Fix ONOS Jira-4189

Change-Id: I9725f4e8cfd7382dd2c34066951e993543e86539
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java
index b796fd7..3916d74 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java
@@ -101,7 +101,7 @@
                           TenantNetworkId.class, TenantId.class,
                           VirtualPortId.class, DefaultRouter.class,
                           RouterGateway.class, Router.Status.class,
-                          SubnetId.class);
+                          SubnetId.class, FixedIp.class);
         routerStore = storageService
                 .<RouterId, Router>eventuallyConsistentMapBuilder()
                 .withName(ROUTER).withSerializer(serializer)