diff --git a/apps/vtn/vtnmgr/src/main/java/org/onosproject/vtn/manager/impl/VTNManager.java b/apps/vtn/vtnmgr/src/main/java/org/onosproject/vtn/manager/impl/VTNManager.java
new file mode 100644
index 0000000..7192ad9
--- /dev/null
+++ b/apps/vtn/vtnmgr/src/main/java/org/onosproject/vtn/manager/impl/VTNManager.java
@@ -0,0 +1,528 @@
+/*
+ * 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.vtn.manager.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+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.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Host;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.behaviour.BridgeConfig;
+import org.onosproject.net.behaviour.BridgeDescription;
+import org.onosproject.net.config.NetworkConfigService;
+import org.onosproject.net.config.basics.BasicDeviceConfig;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.driver.DriverHandler;
+import org.onosproject.net.driver.DriverService;
+import org.onosproject.net.flowobjective.Objective;
+import org.onosproject.net.host.HostEvent;
+import org.onosproject.net.host.HostListener;
+import org.onosproject.net.host.HostService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.EventuallyConsistentMap;
+import org.onosproject.store.service.LogicalClockService;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.vtn.manager.VTNService;
+import org.onosproject.vtn.table.ClassifierService;
+import org.onosproject.vtn.table.L2ForwardService;
+import org.onosproject.vtn.table.impl.ClassifierServiceImpl;
+import org.onosproject.vtn.table.impl.L2ForwardServiceImpl;
+import org.onosproject.vtn.util.DataPathIdGenerator;
+import org.onosproject.vtn.util.VtnConfig;
+import org.onosproject.vtn.util.VtnData;
+import org.onosproject.vtnrsc.SegmentationId;
+import org.onosproject.vtnrsc.SubnetId;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.TenantNetwork;
+import org.onosproject.vtnrsc.TenantNetworkId;
+import org.onosproject.vtnrsc.VirtualPort;
+import org.onosproject.vtnrsc.VirtualPortId;
+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 VTNService.
+ */
+@Component(immediate = true)
+@Service
+public class VTNManager implements VTNService {
+    private final Logger log = getLogger(getClass());
+    private static final String APP_ID = "org.onosproject.app.vtn";
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected NetworkConfigService configService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected HostService hostService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected TenantNetworkService tenantNetworkService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected VirtualPortService virtualPortService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DriverService driverService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected LogicalClockService clockService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MastershipService mastershipService;
+
+    private ApplicationId appId;
+    private ClassifierService classifierService;
+    private L2ForwardService l2ForwardService;
+
+    private final HostListener hostListener = new InnerHostListener();
+    private final DeviceListener deviceListener = new InnerDeviceListener();
+
+    private static final String IFACEID = "ifaceid";
+    private static final String CONTROLLER_IP_KEY = "ipaddress";
+    public static final String DRIVER_NAME = "onosfw";
+    private static final String EX_PORT_NAME = "eth0";
+    private static final String SWITCHES_OF_CONTROLLER = "switchesOfController";
+    private static final String SWITCH_OF_LOCAL_HOST_PORTS = "switchOfLocalHostPorts";
+
+    private EventuallyConsistentMap<IpAddress, Boolean> switchesOfController;
+    private ConsistentMap<DeviceId, NetworkOfLocalHostPorts> switchOfLocalHostPorts;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication(APP_ID);
+        classifierService = new ClassifierServiceImpl(appId);
+        l2ForwardService = new L2ForwardServiceImpl(appId);
+
+        deviceService.addListener(deviceListener);
+        hostService.addListener(hostListener);
+
+        KryoNamespace.Builder serializer = KryoNamespace.newBuilder()
+                                .register(KryoNamespaces.API)
+                                .register(NetworkOfLocalHostPorts.class)
+                                .register(TenantNetworkId.class)
+                                .register(Host.class)
+                                .register(TenantNetwork.class)
+                                .register(TenantId.class)
+                                .register(SubnetId.class);
+
+        switchesOfController = storageService
+                .<IpAddress, Boolean>eventuallyConsistentMapBuilder()
+                .withName(SWITCHES_OF_CONTROLLER).withSerializer(serializer)
+                .withTimestampProvider((k, v) -> clockService.getTimestamp())
+                .build();
+
+        switchOfLocalHostPorts = storageService
+                .<DeviceId, NetworkOfLocalHostPorts>consistentMapBuilder()
+                .withName(SWITCH_OF_LOCAL_HOST_PORTS)
+                .withSerializer(Serializer.using(serializer.build()))
+                .build();
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        deviceService.removeListener(deviceListener);
+        hostService.removeListener(hostListener);
+        log.info("Stopped");
+    }
+
+    @Override
+    public void onControllerDetected(Device controllerDevice) {
+        if (controllerDevice == null) {
+            log.error("The controller device is null");
+            return;
+        }
+        String localIpAddress = controllerDevice.annotations()
+                .value(CONTROLLER_IP_KEY);
+        IpAddress localIp = IpAddress.valueOf(localIpAddress);
+        DeviceId controllerDeviceId = controllerDevice.id();
+        DriverHandler handler = driverService.createHandler(controllerDeviceId);
+        if (mastershipService.isLocalMaster(controllerDeviceId)) {
+            // Get DataPathIdGenerator
+            String ipaddress = controllerDevice.annotations().value("ipaddress");
+            DataPathIdGenerator dpidGenerator = DataPathIdGenerator.builder()
+                                            .addIpAddress(ipaddress).build();
+            DeviceId deviceId = dpidGenerator.getDeviceId();
+            String dpid = dpidGenerator.getDpId();
+            // Inject pipeline driver name
+            BasicDeviceConfig config = configService.addConfig(deviceId,
+                                                               BasicDeviceConfig.class);
+            config.driver(DRIVER_NAME);
+            configService.applyConfig(deviceId, BasicDeviceConfig.class, config.node());
+            // Add Bridge
+            VtnConfig.applyBridgeConfig(handler, dpid, EX_PORT_NAME);
+            log.info("A new ovs is created in node {}", localIp.toString());
+            switchesOfController.put(localIp, true);
+        }
+        // Create tunnel in br-int on all controllers
+        programTunnelConfig(controllerDeviceId, localIp, handler);
+    }
+
+    @Override
+    public void onControllerVanished(Device controllerDevice) {
+        if (controllerDevice == null) {
+            log.error("The device is null");
+            return;
+        }
+        String dstIp = controllerDevice.annotations().value(CONTROLLER_IP_KEY);
+        IpAddress dstIpAddress = IpAddress.valueOf(dstIp);
+        DeviceId controllerDeviceId = controllerDevice.id();
+        if (mastershipService.isLocalMaster(controllerDeviceId)) {
+            switchesOfController.remove(dstIpAddress);
+        }
+        // remove tunnel in br-int on other controllers
+        programTunnelConfig(controllerDeviceId, dstIpAddress, null);
+    }
+
+    @Override
+    public void onOvsDetected(Device device) {
+        // Create tunnel out flow rules
+        applyTunnelOut(device, Objective.Operation.ADD);
+    }
+
+    @Override
+    public void onOvsVanished(Device device) {
+        // Remove Tunnel out flow rules
+        applyTunnelOut(device, Objective.Operation.REMOVE);
+    }
+
+    @Override
+    public void onHostDetected(Host host) {
+        // apply L2 openflow rules
+        applyHostMonitoredL2Rules(host, Objective.Operation.ADD);
+    }
+
+    @Override
+    public void onHostVanished(Host host) {
+        // apply L2 openflow rules
+        applyHostMonitoredL2Rules(host, Objective.Operation.REMOVE);
+    }
+
+    private void programTunnelConfig(DeviceId localDeviceId, IpAddress localIp,
+                                     DriverHandler localHandler) {
+        Iterable<Device> devices = deviceService.getAvailableDevices();
+        Sets.newHashSet(devices).stream()
+                .filter(d -> Device.Type.CONTROLLER == d.type())
+                .filter(d -> !localDeviceId.equals(d.id())).forEach(d -> {
+                    DriverHandler tunHandler = driverService
+                            .createHandler(d.id());
+                    String remoteIpAddress = d.annotations()
+                            .value(CONTROLLER_IP_KEY);
+                    IpAddress remoteIp = IpAddress.valueOf(remoteIpAddress);
+                    if (remoteIp.toString()
+                            .equalsIgnoreCase(localIp.toString())) {
+                        log.error("The localIp and remoteIp are the same");
+                        return;
+                    }
+                    if (localHandler != null) {
+                        // Create tunnel in br-int on local controller
+                        if (mastershipService.isLocalMaster(localDeviceId)) {
+                            VtnConfig.applyTunnelConfig(localHandler, localIp, remoteIp);
+                            log.info("Add tunnel between {} and {}", localIp,
+                                     remoteIp);
+                        }
+                        // Create tunnel in br-int on other controllers
+                        if (mastershipService.isLocalMaster(d.id())) {
+                            VtnConfig.applyTunnelConfig(tunHandler, remoteIp,
+                                                        localIp);
+                            log.info("Add tunnel between {} and {}", remoteIp,
+                                     localIp);
+                        }
+                    } else {
+                        // remove tunnel in br-int on other controllers
+                        if (mastershipService.isLocalMaster(d.id())) {
+                            VtnConfig.removeTunnelConfig(tunHandler, remoteIp,
+                                                        localIp);
+                            log.info("Remove tunnel between {} and {}", remoteIp,
+                                     localIp);
+                        }
+                    }
+                });
+    }
+
+    private void applyTunnelOut(Device device, Objective.Operation type) {
+        if (device == null) {
+            log.error("The device is null");
+            return;
+        }
+        if (!mastershipService.isLocalMaster(device.id())) {
+            return;
+        }
+        String controllerIp = VtnData.getControllerIpOfSwitch(device);
+        if (controllerIp == null) {
+            log.error("Can't find controller of device: {}",
+                      device.id().toString());
+            return;
+        }
+        IpAddress ipAddress = IpAddress.valueOf(controllerIp);
+        if (!switchesOfController.containsKey(ipAddress)) {
+            log.error("Can't find controller of device: {}",
+                      device.id().toString());
+            return;
+        }
+        if (type == Objective.Operation.ADD) {
+            switchOfLocalHostPorts.put(device.id(), new NetworkOfLocalHostPorts());
+        } else if (type == Objective.Operation.REMOVE) {
+            switchOfLocalHostPorts.remove(device.id());
+        }
+        Iterable<Device> devices = deviceService.getAvailableDevices();
+        DeviceId localControllerId = VtnData.getControllerId(device, devices);
+        DriverHandler handler = driverService.createHandler(localControllerId);
+        Set<PortNumber> ports = VtnConfig.getPortNumbers(handler);
+        Iterable<Host> allHosts = hostService.getHosts();
+        if (allHosts != null) {
+            Sets.newHashSet(allHosts).stream().forEach(host -> {
+                MacAddress hostMac = host.mac();
+                String ifaceId = host.annotations().value(IFACEID);
+                if (ifaceId == null) {
+                    log.error("The ifaceId of Host is null");
+                    return;
+                }
+                VirtualPortId virtualPortId = VirtualPortId.portId(ifaceId);
+                VirtualPort virtualPort = virtualPortService
+                        .getPort(virtualPortId);
+                TenantNetwork network = tenantNetworkService
+                        .getNetwork(virtualPort.networkId());
+                SegmentationId segmentationId = network.segmentationId();
+                DeviceId remoteDeviceId = host.location().deviceId();
+                Device remoteDevice = deviceService.getDevice(remoteDeviceId);
+                String remoteControllerIp = VtnData
+                        .getControllerIpOfSwitch(remoteDevice);
+                if (remoteControllerIp == null) {
+                    log.error("Can't find remote controller of device: {}",
+                              remoteDeviceId.toString());
+                    return;
+                }
+                IpAddress remoteIpAddress = IpAddress
+                        .valueOf(remoteControllerIp);
+                String tunnelName = "vxlan-" + remoteIpAddress.toString();
+                ports.stream()
+                        .filter(p -> p.name().equalsIgnoreCase(tunnelName))
+                        .forEach(p -> {
+                    l2ForwardService
+                            .programTunnelOut(device.id(), segmentationId, p,
+                                              hostMac, type);
+                });
+            });
+        }
+    }
+
+    private void applyHostMonitoredL2Rules(Host host, Objective.Operation type) {
+        DeviceId deviceId = host.location().deviceId();
+        if (!mastershipService.isLocalMaster(deviceId)) {
+            return;
+        }
+        String ifaceId = host.annotations().value(IFACEID);
+        if (ifaceId == null) {
+            log.error("The ifaceId of Host is null");
+            return;
+        }
+        VirtualPortId virtualPortId = VirtualPortId.portId(ifaceId);
+        VirtualPort virtualPort = virtualPortService.getPort(virtualPortId);
+        if (virtualPort == null) {
+            log.error("The virtualPort of host is null");
+            return;
+        }
+
+        Iterable<Device> devices = deviceService.getAvailableDevices();
+        PortNumber inPort = host.location().port();
+        MacAddress mac = host.mac();
+        Device device = deviceService.getDevice(deviceId);
+        String controllerIp = VtnData.getControllerIpOfSwitch(device);
+        IpAddress ipAddress = IpAddress.valueOf(controllerIp);
+        TenantNetwork network = tenantNetworkService.getNetwork(virtualPort.networkId());
+        if (network == null) {
+            log.error("Can't find network of the host");
+            return;
+        }
+        SegmentationId segmentationId = network.segmentationId();
+        // Get all the tunnel PortNumber in the current node
+        Iterable<Port> ports = deviceService.getPorts(deviceId);
+        Collection<PortNumber> localTunnelPorts = VtnData.getLocalTunnelPorts(ports);
+        // Get all the local vm's PortNumber in the current node
+        Map<TenantNetworkId, Set<PortNumber>> localHostPorts = switchOfLocalHostPorts
+                .get(deviceId).value().getNetworkOfLocalHostPorts();
+        Set<PortNumber> networkOflocalHostPorts = localHostPorts.get(network.id());
+
+        l2ForwardService.programLocalBcastRules(deviceId, segmentationId,
+                                                inPort, networkOflocalHostPorts,
+                                                localTunnelPorts,
+                                                type);
+
+        l2ForwardService.programLocalOut(deviceId, segmentationId, inPort, mac,
+                                         type);
+
+        if (type == Objective.Operation.ADD) {
+            if (networkOflocalHostPorts == null) {
+                networkOflocalHostPorts = new HashSet<PortNumber>();
+                localHostPorts.putIfAbsent(network.id(), networkOflocalHostPorts);
+            }
+            networkOflocalHostPorts.add(inPort);
+            classifierService.programTunnelIn(deviceId, segmentationId,
+                                              localTunnelPorts,
+                                              type);
+        } else if (type == Objective.Operation.REMOVE) {
+            networkOflocalHostPorts.remove(inPort);
+            if (networkOflocalHostPorts.isEmpty()) {
+                classifierService.programTunnelIn(deviceId, segmentationId,
+                                                  localTunnelPorts,
+                                                  Objective.Operation.REMOVE);
+                switchOfLocalHostPorts.get(deviceId).value().getNetworkOfLocalHostPorts()
+                                            .remove(virtualPort.networkId());
+            }
+        }
+
+        l2ForwardService.programTunnelBcastRules(deviceId, segmentationId,
+                                                 networkOflocalHostPorts,
+                                                 localTunnelPorts,
+                                                 type);
+
+        programTunnelOuts(devices, ipAddress, segmentationId, mac,
+                          type);
+
+        classifierService.programLocalIn(deviceId, segmentationId, inPort, mac,
+                                         appId, type);
+    }
+
+    private void programTunnelOuts(Iterable<Device> devices,
+                                   IpAddress ipAddress,
+                                   SegmentationId segmentationId,
+                                   MacAddress dstMac,
+                                   Objective.Operation type) {
+        String tunnelName = "vxlan-" + ipAddress.toString();
+        Sets.newHashSet(devices).stream()
+                .filter(d -> d.type() == Device.Type.CONTROLLER).forEach(d -> {
+                    DriverHandler handler = driverService.createHandler(d.id());
+                    BridgeConfig bridgeConfig = handler
+                            .behaviour(BridgeConfig.class);
+                    Collection<BridgeDescription> bridgeDescriptions = bridgeConfig
+                            .getBridges();
+                    Set<PortNumber> ports = bridgeConfig.getPortNumbers();
+                    Iterator<BridgeDescription> it = bridgeDescriptions
+                            .iterator();
+                    if (it.hasNext()) {
+                        BridgeDescription sw = it.next();
+                        ports.stream()
+                                .filter(p -> p.name()
+                                        .equalsIgnoreCase(tunnelName))
+                                .forEach(p -> {
+                            l2ForwardService.programTunnelOut(sw.deviceId(),
+                                                              segmentationId, p,
+                                                              dstMac, type);
+                        });
+                    }
+                });
+    }
+
+    private class InnerDeviceListener implements DeviceListener {
+
+        @Override
+        public void event(DeviceEvent event) {
+            Device device = event.subject();
+            if (Device.Type.CONTROLLER == device.type()) {
+                if (DeviceEvent.Type.DEVICE_ADDED == event.type()) {
+                    onControllerDetected(device);
+                }
+                if (DeviceEvent.Type.DEVICE_AVAILABILITY_CHANGED == event.type()) {
+                    if (deviceService.isAvailable(device.id())) {
+                        onControllerDetected(device);
+                    } else {
+                        onControllerVanished(device);
+                    }
+                }
+            } else if (Device.Type.SWITCH == device.type()) {
+                if (DeviceEvent.Type.DEVICE_ADDED == event.type()) {
+                    onOvsDetected(device);
+                }
+                if (DeviceEvent.Type.DEVICE_AVAILABILITY_CHANGED == event.type()) {
+                    if (deviceService.isAvailable(device.id())) {
+                        onOvsDetected(device);
+                    } else {
+                        onOvsVanished(device);
+                    }
+                }
+            } else {
+                log.info("Do nothing for this device type");
+            }
+        }
+    }
+
+    private class InnerHostListener implements HostListener {
+
+        @Override
+        public void event(HostEvent event) {
+            Host host = event.subject();
+            if (HostEvent.Type.HOST_ADDED == event.type()) {
+                onHostDetected(host);
+            } else if (HostEvent.Type.HOST_REMOVED == event.type()) {
+                onHostVanished(host);
+            } else if (HostEvent.Type.HOST_UPDATED == event.type()) {
+                onHostVanished(host);
+                onHostDetected(host);
+            }
+        }
+
+    }
+
+    // Local Host Ports of Network.
+    private class NetworkOfLocalHostPorts {
+        private final Map<TenantNetworkId, Set<PortNumber>> networkOfLocalHostPorts =
+                                      new HashMap<TenantNetworkId, Set<PortNumber>>();
+
+        public Map<TenantNetworkId, Set<PortNumber>> getNetworkOfLocalHostPorts() {
+            return networkOfLocalHostPorts;
+        }
+    }
+
+}