From f7151e8ddba235848e6707e020fdf8a680fbad77 Mon Sep 17 00:00:00 2001
From: Joe LeVeque <jleveque@users.noreply.github.com>
Date: Tue, 24 Apr 2018 15:13:51 -0700
Subject: [PATCH] [radvd] Ensure at least one interface is specified in
 radvd.conf before starting radvd (#1636)

---
 dockers/docker-router-advertiser/start.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/dockers/docker-router-advertiser/start.sh b/dockers/docker-router-advertiser/start.sh
index 7fcaf65a79..159006a176 100755
--- a/dockers/docker-router-advertiser/start.sh
+++ b/dockers/docker-router-advertiser/start.sh
@@ -14,5 +14,12 @@ fi
 # Generate /etc/radvd.conf config file
 sonic-cfggen -d -t /usr/share/sonic/templates/radvd.conf.j2 > /etc/radvd.conf
 
+# Enusre at least one interface is specified in radvd.conf
+NUM_IFACES=$(grep -c "^interface " /etc/radvd.conf)
+if [ $NUM_IFACES -eq 0 ]; then
+    echo "No interfaces specified in radvd.conf. Not starting router advertiser process."
+    exit 0
+fi
+
 # Start the router advertiser
 supervisorctl start radvd