diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackRoutingService.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackRoutingService.java
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+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackRoutingService.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.openstacknetworking;
+
+/**
+ * The Interface of Openstack Routing.
+ */
+public interface OpenstackRoutingService {
+
+    /**
+     * Stores the Floating IP information created by Openstack.
+     *
+     * @param openstackFloatingIP Floating IP information
+     */
+    void createFloatingIP(OpenstackFloatingIP openstackFloatingIP);
+
+    /**
+     * Updates flow rules corresponding to the Floating IP information updated by Openstack.
+     *
+     * @param openstackFloatingIP Floating IP information
+     */
+    void updateFloatingIP(OpenstackFloatingIP openstackFloatingIP);
+
+    /**
+     * Removes flow rules corresponding to Floating IP information removed by Openstack.
+     *
+     * @param id Deleted Floating IP`s ID
+     */
+    void deleteFloatingIP(String id);
+
+    /**
+     * Stores the router information created by Openstack.
+     *
+     * @param openstackRouter Floating IP information
+     */
+    void createRouter(OpenstackRouter openstackRouter);
+
+    /**
+     * Updates flow rules corresponding to the router information updated by Openstack.
+     *
+     * @param openstackRouter Router information
+     */
+    void updateRouter(OpenstackRouter openstackRouter);
+
+    /**
+     * Removes flow rules corresponding to the router information removed by Openstack.
+     *
+     * @param id Deleted router`s ID
+     */
+    void deleteRouter(String id);
+
+    /**
+     * Updates flow rules corresponding to the router information updated by Openstack.
+     *
+     * @param openstackRouterInterface Router information
+     */
+    void updateRouterInterface(OpenstackRouterInterface openstackRouterInterface);
+
+    /**
+     * Removes flow rules corresponding to the router information removed by Openstack.
+     *
+     * @param openstackRouterInterface Router information
+     */
+    void removeRouterInterface(OpenstackRouterInterface openstackRouterInterface);
+
+
+}