diff --git a/systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py b/systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py
index 41b5e9a9168..f74ff479123 100755
--- a/systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py
+++ b/systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py
@@ -307,7 +307,7 @@ class CsIP:
             # The code looks redundant here, but we actually have to cater for routers and
             # VPC routers in a different manner. Please do not remove this block otherwise
             # The VPC default route will be broken.
-            if self.get_type() in ["public"]:
+            if self.get_type() in ["public"] and address["device"] in PUBLIC_INTERFACE:
                 gateway = str(address["gateway"])
                 route.add_defaultroute(gateway)
         else:
diff --git a/systemvm/patches/debian/config/opt/cloud/bin/cs/CsRedundant.py b/systemvm/patches/debian/config/opt/cloud/bin/cs/CsRedundant.py
index 77d0a6b9ccf..92f27cedc16 100755
--- a/systemvm/patches/debian/config/opt/cloud/bin/cs/CsRedundant.py
+++ b/systemvm/patches/debian/config/opt/cloud/bin/cs/CsRedundant.py
@@ -41,6 +41,7 @@ from CsRoute import CsRoute
 import socket
 from time import sleep
 
+PUBLIC_INTERFACE = ['eth0', 'eth1']
 
 class CsRedundant(object):
 
@@ -228,7 +229,7 @@ class CsRedundant(object):
         self.set_lock()
         logging.info("Router switched to fault mode")
 
-        ips = [ip for ip in self.address.get_ips() if ip.is_public()]
+        ips = [ip for ip in self.address.get_ips() if ip.is_public() and ip.get_device() in PUBLIC_INTERFACE]
         for ip in ips:
             CsHelper.execute("ifconfig %s down" % ip.get_device())
 
@@ -257,7 +258,7 @@ class CsRedundant(object):
         logging.debug("Setting router to backup")
 
         dev = ''
-        ips = [ip for ip in self.address.get_ips() if ip.is_public()]
+        ips = [ip for ip in self.address.get_ips() if ip.is_public() and ip.get_device() in PUBLIC_INTERFACE]
         for ip in ips:
             if dev == ip.get_device():
                 continue
@@ -291,7 +292,7 @@ class CsRedundant(object):
         logging.debug("Setting router to master")
 
         dev = ''
-        ips = [ip for ip in self.address.get_ips() if ip.is_public()]
+        ips = [ip for ip in self.address.get_ips() if ip.is_public() and ip.get_device() in PUBLIC_INTERFACE]
         route = CsRoute()
         for ip in ips:
             if dev == ip.get_device():