From 3c8ae454b424d937183ccdadf509cb4f0cd79bfc Mon Sep 17 00:00:00 2001
From: jcaiMR <111116206+jcaiMR@users.noreply.github.com>
Date: Tue, 25 Jul 2023 09:28:16 +0800
Subject: [PATCH] [202012] dhcprelay add Loopback0 as source interface in
 dualtor scenario  (#15744)

#### Why I did it
1. sonic-build image side change to fix source interface selection in dual tor scenario.
dhcprelay related PR:
https://github.com/sonic-net/sonic-dhcp-relay/pull/40

2. Announce dhcprelay submodule to 3578eb3 (to invoke [#40](https://github.com/sonic-net/sonic-dhcp-relay/pull/40
) PR)

##### Work item tracking
- Microsoft ADO 24243215

#### How to verify it
run test case, dhcp_relay/test_dhcpv6_relay.py
---
 dockers/docker-dhcp-relay/dhcpv6-relay.agents.j2 | 2 +-
 src/dhcprelay                                    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dockers/docker-dhcp-relay/dhcpv6-relay.agents.j2 b/dockers/docker-dhcp-relay/dhcpv6-relay.agents.j2
index 8f83e05efc7c..e392711f5326 100644
--- a/dockers/docker-dhcp-relay/dhcpv6-relay.agents.j2
+++ b/dockers/docker-dhcp-relay/dhcpv6-relay.agents.j2
@@ -13,7 +13,7 @@
 [program:dhcp6relay]
 command=/usr/sbin/dhcp6relay
 {#- Dual ToR Option #}
-{% if 'subtype' in DEVICE_METADATA['localhost'] and DEVICE_METADATA['localhost']['subtype'] == 'DualToR' %} -d{% endif %}
+{% if 'subtype' in DEVICE_METADATA['localhost'] and DEVICE_METADATA['localhost']['subtype'] == 'DualToR' %} -u Loopback0 {% endif %}
 
 priority=3
 autostart=false
diff --git a/src/dhcprelay b/src/dhcprelay
index a4b15d8ba429..3578eb337860 160000
--- a/src/dhcprelay
+++ b/src/dhcprelay
@@ -1 +1 @@
-Subproject commit a4b15d8ba429c2799d3927f8dca376745af08c1a
+Subproject commit 3578eb337860fa98672655d4182d2df4ce2b3bfe