diff --git a/tests/topotests/ospf_multi_instance/r1/frr.conf b/tests/topotests/ospf_multi_instance/r1/frr.conf
new file mode 100644
index 000000000000..c341a7176a09
--- /dev/null
+++ b/tests/topotests/ospf_multi_instance/r1/frr.conf
@@ -0,0 +1,19 @@
+!
+hostname r1
+password zebra
+log file /tmp/r1-frr.log
+ip forwarding
+!
+interface lo
+ ip address 1.1.1.1/32
+ ip ospf area 0
+!
+interface r1-eth0
+ ip address 10.1.1.1/24
+ ip ospf area 0
+!
+!
+router ospf
+  ospf router-id 1.1.1.1
+  distance 20
+!
diff --git a/tests/topotests/ospf_multi_instance/r2/frr.conf b/tests/topotests/ospf_multi_instance/r2/frr.conf
new file mode 100644
index 000000000000..8501e0edc07d
--- /dev/null
+++ b/tests/topotests/ospf_multi_instance/r2/frr.conf
@@ -0,0 +1,37 @@
+!
+hostname r2
+password zebra
+! debug ospf event
+! debug ospf lsa
+! debug ospf default-information
+! debug ospf zebra redistribute
+
+ip forwarding
+!
+interface lo1
+ ip address 2.2.2.1/32
+ ip ospf 1 area 0
+ no shut
+!
+interface lo2
+ ip address 2.2.2.2/32
+ ip ospf 2 area 0
+ no shut
+!
+interface r2-eth0
+ ip address 10.1.1.2/24
+ ip ospf 1 area 0
+!
+interface r2-eth1
+ ip address 10.1.2.2/24
+ ip ospf 2 area 0
+!
+router ospf 1
+  ospf router-id 2.2.2.1
+  distance 20
+!
+router ospf 2
+  ospf router-id 2.2.2.2
+  distance 20
+!
+
diff --git a/tests/topotests/ospf_multi_instance/r3/frr.conf b/tests/topotests/ospf_multi_instance/r3/frr.conf
new file mode 100644
index 000000000000..97a3e19c9b10
--- /dev/null
+++ b/tests/topotests/ospf_multi_instance/r3/frr.conf
@@ -0,0 +1,19 @@
+!
+hostname r3
+password zebra
+log file /tmp/r3-frr.log
+ip forwarding
+!
+interface lo
+ ip address 3.3.3.1/32
+ ip ospf area 0
+!
+interface r3-eth0
+ ip address 10.1.2.3/24
+ ip ospf area 0
+!
+!
+router ospf
+  ospf router-id 3.3.3.1
+  distance 20
+!
diff --git a/tests/topotests/ospf_multi_instance/test_ospf_multi_instance.py b/tests/topotests/ospf_multi_instance/test_ospf_multi_instance.py
new file mode 100644
index 000000000000..de44140c09dc
--- /dev/null
+++ b/tests/topotests/ospf_multi_instance/test_ospf_multi_instance.py
@@ -0,0 +1,403 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# test_ospf_multi_instance.py
+#
+# Copyright (c) 2024 LabN Consulting
+# Acee Lindem
+#
+
+import os
+import sys
+from functools import partial
+import pytest
+
+# pylint: disable=C0413
+# Import topogen and topotest helpers
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+from lib.common_config import (
+    step,
+    create_interface_in_kernel,
+)
+
+
+"""
+test_ospf_metric_propagation.py: Test OSPF/BGP metric propagation
+"""
+
+TOPOLOGY = """
+
+ +---------+             +--------------------+             +---------+
+ |   r1    |             |  r2      |   r2    |             |   r3    |
+ |         |             | ospf 1   | ospf 2  |             |        |
+ | 1.1.1.1 | eth0    eth0| 2.2.2.1  | 2.2.2.2 |eth1     eth0| 3.3.3.1 |
+ |         +-------------+          |         +-------------+         |
+ |         | 10.1.1.0/24 |          |         | 10.1.2.0/24 |         |
+ +---------+             +--------------------+             +---------+
+
+
+"""
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# Required to instantiate the topology builder class.
+
+pytestmark = [pytest.mark.ospfd, pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+    "Build function"
+
+    # Create 3 routers
+    tgen.add_router("r1")
+    tgen.add_router("r2")
+    tgen.add_router("r3")
+
+    # Interconect router 1, 2 (0)
+    switch = tgen.add_switch("s1-1-2")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r2"])
+
+    # Interconect router 2, 3 (1)
+    switch = tgen.add_switch("s2-2-3")
+    switch.add_link(tgen.gears["r2"])
+    switch.add_link(tgen.gears["r3"])
+
+    # Add more loopbacks to r2
+    create_interface_in_kernel(
+        tgen, "r2", "lo1", "2.2.2.1", netmask="255.255.255.255", create=True
+    )
+    create_interface_in_kernel(
+        tgen, "r2", "lo2", "2.2.2.2", netmask="255.255.255.255", create=True
+    )
+
+
+def setup_module(mod):
+    logger.info("OSPF Multi-Instance:\n {}".format(TOPOLOGY))
+
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    # Starting Routers
+    router_list = tgen.routers()
+
+    for rname, router in router_list.items():
+        logger.info("Loading router %s" % rname)
+        router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
+
+    # Initialize all routers.
+    tgen.start_router()
+
+
+def teardown_module():
+    "Teardown the pytest environment"
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_multi_instance_default_origination():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip("Skipped because of router(s) failure")
+
+    step("Configure a local default route")
+    r1 = tgen.gears["r1"]
+    r1.vtysh_cmd("conf t\nip route 0.0.0.0/0 Null0")
+
+    step("Verify the R1 configuration and install of 'ip route 0.0.0.0/0 Null0'")
+    prefix_suppression_cfg = (
+        tgen.net["r1"]
+        .cmd('vtysh -c "show running" | grep "^ip route 0.0.0.0/0 Null0"')
+        .rstrip()
+    )
+    assertmsg = "'ip route 0.0.0.0/0 Null0' applied, but not present in configuration"
+    assert prefix_suppression_cfg == "ip route 0.0.0.0/0 Null0", assertmsg
+
+    input_dict = {
+        "0.0.0.0/0": [
+            {
+                "prefix": "0.0.0.0/0",
+                "prefixLen": 0,
+                "protocol": "static",
+                "nexthops": [
+                    {
+                        "blackhole": True,
+                    }
+                ],
+            }
+        ]
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r1, "show ip route 0.0.0.0/0 json", input_dict
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "0.0.0.0/0 not installed on router r1"
+    assert result is None, assertmsg
+
+    step(
+        "Verify the R1 configuration and advertisement of 'default-information originate'"
+    )
+    r1.vtysh_cmd("conf t\nrouter ospf\n default-information originate")
+
+    input_dict = {
+        "asExternalLinkStates": [
+            {
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "1.1.1.1",
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ]
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r1, "show ip ospf database json", input_dict
+    )
+
+    r2 = tgen.gears["r2"]
+    step("Verify the OSPF instance 1 installation of default route on router 2")
+    input_dict = {
+        "0.0.0.0/0": [
+            {
+                "prefix": "0.0.0.0/0",
+                "prefixLen": 0,
+                "protocol": "ospf",
+                "instance": 1,
+                "nexthops": [
+                    {
+                        "ip": "10.1.1.1",
+                        "interfaceName": "r2-eth0",
+                    }
+                ],
+            }
+        ]
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r2, "show ip route 0.0.0.0/0 json", input_dict
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "0.0.0.0/0 not installed on router r2"
+    assert result is None, assertmsg
+
+    step("Configure OSPF 'default-intformation originate' on router r2 instance 2")
+    r2.vtysh_cmd("conf t\nrouter ospf 2\n default-information originate")
+
+    step("Verify r2 instance 2 AS-External default origination")
+    input_dict = {
+        "ospfInstance": 2,
+        "routerId": "2.2.2.2",
+        "asExternalLinkStates": [
+            {
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "2.2.2.2",
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "tos": 0,
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ],
+    }
+    test_func = partial(
+        topotest.router_json_cmp,
+        r2,
+        "show ip ospf 2 database external json",
+        input_dict,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "AS-External default not originated by router r2 OSPF instance 2"
+    assert result is None, assertmsg
+
+    step("Update the OSPF instance 2 distance so it will be preferred over instance 1")
+    r2.vtysh_cmd("conf t\nrouter ospf 2\n distance 15")
+
+    step("Generate a default route from OSPF on r3")
+    r3 = tgen.gears["r3"]
+    r3.vtysh_cmd("conf t\nrouter ospf\n default-information originate")
+    r3.vtysh_cmd("conf t\nip route 0.0.0.0/0 Null0")
+
+    step("Verify r3 AS-External default origination on r2")
+    input_dict = {
+        "ospfInstance": 2,
+        "routerId": "2.2.2.2",
+        "asExternalLinkStates": [
+            {
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "3.3.3.1",
+                "length": 36,
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "tos": 0,
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ],
+    }
+    test_func = partial(
+        topotest.router_json_cmp,
+        r2,
+        "show ip ospf 2 database external json",
+        input_dict,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "AS-External default not originated by router r3 OSPF"
+    assert result is None, assertmsg
+
+    step("Verify r3's default installed by OSPF instance 2 is preferred on r2")
+    input_dict = {
+        "0.0.0.0/0": [
+            {
+                "prefix": "0.0.0.0/0",
+                "prefixLen": 0,
+                "protocol": "ospf",
+                "instance": 2,
+                "distance": 15,
+                "nexthops": [
+                    {
+                        "ip": "10.1.2.3",
+                        "interfaceName": "r2-eth1",
+                    }
+                ],
+            }
+        ]
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r2, "show ip route 0.0.0.0/0 json", input_dict
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "0.0.0.0/0 from r3 not installed on router r2"
+    assert result is None, assertmsg
+
+    step(
+        "Verify that r2's OSPF instance 2 AS-External LSA default is flushed due to default from r3"
+    )
+    input_dict = {
+        "ospfInstance": 2,
+        "routerId": "2.2.2.2",
+        "asExternalLinkStates": [
+            {
+                "lsaAge": 3600,
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "2.2.2.2",
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "tos": 0,
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ],
+    }
+    test_func = partial(
+        topotest.router_json_cmp,
+        r2,
+        "show ip ospf 2 database external json",
+        input_dict,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "AS-External default not flushed by router r2 OSPF instance 2"
+    assert result is None, assertmsg
+
+    step("Remove r3's default route and verify that its advertisement is flushed")
+    r3.vtysh_cmd("conf t\nno ip route 0.0.0.0/0 Null0")
+    input_dict = {
+        "routerId": "3.3.3.1",
+        "asExternalLinkStates": [
+            {
+                "lsaAge": 3600,
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "3.3.3.1",
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "tos": 0,
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ],
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r3, "show ip ospf database external json", input_dict
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "AS-External default not flushed by router r3 OSPF"
+    assert result is None, assertmsg
+
+    step(
+        "Verify that r2's OSPF instance 2 AS-External default is advertised and installed by r3"
+    )
+    input_dict = {
+        "routerId": "3.3.3.1",
+        "asExternalLinkStates": [
+            {
+                "lsaType": "AS-external-LSA",
+                "linkStateId": "0.0.0.0",
+                "advertisingRouter": "2.2.2.2",
+                "networkMask": 0,
+                "metricType": "E2 (Larger than any link state path)",
+                "tos": 0,
+                "metric": 10,
+                "forwardAddress": "0.0.0.0",
+                "externalRouteTag": 0,
+            }
+        ],
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r3, "show ip ospf database external json", input_dict
+    )
+    assertmsg = "AS-External default not originated by r2 OSPF instance 2"
+    assert result is None, assertmsg
+
+    step("Verify r2's OSPF instance 2 is AS-External default is installed on r3")
+    input_dict = {
+        "0.0.0.0/0": [
+            {
+                "prefix": "0.0.0.0/0",
+                "prefixLen": 0,
+                "protocol": "ospf",
+                "distance": 20,
+                "nexthops": [
+                    {
+                        "ip": "10.1.2.2",
+                        "interfaceName": "r3-eth0",
+                    }
+                ],
+            }
+        ]
+    }
+    test_func = partial(
+        topotest.router_json_cmp, r3, "show ip route 0.0.0.0/0 json", input_dict
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assertmsg = "0.0.0.0/0 from router r2 not installed on r3"
+    assert result is None, assertmsg
+
+
+def test_memory_leak():
+    "Run the memory leak test and report results."
+    tgen = get_topogen()
+    if not tgen.is_memleak_enabled():
+        pytest.skip("Memory leak test/report is disabled")
+
+    tgen.report_memory_leaks()
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))