diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java
new file mode 100644
index 0000000..7bfafed
--- /dev/null
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/router/impl/RouterManager.java
@@ -0,0 +1,273 @@
+/*
+ * 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.router.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.DefaultRouter;
+import org.onosproject.vtnrsc.FixedIp;
+import org.onosproject.vtnrsc.Router;
+import org.onosproject.vtnrsc.RouterGateway;
+import org.onosproject.vtnrsc.RouterId;
+import org.onosproject.vtnrsc.SubnetId;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.TenantNetworkId;
+import org.onosproject.vtnrsc.VirtualPortId;
+import org.onosproject.vtnrsc.router.RouterEvent;
+import org.onosproject.vtnrsc.router.RouterListener;
+import org.onosproject.vtnrsc.router.RouterService;
+import org.onosproject.vtnrsc.subnet.SubnetService;
+import org.onosproject.vtnrsc.tenantnetwork.TenantNetworkService;
+import org.onosproject.vtnrsc.virtualport.VirtualPortService;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Provides implementation of the Router service.
+ */
+@Component(immediate = true)
+@Service
+public class RouterManager implements RouterService {
+
+    private static final String ROUTER_ID_NULL = "Router ID cannot be null";
+    private static final String ROUTER_NOT_NULL = "Router cannot be null";
+    private static final String ROUTER = "vtn-router-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<RouterListener> listeners = Sets.newCopyOnWriteArraySet();
+    private EventuallyConsistentMapListener<RouterId, Router> routerListener = new InnerRouterStoreListener();
+    protected EventuallyConsistentMap<RouterId, Router> routerStore;
+    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 TenantNetworkService tenantNetworkService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected VirtualPortService virtualPortService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected SubnetService subnetService;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication(VTNRSC_APP);
+        KryoNamespace.Builder serializer = KryoNamespace
+                .newBuilder()
+                .register(KryoNamespaces.API)
+                .register(Router.class, RouterId.class, DefaultRouter.class,
+                          TenantNetworkId.class, TenantId.class,
+                          VirtualPortId.class, DefaultRouter.class,
+                          RouterGateway.class, Router.Status.class,
+                          SubnetId.class);
+        routerStore = storageService
+                .<RouterId, Router>eventuallyConsistentMapBuilder()
+                .withName(ROUTER).withSerializer(serializer)
+                .withTimestampProvider((k, v) -> new WallClockTimestamp())
+                .build();
+        routerStore.addListener(routerListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        routerStore.removeListener(routerListener);
+        routerStore.destroy();
+        listeners.clear();
+        log.info("Stopped");
+    }
+
+    @Override
+    public boolean exists(RouterId routerId) {
+        checkNotNull(routerId, ROUTER_ID_NULL);
+        return routerStore.containsKey(routerId);
+    }
+
+    @Override
+    public Collection<Router> getRouters() {
+        return Collections.unmodifiableCollection(routerStore.values());
+    }
+
+    @Override
+    public Router getRouter(RouterId routerId) {
+        checkNotNull(routerId, ROUTER_ID_NULL);
+        return routerStore.get(routerId);
+    }
+
+    @Override
+    public boolean createRouters(Collection<Router> routers) {
+        checkNotNull(routers, ROUTER_NOT_NULL);
+        for (Router router : routers) {
+            verifyRouterData(router);
+            routerStore.put(router.id(), router);
+            if (!routerStore.containsKey(router.id())) {
+                log.debug("The router is created failed whose identifier is {}",
+                          router.id().toString());
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean updateRouters(Collection<Router> routers) {
+        checkNotNull(routers, ROUTER_NOT_NULL);
+        if (routers != null) {
+            for (Router router : routers) {
+                if (!routerStore.containsKey(router.id())) {
+                    log.debug("The routers is not exist whose identifier is {}",
+                              router.id().toString());
+                    throw new IllegalArgumentException(
+                                                       "routers ID doesn't exist");
+                }
+                verifyRouterData(router);
+                routerStore.put(router.id(), router);
+                if (!router.equals(routerStore.get(router.id()))) {
+                    log.debug("The router is updated failed whose identifier is {}",
+                              router.id().toString());
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean removeRouters(Collection<RouterId> routerIds) {
+        checkNotNull(routerIds, ROUTER_ID_NULL);
+        if (routerIds != null) {
+            for (RouterId routerId : routerIds) {
+                if (!routerStore.containsKey(routerId)) {
+                    log.debug("The router is not exist whose identifier is {}",
+                              routerId.toString());
+                    throw new IllegalArgumentException(
+                                                       "router ID doesn't exist");
+                }
+                Router router = routerStore.get(routerId);
+                routerStore.remove(routerId, router);
+                if (routerStore.containsKey(routerId)) {
+                    log.debug("The router deleted is failed whose identifier is {}",
+                              routerId.toString());
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public void addListener(RouterListener listener) {
+        checkNotNull(listener, LISTENER_NOT_NULL);
+        listeners.add(listener);
+    }
+
+    @Override
+    public void removeListener(RouterListener listener) {
+        checkNotNull(listener, LISTENER_NOT_NULL);
+        listeners.remove(listener);
+    }
+
+    /**
+     * Verifies validity of Router data.
+     *
+     * @param routers router instance
+     */
+    private void verifyRouterData(Router routers) {
+        checkNotNull(routers, ROUTER_NOT_NULL);
+        if (routers.gatewayPortid() != null
+                && !virtualPortService.exists(routers.gatewayPortid())) {
+            log.debug("The gateway port ID is not exist whose identifier is {}",
+                      routers.gatewayPortid().toString());
+            throw new IllegalArgumentException("gateway port ID doesn't exist");
+        }
+
+        if (routers.externalGatewayInfo() != null) {
+            RouterGateway routerGateway = routers.externalGatewayInfo();
+            if (!tenantNetworkService.exists(routerGateway.networkId())) {
+                log.debug("The network ID of gateway info is not exist whose identifier is {}",
+                          routers.id().toString());
+                throw new IllegalArgumentException(
+                                                   "network ID of gateway info doesn't exist");
+            }
+            Iterable<FixedIp> fixedIps = routerGateway.externalFixedIps();
+            for (FixedIp fixedIp : fixedIps) {
+                if (!subnetService.exists(fixedIp.subnetId())) {
+                    log.debug("The subnet ID of gateway info is not exist whose identifier is {}",
+                              routers.id().toString());
+                    throw new IllegalArgumentException(
+                                                       "subnet ID of gateway info doesn't exist");
+                }
+            }
+        }
+    }
+
+    private class InnerRouterStoreListener
+            implements EventuallyConsistentMapListener<RouterId, Router> {
+
+        @Override
+        public void event(EventuallyConsistentMapEvent<RouterId, Router> event) {
+            checkNotNull(event, EVENT_NOT_NULL);
+            Router router = event.value();
+            if (EventuallyConsistentMapEvent.Type.PUT == event.type()) {
+                notifyListeners(new RouterEvent(RouterEvent.Type.ROUTER_PUT,
+                                                router));
+            }
+            if (EventuallyConsistentMapEvent.Type.REMOVE == event.type()) {
+                notifyListeners(new RouterEvent(RouterEvent.Type.ROUTER_DELETE,
+                                                router));
+            }
+        }
+    }
+
+    /**
+     * Notifies specify event to all listeners.
+     *
+     * @param event Floating IP event
+     */
+    private void notifyListeners(RouterEvent event) {
+        checkNotNull(event, EVENT_NOT_NULL);
+        listeners.forEach(listener -> listener.event(event));
+    }
+}