diff --git a/src/main/java/org/onosproject/cordvtn/api/CordVtnService.java b/src/main/java/org/onosproject/cordvtn/api/CordVtnService.java
new file mode 100644
index 0000000..5950670
--- /dev/null
+++ b/src/main/java/org/onosproject/cordvtn/api/CordVtnService.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2015-present 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.cordvtn.api;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.HostId;
+
+import java.util.Map;
+
+/**
+ * Service for provisioning overlay virtual networks on compute nodes.
+ */
+public interface CordVtnService {
+
+    String CORDVTN_APP_ID = "org.onosproject.cordvtn";
+
+    /**
+     * Adds a new VM on a given node and connect point.
+     *
+     * @param node cordvtn node
+     * @param connectPoint connect point
+     */
+    void addServiceVm(CordVtnNode node, ConnectPoint connectPoint);
+
+    /**
+     * Removes a VM from a given node and connect point.
+     *
+     * @param connectPoint connect point
+     */
+    void removeServiceVm(ConnectPoint connectPoint);
+
+    /**
+     * Creates dependencies for a given tenant service.
+     *
+     * @param tServiceId id of the service which has a dependency
+     * @param pServiceId id of the service which provide dependency
+     * @param isBidirectional true to enable bidirectional connectivity between two services
+     */
+    void createServiceDependency(CordServiceId tServiceId,
+                                 CordServiceId pServiceId,
+                                 boolean isBidirectional);
+
+    /**
+     * Removes all dependencies from a given tenant service.
+     *
+     * @param tServiceId id of the service which has a dependency
+     * @param pServiceId id of the service which provide dependency
+     */
+    void removeServiceDependency(CordServiceId tServiceId, CordServiceId pServiceId);
+
+    /**
+     * Updates virtual service gateways.
+     *
+     * @param vSgHost host id of vSG host
+     * @param serviceVlan service vlan id
+     * @param vSgs map of ip and mac address of vSGs running in this vSG host
+     */
+    void updateVirtualSubscriberGateways(HostId vSgHost, String serviceVlan,
+                                         Map<IpAddress, MacAddress> vSgs);
+}