diff --git a/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtRouter.java b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtRouter.java
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+++ b/core/api/src/main/java/org/onosproject/net/flowext/FlowRuleExtRouter.java
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+/*
+ * 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.net.flowext;
+
+import org.onosproject.net.flow.FlowRuleBatchEvent;
+import org.onosproject.net.flow.FlowRuleBatchRequest;
+
+import java.util.concurrent.Future;
+
+/**
+ * Experimental extension to the flow rule subsystem; still under development.
+ * Represents a router-like mechanism which is in charge of sending flow rule to master;
+ * <p>
+ * The Router is in charge of sending flow rule to master;
+ * the core component of routing-like mechanism.
+ * </p>
+ */
+public interface FlowRuleExtRouter {
+
+    /**
+     * apply the sub batch of flow extension rules.
+     *
+     * @param batchOperation batch of flow rules.
+     *                       A batch can contain flow rules for a single device only.
+     * @return Future response indicating success/failure of the batch operation
+     * all the way down to the device.
+     */
+    Future<FlowExtCompletedOperation> applySubBatch(FlowRuleBatchRequest batchOperation);
+
+    /**
+     * Invoked on the completion of a storeBatch operation.
+     *
+     * @param event flow rule batch event
+     */
+    void batchOperationComplete(FlowRuleBatchEvent event);
+
+    /**
+     * Register the listener to monitor Router,
+     * The Router find master to send downStream.
+     *
+     * @param listener the listener to register
+     */
+    public void addListener(FlowRuleExtRouterListener listener);
+
+    /**
+     * Remove the listener of Router.
+     *
+     * @param listener the listener to remove
+     */
+    public void removeListener(FlowRuleExtRouterListener listener);
+}