[ONOS-7444] Optimize SONA gw doesn't use vrouter app and quagga anymore
- Done: Deriving MAC address from external peer router, SNAT, Floating IP-based routing
- Todo: Vlan, GW loadbalancing

Change-Id: I0cc2a61295c28fa6a796046ca142c4ef525b70d3
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
index 8d16bce..230e740 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
@@ -418,6 +418,17 @@
         }
     }
 
+    @Override
+    public void deleteExternalPeerRouter(String ipAddress) {
+        if (ipAddress == null) {
+            return;
+        }
+
+        if (externalPeerRouterMap.containsKey(ipAddress)) {
+            externalPeerRouterMap.remove(ipAddress);
+        }
+
+    }
     private IpAddress getExternalGatewaySourceIp(ExternalGateway externalGateway, Router router) {
         Port exGatewayPort = ports(externalGateway.getNetworkId())
                 .stream()