From cc21284978ddb27e9b93b1b3de2541ef96a13b34 Mon Sep 17 00:00:00 2001
From: Longxiang Lyu <lolv@microsoft.com>
Date: Tue, 27 Sep 2022 10:10:32 +0000
Subject: [PATCH] [vlanmgr] Disable `arp_evict_nocarrier` for vlan host intf

Signed-off-by: Longxiang Lyu <lolv@microsoft.com>
---
 cfgmgr/vlanmgr.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cfgmgr/vlanmgr.cpp b/cfgmgr/vlanmgr.cpp
index 1536349cb0..e74582ce29 100644
--- a/cfgmgr/vlanmgr.cpp
+++ b/cfgmgr/vlanmgr.cpp
@@ -134,6 +134,11 @@ bool VlanMgr::addHostVlan(int vlan_id)
     std::string res;
     EXEC_WITH_ERROR_THROW(cmds, res);
 
+    res.clear();
+    const std::string echo_cmd = std::string("")
+      + ECHO_CMD + " 0 > /proc/sys/net/ipv4/conf/" + VLAN_PREFIX + std::to_string(vlan_id) + "/arp_evict_nocarrier";
+    swss::exec(echo_cmd, res);
+
     return true;
 }