diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
new file mode 100644
index 0000000..8477b32
--- /dev/null
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
@@ -0,0 +1,182 @@
+/*
+ * 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.virtualport.impl;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.ConcurrentHashMap;
+
+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.onosproject.net.DeviceId;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.vtnrsc.TenantId;
+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 org.slf4j.LoggerFactory;
+
+/**
+ * Provides implementation of the VirtualPort APIs.
+ */
+@Component(immediate = true)
+@Service
+public class VirtualPortManager implements VirtualPortService {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private static final String VIRTUALPORT_ID_NULL = "VirtualPort ID cannot be null";
+    private static final String VIRTUALPORT_NOT_NULL = "VirtualPort  cannot be null";
+    private static final String TENANTID_NOT_NULL = "TenantId  cannot be null";
+    private static final String NETWORKID_NOT_NULL = "NetworkId  cannot be null";
+    private static final String DEVICEID_NOT_NULL = "DeviceId  cannot be null";
+
+    protected ConcurrentHashMap<VirtualPortId, VirtualPort> vPortStore =
+            new ConcurrentHashMap<>();
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected TenantNetworkService networkService;
+
+    @Activate
+    public void activate() {
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        vPortStore.clear();
+        log.info("Stoppped");
+    }
+
+    @Override
+    public boolean exists(VirtualPortId vPortId) {
+        checkNotNull(vPortId, VIRTUALPORT_ID_NULL);
+        return vPortStore.containsKey(vPortId);
+    }
+
+    @Override
+    public VirtualPort getPort(VirtualPortId vPortId) {
+        checkNotNull(vPortId, VIRTUALPORT_ID_NULL);
+        return vPortStore.get(vPortId);
+    }
+
+    @Override
+    public Collection<VirtualPort> getPorts() {
+        return Collections.unmodifiableCollection(vPortStore.values());
+    }
+
+    @Override
+    public Collection<VirtualPort> getPorts(TenantNetworkId networkId) {
+        checkNotNull(networkId, NETWORKID_NOT_NULL);
+        Collection<VirtualPort> vPortWithNetworkIds = vPortStore.values();
+        for (VirtualPort vPort : vPortWithNetworkIds) {
+            if (!vPort.networkId().equals(networkId)) {
+                vPortWithNetworkIds.remove(vPort);
+            }
+        }
+        return vPortWithNetworkIds;
+    }
+
+    @Override
+    public Collection<VirtualPort> getPorts(TenantId tenantId) {
+        checkNotNull(tenantId, TENANTID_NOT_NULL);
+        Collection<VirtualPort> vPortWithTenantIds = vPortStore.values();
+        for (VirtualPort vPort : vPortWithTenantIds) {
+            if (!vPort.tenantId().equals(tenantId)) {
+                vPortWithTenantIds.remove(vPort);
+            }
+        }
+        return vPortWithTenantIds;
+    }
+
+    @Override
+    public Collection<VirtualPort> getPorts(DeviceId deviceId) {
+        checkNotNull(deviceId, DEVICEID_NOT_NULL);
+        Collection<VirtualPort> vPortWithDeviceIds = vPortStore.values();
+        for (VirtualPort vPort : vPortWithDeviceIds) {
+            if (!vPort.deviceId().equals(deviceId)) {
+                vPortWithDeviceIds.remove(vPort);
+            }
+        }
+        return vPortWithDeviceIds;
+    }
+
+    @Override
+    public boolean createPorts(Iterable<VirtualPort> vPorts) {
+        checkNotNull(vPorts, VIRTUALPORT_NOT_NULL);
+        for (VirtualPort vPort : vPorts) {
+            log.debug("vPortId is  {} ", vPort.portId().toString());
+            vPortStore.put(vPort.portId(), vPort);
+            if (!vPortStore.containsKey(vPort.portId())) {
+                log.debug("The virtualPort is created failed whose identifier is {} ",
+                          vPort.portId().toString());
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean updatePorts(Iterable<VirtualPort> vPorts) {
+        checkNotNull(vPorts, VIRTUALPORT_NOT_NULL);
+        if (vPorts != null) {
+            for (VirtualPort vPort : vPorts) {
+                vPortStore.put(vPort.portId(), vPort);
+                if (!vPortStore.containsKey(vPort.portId())) {
+                    log.debug("The virtualPort is not exist whose identifier is {}",
+                              vPort.portId().toString());
+                    return false;
+                }
+
+                vPortStore.put(vPort.portId(), vPort);
+
+                if (!vPort.equals(vPortStore.get(vPort.portId()))) {
+                    log.debug("The virtualPort is updated failed whose  identifier is {}",
+                              vPort.portId().toString());
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean removePorts(Iterable<VirtualPortId> vPortIds) {
+        checkNotNull(vPortIds, VIRTUALPORT_ID_NULL);
+        if (vPortIds != null) {
+            for (VirtualPortId vPortId : vPortIds) {
+                vPortStore.remove(vPortId);
+                if (vPortStore.containsKey(vPortId)) {
+                    log.debug("The virtualPort is removed failed whose identifier is {}",
+                              vPortId.toString());
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+}