diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/routerinterface/impl/RouterInterfaceManager.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/routerinterface/impl/RouterInterfaceManager.java
new file mode 100644
index 0000000..244a5c0
--- /dev/null
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/routerinterface/impl/RouterInterfaceManager.java
@@ -0,0 +1,235 @@
+/*
+ * 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.vtnrsc.routerinterface.impl;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Set;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.EventuallyConsistentMap;
+import org.onosproject.store.service.EventuallyConsistentMapEvent;
+import org.onosproject.store.service.EventuallyConsistentMapListener;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.WallClockTimestamp;
+import org.onosproject.vtnrsc.RouterId;
+import org.onosproject.vtnrsc.RouterInterface;
+import org.onosproject.vtnrsc.SubnetId;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.VirtualPortId;
+import org.onosproject.vtnrsc.router.RouterService;
+import org.onosproject.vtnrsc.routerinterface.RouterInterfaceEvent;
+import org.onosproject.vtnrsc.routerinterface.RouterInterfaceListener;
+import org.onosproject.vtnrsc.routerinterface.RouterInterfaceService;
+import org.onosproject.vtnrsc.subnet.SubnetService;
+import org.onosproject.vtnrsc.virtualport.VirtualPortService;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Provides implementation of the Router interface service.
+ */
+@Component(immediate = true)
+@Service
+public class RouterInterfaceManager implements RouterInterfaceService {
+    private static final String SUBNET_ID_NULL = "Subnet ID cannot be null";
+    private static final String ROUTER_INTERFACE_NULL = "Router Interface cannot be null";
+    private static final String ROUTER_INTERFACE = "vtn-router-interface-store";
+    private static final String VTNRSC_APP = "org.onosproject.vtnrsc";
+    private static final String LISTENER_NOT_NULL = "Listener cannot be null";
+    private static final String EVENT_NOT_NULL = "event cannot be null";
+
+    private final Logger log = getLogger(getClass());
+    private final Set<RouterInterfaceListener> listeners = Sets
+            .newCopyOnWriteArraySet();
+    private EventuallyConsistentMapListener<SubnetId, RouterInterface> routerInterfaceListener =
+            new InnerRouterInterfaceStoreListener();
+    protected EventuallyConsistentMap<SubnetId, RouterInterface> routerInterfaceStore;
+    protected ApplicationId appId;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected VirtualPortService virtualPortService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected SubnetService subnetService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected RouterService routerService;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication(VTNRSC_APP);
+        KryoNamespace.Builder serializer = KryoNamespace
+                .newBuilder()
+                .register(KryoNamespaces.API)
+                .register(RouterId.class, TenantId.class, VirtualPortId.class,
+                          RouterInterface.class, SubnetId.class);
+        routerInterfaceStore = storageService
+                .<SubnetId, RouterInterface>eventuallyConsistentMapBuilder()
+                .withName(ROUTER_INTERFACE).withSerializer(serializer)
+                .withTimestampProvider((k, v) -> new WallClockTimestamp())
+                .build();
+        routerInterfaceStore.addListener(routerInterfaceListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        routerInterfaceStore.removeListener(routerInterfaceListener);
+        routerInterfaceStore.destroy();
+        listeners.clear();
+        log.info("Stopped");
+    }
+
+    @Override
+    public boolean exists(SubnetId subnetId) {
+        checkNotNull(subnetId, SUBNET_ID_NULL);
+        return routerInterfaceStore.containsKey(subnetId);
+    }
+
+    @Override
+    public Collection<RouterInterface> getRouterInterfaces() {
+        return Collections
+                .unmodifiableCollection(routerInterfaceStore.values());
+    }
+
+    @Override
+    public RouterInterface getRouterInterface(SubnetId subnetId) {
+        checkNotNull(subnetId, SUBNET_ID_NULL);
+        return routerInterfaceStore.get(subnetId);
+    }
+
+    @Override
+    public boolean addRouterInterface(RouterInterface routerInterface) {
+        checkNotNull(routerInterface, ROUTER_INTERFACE_NULL);
+        verifyRouterInterfaceData(routerInterface);
+        routerInterfaceStore.put(routerInterface.subnetId(), routerInterface);
+        if (!routerInterfaceStore.containsKey(routerInterface.subnetId())) {
+            log.debug("The router interface is created failed whose identifier is {}",
+                      routerInterface.subnetId().toString());
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public boolean removeRouterInterface(RouterInterface routerInterface) {
+        checkNotNull(routerInterface, ROUTER_INTERFACE_NULL);
+        if (!routerInterfaceStore.containsKey(routerInterface.subnetId())) {
+            log.debug("The router interface is not exist whose identifier is {}",
+                      routerInterface.subnetId().toString());
+            throw new IllegalArgumentException("subnet ID doesn't exist");
+        }
+        verifyRouterInterfaceData(routerInterface);
+        routerInterfaceStore
+                .remove(routerInterface.subnetId(), routerInterface);
+        if (routerInterfaceStore.containsKey(routerInterface.subnetId())) {
+            log.debug("The router interface deleted is failed whose identifier is {}",
+                      routerInterface.subnetId().toString());
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public void addListener(RouterInterfaceListener listener) {
+        checkNotNull(listener, LISTENER_NOT_NULL);
+        listeners.add(listener);
+    }
+
+    @Override
+    public void removeListener(RouterInterfaceListener listener) {
+        checkNotNull(listener, LISTENER_NOT_NULL);
+        listeners.remove(listener);
+    }
+
+    /**
+     * Verifies validity of Router interface data.
+     *
+     * @param routers router instance
+     */
+    private void verifyRouterInterfaceData(RouterInterface routerInterface) {
+        checkNotNull(routerInterface, ROUTER_INTERFACE_NULL);
+        if (!subnetService.exists(routerInterface.subnetId())) {
+            log.debug("The subnet ID of interface is not exist whose identifier is {}",
+                      routerInterface.subnetId().toString());
+            throw new IllegalArgumentException(
+                                               "subnet ID of interface doesn't exist");
+        }
+        if (!virtualPortService.exists(routerInterface.portId())) {
+            log.debug("The port ID of interface is not exist whose identifier is {}",
+                      routerInterface.portId().toString());
+            throw new IllegalArgumentException(
+                                               "port ID of interface doesn't exist");
+        }
+        if (!routerService.exists(routerInterface.routerId())) {
+            log.debug("The router ID of interface is not exist whose identifier is {}",
+                      routerInterface.routerId().toString());
+            throw new IllegalArgumentException(
+                                               "router ID of interface doesn't exist");
+        }
+    }
+
+    private class InnerRouterInterfaceStoreListener
+            implements
+            EventuallyConsistentMapListener<SubnetId, RouterInterface> {
+
+        @Override
+        public void event(EventuallyConsistentMapEvent<SubnetId, RouterInterface> event) {
+            checkNotNull(event, EVENT_NOT_NULL);
+            RouterInterface routerInterface = event.value();
+            if (EventuallyConsistentMapEvent.Type.PUT == event.type()) {
+                notifyListeners(new RouterInterfaceEvent(
+                                                         RouterInterfaceEvent.Type.ROUTER_INTERFACE_PUT,
+                                                         routerInterface));
+            }
+            if (EventuallyConsistentMapEvent.Type.REMOVE == event.type()) {
+                notifyListeners(new RouterInterfaceEvent(
+                                                         RouterInterfaceEvent.Type.ROUTER_INTERFACE_DELETE,
+                                                         routerInterface));
+            }
+        }
+    }
+
+    /**
+     * Notifies specify event to all listeners.
+     *
+     * @param event Floating IP event
+     */
+    private void notifyListeners(RouterInterfaceEvent event) {
+        checkNotNull(event, EVENT_NOT_NULL);
+        listeners.forEach(listener -> listener.event(event));
+    }
+}