diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
index 00f15ed..4276cf2 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
@@ -40,7 +40,17 @@
         /**
          * Signifies that the instance port is disabled.
          */
-        OPENSTACK_INSTANCE_PORT_VANISHED
+        OPENSTACK_INSTANCE_PORT_VANISHED,
+
+        /**
+         * Signifies that the instance migration is started.
+         */
+        OPENSTACK_INSTANCE_MIGRATION_STARTED,
+
+        /**
+         * Signifies that the instance is migration is ended.
+         */
+        OPENSTACK_INSTANCE_MIGRATION_ENDED
     }
 
     /**
diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortService.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortService.java
index f5ebe11..d462e1b 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortService.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortService.java
@@ -66,4 +66,18 @@
      * @return set of instance ports; empty list if no port exists
      */
     Set<InstancePort> instancePorts(String osNetId);
+
+    /**
+     * Processes instance port addition event caused by VM migration.
+     *
+     * @param port instance port
+     */
+    void migrationPortAdded(InstancePort port);
+
+    /**
+     * Processes instance port removal event caused by VM migration.
+     *
+     * @param port instance port
+     */
+    void migrationPortRemoved(InstancePort port);
 }