'customers',
@@ -804,7 +804,7 @@ for name, case in pairs(schema_change_sharding_func_cases) do
         end)
 
         -- Assert operation bucket_id is computed based on updated ddl info.
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_is_not(obj, nil)
         t.assert_equals(err, nil)
 
@@ -828,7 +828,7 @@ pgroup_func_change.test_select = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers_pk', {{'==', 'id', 1}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -845,7 +845,7 @@ pgroup_func_change.test_get = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.get', {
+    local obj, err = g.router:call('crud.get', {
         'customers_pk', 1, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -862,7 +862,7 @@ pgroup_func_change.test_count = function(g)
     end)
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:call('crud.count', {
+    local obj, err = g.router:call('crud.count', {
         'customers_pk', {{'==', 'id', 1}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -880,13 +880,13 @@ pgroup_func_change.test_pairs = function(g)
 
     t.assert_error_msg_contains(
         "Please retry your request",
-        g.cluster.main_server.net_box.eval,
-        g.cluster.main_server.net_box,
+        g.router.eval,
+        g.router,
         pairs_eval,
         {'customers_pk', {{'==', 'id', 1}}, {mode = 'write'}})
 
     -- Assert operation bucket_id is computed based on updated ddl info.
-    local obj, err = g.cluster.main_server.net_box:eval(
+    local obj, err = g.router:eval(
         pairs_eval,
         {'customers_pk', {{'==', 'id', 1}}, {mode = 'write'}})
     t.assert_equals(err, nil)
diff --git a/test/integration/ddl_sharding_key_test.lua b/test/integration/ddl_sharding_key_test.lua
index 0af41a74..239eb83c 100644
--- a/test/integration/ddl_sharding_key_test.lua
+++ b/test/integration/ddl_sharding_key_test.lua
@@ -17,7 +17,7 @@ local pgroup = t.group('ddl_sharding_key', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_ddl')
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local ddl = require('ddl')
 
         local ok, err = ddl.get_schema()
@@ -26,7 +26,6 @@ pgroup.before_all(function(g)
     t.assert_equals(type(result), 'table')
     t.assert_equals(err, nil)
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -48,7 +47,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_insert_object = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers_name_key', {id = 1, name = 'Augustus', age = 48}})
     t.assert_equals(err, nil)
 
@@ -75,7 +74,7 @@ end
 
 pgroup.test_insert = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'customers_name_key', {2, box.NULL, 'Ivan', 20}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -99,7 +98,7 @@ pgroup.test_insert = function(g)
 end
 
 pgroup.test_insert_object_many = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object_many', {'customers_name_key', {{id = 1, name = 'Augustus', age = 48}}})
     t.assert_equals(err, nil)
 
@@ -126,7 +125,7 @@ end
 
 pgroup.test_insert_many = function(g)
     -- Insert a tuple.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_many', {'customers_name_key', {{2, box.NULL, 'Ivan', 20}}})
     t.assert_equals(err, nil)
     t.assert_equals(result.metadata, {
@@ -166,7 +165,7 @@ pgroup.test_replace = function(g)
     local tuple = {7, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers_name_key', tuple
     })
     t.assert_equals(err, nil)
@@ -200,7 +199,7 @@ pgroup.test_replace_object = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers_name_key', {id = 8, name = 'John Doe', age = 25}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -234,7 +233,7 @@ pgroup.test_replace_many = function(g)
     local tuple = {7, box.NULL, 'Augustus', 21}
 
     -- Replace a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, err = g.router:call('crud.replace_many', {
         'customers_name_key', {tuple}
     })
     t.assert_equals(err, nil)
@@ -268,7 +267,7 @@ pgroup.test_replace_object_many = function(g)
     t.assert_not_equals(result, nil)
 
     -- Replace an object.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object_many', {'customers_name_key', {{id = 8, name = 'John Doe', age = 25}}})
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -287,7 +286,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object', {'customers_name_key', {id = 66, name = 'Jack Sparrow', age = 25}, {
              {'+', 'age', 25},
     }})
@@ -311,7 +310,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers_name_key', {id = 66, name = 'Jack Sparrow', age = 25}, {
             {'+', 'age', 25},
     }})
@@ -331,7 +330,7 @@ pgroup.test_upsert = function(g)
     local tuple = {1, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers_name_key', tuple, {}
     })
     t.assert_equals(err, nil)
@@ -349,7 +348,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers_name_key', {id = 1, name = 'John', age = 25}, {
             {'+', 'age', 25},
     }})
@@ -367,7 +366,7 @@ end
 
 pgroup.test_upsert_object_many = function(g)
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many', {'customers_name_key',
             { { {id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 25}} } },
             })
@@ -392,7 +391,7 @@ pgroup.test_upsert_object_many = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_object_many', {'customers_name_key',
              { {{id = 66, name = 'Jack Sparrow', age = 25}, {{'+', 'age', 25}}} },
             })
@@ -412,7 +411,7 @@ pgroup.test_upsert_many = function(g)
     local tuple = {1, box.NULL, 'John', 25}
 
     -- Upsert an object first time.
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, err = g.router:call('crud.upsert_many', {
         'customers_name_key', { {tuple, {}} },
     })
     t.assert_equals(err, nil)
@@ -430,7 +429,7 @@ pgroup.test_upsert_many = function(g)
     t.assert_equals(result, nil)
 
     -- Upsert the same query second time when tuple exists.
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.upsert_many', {'customers_name_key', { {tuple, {{'+', 'age', 25}}} }, })
     t.assert_equals(result.rows, nil)
     t.assert_equals(err, nil)
@@ -462,7 +461,7 @@ pgroup.test_select = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'name', 'Ptolemy'}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers_name_key', conditions, {mode = 'write'},
     })
 
@@ -481,7 +480,7 @@ pgroup.test_count = function(g)
     t.assert_not_equals(result, nil)
 
     local conditions = {{'==', 'name', 'Ptolemy'}}
-    local result, err = g.cluster.main_server.net_box:call('crud.count', {
+    local result, err = g.router:call('crud.count', {
         'customers_name_key', conditions, {mode = 'write'}
     })
 
@@ -596,7 +595,7 @@ pgroup.test_select_secondary_idx = function(g)
     local tuple = {2, box.NULL, 'Ivan', 20}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -606,7 +605,7 @@ pgroup.test_select_secondary_idx = function(g)
 
     local conditions = {{'==', 'name', 'Ivan'}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers_secondary_idx_name_key', conditions, {mode = 'write'},
     })
 
@@ -633,7 +632,7 @@ pgroup.test_select_non_unique_index = function(g)
     })
     t.assert_equals(#customers, 10)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         space_name, {{'==', 'name', 'Ivan Bunin'}}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -660,7 +659,7 @@ pgroup.test_update = function(g)
     local update_operations = {
         {'+', 'age', 10},
     }
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_name_key', {2, 'Ivan'}, update_operations,
     })
     t.assert_equals(err, nil)
@@ -686,7 +685,7 @@ pgroup.test_get = function(g)
     t.assert_not_equals(result, nil)
 
     -- Get a tuple.
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers_name_key', {7, 'Dimitrion'}, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -709,7 +708,7 @@ pgroup.test_delete = function(g)
     t.assert_not_equals(result, nil)
 
     -- Delete tuple.
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local _, err = g.router:call('crud.delete', {
         'customers_name_key', {7, 'Dimitrion'},
     })
     t.assert_equals(err, nil)
@@ -727,7 +726,7 @@ pgroup.test_delete_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -735,7 +734,7 @@ pgroup.test_delete_incomplete_sharding_key = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers_age_key', {58, 'Viktor Pelevin'}
     })
 
@@ -748,7 +747,7 @@ pgroup.test_get_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -756,7 +755,7 @@ pgroup.test_get_incomplete_sharding_key = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers_age_key', {58, 'Viktor Pelevin'}, {mode = 'write'},
     })
 
@@ -769,7 +768,7 @@ pgroup.test_update_incomplete_sharding_key = function(g)
     local tuple = {2, box.NULL, 'Viktor Pelevin', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_age_key', tuple
     })
 
@@ -781,7 +780,7 @@ pgroup.test_update_incomplete_sharding_key = function(g)
         {'=', 'age', 60},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_age_key', {2, 'Viktor Pelevin'}, update_operations,
     })
 
@@ -794,7 +793,7 @@ pgroup.test_get_secondary_idx = function(g)
     local tuple = {4, box.NULL, 'Leo', 44}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -803,7 +802,7 @@ pgroup.test_get_secondary_idx = function(g)
     t.assert_equals(#result.rows, 1)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get',
+    local result, err = g.router:call('crud.get',
         {'customers_secondary_idx_name_key', {4, 'Leo'}, {mode = 'write'},
     })
 
@@ -816,7 +815,7 @@ pgroup.test_update_secondary_idx = function(g)
     local tuple = {6, box.NULL, 'Victor', 58}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -828,7 +827,7 @@ pgroup.test_update_secondary_idx = function(g)
         {'=', 'age', 58},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers_secondary_idx_name_key', {6, 'Victor'}, update_operations,
     })
 
@@ -841,7 +840,7 @@ pgroup.test_delete_secondary_idx = function(g)
     local tuple = {8, box.NULL, 'Alexander', 37}
 
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers_secondary_idx_name_key', tuple
     })
 
@@ -849,7 +848,7 @@ pgroup.test_delete_secondary_idx = function(g)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers_secondary_idx_name_key', {8, 'Alexander'}
     })
 
@@ -1088,7 +1087,7 @@ for name, case in pairs(known_bucket_id_write_cases) do
     end
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_equals(err, nil)
         t.assert_is_not(obj, nil)
 
@@ -1127,7 +1126,7 @@ for name, case in pairs(known_bucket_id_read_cases) do
     pgroup.before_test(test_name, prepare_known_bucket_id_data)
 
     pgroup[test_name] = function(g)
-        local obj, err = g.cluster.main_server.net_box:call(case.func, case.input)
+        local obj, err = g.router:call(case.func, case.input)
         t.assert_equals(err, nil)
         t.assert_is_not(obj, nil)
         t.assert_equals(obj.rows, {known_bucket_id_result_tuple})
@@ -1139,7 +1138,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_pairs_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local res = {}
         for _, row in crud.pairs(...) do
             table.insert(res, row)
@@ -1162,7 +1161,7 @@ pgroup.before_test(
     prepare_known_bucket_id_data)
 
 pgroup.test_gh_278_count_with_explicit_bucket_id_and_ddl = function(g)
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.count',
         {
             known_bucket_id_space,
diff --git a/test/integration/insert_many_test.lua b/test/integration/insert_many_test.lua
index c8a73cfb..03c71d16 100644
--- a/test/integration/insert_many_test.lua
+++ b/test/integration/insert_many_test.lua
@@ -24,7 +24,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'non_existent_space',
         {
             {1, box.NULL, 'Alex', 59},
@@ -40,7 +40,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- insert_object_many
     -- default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -60,7 +60,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- insert_object_many
     -- stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -82,7 +82,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -114,7 +114,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 59})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -140,7 +140,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor'},
@@ -164,7 +164,7 @@ end
 pgroup.test_all_success = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -208,7 +208,7 @@ end
 pgroup.test_object_all_success = function(g)
     -- batch_insert_object
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -259,7 +259,7 @@ pgroup.test_one_error = function(g)
     -- insert_many
     -- default: stop_on_error = false, rollback_on_error = false
     -- one error on one storage without rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -319,7 +319,7 @@ pgroup.test_object_one_error = function(g)
     -- batch_insert_object again
     -- default: stop_on_error = false, rollback_on_error = false
     -- one error on one storage without rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -384,7 +384,7 @@ pgroup.test_many_errors = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -454,7 +454,7 @@ pgroup.test_object_many_errors = function(g)
     -- batch_insert_object again
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -534,7 +534,7 @@ pgroup.test_no_success = function(g)
     -- insert_many again
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -608,7 +608,7 @@ pgroup.test_object_no_success = function(g)
     -- batch_insert_object again
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -660,7 +660,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor'},
@@ -682,7 +682,7 @@ end
 pgroup.test_all_success_stop_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -729,7 +729,7 @@ end
 pgroup.test_object_all_success_stop_on_error = function(g)
     -- batch_insert_object
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -789,7 +789,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -871,7 +871,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -957,7 +957,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Alex', 34},
@@ -1038,7 +1038,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- insert_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Alex', age = 34},
@@ -1102,7 +1102,7 @@ end
 pgroup.test_all_success_rollback_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -1149,7 +1149,7 @@ end
 pgroup.test_object_all_success_rollback_on_error = function(g)
     -- insert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -1208,7 +1208,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- insert_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -1291,7 +1291,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- insert_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -1384,7 +1384,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- insert_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Olga', 27},
@@ -1479,7 +1479,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- insert_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Olga', age = 27},
@@ -1552,7 +1552,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- insert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {2, box.NULL, 'Anna', 23},
@@ -1600,7 +1600,7 @@ end
 pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
     -- insert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 2, name = 'Anna', age = 23},
@@ -1661,7 +1661,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {22, box.NULL, 'Alex', 34},
@@ -1755,7 +1755,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 22, name = 'Alex', age = 34},
@@ -1835,7 +1835,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {15, box.NULL, 'Fedor', 59},
@@ -1850,7 +1850,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- insert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1872,7 +1872,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 15, name = 'Fedor', age = 59},
@@ -1887,7 +1887,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- insert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 59},
@@ -1910,7 +1910,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- insert_many
     local batch_insert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_insert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_insert_opts = ...
@@ -1927,7 +1927,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- insert_object_many
     local batch_insert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_insert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_insert_opts = ...
@@ -1945,7 +1945,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- insert_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1959,7 +1959,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1974,7 +1974,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_many', {
+    local result, errs = g.router:call('crud.insert_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1989,7 +1989,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 10, name = 'Fedor', age = 59},
@@ -2003,7 +2003,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = 40, name = 'Fedor', age = 59},
@@ -2018,7 +2018,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- insert_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.insert_object_many', {
+    local result, errs = g.router:call('crud.insert_object_many', {
         'customers',
         {
             {id = box.NULL, name = 'Fedor', age = 59},
@@ -2034,7 +2034,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.insert_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2044,7 +2044,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.insert_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/len_test.lua b/test/integration/len_test.lua
index a28fd397..19f71548 100644
--- a/test/integration/len_test.lua
+++ b/test/integration/len_test.lua
@@ -19,7 +19,7 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_len_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'non_existent_space'})
+    local result, err = g.router:call('crud.len', {'non_existent_space'})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Space \"non_existent_space\" doesn't exist")
@@ -40,14 +40,14 @@ pgroup.test_len = function(g)
 
     helpers.insert_objects(g, 'customers', customers)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'customers'})
+    local result, err = g.router:call('crud.len', {'customers'})
 
     t.assert_equals(err, nil)
     t.assert_equals(result, expected_len)
 end
 
 pgroup.test_len_empty_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call('crud.len', {'customers'})
+    local result, err = g.router:call('crud.len', {'customers'})
 
     t.assert_equals(err, nil)
     t.assert_equals(result, 0)
@@ -55,7 +55,7 @@ end
 
 pgroup.test_opts_not_damaged = function(g)
     local len_opts = {timeout = 1}
-    local new_len_opts, err = g.cluster.main_server:eval([[
+    local new_len_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local len_opts = ...
diff --git a/test/integration/migration_test.lua b/test/integration/migration_test.lua
index 95a059d5..82539e33 100644
--- a/test/integration/migration_test.lua
+++ b/test/integration/migration_test.lua
@@ -51,7 +51,7 @@ pgroup.test_gh_308_select_after_improper_ddl_space_drop = function(g)
     end)
 
     -- Ensure that crud request for existing space is ok.
-    local _, err = g.cluster.main_server.net_box:call('crud.select', {
+    local _, err = g.router:call('crud.select', {
         'customers', nil, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
diff --git a/test/integration/pairs_readview_test.lua b/test/integration/pairs_readview_test.lua
index 4577bc98..df0a7144 100644
--- a/test/integration/pairs_readview_test.lua
+++ b/test/integration/pairs_readview_test.lua
@@ -20,7 +20,7 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster.servers[2].net_box.space.customers:format()
 
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         require('crud').cfg{ stats = true }
     ]])
 end)
@@ -61,7 +61,7 @@ pgroup.test_pairs_no_conditions = function(g)
     }
 
     -- without conditions and options
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -78,7 +78,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- with use_tomap=false (the raw tuples returned)
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -96,7 +96,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- no after
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -115,7 +115,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -137,7 +137,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -182,7 +182,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -205,7 +205,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -250,7 +250,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -271,7 +271,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -309,7 +309,7 @@ pgroup.test_first = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- w/ tomap
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
         local objects = {}
         local foo, err = crud.readview({name = 'foo'})
@@ -325,7 +325,7 @@ pgroup.test_first = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1, 2}))
 
-    local tuples, err = g.cluster.main_server.net_box:eval([[
+    local tuples, err = g.router:eval([[
         local crud = require('crud')
         local tuples = {}
         local foo, err = crud.readview({name = 'foo'})
@@ -363,7 +363,7 @@ pgroup.test_negative_first = function(g)
 
     -- negative first
     t.assert_error_msg_contains("Negative first isn't allowed for pairs", function()
-        g.cluster.main_server.net_box:eval([[
+        g.router:eval([[
             local crud = require('crud')
             local foo, err = crud.readview({name = 'foo'})
             if err ~= nil then
@@ -376,7 +376,7 @@ pgroup.test_negative_first = function(g)
 end
 
 pgroup.test_empty_space = function(g)
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = 0
         local foo, err = crud.readview({name = 'foo'})
@@ -405,7 +405,7 @@ pgroup.test_luafun_compatibility = function(g)
             age = 33, city = "Los Angeles",
         },
     })
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -417,7 +417,7 @@ pgroup.test_luafun_compatibility = function(g)
     ]])
     t.assert_equals(count, 3)
 
-    count = g.cluster.main_server.net_box:eval([[
+    count = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -462,7 +462,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -486,7 +486,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -520,7 +520,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -544,7 +544,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -581,7 +581,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -605,7 +605,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -640,7 +640,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -666,7 +666,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -694,7 +694,7 @@ end
 pgroup.test_pairs_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -719,7 +719,7 @@ pgroup.test_pairs_force_map_call = function(g)
 
     local conditions = {{'==', 'id', key}}
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -740,7 +740,7 @@ pgroup.test_pairs_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#objects, 1)
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -787,7 +787,7 @@ pgroup.test_pairs_timeout = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -830,7 +830,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local router = helpers.get_router(g.cluster, g.params.backend).net_box
+    local router = g.router
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
@@ -859,7 +859,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local rows = g.cluster.main_server.net_box:eval([[
+    local rows = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -886,7 +886,7 @@ local function read_impl(cg, space, conditions, opts)
     opts = table.deepcopy(opts) or {}
     opts.use_tomap = true
 
-    return cg.cluster.main_server:exec(function(space, conditions, opts)
+    return cg.router:exec(function(space, conditions, opts)
         local crud = require('crud')
 
         local rv, err = crud.readview()
diff --git a/test/integration/pairs_test.lua b/test/integration/pairs_test.lua
index f0b832f7..9a657678 100644
--- a/test/integration/pairs_test.lua
+++ b/test/integration/pairs_test.lua
@@ -15,7 +15,7 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         require('crud').cfg{ stats = true }
     ]])
 end)
@@ -56,7 +56,7 @@ pgroup.test_pairs_no_conditions = function(g)
     }
 
     -- without conditions and options
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -69,7 +69,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- with use_tomap=false (the raw tuples returned)
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -82,7 +82,7 @@ pgroup.test_pairs_no_conditions = function(g)
     t.assert_equals(objects, raw_rows)
 
     -- no after
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -97,7 +97,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -115,7 +115,7 @@ pgroup.test_pairs_no_conditions = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local after = ...
@@ -156,7 +156,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -174,7 +174,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -215,7 +215,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -233,7 +233,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -267,7 +267,7 @@ pgroup.test_first = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- w/ tomap
-    local objects, err = g.cluster.main_server.net_box:eval([[
+    local objects, err = g.router:eval([[
         local crud = require('crud')
         local objects = {}
         for _, object in crud.pairs('customers', nil, {first = 2, use_tomap = true, mode = 'write'}) do
@@ -278,7 +278,7 @@ pgroup.test_first = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {1, 2}))
 
-    local tuples, err = g.cluster.main_server.net_box:eval([[
+    local tuples, err = g.router:eval([[
         local crud = require('crud')
         local tuples = {}
         for _, tuple in crud.pairs('customers', nil, {first = 2}) do
@@ -311,7 +311,7 @@ pgroup.test_negative_first = function(g)
 
     -- negative first
     t.assert_error_msg_contains("Negative first isn't allowed for pairs", function()
-        g.cluster.main_server.net_box:eval([[
+        g.router:eval([[
             local crud = require('crud')
             crud.pairs('customers', nil, {first = -10})
         ]])
@@ -319,7 +319,7 @@ pgroup.test_negative_first = function(g)
 end
 
 pgroup.test_empty_space = function(g)
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = 0
         for _, object in crud.pairs('customers', nil, {mode = 'write'}) do
@@ -343,14 +343,14 @@ pgroup.test_luafun_compatibility = function(g)
             age = 33, city = "Los Angeles",
         },
     })
-    local count = g.cluster.main_server.net_box:eval([[
+    local count = g.router:eval([[
         local crud = require('crud')
         local count = crud.pairs('customers', nil, {mode = 'write'}):map(function() return 1 end):sum()
         return count
     ]])
     t.assert_equals(count, 3)
 
-    count = g.cluster.main_server.net_box:eval([[
+    count = g.router:eval([[
         local crud = require('crud')
         local count = crud.pairs(
             'customers',
@@ -393,7 +393,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -413,7 +413,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -447,7 +447,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -467,7 +467,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -504,7 +504,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -524,7 +524,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -558,7 +558,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -578,7 +578,7 @@ pgroup.test_pairs_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -633,7 +633,7 @@ pgroup.test_pairs_cut_result = function(g)
         {name = "William", city = "Chicago"},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -654,7 +654,7 @@ pgroup.test_pairs_cut_result = function(g)
         {"William", "Chicago"},
     }
 
-    local tuples = g.cluster.main_server.net_box:eval([[
+    local tuples = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields = ...
@@ -673,7 +673,7 @@ end
 pgroup.test_pairs_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -698,7 +698,7 @@ pgroup.test_pairs_force_map_call = function(g)
 
     local conditions = {{'==', 'id', key}}
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -714,7 +714,7 @@ pgroup.test_pairs_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#objects, 1)
 
-    objects = g.cluster.main_server.net_box:eval([[
+    objects = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -760,7 +760,7 @@ pgroup.test_pairs_timeout = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     }
 
-    local objects = g.cluster.main_server.net_box:eval([[
+    local objects = g.router:eval([[
         local crud = require('crud')
 
         local objects = {}
@@ -810,7 +810,7 @@ pgroup.test_opts_not_damaged = function(g)
         fields = fields, mode = 'write', prefer_replica = false,
         balance = false, force_map_call = false, use_tomap = true,
     }
-    local new_pairs_opts, objects = g.cluster.main_server:eval([[
+    local new_pairs_opts, objects = g.router:eval([[
          local crud = require('crud')
 
          local pairs_opts = ...
@@ -852,7 +852,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local router = helpers.get_router(g.cluster, g.params.backend).net_box
+    local router = g.router
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
@@ -875,7 +875,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local rows = g.cluster.main_server.net_box:eval([[
+    local rows = g.router:eval([[
         local crud = require('crud')
 
         return crud.pairs(...):totable()
@@ -898,7 +898,7 @@ local function read_impl(cg, space, conditions, opts)
     opts.mode = 'write'
     opts.use_tomap = true
 
-    return cg.cluster.main_server:exec(function(space, conditions, opts)
+    return cg.router:exec(function(space, conditions, opts)
         local crud = require('crud')
 
         local status, resp = pcall(function()
diff --git a/test/integration/read_calls_strategies_test.lua b/test/integration/read_calls_strategies_test.lua
index eec8606f..19bb4f4d 100644
--- a/test/integration/read_calls_strategies_test.lua
+++ b/test/integration/read_calls_strategies_test.lua
@@ -29,16 +29,16 @@ local pgroup = t.group('read_calls_strategies', helpers.backend_matrix({
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_read_calls_strategies')
 
-    g.space_format = g.cluster.servers[2].net_box.space.customers:format()
+    g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
     g.clear_vshard_calls = function()
-        g.cluster.main_server.net_box:call('clear_vshard_calls')
+        g.router:call('clear_vshard_calls')
     end
 
     g.get_vshard_call_strategies = function()
         -- Retries are possible, especially in CI, so we don't assert
         -- the quantity of calls, only strategies used.
-        local vshard_calls = g.cluster.main_server.net_box:eval('return _G.vshard_calls')
+        local vshard_calls = g.router:eval('return _G.vshard_calls')
 
         local vshard_call_strategies_map = {}
         for _, v in ipairs(vshard_calls) do
@@ -54,7 +54,7 @@ pgroup.before_all(function(g)
 
     -- patch vshard.router.call* functions
     local vshard_call_names = {'callro', 'callbro', 'callre', 'callbre', 'callrw'}
-    g.cluster.main_server.net_box:call('patch_vshard_calls', {vshard_call_names})
+    g.router:call('patch_vshard_calls', {vshard_call_names})
 end)
 
 pgroup.after_all(function(g)
@@ -67,7 +67,7 @@ end)
 
 pgroup.test_get = function(g)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:call('crud.get', {'customers', 1, {
+    local _, err = g.router:call('crud.get', {'customers', 1, {
         mode = g.params.mode,
         balance = g.params.balance,
         prefer_replica = g.params.prefer_replica
@@ -79,7 +79,7 @@ end
 
 pgroup.test_select = function(g)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:call('crud.select', {'customers', nil, {
+    local _, err = g.router:call('crud.select', {'customers', nil, {
         mode = g.params.mode,
         balance = g.params.balance,
         prefer_replica = g.params.prefer_replica,
@@ -99,7 +99,7 @@ pgroup.test_pairs = function(g)
         prefer_replica = g.params.prefer_replica
     }
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
 
         local opts = ...
@@ -112,7 +112,7 @@ end
 
 pgroup.test_count = function(g)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:call('crud.count', {'customers', nil, {
+    local _, err = g.router:call('crud.count', {'customers', nil, {
         mode = g.params.mode,
         balance = g.params.balance,
         prefer_replica = g.params.prefer_replica,
diff --git a/test/integration/readview_not_supported_test.lua b/test/integration/readview_not_supported_test.lua
index fdada756..712f21a4 100644
--- a/test/integration/readview_not_supported_test.lua
+++ b/test/integration/readview_not_supported_test.lua
@@ -23,7 +23,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_open = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         return foo, err
diff --git a/test/integration/replace_many_test.lua b/test/integration/replace_many_test.lua
index 6b8c75aa..9783dd02 100644
--- a/test/integration/replace_many_test.lua
+++ b/test/integration/replace_many_test.lua
@@ -25,7 +25,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- replace_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'non_existent_space',
         {
             {1, box.NULL, 'Alex', 'alexpushkin'},
@@ -41,7 +41,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- replace_object_many
     -- default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -61,7 +61,7 @@ pgroup.test_non_existent_space = function(g)
 
     -- replace_object_many
     -- stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'non_existent_space',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -83,7 +83,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -115,7 +115,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 'FDost'})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Fedor', login = 'FDost'},
@@ -141,7 +141,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor'},
@@ -165,7 +165,7 @@ end
 pgroup.test_all_success = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -215,7 +215,7 @@ pgroup.test_object_all_success = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -265,7 +265,7 @@ pgroup.test_one_error = function(g)
 
     -- replace_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Fedor', 'alexpushkin'},
@@ -318,7 +318,7 @@ pgroup.test_object_one_error = function(g)
 
     -- replace_object_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Fedor', login = 'alexpushkin'},
@@ -377,7 +377,7 @@ pgroup.test_object_many_errors = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Sergey', login = 's.ivanov'},
@@ -447,7 +447,7 @@ pgroup.test_many_errors = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, one success on each storage
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Sergey', 's.ivanov'},
@@ -527,7 +527,7 @@ pgroup.test_no_success = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {4, box.NULL, 'Alex', 'a.smith'},
@@ -601,7 +601,7 @@ pgroup.test_object_no_success = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- no success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 4, name = 'Alex', login = 'a.smith'},
@@ -653,7 +653,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor'},
@@ -675,7 +675,7 @@ end
 pgroup.test_all_success_stop_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -728,7 +728,7 @@ pgroup.test_object_all_success_stop_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -788,7 +788,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -870,7 +870,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -956,7 +956,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {71, box.NULL, 'Alex', 'AGolden'},
@@ -1037,7 +1037,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 71, name = 'Alex', login = 'AGolden'},
@@ -1101,7 +1101,7 @@ end
 pgroup.test_all_success_rollback_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1154,7 +1154,7 @@ pgroup.test_object_all_success_rollback_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1213,7 +1213,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- replace_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -1296,7 +1296,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- replace_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -1389,7 +1389,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- replace_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Eren', 'e.eger'},
@@ -1484,7 +1484,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- replace_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Eren', login = 'e.eger'},
@@ -1557,7 +1557,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- replace_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1611,7 +1611,7 @@ pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
 
     -- replace_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1672,7 +1672,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {22, box.NULL, 'Alex', 'alexpushkin'},
@@ -1766,7 +1766,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 22, name = 'Alex', login = 'alexpushkin'},
@@ -1846,7 +1846,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1861,7 +1861,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- replace_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'developers',
         {
             {1, box.NULL, 'Fedor', 'FDost'},
@@ -1883,7 +1883,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1898,7 +1898,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- replace_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'developers',
         {
             {id = 1, name = 'Fedor', login = 'FDost'},
@@ -1921,7 +1921,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- replace_many
     local batch_replace_opts = {timeout = 1, fields = {'name', 'login'}}
-    local new_batch_replace_opts, err = g.cluster.main_server:eval([[
+    local new_batch_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_replace_opts = ...
@@ -1938,7 +1938,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace_object_many
     local batch_replace_opts = {timeout = 1, fields = {'name', 'login'}}
-    local new_batch_replace_opts, err = g.cluster.main_server:eval([[
+    local new_batch_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_replace_opts = ...
@@ -1956,7 +1956,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- replace_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1970,7 +1970,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {1, box.NULL, 'Fedor', 59},
@@ -1985,7 +1985,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_many', {
+    local result, errs = g.router:call('crud.replace_many', {
         'customers',
         {
             {box.NULL, box.NULL, 'Fedor', 59},
@@ -2000,7 +2000,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 100},
@@ -2014,7 +2014,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = 1, name = 'Fedor', age = 100},
@@ -2029,7 +2029,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- replace_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.replace_object_many', {
+    local result, errs = g.router:call('crud.replace_object_many', {
         'customers',
         {
             {id = box.NULL, name = 'Fedor', age = 100},
@@ -2045,7 +2045,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.replace_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2055,7 +2055,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.replace_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/schema_test.lua b/test/integration/schema_test.lua
index 71882dcf..b7fa9dd8 100644
--- a/test/integration/schema_test.lua
+++ b/test/integration/schema_test.lua
@@ -12,8 +12,6 @@ local pgroup = t.group('schema', helpers.backend_matrix({
 
 pgroup.before_all(function(g)
     helpers.start_default_cluster(g, 'srv_schema')
-
-    g.router = helpers.get_router(g.cluster, g.params.backend)
 end)
 
 pgroup.after_all(function(g)
diff --git a/test/integration/select_readview_test.lua b/test/integration/select_readview_test.lua
index a1a796d2..d17458ce 100644
--- a/test/integration/select_readview_test.lua
+++ b/test/integration/select_readview_test.lua
@@ -18,7 +18,6 @@ local function init_cluster(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -63,7 +62,7 @@ local function set_master(cluster, uuid, master_uuid)
 end
 
 pgroup.test_non_existent_space = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -81,7 +80,7 @@ pgroup.test_non_existent_space = function(g)
 end
 
 pgroup.test_select_no_index = function(g)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -102,7 +101,7 @@ pgroup.test_invalid_value_type = function(g)
         {'=', 'id', 'not_number'}
     }
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local conditions = ...
 
@@ -139,7 +138,7 @@ pgroup.test_gc_on_storage = function(g)
     })
 
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -155,7 +154,7 @@ pgroup.test_gc_on_storage = function(g)
         collectgarbage("collect")]])
     end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo')
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -174,7 +173,7 @@ pgroup.test_gc_on_storage = function(g)
 end
 
 pgroup.test_gc_rv_not_referenced_on_router = function(g)
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -213,7 +212,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -225,7 +224,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
     ]])
     fiber.sleep(1)
     t.assert_equals(err, nil)
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo')
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -244,7 +243,7 @@ pgroup.test_gc_rv_referenced_on_router = function(g)
 end
 
 pgroup.test_close = function(g)
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -280,7 +279,7 @@ pgroup.test_select_all = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -321,7 +320,7 @@ pgroup.test_select_with_same_name = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -368,7 +367,7 @@ pgroup.test_select_without_name = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({name = nil})
         if err ~= nil then
@@ -409,7 +408,7 @@ pgroup.test_select_with_insert = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -436,7 +435,7 @@ pgroup.test_select_with_insert = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo = rawget(_G, 'boo')
 
@@ -474,7 +473,7 @@ pgroup.test_select_with_delete = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo, err = crud.readview({})
         if err ~= nil then
@@ -494,10 +493,10 @@ pgroup.test_select_with_delete = function(g)
         {4, 1161, "William", "White", 81, "Chicago"},
     })
 
-    local _, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 3})
+    local _, err = g.router:call('crud.delete', {'customers', 3})
     t.assert_equals(err, nil)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local boo = rawget(_G, 'boo')
 
@@ -548,7 +547,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- batch size 1
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         local foo, err = crud.readview({name = 'foo'})
         if err ~= nil then
@@ -565,7 +564,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         local bar, err = crud.readview({name = 'bar'})
         if err ~= nil then
@@ -617,7 +616,7 @@ pgroup.test_eq_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -639,7 +638,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -660,7 +659,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 5 with negative first
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -682,7 +681,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -703,7 +702,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8 with negative first
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -724,7 +723,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -745,7 +744,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2 with negative first
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -789,7 +788,7 @@ pgroup.test_lt_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -810,7 +809,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     -- after obj 1
     local after = crud_utils.flatten(customers[1], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -859,7 +858,7 @@ pgroup.test_multiple_conditions = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -880,7 +879,7 @@ pgroup.test_multiple_conditions = function(g)
 
     -- after obj 5
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -924,7 +923,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -945,7 +944,7 @@ pgroup.test_composite_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -969,7 +968,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -990,7 +989,7 @@ pgroup.test_composite_index = function(g)
 
     -- first 1
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1009,7 +1008,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2})) -- in full_name order
 
     -- first 1 with full specified key
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1042,7 +1041,7 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1059,7 +1058,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1076,7 +1075,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1093,7 +1092,7 @@ pgroup.test_composite_primary_index = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after = ...
@@ -1144,7 +1143,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LE
     local conditions = {{'<=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1165,7 +1164,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LT
     local conditions = {{'<', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1186,7 +1185,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GE
     local conditions = {{'>=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1207,7 +1206,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GT
     local conditions = {{'>', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1244,7 +1243,7 @@ pgroup.test_select_by_full_sharding_key = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1291,7 +1290,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- full name index - unicode ci collation (case-insensitive)
     local conditions = {{'==', 'name', "Elizabeth"}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1312,7 +1311,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- city - no collation (case-sensitive)
     local conditions = {{'==', 'city', "oxford"}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1342,7 +1341,7 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result_0, err = g.cluster.main_server.net_box:eval([[
+    local result_0, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1360,7 +1359,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result_0.rows, result_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1379,7 +1378,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1398,7 +1397,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2}))
 
     local new_conditions = {{'=', 'y', 1}, {'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1417,7 +1416,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2}))
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1436,7 +1435,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {3}))
 
     local conditions_ge = {{'>=', 'primary', 0}}
-    local result_ge_0, err = g.cluster.main_server.net_box:eval([[
+    local result_ge_0, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1454,7 +1453,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result_ge_0.rows, result_ge_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1472,7 +1471,7 @@ pgroup.test_multipart_primary_index = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, after= ...
@@ -1509,7 +1508,7 @@ pgroup.test_select_partial_result_bad_input = function(g)
     })
 
     local conditions = {{'>=', 'age', 33}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions= ...
@@ -1559,7 +1558,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1584,7 +1583,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1614,7 +1613,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1639,7 +1638,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1672,7 +1671,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1697,7 +1696,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1728,7 +1727,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields= ...
@@ -1753,7 +1752,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions, fields, after= ...
@@ -1776,7 +1775,7 @@ end
 pgroup.test_select_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -1799,7 +1798,7 @@ pgroup.test_select_force_map_call = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.bucket_id < obj2.bucket_id end)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1815,7 +1814,7 @@ pgroup.test_select_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1854,7 +1853,7 @@ pgroup.test_jsonpath = function(g)
             age = 17, additional = { a = 55 },
         },
     })
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1875,7 +1874,7 @@ pgroup.test_jsonpath = function(g)
         {id = 4, name = "Pavel", last_name = "White"},
     }
     t.assert_equals(objects, expected_objects)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1932,7 +1931,7 @@ pgroup.test_jsonpath_index_field = function(g)
     })
 
     -- PK jsonpath index
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1961,7 +1960,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (partial)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -1991,7 +1990,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (full)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2075,7 +2074,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
 
     -- Pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2093,7 +2092,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2109,7 +2108,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2125,7 +2124,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo = rawget(_G, 'foo')
@@ -2160,7 +2159,7 @@ pgroup.test_select_timeout = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2211,7 +2210,7 @@ pgroup.test_select_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2234,7 +2233,7 @@ pgroup.test_select_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2257,7 +2256,7 @@ pgroup.test_select_no_map_reduce = function(g)
 end
 
 pgroup.test_select_yield_every_0 = function(g)
-    local resp, err = g.cluster.main_server.net_box:eval([[
+    local resp, err = g.router:eval([[
         local crud = require('crud')
 
         local foo, err = crud.readview({name = 'foo'})
@@ -2290,7 +2289,7 @@ pgroup.test_stop_select = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = crud.readview({name = 'foo'})
         rawset(_G, 'foo', foo)
@@ -2299,7 +2298,7 @@ pgroup.test_stop_select = function(g)
     t.assert_equals(err, nil)
 
     g.cluster:server('s2-master'):stop()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo', foo)
         local result, err = foo:select('customers', nil, {fullscan = true})
@@ -2323,7 +2322,7 @@ pgroup.test_stop_select = function(g)
         end, {g.cfg, bootstrap_key})
     end
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local foo = rawget(_G, 'foo', foo)
         foo:close()
@@ -2359,7 +2358,7 @@ pgroup.test_select_switch_master = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
@@ -2373,7 +2372,7 @@ pgroup.test_select_switch_master = function(g)
     local replicasets = helpers.get_test_cartridge_replicasets()
     set_master(g.cluster, replicasets[2].uuid, replicasets[2].servers[2].instance_uuid)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp = rawget(_G, 'temp')
         local result, err = temp:select('customers', nil, {fullscan = true})
@@ -2417,7 +2416,7 @@ pgroup.test_select_switch_master_first = function(g)
         },
     })
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
@@ -2434,7 +2433,7 @@ pgroup.test_select_switch_master_first = function(g)
     local replicasets = helpers.get_test_cartridge_replicasets()
     set_master(g.cluster, replicasets[3].uuid, replicasets[3].servers[2].instance_uuid)
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local temp = rawget(_G, 'temp')
         local result, err = temp:select('customers', nil, {fullscan = true})
@@ -2476,7 +2475,7 @@ pgroup.test_select_closed_readview = function(g)
         },
     })
 
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local crud = require('crud')
         local temp, err = crud.readview({name = 'temp'})
         if err ~= nil then
@@ -2495,7 +2494,7 @@ pgroup.test_select_closed_readview = function(g)
 end
 
 local function read_impl(cg, space, conditions, opts)
-    return cg.cluster.main_server:exec(function(space, conditions, opts)
+    return cg.router:exec(function(space, conditions, opts)
         opts = table.deepcopy(opts) or {}
         opts.fullscan = true
 
diff --git a/test/integration/select_test.lua b/test/integration/select_test.lua
index e8807f28..437b8eb4 100644
--- a/test/integration/select_test.lua
+++ b/test/integration/select_test.lua
@@ -16,7 +16,6 @@ pgroup.before_all(function(g)
 
     g.space_format = g.cluster:server('s1-master').net_box.space.customers:format()
 
-    g.router = helpers.get_router(g.cluster, g.params.backend)
     g.router.net_box:eval([[
         require('crud').cfg{ stats = true }
     ]])
@@ -39,7 +38,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'non_existent_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -50,7 +49,7 @@ pgroup.test_non_existent_space = function(g)
 end
 
 pgroup.test_select_no_index = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'no_index_space',
         nil,
         {fullscan = true, mode = 'write'},
@@ -65,7 +64,7 @@ pgroup.test_not_valid_value_type = function(g)
         {'=', 'id', 'not_number'}
     }
 
-    local obj, err = g.cluster.main_server.net_box:eval([[
+    local obj, err = g.router:eval([[
         local crud = require('crud')
         local conditions = ...
 
@@ -196,7 +195,7 @@ pgroup.test_select_all = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -217,7 +216,7 @@ pgroup.test_select_all = function(g)
     })
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {fullscan = true, mode = 'write'},
     })
 
@@ -227,7 +226,7 @@ pgroup.test_select_all = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -237,7 +236,7 @@ pgroup.test_select_all = function(g)
 
     -- after obj 4 (last)
     local after = crud_utils.flatten(customers[4], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -267,7 +266,7 @@ pgroup.test_select_all_with_first = function(g)
 
     -- first 2
     local first = 2
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -277,7 +276,7 @@ pgroup.test_select_all_with_first = function(g)
 
     -- first 0
     local first = 0
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -321,7 +320,7 @@ pgroup.test_negative_first = function(g)
     -- first -4 after 6
     local first = -4
     local after = crud_utils.flatten(customers[6], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, after = after, mode = 'write'},
     })
 
@@ -336,7 +335,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -351,7 +350,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -366,7 +365,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -381,7 +380,7 @@ pgroup.test_negative_first = function(g)
     }
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -428,7 +427,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -443,7 +442,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -458,7 +457,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -473,7 +472,7 @@ pgroup.test_positive_first = function(g)
     }
     local first = 10
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, mode = 'write'},
     })
 
@@ -515,7 +514,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
 
     -- negative first w/o after
     local first = -10
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, mode = 'write'},
     })
 
@@ -527,7 +526,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -3
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -543,7 +542,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -559,7 +558,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -575,7 +574,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -591,7 +590,7 @@ pgroup.test_negative_first_with_batch_size = function(g)
     local first = -2
     local after = crud_utils.flatten(customers[5], g.space_format)
     local batch_size = 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
        'customers', conditions, {first = first, after = after, batch_size = batch_size, mode = 'write'},
     })
 
@@ -632,7 +631,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     -- batch size 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -641,7 +640,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 3, fullscan = true, mode = 'write'},
     })
 
@@ -650,7 +649,7 @@ pgroup.test_select_all_with_batch_size = function(g)
     t.assert_equals(objects, customers)
 
     -- batch size 3 and first 6
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {batch_size = 3, first = 6, mode = 'write'},
     })
 
@@ -676,7 +675,7 @@ pgroup.test_select_by_primary_index = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id_index', 3}}
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
 
         local conditions = ...
@@ -726,7 +725,7 @@ pgroup.test_eq_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -736,7 +735,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, mode = 'write'},
     })
 
@@ -746,7 +745,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 5 with negative first
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -756,7 +755,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = 10, mode = 'write'},
     })
 
@@ -766,7 +765,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 8 with negative first
     local after = crud_utils.flatten(customers[8], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -776,7 +775,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = 10, mode = 'write'},
     })
 
@@ -786,7 +785,7 @@ pgroup.test_eq_condition_with_index = function(g)
 
     -- after obj 2 with negative first
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, first = -10, mode = 'write'},
     })
 
@@ -819,7 +818,7 @@ pgroup.test_ge_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -829,7 +828,7 @@ pgroup.test_ge_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -862,7 +861,7 @@ pgroup.test_le_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -872,7 +871,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 3
     local after = crud_utils.flatten(customers[3], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -882,7 +881,7 @@ pgroup.test_le_condition_with_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, mode = 'write'},
     })
 
@@ -915,7 +914,7 @@ pgroup.test_lt_condition_with_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -925,7 +924,7 @@ pgroup.test_lt_condition_with_index = function(g)
 
     -- after obj 1
     local after = crud_utils.flatten(customers[1], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -963,7 +962,7 @@ pgroup.test_multiple_conditions = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -973,7 +972,7 @@ pgroup.test_multiple_conditions = function(g)
 
     -- after obj 5
     local after = crud_utils.flatten(customers[5], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -1006,7 +1005,7 @@ pgroup.test_composite_index = function(g)
     }
 
     -- no after
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
@@ -1016,7 +1015,7 @@ pgroup.test_composite_index = function(g)
 
     -- after obj 2
     local after = crud_utils.flatten(customers[2], g.space_format)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {after = after, fullscan = true, mode = 'write'},
     })
 
@@ -1029,7 +1028,7 @@ pgroup.test_composite_index = function(g)
         {'==', 'full_name', "Elizabeth"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1038,7 +1037,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2, 1})) -- in full_name order
 
     -- first 1
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1046,7 +1045,7 @@ pgroup.test_composite_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(customers, {2})) -- in full_name order
 
     -- first 1 with full specified key
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', {{'==', 'full_name', {'Elizabeth', 'Johnson'}}}, {first = 1,mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1068,25 +1067,25 @@ pgroup.test_composite_primary_index = function(g)
 
     local conditions = {{'=', 'id', {5, 'Ukrainian', 55}}}
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 1, mode = 'write'},
     })
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'book_translation', conditions, {first = 1, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1126,7 +1125,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LE
     local conditions = {{'<=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1136,7 +1135,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- LT
     local conditions = {{'<', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1146,7 +1145,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GE
     local conditions = {{'>=', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1156,7 +1155,7 @@ pgroup.test_select_with_batch_size_1 = function(g)
 
     -- GT
     local conditions = {{'>', 'age', 35}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {batch_size = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1182,7 +1181,7 @@ pgroup.test_select_by_full_sharding_key = function(g)
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
     local conditions = {{'==', 'id', 3}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1218,7 +1217,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- full name index - unicode ci collation (case-insensitive)
     local conditions = {{'==', 'name', "Elizabeth"}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1228,7 +1227,7 @@ pgroup.test_select_with_collations = function(g)
 
     -- city - no collation (case-sensitive)
     local conditions = {{'==', 'city', "oxford"}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {mode = 'write'},
     })
 
@@ -1247,21 +1246,21 @@ pgroup.test_multipart_primary_index = function(g)
     })
 
     local conditions = {{'=', 'primary', 0}}
-    local result_0, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result_0, err = g.router:call('crud.select', {
         'coord', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result_0.rows, result_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {after = result_0.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {after = result_0.rows[3], first = -2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1269,7 +1268,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2}))
 
     local new_conditions = {{'=', 'y', 1}, {'=', 'primary', 0}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', new_conditions, {after = result_0.rows[3], first = -2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1277,7 +1276,7 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2}))
 
     local conditions = {{'=', 'primary', {0, 2}}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1285,21 +1284,21 @@ pgroup.test_multipart_primary_index = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {3}))
 
     local conditions_ge = {{'>=', 'primary', 0}}
-    local result_ge_0, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result_ge_0, err = g.router:call('crud.select', {
         'coord', conditions_ge, {fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result_ge_0.rows, result_ge_0.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {1, 2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions_ge, {after = result_ge_0.rows[1], fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(coords, {2, 3, 4, 5}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'coord', conditions_ge, {after = result_ge_0.rows[3], first = -3, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1325,7 +1324,7 @@ pgroup.test_select_partial_result_bad_input = function(g)
     })
 
     local conditions = {{'>=', 'age', 33}}
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = {'id', 'mame'}, fullscan = true, mode = 'write'},
     })
 
@@ -1364,7 +1363,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1378,7 +1377,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William", city = "Chicago"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1397,7 +1396,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1411,7 +1410,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 4, age = 46, name = "William"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1433,7 +1432,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1447,7 +1446,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", age = 33},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1466,7 +1465,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1480,7 +1479,7 @@ pgroup.test_select_partial_result = function(g)
         {id = 3, name = "David", city = "Los Angeles"},
     }
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', conditions, {after = result.rows[1], fields = fields, fullscan = true, mode = 'write'},
     })
 
@@ -1519,13 +1518,13 @@ pgroup.test_cut_selected_rows = function(g)
     }
 
     -- with fields option
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fields = fields, fullscan = true, mode = 'write'},
     })
 
     t.assert_equals(err, nil)
 
-    result, err = g.cluster.main_server.net_box:call('crud.cut_rows', {result.rows, result.metadata, fields})
+    result, err = g.router:call('crud.cut_rows', {result.rows, result.metadata, fields})
 
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -1542,13 +1541,13 @@ pgroup.test_cut_selected_rows = function(g)
         {bucket_id = 1161, id = 4, name = "William"},
     }
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', conditions, {fullscan = true, mode = 'write'},
     })
 
     t.assert_equals(err, nil)
 
-    result, err = g.cluster.main_server.net_box:call('crud.cut_rows', {result.rows, result.metadata, fields})
+    result, err = g.router:call('crud.cut_rows', {result.rows, result.metadata, fields})
 
     t.assert_equals(err, nil)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -1558,7 +1557,7 @@ end
 pgroup.test_select_force_map_call = function(g)
     local key = 1
 
-    local first_bucket_id = g.cluster.main_server.net_box:eval([[
+    local first_bucket_id = g.router:eval([[
         local vshard = require('vshard')
 
         local key = ...
@@ -1581,14 +1580,14 @@ pgroup.test_select_force_map_call = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.bucket_id < obj2.bucket_id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', {{'==', 'id', key}}, {mode = 'write'},
     })
 
     t.assert_equals(err, nil)
     t.assert_equals(#result.rows, 1)
 
-    result, err = g.cluster.main_server.net_box:call('crud.select', {
+    result, err = g.router:call('crud.select', {
         'customers', {{'==', 'id', key}}, {force_map_call = true, mode = 'write'},
     })
 
@@ -1619,7 +1618,7 @@ pgroup.test_jsonpath = function(g)
         },
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'>=', '[5]', 40}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1631,7 +1630,7 @@ pgroup.test_jsonpath = function(g)
     }
     t.assert_equals(objects, expected_objects)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'<', '["age"]', 21}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1643,7 +1642,7 @@ pgroup.test_jsonpath = function(g)
     }
     t.assert_equals(objects, expected_objects)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'developers', {{'>=', '[6].a.b', 55}}, {fields = {'name', 'last_name'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1690,7 +1689,7 @@ pgroup.test_jsonpath_index_field = function(g)
     })
 
     -- PK jsonpath index
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'<=', 'id_ind', 3}, {'<=', 'age', 5}}, {fields = {'id', 'age'}, fullscan = true, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1709,7 +1708,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (partial)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {fields = {'id', 'age'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1730,7 +1729,7 @@ pgroup.test_jsonpath_index_field = function(g)
     t.assert_equals(objects, expected_objects)
 
     -- Secondary jsonpath index (full)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', {'Yellow', 'Mercedes'}}}, {fields = {'id', 'age'}, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1805,7 +1804,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
 
 
     -- Pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1813,7 +1812,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1822,7 +1821,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (primary index)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', nil, {first = -2, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1831,7 +1830,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1839,7 +1838,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1848,7 +1847,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {3, 4}))
 
     -- Reverse pagination (secondary index - 1 field)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'==', 'data_index', 'Yellow'}}, {first = -2, after = result.rows[1], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1857,7 +1856,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {1, 2}))
 
     -- Pagination (secondary index - 2 fields)
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'>=', 'data_index', {'Yellow', 'E'}}}, {first = 2, mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1865,7 +1864,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {5, 6}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars', {{'>=', 'data_index', {'Yellow', 'E'}}}, {first = 2, after = result.rows[2], mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -1873,7 +1872,7 @@ pgroup.test_jsonpath_index_field_pagination = function(g)
     local objects = crud.unflatten_rows(result.rows, result.metadata)
     t.assert_equals(objects, helpers.get_objects_by_idxs(cars, {7, 8}))
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'cars',
         {{'>=', 'data_index', {'Yellow', 'B'}}, {'<=', 'id_ind', 3}},
         {first = -3, after = result.rows[1], mode = 'write'},
@@ -1903,7 +1902,7 @@ pgroup.test_select_timeout = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers', nil, {timeout = 1, fullscan = true, mode = 'write'},
     })
 
@@ -1945,7 +1944,7 @@ pgroup.test_opts_not_damaged = function(g)
         fields = fields, mode = 'read', prefer_replica = false,
         balance = false, force_map_call = false,
     }
-    local new_select_opts, err = g.cluster.main_server:eval([[
+    local new_select_opts, err = g.router:eval([[
          local crud = require('crud')
 
          local select_opts = ...
@@ -1988,7 +1987,7 @@ pgroup.test_select_no_map_reduce = function(g)
     local map_reduces_before = helpers.get_map_reduces_stat(router, 'customers')
 
     -- Case: no conditions, just bucket id.
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         nil,
         {bucket_id = 2804, timeout = 1, fullscan = true, mode = 'write'},
@@ -2004,7 +2003,7 @@ pgroup.test_select_no_map_reduce = function(g)
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'==', 'age', 81}},
         {bucket_id = 1161, timeout = 1, mode = 'write'},
@@ -2047,7 +2046,7 @@ pgroup.after_test('test_storage_nil_err_is_processed', function(g)
 end)
 
 pgroup.test_storage_nil_err_is_processed = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers', {{'==', 'age', 101}}
     })
     t.assert_equals(obj, nil)
@@ -2076,7 +2075,7 @@ pgroup.after_test('test_storage_uninit_select_error_text', function(g)
 end)
 
 pgroup.test_storage_uninit_select_error_text = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.select', {
+    local obj, err = g.router:call('crud.select', {
         'customers', {{'==', 'age', 101}}
     })
     t.assert_equals(obj, nil)
@@ -2108,7 +2107,7 @@ pgroup.after_test('test_storage_uninit_get_error_text', function(g)
 end)
 
 pgroup.test_storage_uninit_get_error_text = function(g)
-    local obj, err = g.cluster.main_server.net_box:call('crud.get', {'customers', 1})
+    local obj, err = g.router:call('crud.get', {'customers', 1})
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.str, 'GetError')
     t.assert_str_contains(err.str, 'NotInitialized')
@@ -2236,14 +2235,14 @@ for op, case in pairs(cases) do
 
         opts.yield_every = 1
         reset_yield_counters_on_storages(g)
-        local resp, err = g.cluster.main_server.net_box:eval(case.eval, {'customers', conditions, opts})
+        local resp, err = g.router:eval(case.eval, {'customers', conditions, opts})
         t.assert_equals(err, nil)
         t.assert_equals(#resp.rows, 1000)
         local yield_count_on_each = get_yields_count(g)
 
         opts.yield_every = customers_count * 2
         reset_yield_counters_on_storages(g)
-        local resp, err = g.cluster.main_server.net_box:eval(case.eval, {'customers', conditions, opts})
+        local resp, err = g.router:eval(case.eval, {'customers', conditions, opts})
         t.assert_equals(err, nil)
         t.assert_equals(#resp.rows, 1000)
         local yield_count_none = get_yields_count(g)
@@ -2257,7 +2256,7 @@ for op, case in pairs(cases) do
 end
 
 pgroup.test_select_yield_every_0 = function(g)
-    local resp, err = g.cluster.main_server.net_box:call('crud.select', {
+    local resp, err = g.router:call('crud.select', {
         'customers', nil, {yield_every = 0, fullscan = true, mode = 'write'},
     })
     t.assert_equals(resp, nil)
@@ -2266,7 +2265,7 @@ end
 
 pgroup.test_pairs_yield_every_0 = function(g)
     t.assert_error_msg_contains("yield_every should be > 0", function()
-        g.cluster.main_server.net_box:call('crud.pairs',
+        g.router:call('crud.pairs',
             {'customers', nil, {yield_every = 0, mode = 'write'},
         })
     end)
@@ -2277,7 +2276,7 @@ local function read_impl(cg, space, conditions, opts)
     opts.mode = 'write'
     opts.fullscan = true
 
-    local resp, err = cg.cluster.main_server:call('crud.select', {space, conditions, opts})
+    local resp, err = cg.router:call('crud.select', {space, conditions, opts})
 
     if err ~= nil then
         return nil, err
diff --git a/test/integration/simple_operations_test.lua b/test/integration/simple_operations_test.lua
index 5a419aeb..58f477d0 100644
--- a/test/integration/simple_operations_test.lua
+++ b/test/integration/simple_operations_test.lua
@@ -24,61 +24,61 @@ pgroup.before_each(function(g)
 end)
 
 pgroup.test_non_existent_space = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'non_existent_space', {0, box.NULL, 'Fedor', 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {'non_existent_space', 0})
+    local result, err = g.router:call('crud.get', {'non_existent_space', 0})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- update
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.update', {'non_existent_space', 0, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'non_existent_space', 0})
+    local result, err = g.router:call('crud.delete', {'non_existent_space', 0})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- replace
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'non_existent_space', {0, box.NULL, 'Fedor', 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'non_existent_space', {0, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert', {'non_existent_space', {id = 0, name = 'Fedor', age = 59}, {{'+', 'age', 1}}})
 
     t.assert_equals(result, nil)
@@ -87,7 +87,7 @@ end
 
 pgroup.test_insert_object_get = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 1, name = 'Fedor', age = 59}})
 
     t.assert_equals(err, nil)
@@ -101,7 +101,7 @@ pgroup.test_insert_object_get = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Fedor', age = 59, bucket_id = 477}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {mode = 'write'},
     })
 
@@ -111,14 +111,14 @@ pgroup.test_insert_object_get = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Fedor', age = 59, bucket_id = 477}})
 
     -- insert_object again
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert_object', {'customers', {id = 1, name = 'Alexander', age = 37}})
 
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.err, "Duplicate key exists")
 
     -- bad format
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 2, name = 'Alexander'}})
 
     t.assert_equals(obj, nil)
@@ -127,7 +127,7 @@ end
 
 pgroup.test_insert_get = function(g)
     -- insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
 
     t.assert_equals(err, nil)
@@ -140,7 +140,7 @@ pgroup.test_insert_get = function(g)
     t.assert_equals(result.rows, {{2, 401, 'Ivan', 20}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 2, {mode = 'write'},
     })
 
@@ -149,13 +149,13 @@ pgroup.test_insert_get = function(g)
     t.assert_equals(result.rows, {{2, 401, 'Ivan', 20}})
 
     -- insert again
-    local obj, err = g.cluster.main_server.net_box:call('crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
+    local obj, err = g.router:call('crud.insert', {'customers', {2, box.NULL, 'Ivan', 20}})
 
     t.assert_equals(obj, nil)
     t.assert_str_contains(err.err, "Duplicate key exists")
 
     -- get non-existent
-    local result, err = g.cluster.main_server.net_box:eval([[
+    local result, err = g.router:eval([[
         local crud = require('crud')
         return crud.get('customers', 100, {mode = 'write'})
     ]])
@@ -166,7 +166,7 @@ end
 
 pgroup.test_update = function(g)
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 22, name = 'Leo', age = 72}})
 
     t.assert_equals(err, nil)
@@ -180,7 +180,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo', age = 72, bucket_id = 655}})
 
     -- update age and name fields
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {'customers', 22, {
+    local result, err = g.router:call('crud.update', {'customers', 22, {
             {'+', 'age', 10},
             {'=', 'name', 'Leo Tolstoy'},
     }})
@@ -190,7 +190,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo Tolstoy', age = 82, bucket_id = 655}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 22, {mode = 'write'},
     })
 
@@ -199,14 +199,14 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo Tolstoy', age = 82, bucket_id = 655}})
 
     -- bad key
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.update', {'customers', 'bad-key', {{'+', 'age', 10},}})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Supplied key type of part 0 does not match index part type:")
 
     -- update by field numbers
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {'customers', 22, {
+    local result, err = g.router:call('crud.update', {'customers', 22, {
             {'-', 4, 10},
             {'=', 3, 'Leo'}
     }})
@@ -216,7 +216,7 @@ pgroup.test_update = function(g)
     t.assert_equals(objects, {{id = 22, name = 'Leo', age = 72, bucket_id = 655}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 22, {mode = 'write'},
     })
 
@@ -227,7 +227,7 @@ end
 
 pgroup.test_delete = function(g)
     -- insert tuple
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'customers', {id = 33, name = 'Mayakovsky', age = 36}})
 
     t.assert_equals(err, nil)
@@ -241,7 +241,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(objects, {{id = 33, name = 'Mayakovsky', age = 36, bucket_id = 907}})
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 33})
+    local result, err = g.router:call('crud.delete', {'customers', 33})
 
     t.assert_equals(err, nil)
     if g.params.engine == 'memtx' then
@@ -252,7 +252,7 @@ pgroup.test_delete = function(g)
     end
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 33, {mode = 'write'},
     })
 
@@ -260,7 +260,7 @@ pgroup.test_delete = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- bad key
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {'customers', 'bad-key'})
+    local result, err = g.router:call('crud.delete', {'customers', 'bad-key'})
 
     t.assert_equals(result, nil)
     t.assert_str_contains(err.err, "Supplied key type of part 0 does not match index part type:")
@@ -268,7 +268,7 @@ end
 
 pgroup.test_replace_object = function(g)
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 44, {mode = 'write'},
     })
 
@@ -282,7 +282,7 @@ pgroup.test_replace_object = function(g)
     t.assert_equals(#result.rows, 0)
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers', {id = 44, name = 'John Doe', age = 25}})
 
     t.assert_equals(err, nil)
@@ -290,7 +290,7 @@ pgroup.test_replace_object = function(g)
     t.assert_equals(objects, {{id = 44, name = 'John Doe', age = 25, bucket_id = 2805}})
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace_object', {'customers', {id = 44, name = 'Jane Doe', age = 18}})
 
     t.assert_equals(err, nil)
@@ -299,7 +299,7 @@ pgroup.test_replace_object = function(g)
 end
 
 pgroup.test_replace = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'customers', {45, box.NULL, 'John Fedor', 99}})
 
     t.assert_equals(err, nil)
@@ -312,7 +312,7 @@ pgroup.test_replace = function(g)
     t.assert_equals(result.rows, {{45, 392, 'John Fedor', 99}})
 
     -- replace again
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.replace', {'customers', {45, box.NULL, 'John Fedor', 100}})
 
     t.assert_equals(err, nil)
@@ -321,7 +321,7 @@ end
 
 pgroup.test_upsert_object = function(g)
     -- upsert_object first time
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 66, name = 'Jack Sparrow', age = 25}, {
              {'+', 'age', 25},
              {'=', 'name', 'Leo Tolstoy'},
@@ -337,7 +337,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 66, {mode = 'write'},
     })
 
@@ -346,7 +346,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(objects, {{id = 66, name = 'Jack Sparrow', age = 25, bucket_id = 486}})
 
     -- upsert_object the same query second time when tuple exists
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert_object', {'customers', {id = 66, name = 'Jack Sparrow', age = 25}, {
             {'+', 'age', 25},
             {'=', 'name', 'Leo Tolstoy'},
@@ -356,7 +356,7 @@ pgroup.test_upsert_object = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 66, {mode = 'write'},
     })
 
@@ -367,7 +367,7 @@ end
 
 pgroup.test_upsert = function(g)
     -- upsert tuple first time
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'customers', {67, box.NULL, 'Saltykov-Shchedrin', 63}, {
                           {'=', 'name', 'Mikhail Saltykov-Shchedrin'},
     }})
@@ -382,7 +382,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 67, {mode = 'write'},
     })
 
@@ -390,7 +390,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(result.rows, {{67, 1143, 'Saltykov-Shchedrin', 63}})
 
     -- upsert the same query second time when tuple exists
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
        'crud.upsert', {'customers', {67, box.NULL, 'Saltykov-Shchedrin', 63}, {
                           {'=', 'name', 'Mikhail Saltykov-Shchedrin'}}})
 
@@ -398,7 +398,7 @@ pgroup.test_upsert = function(g)
     t.assert_equals(err, nil)
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 67, {mode = 'write'},
     })
 
@@ -407,7 +407,7 @@ pgroup.test_upsert = function(g)
 end
 
 pgroup.test_intermediate_nullable_fields_update = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert', {'developers', {1, box.NULL}})
     t.assert_equals(err, nil)
 
@@ -425,7 +425,7 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
         end
     end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.update',
+    local result, err = g.router:call('crud.update',
         {'developers', 1, {{'=', 'extra_3', { a = { b = {} } } }}, {fetch_latest_metadata = true}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -445,16 +445,16 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
     -- (https://github.com/tarantool/tarantool/issues/3378).
     -- So before 2.8 update returns an error but after it update is correct.
     if helpers.tarantool_version_at_least(2, 8) then
-        local _, err = g.cluster.main_server.net_box:call('crud.update',
+        local _, err = g.router:call('crud.update',
             {'developers', 1, {{'=', '[5].a.b[1]', 3}, {'=', 'extra_5', 'extra_value_5'}}})
         t.assert_equals(err, nil)
     elseif helpers.tarantool_version_at_least(2, 3) then
-        local _, err = g.cluster.main_server.net_box:call('crud.update',
+        local _, err = g.router:call('crud.update',
             {'developers', 1, {{'=', '[5].a.b[1]', 3}, {'=', 'extra_5', 'extra_value_5'}}})
         t.assert_equals(err.err, "Failed to update: Field ''extra_5'' was not found in the tuple")
     end
 
-    result, err = g.cluster.main_server.net_box:call('crud.update',
+    result, err = g.router:call('crud.update',
         {'developers', 1, {{'=', 5, 'extra_value_3'}, {'=', 7, 'extra_value_5'}}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -470,7 +470,7 @@ pgroup.test_intermediate_nullable_fields_update = function(g)
         }
     })
 
-    result, err = g.cluster.main_server.net_box:call('crud.update',
+    result, err = g.router:call('crud.update',
         {'developers', 1, {
             {'=', 14, 'extra_value_12'},
             {'=', 'extra_9', 'extra_value_9'},
@@ -681,13 +681,13 @@ for case_name, case in pairs(gh_236_cases) do
         local result, err
 
         -- Perform request to fetch initial space format.
-        result, err = g.cluster.main_server.net_box:call(
+        result, err = g.router:call(
             'crud.delete', {'countries', 3})
         t.assert_not_equals(result, nil)
         t.assert_equals(err, nil)
 
         if case.need_pre_insert_data then
-            result, err = g.cluster.main_server.net_box:call(
+            result, err = g.router:call(
                 'crud.insert', {'countries', {3, box.NULL, 'vatican', 825, 'extra_test_data'}})
             t.assert_equals(err, nil)
             t.assert_not_equals(result, nil)
@@ -701,7 +701,7 @@ for case_name, case in pairs(gh_236_cases) do
         end)
 
         if case.operation_name ~= 'crud.pairs' then
-            result, err = g.cluster.main_server.net_box:call(case.operation_name, case.input)
+            result, err = g.router:call(case.operation_name, case.input)
             t.assert_equals(err, nil)
             local found_extra_field = false
             for _, v in pairs(result.metadata) do
@@ -713,7 +713,7 @@ for case_name, case in pairs(gh_236_cases) do
                 string.format('cannot find the expected metadata for case: %s',
                             case.operation_name))
         else
-            local object = g.cluster.main_server.net_box:eval([[
+            local object = g.router:eval([[
                 local objects = {}
                 for _, object in crud.pairs(
                     'countries',
@@ -740,7 +740,7 @@ end
 
 pgroup.test_object_with_nullable_fields = function(g)
     -- Insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
         'crud.insert_object', {'tags', {id = 1, is_green = true}})
     t.assert_equals(err, nil)
 
@@ -766,7 +766,7 @@ pgroup.test_object_with_nullable_fields = function(g)
     -- Update
     -- {1, 477, NULL, true, NULL, NULL, true, NULL, NULL, NULL, NULL, NULL}
     -- Shouldn't failed because of https://github.com/tarantool/tarantool/issues/3378
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
         'crud.update', {'tags', 1, {{'=', 'is_sweet', true}}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -789,7 +789,7 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- Replace
     -- {2, 401, NULL, true, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL}
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
         'crud.replace_object', {'tags', {id = 2, is_green = true}})
     t.assert_equals(err, nil)
     objects = crud.unflatten_rows(result.rows, result.metadata)
@@ -812,7 +812,7 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- Upsert: first is insert then update
     -- {3, 2804, NULL, NULL, NULL, NULL, NULL, true, NULL, NULL, NULL, NULL}
-    local _, err = g.cluster.main_server.net_box:call(
+    local _, err = g.router:call(
         'crud.upsert_object', {'tags', {id = 3, is_dirty = true}, {
              {'=', 'is_dirty', true},
     }})
@@ -820,14 +820,14 @@ pgroup.test_object_with_nullable_fields = function(g)
 
     -- {3, 2804, NULL, NULL, NULL, NULL, NULL, true, NULL, true, true, NULL}
     -- Shouldn't failed because of https://github.com/tarantool/tarantool/issues/3378
-    _, err = g.cluster.main_server.net_box:call(
+    _, err = g.router:call(
         'crud.upsert_object', {'tags', {id = 3, is_dirty = true}, {
              {'=', 'is_useful', true},
     }})
     t.assert_equals(err, nil)
 
     -- Get
-    result, err = g.cluster.main_server.net_box:call('crud.get', {
+    result, err = g.router:call('crud.get', {
         'tags', 3, {mode = 'write'},
     })
     t.assert_equals(err, nil)
@@ -852,7 +852,7 @@ end
 
 pgroup.test_get_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24}
@@ -870,7 +870,7 @@ pgroup.test_get_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 24, bucket_id = 477}})
 
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {fields = {'id', 'name'}, mode = 'write'},
     })
 
@@ -884,7 +884,7 @@ end
 
 pgroup.test_insert_tuple_partial_result = function(g)
     -- insert
-    local result, err = g.cluster.main_server.net_box:call( 'crud.insert', {
+    local result, err = g.router:call( 'crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {fields = {'id', 'name'}}
     })
 
@@ -898,7 +898,7 @@ end
 
 pgroup.test_insert_object_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -916,7 +916,7 @@ end
 
 pgroup.test_delete_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24}
@@ -934,7 +934,7 @@ pgroup.test_delete_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 24, bucket_id = 477}})
 
     -- delete
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.delete', {
                 'customers', 1, {fields = {'id', 'name'}}
             }
@@ -956,7 +956,7 @@ end
 
 pgroup.test_update_partial_result = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 23}
@@ -974,7 +974,7 @@ pgroup.test_update_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, name = 'Elizabeth', age = 23, bucket_id = 477}})
 
     -- update
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},},  {fields = {'id', 'age'}}
     })
 
@@ -987,7 +987,7 @@ pgroup.test_update_partial_result = function(g)
 end
 
 pgroup.test_replace_tuple_partial_result = function(g)
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 23},
@@ -1003,7 +1003,7 @@ pgroup.test_replace_tuple_partial_result = function(g)
     t.assert_equals(result.rows, {{1, 23}})
 
     -- replace again
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 24},
@@ -1021,7 +1021,7 @@ end
 
 pgroup.test_replace_object_partial_result = function(g)
     -- get
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'customers', 1, {mode = 'write'},
     })
 
@@ -1035,7 +1035,7 @@ pgroup.test_replace_object_partial_result = function(g)
     })
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 23},
@@ -1052,7 +1052,7 @@ pgroup.test_replace_object_partial_result = function(g)
     t.assert_equals(objects, {{id = 1, age = 23}})
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1071,7 +1071,7 @@ end
 
 pgroup.test_upsert_tuple_partial_result = function(g)
     -- upsert tuple first time
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 23},
         {{'+', 'age', 1},},
@@ -1086,7 +1086,7 @@ pgroup.test_upsert_tuple_partial_result = function(g)
     })
 
     -- upsert second time
-    result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 23},
         {{'+', 'age', 1},},
@@ -1103,7 +1103,7 @@ end
 
 pgroup.test_upsert_object_partial_result = function(g)
     -- upsert_object first time
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
             'customers',
             {id = 1, name = 'Elizabeth', age = 23},
             {{'+', 'age', 1},},
@@ -1118,7 +1118,7 @@ pgroup.test_upsert_object_partial_result = function(g)
     })
 
     -- upsert_object second time
-    result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    result, err = g.router:call('crud.upsert_object', {
         'customers',
         {id = 1, name = 'Elizabeth', age = 23},
         {{'+', 'age', 1},},
@@ -1135,7 +1135,7 @@ end
 
 pgroup.test_partial_result_with_nullable_fields = function(g)
     -- Insert
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {'tags', {id = 1, is_green = true}})
     t.assert_equals(err, nil)
 
@@ -1158,7 +1158,7 @@ pgroup.test_partial_result_with_nullable_fields = function(g)
         }
     })
 
-    local result, err = g.cluster.main_server.net_box:call('crud.get', {
+    local result, err = g.router:call('crud.get', {
         'tags', 1, {fields = {'id', 'is_sweet', 'is_green'}, mode = 'write'},
     })
 
@@ -1174,7 +1174,7 @@ end
 
 pgroup.test_partial_result_bad_input = function(g)
     -- insert_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.insert_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1186,7 +1186,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- get
-    result, err = g.cluster.main_server.net_box:call('crud.get', {
+    result, err = g.router:call('crud.get', {
         'customers', 1, {fields = {'id', 'lastname', 'name'}, mode = 'write'},
     })
 
@@ -1194,7 +1194,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- update
-    result, err = g.cluster.main_server.net_box:call('crud.update', {
+    result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},},
         {fields = {'id', 'lastname', 'age'}}
     })
@@ -1203,7 +1203,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- delete
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
             'crud.delete', {
                 'customers', 1,
                 {fields = {'id', 'lastname', 'name'}}
@@ -1214,7 +1214,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- replace
-    result, err = g.cluster.main_server.net_box:call(
+    result, err = g.router:call(
             'crud.replace', {
                 'customers',
                 {1, box.NULL, 'Elizabeth', 23},
@@ -1226,7 +1226,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- replace_object
-    local result, err = g.cluster.main_server.net_box:call(
+    local result, err = g.router:call(
             'crud.replace_object', {
                 'customers',
                 {id = 1, name = 'Elizabeth', age = 24},
@@ -1238,7 +1238,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- upsert
-    result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    result, err = g.router:call('crud.upsert', {
         'customers',
         {1, box.NULL, 'Elizabeth', 24},
         {{'+', 'age', 1},},
@@ -1249,7 +1249,7 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 
     -- upsert_object
-    result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    result, err = g.router:call('crud.upsert_object', {
         'customers',
         {id = 1, name = 'Elizabeth', age = 24},
         {{'+', 'age', 1},},
@@ -1263,7 +1263,7 @@ end
 pgroup.test_tuple_not_damaged = function(g)
     -- insert
     local insert_tuple = {22, box.NULL, 'Elizabeth', 24}
-    local new_insert_tuple, err = g.cluster.main_server:eval([[
+    local new_insert_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_tuple = ...
@@ -1278,7 +1278,7 @@ pgroup.test_tuple_not_damaged = function(g)
 
     -- upsert
     local upsert_tuple = {33, box.NULL, 'Peter', 35}
-    local new_upsert_tuple, err = g.cluster.main_server:eval([[
+    local new_upsert_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_tuple = ...
@@ -1293,7 +1293,7 @@ pgroup.test_tuple_not_damaged = function(g)
 
     -- replace
     local replace_tuple = {22, box.NULL, 'Elizabeth', 24}
-    local new_replace_tuple, err = g.cluster.main_server:eval([[
+    local new_replace_tuple, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_tuple = ...
@@ -1310,7 +1310,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- insert
     local insert_opts = {timeout = 1, bucket_id = 655, fields = {'name', 'age'}}
-    local new_insert_opts, err = g.cluster.main_server:eval([[
+    local new_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_opts = ...
@@ -1325,7 +1325,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- insert_object
     local insert_opts = {timeout = 1, bucket_id = 477, fields = {'name', 'age'}}
-    local new_insert_opts, err = g.cluster.main_server:eval([[
+    local new_insert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local insert_opts = ...
@@ -1340,7 +1340,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert
     local upsert_opts = {timeout = 1, bucket_id = 907, fields = {'name', 'age'}}
-    local new_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_opts = ...
@@ -1355,7 +1355,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert_object
     local upsert_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local upsert_opts = ...
@@ -1372,7 +1372,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- get
     local get_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_get_opts, err = g.cluster.main_server:eval([[
+    local new_get_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local get_opts = ...
@@ -1387,7 +1387,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- update
     local update_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_update_opts, err = g.cluster.main_server:eval([[
+    local new_update_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local update_opts = ...
@@ -1402,7 +1402,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace
     local replace_opts = {timeout = 1, bucket_id = 655, fields = {'name', 'age'}}
-    local new_replace_opts, err = g.cluster.main_server:eval([[
+    local new_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_opts = ...
@@ -1417,7 +1417,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- replace_object
     local replace_opts = {timeout = 1, bucket_id = 477, fields = {'name', 'age'}}
-    local new_replace_opts, err = g.cluster.main_server:eval([[
+    local new_replace_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local replace_opts = ...
@@ -1432,7 +1432,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- delete
     local delete_opts = {timeout = 1, bucket_id = 401, fields = {'name', 'age'}}
-    local new_delete_opts, err = g.cluster.main_server:eval([[
+    local new_delete_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local delete_opts = ...
@@ -1521,7 +1521,7 @@ for op, case in pairs(gh_328_success_cases) do
     local test_name = ('test_gh_328_%s_with_sequence'):format(op)
 
     pgroup[test_name] = function(g)
-        local result, err = g.cluster.main_server.net_box:call('crud.' .. op, case.args)
+        local result, err = g.router:call('crud.' .. op, case.args)
         t.assert_equals(err, nil)
         t.assert_equals(#result.rows, 1)
 
@@ -1568,7 +1568,7 @@ for op, case in pairs(gh_328_error_cases) do
     local test_name = ('test_gh_328_%s_with_sequence_returns_error_without_option'):format(op)
 
     pgroup[test_name] = function(g)
-        local result, err = g.cluster.main_server.net_box:call('crud.' .. op, case.args)
+        local result, err = g.router:call('crud.' .. op, case.args)
         t.assert_equals(result, nil)
 
         if case.many then
@@ -1590,63 +1590,63 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- insert with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.insert', {
+    local result, err = g.router:call('crud.insert', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- insert_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.insert_object', {
+    local result, err = g.router:call('crud.insert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', {1, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.replace', {
+    local result, err = g.router:call('crud.replace', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', {id = 0, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- replace_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.replace_object', {
+    local result, err = g.router:call('crud.replace_object', {
         'customers', {id = box.NULL, name = 'Fedor', age = 59}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- upsert with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', {1, box.NULL, 'Alice', 22},
         {{'+', 'age', 1}}, {noreturn = true}
     })
@@ -1654,7 +1654,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert', {
+    local result, err = g.router:call('crud.upsert', {
         'customers', {1, box.NULL, 'Alice', 22},
         {{'+', 'unknown', 1}}, {noreturn = true}
     })
@@ -1662,7 +1662,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59},
         {{'+', 'age', 1}}, {noreturn = true}
     })
@@ -1670,7 +1670,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.upsert_object', {
+    local result, err = g.router:call('crud.upsert_object', {
         'customers', {id = 0, name = 'Fedor', age = 59},
         {{'+', 'unknown', 1}}, {noreturn = true}
     })
@@ -1678,28 +1678,28 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- update with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', 1, {{'+', 'age', 1},}, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- update with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.update', {
+    local result, err = g.router:call('crud.update', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- delete with noreturn success
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', 1, {noreturn = true}
     })
     t.assert_equals(err, nil)
     t.assert_equals(result, nil)
 
     -- delete with noreturn fail
-    local result, err = g.cluster.main_server.net_box:call('crud.delete', {
+    local result, err = g.router:call('crud.delete', {
         'customers', {box.NULL, box.NULL, 'Elizabeth', 24}, {noreturn = true}
     })
     t.assert_not_equals(err, nil)
diff --git a/test/integration/stats_test.lua b/test/integration/stats_test.lua
index 222be1fd..bf7576da 100644
--- a/test/integration/stats_test.lua
+++ b/test/integration/stats_test.lua
@@ -35,7 +35,6 @@ local new_space_name = 'newspace'
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_stats')
 
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
     if g.params.args.driver == 'metrics' then
         local is_metrics_supported = g.router:eval([[
             return require('crud.stats.metrics_registry').is_supported()
@@ -58,7 +57,7 @@ local call_cfg = function(g, way, cfg)
             require('crud').cfg(...)
         ]], { cfg })
     elseif way == 'role' then
-        g.cluster.main_server:upload_config{crud = cfg}
+        g.router:upload_config{crud = cfg}
     end
 end
 
@@ -876,7 +875,7 @@ pgroup.test_role_reload_do_not_reset_observations = function(g)
 
     local stats_before = get_stats(g)
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
 
     local stats_after = get_stats(g)
     t.assert_equals(stats_after, stats_before)
@@ -892,7 +891,7 @@ pgroup.test_module_reload_do_not_reset_observations = function(g)
 
     local stats_before = get_stats(g)
 
-    helpers.reload_package(g.cluster:server('router'))
+    helpers.reload_package(g.router)
 
     local stats_after = get_stats(g)
     t.assert_equals(stats_after, stats_before)
@@ -1192,7 +1191,7 @@ group_metrics.test_role_reload_do_not_reset_metrics_observations = function(g)
         "See https://github.com/tarantool/metrics/issues/334")
     helpers.skip_old_tarantool_cartridge_hotreload()
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
     g.router:eval("crud = require('crud')")
     local metrics = get_metrics(g)
     validate_metrics(g, metrics)
@@ -1233,7 +1232,7 @@ group_metrics.test_stats_changed_in_metrics_registry_after_role_reload = functio
         "Cartridge roles reload is not supported")
     helpers.skip_old_tarantool_cartridge_hotreload()
 
-    helpers.reload_roles(g.cluster:server('router'))
+    helpers.reload_roles(g.router)
     g.router:eval("crud = require('crud')")
     check_updated_per_call(g)
 end
diff --git a/test/integration/storages_state_test.lua b/test/integration/storages_state_test.lua
index 9b7f348a..fc9baf58 100644
--- a/test/integration/storages_state_test.lua
+++ b/test/integration/storages_state_test.lua
@@ -16,7 +16,7 @@ local function wait_storages_init(g)
     local attempts_left = 5
     local wait_for_init_timeout = 1
     while (attempts_left > 0 and not storages_initialized) do
-        local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+        local results, err = g.router:call("crud.storage_info", {})
         t.assert_equals(err, nil, "Error getting storage status")
         storages_initialized = true
         local count = 0
@@ -84,7 +84,7 @@ end
 pgroup.test_crud_storage_status_of_stopped_servers = function(g)
     g.cluster:server("s2-replica"):stop()
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
 
     t.assert_equals(results, build_storage_info(g, {
@@ -127,7 +127,7 @@ pgroup.test_disabled_storage_role = function(g)
 
     t.assert_not_equals(results, nil, "Failed to disable storage role")
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
 
     t.assert_equals(results, build_storage_info(g, {
@@ -169,7 +169,7 @@ pgroup.test_storage_call_failure = function(g)
 
     t.assert_not_equals(results, nil, "Eval failed")
 
-    local results, err = g.cluster.main_server.net_box:call("crud.storage_info", {})
+    local results, err = g.router:call("crud.storage_info", {})
     t.assert_equals(err, nil, "Error getting storages info")
     t.assert_equals(results, build_storage_info(g, {
         {
diff --git a/test/integration/truncate_test.lua b/test/integration/truncate_test.lua
index 3d5dcc18..be76bd51 100644
--- a/test/integration/truncate_test.lua
+++ b/test/integration/truncate_test.lua
@@ -24,7 +24,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- insert
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.truncate', {'non_existent_space'}
     )
 
@@ -51,7 +51,7 @@ pgroup.test_truncate = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         nil,
         {fullscan = true, mode = 'write'},
@@ -59,11 +59,11 @@ pgroup.test_truncate = function(g)
     t.assert_equals(err, nil)
     t.assert_gt(#result.rows, 0)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.truncate', {'customers'})
+    local result, err = g.router:call('crud.truncate', {'customers'})
     t.assert_equals(err, nil)
     t.assert_equals(result, true)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         nil,
         {fullscan = true, mode = 'write'},
@@ -74,7 +74,7 @@ end
 
 pgroup.test_opts_not_damaged = function(g)
     local truncate_opts = {timeout = 1}
-    local new_truncate_opts, err = g.cluster.main_server:eval([[
+    local new_truncate_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local truncate_opts = ...
diff --git a/test/integration/updated_schema_test.lua b/test/integration/updated_schema_test.lua
index 775a1dca..0b463e5f 100644
--- a/test/integration/updated_schema_test.lua
+++ b/test/integration/updated_schema_test.lua
@@ -22,7 +22,7 @@ end)
 pgroup.before_each(function(g)
     helpers.drop_space_on_cluster(g.cluster, 'customers')
     -- force schema update on router
-    g.cluster.main_server.net_box:eval([[
+    g.router:eval([[
         local vshard = require('vshard')
         for _, replicaset in pairs(vshard.router.routeall()) do
             if replicaset.locate_master ~= nil then
@@ -44,7 +44,7 @@ end)
 
 pgroup.test_insert_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -59,7 +59,7 @@ pgroup.test_insert_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -69,7 +69,7 @@ end
 
 pgroup.test_insert_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -84,7 +84,7 @@ pgroup.test_insert_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -94,7 +94,7 @@ end
 
 pgroup.test_get_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.get', {'customers', 1}
     )
 
@@ -109,7 +109,7 @@ pgroup.test_get_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.get', {'customers', 1}
     )
 
@@ -119,7 +119,7 @@ end
 
 pgroup.test_delete_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.delete', {'customers', 11}
     )
 
@@ -134,7 +134,7 @@ pgroup.test_delete_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.delete', {'customers', 11}
     )
 
@@ -144,7 +144,7 @@ end
 
 pgroup.test_update_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.update', {'customers', 11, {{'=', 'value', 'YYY'}}}
     )
 
@@ -159,14 +159,14 @@ pgroup.test_update_non_existent_space = function(g)
     end)
 
     -- insert tuple
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
     t.assert_is_not(obj, nil)
     t.assert_equals(err, nil)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.update', {'customers', 11, {{'=', 'value', 'YYY'}}}
     )
 
@@ -176,7 +176,7 @@ end
 
 pgroup.test_replace_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -191,7 +191,7 @@ pgroup.test_replace_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -201,7 +201,7 @@ end
 
 pgroup.test_replace_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -216,7 +216,7 @@ pgroup.test_replace_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 'XXX'}}
     )
 
@@ -226,7 +226,7 @@ end
 
 pgroup.test_upsert_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -241,7 +241,7 @@ pgroup.test_upsert_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -251,7 +251,7 @@ end
 
 pgroup.test_upsert_object_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -266,7 +266,7 @@ pgroup.test_upsert_object_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -276,7 +276,7 @@ end
 
 pgroup.test_select_non_existent_space = function(g)
     -- non-existent space err
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', nil, {fullscan = true}}
     )
 
@@ -291,7 +291,7 @@ pgroup.test_select_non_existent_space = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', nil, {fullscan = true}}
     )
 
@@ -302,7 +302,7 @@ end
 pgroup.test_borders_non_existent_space = function(g)
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- non-existent space err
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             border_func_name, {'customers'}
         )
 
@@ -319,7 +319,7 @@ pgroup.test_borders_non_existent_space = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- check that schema changes were applied
-        local obj, err = g.cluster.main_server.net_box:call(
+        local obj, err = g.router:call(
             border_func_name, {'customers'}
         )
 
@@ -335,7 +335,7 @@ pgroup.test_insert_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -349,7 +349,7 @@ pgroup.test_insert_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -364,7 +364,7 @@ pgroup.test_replace_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -378,7 +378,7 @@ pgroup.test_replace_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 'XXX'}}
     )
 
@@ -393,7 +393,7 @@ pgroup.test_upsert_no_bucket_id_index = function(g)
     end)
 
     -- no bucket ID index error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -407,7 +407,7 @@ pgroup.test_upsert_no_bucket_id_index = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'value', 'YYY'}}}
     )
 
@@ -423,7 +423,7 @@ pgroup.test_insert_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 123}}
     )
 
@@ -438,7 +438,7 @@ pgroup.test_insert_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert', {'customers', {11, nil, 123}}
     )
 
@@ -454,7 +454,7 @@ pgroup.test_replace_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 123}}
     )
 
@@ -469,7 +469,7 @@ pgroup.test_replace_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace', {'customers', {11, nil, 123}}
     )
 
@@ -485,7 +485,7 @@ pgroup.test_upsert_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 123}, {{'=', 'value', 456}}}
     )
 
@@ -500,7 +500,7 @@ pgroup.test_upsert_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 123}, {{'=', 'value', 456}}}
     )
 
@@ -515,14 +515,14 @@ pgroup.test_update_field_added = function(g)
         server.net_box:call('create_bucket_id_index')
     end)
 
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert', {'customers', {11, nil, 'XXX'}}
     )
     t.assert_is_not(obj, nil)
     t.assert_equals(err, nil)
 
     -- unknown field error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.update', {'customers', 11, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -541,7 +541,7 @@ pgroup.test_update_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.update', {'customers', 11, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -557,7 +557,7 @@ pgroup.test_upsert_field_added = function(g)
     end)
 
     -- unknown field error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -576,7 +576,7 @@ pgroup.test_upsert_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert', {'customers', {11, nil, 'XXX'}, {{'=', 'extra', 'EXTRRRRA'}}}
     )
 
@@ -592,7 +592,7 @@ pgroup.test_select_field_added = function(g)
     end)
 
     -- unknown field (no results)
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', {{'==', 'extra', 'EXTRRRRA'}}, {fullscan = true}}
     )
 
@@ -605,7 +605,7 @@ pgroup.test_select_field_added = function(g)
     end)
 
     -- check that schema changes were applied
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.select', {'customers', {{'==', 'extra', 'EXTRRRRA'}}, {fullscan = true}}
     )
 
@@ -621,7 +621,7 @@ pgroup.test_insert_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.insert_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -636,7 +636,7 @@ pgroup.test_insert_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.insert_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -652,7 +652,7 @@ pgroup.test_replace_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.replace_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -667,7 +667,7 @@ pgroup.test_replace_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
        'crud.replace_object', {'customers', {id = 11, value = 123}}
     )
 
@@ -683,7 +683,7 @@ pgroup.test_upsert_object_field_type_changed = function(g)
     end)
 
     -- value should be string error
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 123}, {}}
     )
 
@@ -698,7 +698,7 @@ pgroup.test_upsert_object_field_type_changed = function(g)
 
     -- check that schema changes were applied
     -- insert value unsigned - OK
-    local obj, err = g.cluster.main_server.net_box:call(
+    local obj, err = g.router:call(
         'crud.upsert_object', {'customers', {id = 11, value = 123}, {}}
     )
 
@@ -715,7 +715,7 @@ pgroup.test_borders_value_index_added = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- non-existent space err
-        local obj, err = g.cluster.main_server.net_box:call(border_func_name, {
+        local obj, err = g.router:call(border_func_name, {
             'customers',
             'value_index',
             {mode = 'write'},
@@ -733,7 +733,7 @@ pgroup.test_borders_value_index_added = function(g)
 
     for _, border_func_name in ipairs({'crud.max', 'crud.min'}) do
         -- check that schema changes were applied
-        local obj, err = g.cluster.main_server.net_box:call(border_func_name, {
+        local obj, err = g.router:call(border_func_name, {
             'customers',
             'value_index',
             {mode = 'write'},
@@ -754,13 +754,13 @@ pgroup.test_alter_index_parts = function(g)
 
     for i = 0, 9 do
         -- Insert {0, 9}, {1, 8}, ..., {9, 0} paris in index
-        local _, err = g.cluster.main_server.net_box:call(
+        local _, err = g.router:call(
                 'crud.replace', {'customers', {i, nil, tostring(i), 9 - i}})
         t.assert_equals(err, nil)
     end
 
     -- Check sort order before alter
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'>=', 'number_value_index', {0, "0"}}},
         {fullscan = true, mode = 'write'},
@@ -783,7 +783,7 @@ pgroup.test_alter_index_parts = function(g)
     fiber.sleep(1)
 
     -- Sort order should be new
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = g.router:call('crud.select', {
         'customers',
         {{'>=', 'number_value_index', {"0", 0}}},
         {fullscan = true, mode = 'write'},
diff --git a/test/integration/upsert_many_test.lua b/test/integration/upsert_many_test.lua
index 4e938954..9bf8113f 100644
--- a/test/integration/upsert_many_test.lua
+++ b/test/integration/upsert_many_test.lua
@@ -23,7 +23,7 @@ end)
 
 pgroup.test_non_existent_space = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'non_existent_space',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -38,7 +38,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(errs[1].err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'non_existent_space',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -57,7 +57,7 @@ pgroup.test_non_existent_space = function(g)
     t.assert_str_contains(errs[3].err, 'Space "non_existent_space" doesn\'t exist')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'non_existent_space',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -79,7 +79,7 @@ end
 
 pgroup.test_object_bad_format = function(g)
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 12}}},
@@ -107,7 +107,7 @@ pgroup.test_object_bad_format = function(g)
     t.assert_equals(result, {1, 477, 'Fedor', 59})
 
     -- bad format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', '1'}}},
@@ -133,7 +133,7 @@ pgroup.test_object_bad_format = function(g)
 
     -- bad format
     -- two errors, default: stop_on_error == false
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Anna'}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -154,7 +154,7 @@ end
 
 pgroup.test_all_success = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -191,7 +191,7 @@ end
 
 pgroup.test_object_all_success = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -239,7 +239,7 @@ pgroup.test_one_error = function(g)
 
     -- upsert_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 'Peter'},}},
@@ -294,7 +294,7 @@ pgroup.test_object_one_error = function(g)
 
     -- upsert_object_many
     -- failed for s1-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 'Peter'},}},
@@ -349,7 +349,7 @@ pgroup.test_many_errors = function(g)
 
     -- upsert_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 'Peter'},}},
@@ -417,7 +417,7 @@ pgroup.test_object_many_errors = function(g)
 
     -- upsert_object_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 'Peter'},}},
@@ -490,7 +490,7 @@ pgroup.test_no_success = function(g)
 
     -- upsert_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'=', 'name', 5},}},
@@ -563,7 +563,7 @@ pgroup.test_object_no_success = function(g)
 
     -- upsert_object_many
     -- failed for both: s1-master s2-master
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'=', 'name', 5},}},
@@ -621,7 +621,7 @@ end
 pgroup.test_object_bad_format_stop_on_error = function(g)
     -- bad format
     -- two errors, stop_on_error == true
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor'}, {{'+', 'age', 12}}},
@@ -641,7 +641,7 @@ end
 
 pgroup.test_all_success_stop_on_error = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -681,7 +681,7 @@ end
 
 pgroup.test_object_all_success_stop_on_error = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -735,7 +735,7 @@ pgroup.test_object_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -816,7 +816,7 @@ pgroup.test_partial_success_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = false
     -- one error on one storage without rollback, inserts stop by error on this storage
     -- inserts before error are successful
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'+', 'age', 1}}},
@@ -901,7 +901,7 @@ pgroup.test_no_success_stop_on_error = function(g)
     -- upsert_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{2, box.NULL, 'Alex', 34}, {{'+', 'age', '1'}}},
@@ -994,7 +994,7 @@ pgroup.test_object_no_success_stop_on_error = function(g)
     -- upsert_object_many
     -- fails for both: s1-master s2-master
     -- one error on each storage, all inserts stop by error
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Alex', age = 34}, {{'+', 'age', '1'}}},
@@ -1069,7 +1069,7 @@ end
 
 pgroup.test_all_success_rollback_on_error = function(g)
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -1109,7 +1109,7 @@ end
 
 pgroup.test_object_all_success_rollback_on_error = function(g)
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 25}, {'=', 'name', 'Leo Tolstoy'},}},
@@ -1167,7 +1167,7 @@ pgroup.test_object_partial_success_rollback_on_error = function(g)
     -- upsert_object_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -1262,7 +1262,7 @@ pgroup.test_partial_success_rollback_on_error = function(g)
     -- upsert_many
     -- stop_on_error = false, rollback_on_error = true
     -- two error on one storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Peter', 24}, {{'+', 'age', 1}}},
@@ -1362,7 +1362,7 @@ pgroup.test_no_success_rollback_on_error = function(g)
     -- upsert_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Olga', 27}, {{'+', 'age', 1}}},
@@ -1481,7 +1481,7 @@ pgroup.test_object_no_success_rollback_on_error = function(g)
     -- upsert_object_many
     -- fails for both: s1-master s2-master
     -- two errors on each storage with rollback
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Olga', age = 27}, {{'+', 'age', 1}}},
@@ -1578,7 +1578,7 @@ end
 pgroup.test_all_success_rollback_and_stop_on_error = function(g)
     -- upsert_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{2, box.NULL, 'Anna', 23}, {{'+', 'age', 1}}},
@@ -1620,7 +1620,7 @@ end
 pgroup.test_object_all_success_rollback_and_stop_on_error = function(g)
     -- upsert_object_many
     -- all success
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 2, name = 'Anna', age = 23}, {{'+', 'age', 1}}},
@@ -1675,7 +1675,7 @@ pgroup.test_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{22, box.NULL, 'Alex', 34}, {{'+', 'age', 1}}},
@@ -1770,7 +1770,7 @@ pgroup.test_object_partial_success_rollback_and_stop_on_error = function(g)
     -- stop_on_error = true, rollback_on_error = true
     -- two error on one storage with rollback, inserts stop by error on this storage
     -- inserts before error are rollbacked
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 22, name = 'Alex', age = 34}, {{'+', 'age', 1}}},
@@ -1851,7 +1851,7 @@ end
 
 pgroup.test_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{15, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}},
@@ -1866,7 +1866,7 @@ pgroup.test_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- upsert_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Fedor', 59}, {{'+', 'age', 1}}},
@@ -1886,7 +1886,7 @@ end
 
 pgroup.test_object_partial_result = function(g)
     -- bad fields format
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 15, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -1901,7 +1901,7 @@ pgroup.test_object_partial_result = function(g)
     t.assert_str_contains(errs[1].err, 'Space format doesn\'t contain field named "invalid"')
 
     -- upsert_object_many
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -1922,7 +1922,7 @@ end
 pgroup.test_opts_not_damaged = function(g)
     -- upsert_many
     local batch_upsert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_upsert_opts = ...
@@ -1939,7 +1939,7 @@ pgroup.test_opts_not_damaged = function(g)
 
     -- upsert_object_many
     local batch_upsert_opts = {timeout = 1, fields = {'name', 'age'}}
-    local new_batch_upsert_opts, err = g.cluster.main_server:eval([[
+    local new_batch_upsert_opts, err = g.router:eval([[
         local crud = require('crud')
 
         local batch_upsert_opts = ...
@@ -1957,7 +1957,7 @@ end
 
 pgroup.test_noreturn_opt = function(g)
     -- upsert_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -1971,7 +1971,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{1, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -1986,7 +1986,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_many', {
+    local result, errs = g.router:call('crud.upsert_many', {
         'customers',
         {
             {{box.NULL, box.NULL, 'Alex', 59}, {{'+', 'age', 1}}},
@@ -2001,7 +2001,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, all tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2015,7 +2015,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, some tuples are correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = 1, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2030,7 +2030,7 @@ pgroup.test_noreturn_opt = function(g)
     t.assert_equals(result, nil)
 
     -- upsert_object_many with noreturn, all tuples are not correct
-    local result, errs = g.cluster.main_server.net_box:call('crud.upsert_object_many', {
+    local result, errs = g.router:call('crud.upsert_object_many', {
         'customers',
         {
             {{id = box.NULL, name = 'Fedor', age = 59}, {{'+', 'age', 1}}},
@@ -2046,7 +2046,7 @@ pgroup.test_noreturn_opt = function(g)
 end
 
 pgroup.test_zero_tuples = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.upsert_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
@@ -2056,7 +2056,7 @@ pgroup.test_zero_tuples = function(g)
 end
 
 pgroup.test_zero_objects = function(g)
-    local result, errs = g.cluster.main_server.net_box:call(
+    local result, errs = g.router:call(
         'crud.upsert_object_many', {'customers', {}})
 
     t.assert_not_equals(errs, nil)
diff --git a/test/integration/vshard_custom_test.lua b/test/integration/vshard_custom_test.lua
index 2e164a0c..56dd5fbf 100644
--- a/test/integration/vshard_custom_test.lua
+++ b/test/integration/vshard_custom_test.lua
@@ -85,7 +85,8 @@ pgroup.before_all(function(g)
     })
 
     g.cluster:start()
-    g.router = g.cluster:server('router').net_box
+
+    g.router = g.cluster:server('router')
 end)
 
 pgroup.after_all(function(g) helpers.stop_cartridge_cluster(g.cluster) end)
diff --git a/test/performance/perf_test.lua b/test/performance/perf_test.lua
index 975cf12f..05185122 100644
--- a/test/performance/perf_test.lua
+++ b/test/performance/perf_test.lua
@@ -109,8 +109,6 @@ g.before_all(function(g)
 
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
 
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
-
     g.router:eval([[
         rawset(_G, 'crud', require('crud'))
     ]])
@@ -1152,7 +1150,7 @@ for name, case in pairs(cases) do
 
             local connections = {}
 
-            local router = helpers.get_router(g.cluster, g.params.backend)
+            local router = g.router
             for _ = 1, params.connection_count do
                 local c = net_box:connect(router.net_box_uri, router.net_box_credentials)
                 if c == nil then
diff --git a/test/unit/call_test.lua b/test/unit/call_test.lua
index f07cbcd4..3332381f 100644
--- a/test/unit/call_test.lua
+++ b/test/unit/call_test.lua
@@ -68,16 +68,16 @@ pgroup.before_all(function(g)
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
 
     g.clear_vshard_calls = function()
-        g.cluster.main_server.net_box:call('clear_vshard_calls')
+        g.router:call('clear_vshard_calls')
     end
 
     g.get_vshard_calls = function()
-        return g.cluster.main_server.net_box:eval('return _G.vshard_calls')
+        return g.router:eval('return _G.vshard_calls')
     end
 
     -- patch vshard.router.call* functions
     local vshard_call_names = {'callro', 'callbro', 'callre', 'callbre', 'callrw'}
-    g.cluster.main_server.net_box:call('patch_vshard_calls', {vshard_call_names})
+    g.router:call('patch_vshard_calls', {vshard_call_names})
 end)
 
 pgroup.after_all(function(g)
@@ -85,7 +85,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_map_non_existent_func = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -98,7 +98,7 @@ pgroup.test_map_non_existent_func = function(g)
 end
 
 pgroup.test_single_non_existent_func = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -111,7 +111,7 @@ pgroup.test_single_non_existent_func = function(g)
 end
 
 pgroup.test_map_invalid_mode = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -123,7 +123,7 @@ pgroup.test_map_invalid_mode = function(g)
 end
 
 pgroup.test_single_invalid_mode = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -135,7 +135,7 @@ pgroup.test_single_invalid_mode = function(g)
 end
 
 pgroup.test_map_no_args = function(g)
-    local results_map, err  = g.cluster.main_server.net_box:eval([[
+    local results_map, err  = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -149,7 +149,7 @@ pgroup.test_map_no_args = function(g)
 end
 
 pgroup.test_args = function(g)
-    local results_map, err = g.cluster.main_server.net_box:eval([[
+    local results_map, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -165,7 +165,7 @@ end
 pgroup.test_timeout = function(g)
     local timeout = 0.2
 
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -184,7 +184,7 @@ end
 
 local function check_single_vshard_call(g, exp_vshard_call, opts)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -198,7 +198,7 @@ end
 
 local function check_map_vshard_call(g, exp_vshard_call, opts)
     g.clear_vshard_calls()
-    local _, err = g.cluster.main_server.net_box:eval([[
+    local _, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -290,7 +290,7 @@ end
 
 pgroup.test_any_vshard_call = function(g)
     g.clear_vshard_calls()
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
@@ -304,7 +304,7 @@ end
 pgroup.test_any_vshard_call_timeout = function(g)
     local timeout = 0.2
 
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local vshard = require('vshard')
         local call = require('crud.common.call')
 
diff --git a/test/unit/not_initialized_test.lua b/test/unit/not_initialized_test.lua
index 84e5c782..e204bd25 100644
--- a/test/unit/not_initialized_test.lua
+++ b/test/unit/not_initialized_test.lua
@@ -47,6 +47,8 @@ local cartridge_cfg_template = {
 
 pgroup.before_all(function(g)
     helpers.start_cluster(g, cartridge_cfg_template, vshard_cfg_template)
+
+    g.router = g.cluster:server('router')
 end)
 
 pgroup.after_all(function(g)
@@ -54,7 +56,7 @@ pgroup.after_all(function(g)
 end)
 
 pgroup.test_insert = function(g)
-    local results, err = g.cluster.main_server.net_box:eval([[
+    local results, err = g.router:eval([[
         local crud = require('crud')
         return crud.insert('customers', {id = 1, name = 'Fedor', age = 15})
     ]])
diff --git a/test/unit/stats_test.lua b/test/unit/stats_test.lua
index 4681ccf3..fdaf8c01 100644
--- a/test/unit/stats_test.lua
+++ b/test/unit/stats_test.lua
@@ -18,7 +18,6 @@ local space_name = 'customers'
 
 local function before_all(g)
     helpers.start_default_cluster(g, 'srv_stats')
-    g.router = helpers.get_router(g.cluster, g.params.backend).net_box
 
     helpers.prepare_simple_functions(g.router)
     g.router:eval("stats_module = require('crud.stats')")
diff --git a/test/vshard_helpers/vtest.lua b/test/vshard_helpers/vtest.lua
index 7cc89ac7..70236b97 100644
--- a/test/vshard_helpers/vtest.lua
+++ b/test/vshard_helpers/vtest.lua
@@ -214,13 +214,13 @@ local function router_new(g, name, cfg)
 end
 
 --
--- Start a main_server router.
+-- Start a router.
 --
-local function start_main_server(g, cfg, opts)
+local function start_router(g, cfg, opts)
     local cfg = table.deepcopy(cfg)
     cfg.engine = nil
 
-    local router = router_new(g, 'main_server', cfg)
+    local router = router_new(g, 'router', cfg)
     if opts.router_init ~= nil then
         router:exec(function(router_init)
             require(router_init)()
@@ -551,7 +551,7 @@ local function cluster_new(g, cfg)
         end
     end
 
-    start_main_server(g, cfg, {
+    start_router(g, cfg, {
         router_init = router_init,
         all_init = all_init,
         crud_init = crud_init,