diff --git a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbClientService.java b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbClientService.java
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--- /dev/null
+++ b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbClientService.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2015 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.ovsdb.controller;
+
+import java.util.Set;
+
+import org.onlab.packet.IpAddress;
+
+/**
+ * Represents to provider facing side of a node.
+ */
+public interface OvsdbClientService {
+    /**
+     * Gets the node identifier.
+     *
+     * @return node identifier
+     */
+    OvsdbNodeId nodeId();
+
+    /**
+     * Creates the configuration for the tunnel.
+     *
+     * @param srcIp source IP address
+     * @param dstIp destination IP address
+     */
+    void createTunnel(IpAddress srcIp, IpAddress dstIp);
+
+    /**
+     * Drops the configuration for the tunnel.
+     *
+     * @param srcIp source IP address
+     * @param dstIp destination IP address
+     */
+    void dropTunnel(IpAddress srcIp, IpAddress dstIp);
+
+    /**
+     * Gets tunnels of the node.
+     *
+     * @return set of tunnels; empty if no tunnel is find
+     */
+    Set<OvsdbTunnel> getTunnels();
+
+    /**
+     * Creates a bridge.
+     *
+     * @param bridgeName bridge name
+     */
+    void createBridge(String bridgeName);
+
+    /**
+     * Drops a bridge.
+     *
+     * @param bridgeName bridge name
+     */
+    void dropBridge(String bridgeName);
+
+    /**
+     * Gets bridges of the node.
+     *
+     * @return set of bridges; empty if no bridge is find
+     */
+    Set<OvsdbBridge> getBridges();
+
+    /**
+     * Creates a port.
+     *
+     * @param bridgeName bridge name
+     * @param portName port name
+     */
+    void createPort(String bridgeName, String portName);
+
+    /**
+     * Drops a port.
+     *
+     * @param bridgeName bridge name
+     * @param portName port name
+     */
+    void dropPort(String bridgeName, String portName);
+
+    /**
+     * Gets ports of the bridge.
+     *
+     * @return set of ports; empty if no ports is find
+     */
+    Set<OvsdbPort> getPorts();
+
+    /**
+     * Checks if the node is still connected.
+     *
+     * @return true if the node is still connected
+     */
+    boolean isConnected();
+
+}