diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackArpHandler.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackArpHandler.java
index f281e4a..944d12a 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackArpHandler.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackArpHandler.java
@@ -28,7 +28,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import java.nio.ByteBuffer;
-import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Handles ARP packet from VMs.
@@ -38,16 +39,16 @@
     private static Logger log = LoggerFactory
             .getLogger(OpenstackArpHandler.class);
     private PacketService packetService;
-    private Map<String, OpenstackPort> openstackPortMap;
+    private OpenstackRestHandler restHandler;
 
     /**
      * Returns OpenstackArpHandler reference.
      *
-     * @param openstackPortMap
-     * @param packetService
+     * @param restHandler rest API handler reference
+     * @param packetService PacketService reference
      */
-    public OpenstackArpHandler(Map<String, OpenstackPort> openstackPortMap, PacketService packetService) {
-        this.openstackPortMap = openstackPortMap;
+    public OpenstackArpHandler(OpenstackRestHandler restHandler, PacketService packetService) {
+        this.restHandler = checkNotNull(restHandler);
         this.packetService = packetService;
     }
 
@@ -68,8 +69,9 @@
             //Searches the Dst MAC Address based on openstackPortMap
             MacAddress macAddress = null;
 
-            OpenstackPort openstackPort = openstackPortMap.values().stream().filter(e -> e.fixedIps().
-                    containsValue(Ip4Address.valueOf(dstIPAddress))).findAny().orElse(null);
+            OpenstackPort openstackPort = restHandler.getPorts().stream().
+                    filter(e -> e.fixedIps().containsValue(Ip4Address.valueOf(
+                            dstIPAddress))).findAny().orElse(null);
 
             if (openstackPort != null) {
                 macAddress = openstackPort.macAddress();
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackRestHandler.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackRestHandler.java
new file mode 100644
index 0000000..9065bc5
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackRestHandler.java
@@ -0,0 +1,179 @@
+/*
+ * 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.openstackswitching;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Lists;
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.WebResource;
+import org.onosproject.openstackswitching.web.OpenstackNetworkCodec;
+import org.onosproject.openstackswitching.web.OpenstackPortCodec;
+import org.onosproject.openstackswitching.web.OpenstackSubnetCodec;
+import org.slf4j.Logger;
+import javax.ws.rs.core.MediaType;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.net.MediaType.JSON_UTF_8;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Handles REST Calls to Openstack Neutron.
+ *
+ */
+public class OpenstackRestHandler {
+
+    private final Logger log = getLogger(getClass());
+    private String neutronUrl;
+    private String keystoneUrl;
+    private String tokenId;
+    private String userName;
+    private String pass;
+
+    /**
+     * Creates OpenstackRestHandler instance.
+     *
+     * @param cfg OpenstackSwitchingConfig reference
+     */
+    public OpenstackRestHandler(OpenstackSwitchingConfig cfg) {
+        this.neutronUrl = checkNotNull(cfg.neutronServer());
+        this.keystoneUrl = checkNotNull(cfg.keystoneServer());
+        this.userName = checkNotNull(cfg.userName());
+        this.pass = checkNotNull(cfg.password());
+    }
+
+    /**
+     * Returns network information stored in Neutron.
+     *
+     * @return List of OpenstackNetwork
+     */
+    public Collection<OpenstackNetwork> getNetworks() {
+
+        WebResource.Builder builder = getClientBuilder(neutronUrl + "networks");
+        String response = builder.accept(MediaType.APPLICATION_JSON_TYPE).
+                header("X-Auth-Token", getToken()).get(String.class);
+
+        ObjectMapper mapper = new ObjectMapper();
+        List<OpenstackNetwork> openstackNetworks = Lists.newArrayList();
+        try {
+            ObjectNode node = (ObjectNode) mapper.readTree(response);
+            ArrayNode networkList = (ArrayNode) node.path("networks");
+            OpenstackNetworkCodec networkCodec = new OpenstackNetworkCodec();
+            networkList.forEach(n -> openstackNetworks.add(networkCodec.decode((ObjectNode) n, null)));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        log.debug("networks response:" + response);
+        openstackNetworks.forEach(n -> log.debug("network ID: {}", n.id()));
+
+        return openstackNetworks;
+    }
+
+    /**
+     * Returns port information stored in Neutron.
+     *
+     * @return List of OpenstackPort
+     */
+    public Collection<OpenstackPort> getPorts() {
+
+        WebResource.Builder builder = getClientBuilder(neutronUrl + "ports");
+        String response = builder.accept(MediaType.APPLICATION_JSON_TYPE).
+                header("X-Auth-Token", getToken()).get(String.class);
+
+        ObjectMapper mapper = new ObjectMapper();
+        List<OpenstackPort> openstackPorts = Lists.newArrayList();
+        try {
+            ObjectNode node = (ObjectNode) mapper.readTree(response);
+            ArrayNode portList = (ArrayNode) node.path("ports");
+            OpenstackPortCodec portCodec = new OpenstackPortCodec();
+            portList.forEach(p -> openstackPorts.add(portCodec.decode((ObjectNode) p, null)));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        log.debug("port response:" + response);
+        openstackPorts.forEach(n -> log.debug("port ID: {}", n.id()));
+
+        return openstackPorts;
+    }
+
+    /**
+     * Returns Subnet information in Neutron.
+     *
+     * @return List of OpenstackSubnet
+     */
+    public Collection<OpenstackSubnet> getSubnets() {
+
+        WebResource.Builder builder = getClientBuilder(neutronUrl + "subnets");
+        String response = builder.accept(MediaType.APPLICATION_JSON_TYPE).
+                header("X-Auth-Token", getToken()).get(String.class);
+
+        ObjectMapper mapper = new ObjectMapper();
+        List<OpenstackSubnet> subnets = Lists.newArrayList();
+        try {
+            ObjectNode node = (ObjectNode) mapper.readTree(response);
+            ArrayNode subnetList = (ArrayNode) node.path("subnets");
+            OpenstackSubnetCodec subnetCodec = new OpenstackSubnetCodec();
+            subnetList.forEach(s -> subnets.add(subnetCodec.decode((ObjectNode) s, null)));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        log.debug("subnets response:" + response);
+        subnets.forEach(s -> log.debug("subnet ID: {}", s.id()));
+
+        return subnets;
+    }
+
+    private WebResource.Builder getClientBuilder(String uri) {
+        Client client = Client.create();
+        WebResource resource = client.resource(uri);
+        return resource.accept(JSON_UTF_8.toString())
+                .type(JSON_UTF_8.toString());
+    }
+
+    private String getToken() {
+        if (isTokenInvalid()) {
+            String request = "{\"auth\": {\"tenantName\": \"admin\", " +
+                    "\"passwordCredentials\":  {\"username\": \"" +
+                    userName + "\",\"password\": \"" + pass + "\"}}}";
+            WebResource.Builder builder = getClientBuilder(keystoneUrl + "tokens");
+            String response = builder.accept(MediaType.APPLICATION_JSON).post(String.class, request);
+
+            ObjectMapper mapper = new ObjectMapper();
+            try {
+                ObjectNode node = (ObjectNode) mapper.readTree(response);
+                tokenId = node.path("access").path("token").path("id").asText();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            log.debug("token response:" + response);
+        }
+
+        return tokenId;
+    }
+
+    private boolean isTokenInvalid() {
+        //TODO: validation check for the existing token
+        return true;
+    }
+
+}
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingConfig.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingConfig.java
index 12a9c2c..ba39ff6 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingConfig.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingConfig.java
@@ -24,6 +24,10 @@
  */
 public class OpenstackSwitchingConfig extends Config<ApplicationId> {
     public static final String DONOTPUSH = "do_not_push_flows";
+    public static final String NEUTRON_SERVER = "neutron_server";
+    public static final String KEYSTONE_SERVER = "keystone_server";
+    public static final String USER_NAME = "user_name";
+    public static final String PASSWORD = "password";
 
     /**
      * Returns the flag whether the app pushes flows or not.
@@ -36,6 +40,42 @@
     }
 
     /**
+     * Returns the Neutron server IP address.
+     *
+     * @return Neutron server IP
+     */
+    public String neutronServer() {
+        return get(NEUTRON_SERVER, "");
+    }
+
+    /**
+     * Returns the Keystone server IP address.
+     *
+     * @return Keystone server IP
+     */
+    public String keystoneServer() {
+        return get(KEYSTONE_SERVER, "");
+    }
+
+    /**
+     * Returns the username for openstack.
+     *
+     * @return username for openstack
+     */
+    public String userName() {
+        return get(USER_NAME, "");
+    }
+
+    /**
+     * Returns the password for openstack.
+     *
+     * @return password for openstack
+     */
+    public String password() {
+        return get(PASSWORD, "");
+    }
+
+    /**
      * Sets the flag whether the app pushes flows or not.
      *
      * @param flag the flag whether the app pushes flows or not
@@ -44,4 +84,44 @@
     public BasicElementConfig doNotPushFlows(boolean flag) {
         return (BasicElementConfig) setOrClear(DONOTPUSH, flag);
     }
+
+    /**
+     * Sets the neutron server IP address.
+     *
+     * @param url neutron server IP address
+     * @return itself
+     */
+    public BasicElementConfig neutronServer(String url) {
+        return (BasicElementConfig) setOrClear(NEUTRON_SERVER, url);
+    }
+
+    /**
+     * Sets the keystone server IP address.
+     *
+     * @param url keystone server IP address
+     * @return itself
+     */
+    public BasicElementConfig keystoneServer(String url) {
+        return (BasicElementConfig) setOrClear(KEYSTONE_SERVER, url);
+    }
+
+    /**
+     * Sets the username for openstack.
+     *
+     * @param username user name for openstack
+     * @return itself
+     */
+    public BasicElementConfig userName(String username) {
+        return (BasicElementConfig) setOrClear(USER_NAME, username);
+    }
+
+    /**
+     * Sets the password for openstack.
+     *
+     * @param password password for openstack
+     * @return itself
+     */
+    public BasicElementConfig password(String password) {
+        return (BasicElementConfig) setOrClear(PASSWORD, password);
+    }
 }
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingManager.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingManager.java
index 0e7ebac..d881d81 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingManager.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingManager.java
@@ -17,7 +17,6 @@
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -26,8 +25,6 @@
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.packet.Ethernet;
 import org.onlab.packet.Ip4Address;
-import org.onlab.packet.Ip4Prefix;
-import org.onlab.packet.MacAddress;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.dhcp.DhcpService;
@@ -41,6 +38,7 @@
 import org.onosproject.net.device.DeviceEvent;
 import org.onosproject.net.device.DeviceListener;
 import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.driver.DriverService;
 import org.onosproject.net.flowobjective.FlowObjectiveService;
 import org.onosproject.net.packet.InboundPacket;
 import org.onosproject.net.packet.PacketContext;
@@ -49,7 +47,6 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import java.util.List;
-import java.util.Map;
 import java.util.Collection;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
@@ -82,18 +79,23 @@
     protected FlowObjectiveService flowObjectiveService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DhcpService dhcpService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected NetworkConfigRegistry cfgService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected DhcpService dhcpService;
-
-    public static final int DHCP_PORT = 67;
+    protected DriverService driverService;
 
     private ApplicationId appId;
     private boolean doNotPushFlows;
+    private Ip4Address neutronServer;
+    private Ip4Address keystoneServer;
+    private String userName;
+    private String password;
     private OpenstackArpHandler arpHandler;
+    private OpenstackRestHandler restHandler;
 
-    private OpenstackSwitchingRulePopulator rulePopulator;
     private ExecutorService deviceEventExcutorService = Executors.newFixedThreadPool(10);
 
     private InternalPacketProcessor internalPacketProcessor = new InternalPacketProcessor();
@@ -109,38 +111,18 @@
                 }
             }
     );
-    // Map <port_id, OpenstackPort>
-    private Map<String, OpenstackPort> openstackPortMap;
-    // Map <network_id, OpenstackNetwork>
-    private Map<String, OpenstackNetwork> openstackNetworkMap;
-    // Map <subnet_id, OpenstackSubner>
-    private Map<String, OpenstackSubnet> openstackSubnetMap;
-    // Map <vni, List <Entry <portName, host ip>>
-    private Map<String, List<PortInfo>> vniPortMap;
-    private Map<Ip4Address, Port> tunnelPortMap;
-
 
     @Activate
     protected void activate() {
         appId = coreService
                 .registerApplication("org.onosproject.openstackswitching");
+
+        factories.forEach(cfgService::registerConfigFactory);
         packetService.addProcessor(internalPacketProcessor, PacketProcessor.director(1));
         deviceService.addListener(internalDeviceListener);
         cfgService.addListener(internalConfigListener);
-        factories.forEach(cfgService::registerConfigFactory);
-        OpenstackSwitchingConfig cfg =
-                cfgService.getConfig(appId, OpenstackSwitchingConfig.class);
-        if (cfg != null) {
-            doNotPushFlows = cfg.doNotPushFlows();
-        }
-        openstackPortMap = Maps.newHashMap();
-        openstackNetworkMap = Maps.newHashMap();
-        openstackSubnetMap = Maps.newHashMap();
 
-        vniPortMap = Maps.newHashMap();
-        tunnelPortMap = Maps.newHashMap();
-
-        arpHandler = new OpenstackArpHandler(openstackPortMap, packetService);
+        internalConfigListener.configureNetwork();
 
         log.info("Started");
     }
@@ -159,7 +141,6 @@
     @Override
     public void createPorts(OpenstackPort openstackPort) {
         registerDhcpInfo(openstackPort);
-        openstackPortMap.put(openstackPort.id(), openstackPort);
     }
 
     @Override
@@ -174,19 +155,16 @@
 
     @Override
     public void createNetwork(OpenstackNetwork openstackNetwork) {
-        openstackNetworkMap.put(openstackNetwork.id(), openstackNetwork);
     }
 
     @Override
     public void createSubnet(OpenstackSubnet openstackSubnet) {
-        openstackSubnetMap.put(openstackSubnet.id(), openstackSubnet);
-        log.debug("Added Subnet Info {}", openstackNetworkMap.get(openstackSubnet.id()));
     }
 
     @Override
     public Collection<OpenstackPort> ports(String networkId) {
-
-        List<OpenstackPort> portList = openstackPortMap.values().stream()
+        Collection<OpenstackPort> ports = restHandler.getPorts();
+        List<OpenstackPort> portList = ports.stream()
                 .filter(p -> p.networkId().equals(networkId))
                 .collect(Collectors.toList());
 
@@ -194,47 +172,46 @@
     }
 
     @Override
-    public OpenstackPort port(String portName) {
-        String uuid = portName.substring(3);
-        return (OpenstackPort) openstackPortMap.values().stream()
+    public OpenstackPort port(Port port) {
+        Collection<OpenstackPort> ports = restHandler.getPorts();
+        String uuid = port.annotations().value("portName").substring(3);
+        return ports.stream()
                 .filter(p -> p.id().startsWith(uuid))
-                .findFirst().get().clone();
+                .findFirst().orElse(null);
+    }
+
+    @Override
+    public OpenstackPort port(String portId) {
+        Collection<OpenstackPort> ports = restHandler.getPorts();
+        return ports.stream()
+                .filter(p -> p.id().equals(portId))
+                .findFirst().orElse(null);
     }
 
     @Override
     public OpenstackNetwork network(String networkId) {
-        OpenstackNetwork on = null;
-        try {
-            on = (OpenstackNetwork) openstackNetworkMap.get(networkId).clone();
-        } catch (CloneNotSupportedException e) {
-            log.error("Cloning is not supported {}", e);
-        }
-        return on;
+        Collection<OpenstackNetwork> networks = restHandler.getNetworks();
+        return networks.stream()
+                .filter(n -> n.id().equals(networkId))
+                .findFirst().orElse(null);
     }
 
     private void processDeviceAdded(Device device) {
         log.debug("device {} is added", device.id());
-        rulePopulator.populateDefaultRules(device.id());
     }
 
     private void processPortAdded(Device device, Port port) {
-        // TODO: Simplify the data structure to store the network info
-        // TODO: Make it stateless
-        // TODO: All the logics need to be processed inside of the rulePopulator class
-        synchronized (vniPortMap) {
-            log.debug("port {} is updated", port.toString());
-
-            updatePortMaps(device, port);
-            if (!port.annotations().value("portName").equals("vxlan")) {
-                populateFlowRulesForTrafficToSameCnode(device, port);
-                populateFlowRulesForTrafficToDifferentCnode(device, port);
-            }
+        if (!port.annotations().value("portName").equals("vxlan")) {
+            OpenstackSwitchingRulePopulator rulePopulator =
+                    new OpenstackSwitchingRulePopulator(appId, flowObjectiveService,
+                            deviceService, restHandler, driverService);
+            rulePopulator.populateSwitchingRules(device, port);
         }
     }
 
     private void processPortRemoved(Device device, Port port) {
+        // TODO: Remove flow rules for the VM removed
         log.debug("port {} is removed", port.toString());
-        // TODO: need to update the vniPortMap
     }
 
     private void registerDhcpInfo(OpenstackPort openstackPort) {
@@ -247,7 +224,7 @@
 
         ip4Address = (Ip4Address) openstackPort.fixedIps().values().toArray()[0];
 
-        openstackSubnet = openstackSubnetMap.values().stream()
+        openstackSubnet = restHandler.getSubnets().stream()
                 .filter(n -> n.networkId().equals(openstackPort.networkId()))
                 .findFirst().get();
 
@@ -280,180 +257,7 @@
         return bytes;
     }
 
-    /**
-     * Populates the flow rules for traffic to VMs in different Cnode using
-     * Nicira extention.
-     *
-     * @param device device to put rules
-     * @param port port information of the VM
-     */
-    private void populateFlowRulesForTrafficToDifferentCnode(Device device, Port port) {
-        String portName = port.annotations().value("portName");
-        String channelId = device.annotations().value("channelId");
-        Ip4Address hostIpAddress = Ip4Address.valueOf(channelId.split(":")[0]);
-        Ip4Address fixedIp = getFixedIpAddressForPort(portName);
-        // TODO: Avoid duplicate flow rule set up for VMs in other Cnode
-        //       (possibly avoided by flowrule subsystem?)
-        if (tunnelPortMap.get(hostIpAddress) == null) {
-            log.debug("There is no tunnel port information");
-            return;
-        }
-        String vni = getVniForPort(portName);
-        MacAddress vmMac = getVmMacAddressForPort(portName);
-        if (!vniPortMap.isEmpty() && vniPortMap.get(vni) != null) {
-            for (PortInfo portInfo : vniPortMap.get(vni)) {
-                if (!portInfo.portName.equals(portName) &&
-                        !portInfo.hostIp.equals(hostIpAddress)) {
-                    MacAddress vmMacx = getVmMacAddressForPort(portInfo.portName);
-                    rulePopulator.populateForwardingRuleForOtherCnode(vni,
-                            device.id(), portInfo.hostIp, portInfo.fixedIp, vmMacx,
-                            tunnelPortMap.get(hostIpAddress).number(),
-                            portInfo.deviceId, hostIpAddress, fixedIp, vmMac,
-                            tunnelPortMap.get(portInfo.hostIp).number());
-                }
-            }
-        }
-    }
 
-    /**
-     * Populates the flow rules for traffic to VMs in the same Cnode as the sender.
-     *
-     * @param device device to put the rules
-     * @param port port info of the VM
-     */
-    private void populateFlowRulesForTrafficToSameCnode(Device device, Port port) {
-        Ip4Prefix cidr = getCidrForPort(port.annotations().value("portName"));
-        Ip4Address vmIp = getFixedIpAddressForPort(port.annotations().value("portName"));
-        if (vmIp != null) {
-            rulePopulator.populateForwardingRule(vmIp, device.id(), port, cidr);
-        }
-    }
-
-    /**
-     * Updates the port maps using the port information.
-     *
-     * @param device device info
-     * @param port port of the VM
-     */
-    private void updatePortMaps(Device device, Port port) {
-        String portName = port.annotations().value("portName");
-        String channelId = device.annotations().value("channelId");
-        Ip4Address hostIpAddress = Ip4Address.valueOf(channelId.split(":")[0]);
-        if (portName.startsWith("vxlan")) {
-            tunnelPortMap.put(hostIpAddress, port);
-        } else {
-            String vni = getVniForPort(portName);
-            Ip4Address fixedIp = getFixedIpAddressForPort(portName);
-            if (vniPortMap.get(vni) == null) {
-                vniPortMap.put(vni, Lists.newArrayList());
-            }
-            vniPortMap.get(vni).add(new PortInfo(device.id(), portName, fixedIp, hostIpAddress));
-        }
-    }
-
-    /**
-     * Returns CIDR information from the subnet map for the port.
-     *
-     * @param portName port name of the port of the VM
-     * @return CIDR of the VNI of the VM
-     */
-    private Ip4Prefix getCidrForPort(String portName) {
-        String networkId = null;
-        String uuid = portName.substring(3);
-        OpenstackPort port = openstackPortMap.values().stream()
-                .filter(p -> p.id().startsWith(uuid))
-                .findFirst().get();
-        if (port == null) {
-            log.debug("No port information for port {}", portName);
-            return null;
-        }
-
-        OpenstackSubnet subnet = openstackSubnetMap.values().stream()
-                .filter(s -> s.networkId().equals(port.networkId()))
-                .findFirst().get();
-        if (subnet == null) {
-            log.debug("No subnet information for network {}", port.networkId());
-            return null;
-        }
-
-        return Ip4Prefix.valueOf(subnet.cidr());
-    }
-
-    /**
-     * Returns the VNI of the VM of the port.
-     *
-     * @param portName VM port
-     * @return VNI
-     */
-    private String getVniForPort(String portName) {
-        String networkId = null;
-        String uuid = portName.substring(3);
-        OpenstackPort port = openstackPortMap.values().stream()
-                .filter(p -> p.id().startsWith(uuid))
-                .findFirst().get();
-        if (port == null) {
-            log.debug("No port information for port {}", portName);
-            return null;
-        }
-        OpenstackNetwork network = openstackNetworkMap.values().stream()
-                .filter(n -> n.id().equals(port.networkId()))
-                .findFirst().get();
-        if (network == null) {
-            log.debug("No VNI information for network {}", network.id());
-            return null;
-        }
-
-        return network.segmentId();
-    }
-
-    /**
-     * Returns the Fixed IP address of the VM.
-     *
-     * @param portName VM port info
-     * @return IP address of the VM
-     */
-    private Ip4Address getFixedIpAddressForPort(String portName) {
-
-        // FIXME - For now we use the information stored from neutron Rest API call.
-        // TODO - Later, the information needs to be extracted from Neutron on-demand.
-        String uuid = portName.substring(3);
-        OpenstackPort port = openstackPortMap.values().stream()
-                        .filter(p -> p.id().startsWith(uuid))
-                        .findFirst().get();
-
-        if (port == null) {
-            log.error("There is no port information for port name {}", portName);
-            return null;
-        }
-
-        if (port.fixedIps().isEmpty()) {
-            log.error("There is no fixed IP info in the port information");
-            return null;
-        }
-
-        return (Ip4Address) port.fixedIps().values().toArray()[0];
-    }
-
-    /**
-     * Returns the MAC address of the VM of the port.
-     *
-     * @param portName VM port
-     * @return MAC address of the VM
-     */
-    private MacAddress getVmMacAddressForPort(String portName) {
-
-        String uuid = portName.substring(3);
-        OpenstackPort port = openstackPortMap.values().stream()
-                .filter(p -> p.id().startsWith(uuid))
-                .findFirst().get();
-
-        if (port == null) {
-            log.error("There is no mac information for port name {}", portName);
-            return null;
-        }
-
-        return port.macAddress();
-    }
 
     private class InternalPacketProcessor implements PacketProcessor {
 
@@ -529,20 +333,28 @@
 
     private class InternalConfigListener implements NetworkConfigListener {
 
+        public void configureNetwork() {
+            OpenstackSwitchingConfig cfg =
+                    cfgService.getConfig(appId, OpenstackSwitchingConfig.class);
+            if (cfg == null) {
+                log.error("There is no openstack server information in config.");
+                return;
+            }
+            doNotPushFlows = cfg.doNotPushFlows();
+            restHandler = new OpenstackRestHandler(cfg);
+            arpHandler = new OpenstackArpHandler(restHandler, packetService);
+        }
+
         @Override
         public void event(NetworkConfigEvent event) {
             if (((event.type() == NetworkConfigEvent.Type.CONFIG_ADDED ||
             event.type() == NetworkConfigEvent.Type.CONFIG_UPDATED)) &&
                     event.configClass().equals(OpenstackSwitchingConfig.class)) {
-                OpenstackSwitchingConfig cfg = cfgService.getConfig(appId,
-                        OpenstackSwitchingConfig.class);
-                if (cfg != null) {
-                    doNotPushFlows = cfg.doNotPushFlows();
-                    log.info("Switching mode reconfigured");
-                }
+               configureNetwork();
             }
         }
-   }
+
+    }
 
     private final class PortInfo {
         DeviceId deviceId;
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingRulePopulator.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingRulePopulator.java
index fa0b7e6..c765ef4 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingRulePopulator.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingRulePopulator.java
@@ -17,25 +17,35 @@
 package org.onosproject.openstackswitching;
 
 import org.onlab.packet.Ethernet;
-import org.onlab.packet.IPv4;
 import org.onlab.packet.Ip4Address;
-import org.onlab.packet.Ip4Prefix;
 import org.onlab.packet.MacAddress;
-import org.onlab.packet.TpPort;
 import org.onosproject.core.ApplicationId;
+import org.onosproject.net.Device;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.Port;
 import org.onosproject.net.PortNumber;
+import org.onosproject.net.behaviour.ExtensionTreatmentResolver;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.driver.DefaultDriverData;
+import org.onosproject.net.driver.DefaultDriverHandler;
+import org.onosproject.net.driver.Driver;
+import org.onosproject.net.driver.DriverHandler;
+import org.onosproject.net.driver.DriverService;
 import org.onosproject.net.flow.DefaultTrafficSelector;
 import org.onosproject.net.flow.DefaultTrafficTreatment;
 import org.onosproject.net.flow.TrafficSelector;
 import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.flow.instructions.ExtensionTreatment;
+import org.onosproject.net.flow.instructions.ExtensionPropertyException;
+import org.onosproject.net.flow.instructions.ExtensionTreatmentType;
 import org.onosproject.net.flowobjective.DefaultForwardingObjective;
 import org.onosproject.net.flowobjective.FlowObjectiveService;
 import org.onosproject.net.flowobjective.ForwardingObjective;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.Collection;
+
 /**
  * Populates switching flow rules.
  */
@@ -43,123 +53,168 @@
 
     private static Logger log = LoggerFactory
             .getLogger(OpenstackSwitchingRulePopulator.class);
+    private static final int SWITCHING_RULE_PRIORITY = 50000;
 
     private FlowObjectiveService flowObjectiveService;
+    private DriverService driverService;
+    private DeviceService deviceService;
+    private OpenstackRestHandler restHandler;
     private ApplicationId appId;
 
+    private Collection<OpenstackNetwork> openstackNetworkList;
+    private Collection<OpenstackPort> openstackPortList;
+
     /**
      * Creates OpenstackSwitchingRulPopulator.
      *
      * @param appId application id
      * @param flowObjectiveService FlowObjectiveService reference
+     * @param deviceService DeviceService reference
+     * @param driverService DriverService reference
      */
     public OpenstackSwitchingRulePopulator(ApplicationId appId,
-                                           FlowObjectiveService flowObjectiveService) {
+                                           FlowObjectiveService flowObjectiveService,
+                                           DeviceService deviceService,
+                                           OpenstackRestHandler restHandler,
+                                           DriverService driverService) {
         this.flowObjectiveService = flowObjectiveService;
+        this.deviceService = deviceService;
+        this.driverService = driverService;
+        this.restHandler = restHandler;
         this.appId = appId;
+
+        openstackNetworkList = restHandler.getNetworks();
+        openstackPortList = restHandler.getPorts();
     }
 
     /**
-     * Populates flows rules for forwarding packets to and from VMs.
+     * Populates flow rules for the VM created.
      *
-     * @param ip v4 IP Address
-     * @param  id device ID
-     * @param port port
-     * @param cidr v4 IP prefix
-     * @return true if it succeeds to populate rules, false otherwise.
+     * @param device device to populate rules to
+     * @param port port for the VM created
      */
-    public boolean populateForwardingRule(Ip4Address ip, DeviceId id, Port port, Ip4Prefix cidr) {
-
-
-        setFlowRuleForVMsInSameCnode(ip, id, port, cidr);
-
-        return true;
+    public void populateSwitchingRules(Device device, Port port) {
+        populateFlowRulesForTrafficToSameCnode(device, port);
+        populateFlowRulesForTrafficToDifferentCnode(device, port);
     }
 
     /**
-     * Populates the common flows rules for all VMs.
+     * Populates the flow rules for traffic to VMs in the same Cnode as the sender.
      *
-     * - Send ARP packets to the controller
-     * - Send DHCP packets to the controller
-     *
-     * @param id Device ID to populates rules to
+     * @param device device to put the rules
+     * @param port port info of the VM
      */
-    public void populateDefaultRules(DeviceId id) {
-
-        setFlowRuleForArp(id);
-
-        log.warn("Default rule has been set");
+    private void populateFlowRulesForTrafficToSameCnode(Device device, Port port) {
+        Ip4Address vmIp = getFixedIpAddressForPort(port.annotations().value("portName"));
+        if (vmIp != null) {
+            setFlowRuleForVMsInSameCnode(vmIp, device.id(), port);
+        }
     }
 
     /**
-     * Populates the forwarding rules for VMs with the same VNI but in other Code.
+     * Populates the flow rules for traffic to VMs in different Cnode using
+     * Nicira extention.
      *
-     * @param vni VNI for the networks
-     * @param id device ID to populates the flow rules
-     * @param hostIp host IP address of the VM
-     * @param vmIp fixed IP address for the VM
-     * @param vmMac MAC address for the VM
-     * @param tunnelPort tunnel port number for the VM
-     * @param idx device ID for OVS of the other VM
-     * @param hostIpx host IP address of the other VM
-     * @param vmIpx fixed IP address of the other VM
-     * @param vmMacx MAC address for the other VM
-     * @param tunnelPortx x tunnel port number for other VM
+     * @param device device to put rules
+     * @param port port information of the VM
      */
-    public void populateForwardingRuleForOtherCnode(String vni, DeviceId id, Ip4Address hostIp,
-                                                    Ip4Address vmIp, MacAddress vmMac, PortNumber tunnelPort,
-                                                    DeviceId idx, Ip4Address hostIpx,
-                                                    Ip4Address vmIpx, MacAddress vmMacx, PortNumber tunnelPortx) {
-        setVxLanFlowRule(vni, id, hostIp, vmIp, vmMac, tunnelPort);
-        setVxLanFlowRule(vni, idx, hostIpx, vmIpx, vmMacx, tunnelPortx);
+    private void populateFlowRulesForTrafficToDifferentCnode(Device device, Port port) {
+        String portName = port.annotations().value("portName");
+        String channelId = device.annotations().value("channelId");
+        Ip4Address hostIpAddress = Ip4Address.valueOf(channelId.split(":")[0]);
+        Ip4Address fixedIp = getFixedIpAddressForPort(portName);
+        MacAddress vmMac = getVmMacAddressForPort(portName);
+        String vni = getVniForPort(portName);
+        deviceService.getAvailableDevices().forEach(d -> {
+            if (!d.equals(device)) {
+                deviceService.getPorts(d.id()).forEach(p -> {
+                    String pName = p.annotations().value("portName");
+                    if (!p.equals(port) && vni.equals(getVniForPort(pName))) {
+                        String cidx = d.annotations().value("channelId");
+                        Ip4Address hostIpx = Ip4Address.valueOf(cidx.split(":")[0]);
+                        MacAddress vmMacx = getVmMacAddressForPort(pName);
+                        Ip4Address fixedIpx = getFixedIpAddressForPort(pName);
+
+                        setVxLanFlowRule(vni, device.id(), hostIpx, fixedIpx, vmMacx);
+                        setVxLanFlowRule(vni, d.id(), hostIpAddress, fixedIp, vmMac);
+                    }
+                });
+            }
+        });
     }
 
     /**
-     * Populates the flow rules for DHCP packets from VMs.
+     * Returns the VNI of the VM of the port.
      *
-     * @param id device ID to set the rules
+     * @param portName VM port
+     * @return VNI
      */
-    private void setFlowRuleForDhcp(DeviceId id) {
-        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
-        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+    private String getVniForPort(String portName) {
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortList.stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findAny().orElse(null);
+        if (port == null) {
+            log.warn("No port information for port {}", portName);
+            return null;
+        }
 
-        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
-                .matchIPProtocol(IPv4.PROTOCOL_UDP)
-                .matchUdpDst(TpPort.tpPort(OpenstackSwitchingManager.DHCP_PORT));
-        tBuilder.setOutput(PortNumber.CONTROLLER);
+        OpenstackNetwork network = openstackNetworkList.stream()
+                .filter(n -> n.id().equals(port.networkId()))
+                .findAny().orElse(null);
+        if (network == null) {
+            log.warn("No VNI information for network {}", network.id());
+            return null;
+        }
 
-        ForwardingObjective fo = DefaultForwardingObjective.builder()
-                .withSelector(sBuilder.build())
-                .withTreatment(tBuilder.build())
-                .withPriority(5000)
-                .withFlag(ForwardingObjective.Flag.VERSATILE)
-                .fromApp(appId)
-                .add();
-
-        flowObjectiveService.forward(id, fo);
+        return network.segmentId();
     }
 
     /**
-     * Populates the flow rules for ARP packets from VMs.
+     * Returns the Fixed IP address of the VM.
      *
-     * @param id device ID to put rules.
+     * @param portName VM port info
+     * @return IP address of the VM
      */
-    private void setFlowRuleForArp(DeviceId id) {
-        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
-        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+    private Ip4Address getFixedIpAddressForPort(String portName) {
 
-        sBuilder.matchEthType(Ethernet.TYPE_ARP);
-        tBuilder.setOutput(PortNumber.CONTROLLER);
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortList.stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().orElse(null);
 
-        ForwardingObjective fo = DefaultForwardingObjective.builder()
-                .withSelector(sBuilder.build())
-                .withTreatment(tBuilder.build())
-                .withPriority(5000)
-                .withFlag(ForwardingObjective.Flag.VERSATILE)
-                .fromApp(appId)
-                .add();
+        if (port == null) {
+            log.error("There is no port information for port name {}", portName);
+            return null;
+        }
 
-        flowObjectiveService.forward(id, fo);
+        if (port.fixedIps().isEmpty()) {
+            log.error("There is no fixed IP info in the port information");
+            return null;
+        }
+
+        return (Ip4Address) port.fixedIps().values().toArray()[0];
+    }
+
+    /**
+     * Returns the MAC address of the VM of the port.
+     *
+     * @param portName VM port
+     * @return MAC address of the VM
+     */
+    private MacAddress getVmMacAddressForPort(String portName) {
+
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortList.stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().orElse(null);
+
+        if (port == null) {
+            log.error("There is port information for port name {}", portName);
+            return null;
+        }
+
+        return port.macAddress();
     }
 
     /**
@@ -168,22 +223,20 @@
      * @param ip4Address VM IP address
      * @param id device ID to put rules
      * @param port VM port
-     * @param cidr subnet info of the VMs
      */
     private void setFlowRuleForVMsInSameCnode(Ip4Address ip4Address, DeviceId id,
-                                              Port port, Ip4Prefix cidr) {
+                                              Port port) {
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
         TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
 
         sBuilder.matchEthType(Ethernet.TYPE_IPV4)
-                .matchIPDst(ip4Address.toIpPrefix())
-                .matchIPSrc(cidr);
+                .matchIPDst(ip4Address.toIpPrefix());
         tBuilder.setOutput(port.number());
 
         ForwardingObjective fo = DefaultForwardingObjective.builder()
                 .withSelector(sBuilder.build())
                 .withTreatment(tBuilder.build())
-                .withPriority(5000)
+                .withPriority(SWITCHING_RULE_PRIORITY)
                 .withFlag(ForwardingObjective.Flag.VERSATILE)
                 .fromApp(appId)
                 .add();
@@ -199,28 +252,56 @@
      * @param hostIp host IP of the VM
      * @param vmIp fixed IP of the VM
      * @param vmMac MAC address of the VM
-     * @param tunnelPort tunnel port to forward traffic to
      */
     private void setVxLanFlowRule(String vni, DeviceId id, Ip4Address hostIp,
-                                  Ip4Address vmIp, MacAddress vmMac, PortNumber tunnelPort) {
+                                  Ip4Address vmIp, MacAddress vmMac) {
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
         TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
 
         sBuilder.matchEthType(Ethernet.TYPE_IPV4)
                 .matchIPDst(vmIp.toIpPrefix());
         tBuilder.setTunnelId(Long.parseLong(vni))
-                //.setTunnelDst() <- for Nicira ext
-                //.setEthDst(vmMac)
-                .setOutput(tunnelPort);
+                .extension(buildNiciraExtenstion(id, hostIp), id)
+                .setOutput(getTunnelPort(id));
 
         ForwardingObjective fo = DefaultForwardingObjective.builder()
                 .withSelector(sBuilder.build())
                 .withTreatment(tBuilder.build())
-                .withPriority(5000)
+                .withPriority(SWITCHING_RULE_PRIORITY)
                 .withFlag(ForwardingObjective.Flag.VERSATILE)
                 .fromApp(appId)
                 .add();
 
         flowObjectiveService.forward(id, fo);
     }
+
+    private ExtensionTreatment buildNiciraExtenstion(DeviceId id, Ip4Address hostIp) {
+        Driver driver = driverService.getDriver(id);
+        DriverHandler driverHandler = new DefaultDriverHandler(new DefaultDriverData(driver, id));
+        ExtensionTreatmentResolver resolver = driverHandler.behaviour(ExtensionTreatmentResolver.class);
+
+        ExtensionTreatment extensionInstruction =
+                resolver.getExtensionInstruction(
+                        ExtensionTreatmentType.ExtensionTreatmentTypes.NICIRA_SET_TUNNEL_DST.type());
+
+        try {
+            extensionInstruction.setPropertyValue("tunnelDst", hostIp);
+        } catch (ExtensionPropertyException e) {
+            log.error("Error setting Nicira extension setting {}", e);
+        }
+
+        return  extensionInstruction;
+    }
+
+    private PortNumber getTunnelPort(DeviceId id) {
+        Port port = deviceService.getPorts(id).stream()
+                .filter(p -> p.annotations().value("portName").equals("vxlan"))
+                .findAny().orElse(null);
+
+        if (port == null) {
+            log.error("No TunnelPort was created.");
+            return null;
+        }
+        return port.number();
+    }
 }
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkCodec.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkCodec.java
index fc1509d..0a0b5dc 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkCodec.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkCodec.java
@@ -43,6 +43,9 @@
     public OpenstackNetwork decode(ObjectNode json, CodecContext context) {
 
         JsonNode networkInfo = json.get(NETWORK);
+        if (networkInfo == null) {
+            networkInfo = json;
+        }
 
         String name = networkInfo.path(NAME).asText();
         String tenantId = networkInfo.path(TENANT_ID).asText();
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkWebResource.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkWebResource.java
index f4c401f..bf04cc4 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkWebResource.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkWebResource.java
@@ -15,48 +15,52 @@
  */
 package org.onosproject.openstackswitching.web;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.onosproject.openstackswitching.OpenstackNetwork;
-import org.onosproject.openstackswitching.OpenstackSwitchingService;
 import org.onosproject.rest.AbstractWebResource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
 import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.InputStream;
 
+/**
+ * Handles REST API call of Neutron ML2 plugin.
+ */
 @Path("networks")
 public class OpenstackNetworkWebResource extends AbstractWebResource {
 
     protected static final Logger log = LoggerFactory
             .getLogger(OpenstackNetworkWebResource.class);
 
-    private static final OpenstackNetworkCodec NETWORK_CODEC = new OpenstackNetworkCodec();
-
     @POST
     @Consumes(MediaType.APPLICATION_JSON)
     @Produces(MediaType.APPLICATION_JSON)
     public Response createNetwork(InputStream input) {
-        try {
-            ObjectMapper mapper = new ObjectMapper();
-            ObjectNode networkNode = (ObjectNode) mapper.readTree(input);
+        log.debug("REST API networks is called {}", input.toString());
+        return Response.status(Response.Status.OK).build();
+    }
 
-            OpenstackNetwork openstackNetwork = NETWORK_CODEC.decode(networkNode, this);
+    @PUT
+    @Path("{id}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response updateNetwork(InputStream input) {
+        log.debug("REST API networks is called {}", input.toString());
+        return Response.status(Response.Status.OK).build();
+    }
 
-            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
-            switchingService.createNetwork(openstackNetwork);
-            return Response.status(Response.Status.OK).build();
-        } catch (Exception e) {
-            log.error("Creates VirtualPort failed because of exception {}",
-                    e.toString());
-            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
-                    .build();
-        }
+    @DELETE
+    @Path("{id}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response deleteNetwork(InputStream input) {
+        log.debug("REST API networks is called {}", input.toString());
+        return Response.status(Response.Status.OK).build();
     }
 }
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortCodec.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortCodec.java
index 94a1edb..63e6d2e 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortCodec.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortCodec.java
@@ -58,6 +58,9 @@
 
         HashMap<String, Ip4Address> fixedIpMap = new HashMap<>();
         JsonNode portInfo = json.get(PORT);
+        if (portInfo == null) {
+            portInfo = json;
+        }
 
         String status = portInfo.path(STATUS).asText();
         String name = portInfo.path(NAME).asText();
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
index e531ba4..faffa73 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
@@ -33,6 +33,9 @@
 import javax.ws.rs.core.Response;
 import java.io.InputStream;
 
+/**
+ * Handles Rest API call from Neutron ML2 plugin.
+ */
 @Path("ports")
 public class OpenstackPortWebResource extends AbstractWebResource {
 
@@ -50,13 +53,15 @@
             ObjectNode portNode = (ObjectNode) mapper.readTree(input);
 
             OpenstackPort openstackPort = PORT_CODEC.decode(portNode, this);
-
-            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
+            OpenstackSwitchingService switchingService =
+                    getService(OpenstackSwitchingService.class);
             switchingService.createPorts(openstackPort);
+
             log.debug("REST API ports is called with {}", portNode.toString());
             return Response.status(Response.Status.OK).build();
+
         } catch (Exception e) {
-            log.error("Creates VirtualPort failed because of exception {}",
+            log.error("Creates Port failed because of exception {}",
                     e.toString());
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
                     .build();
@@ -64,23 +69,12 @@
     }
 
     @DELETE
+    @Path("{id}")
     @Consumes(MediaType.APPLICATION_JSON)
     @Produces(MediaType.APPLICATION_JSON)
     public Response deletesPorts(InputStream input) {
-        try {
-            ObjectMapper mapper = new ObjectMapper();
-            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
-
-            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
-            switchingService.deletePorts();
-            log.info("REST API ports is called with {}", portNode.toString());
-            return Response.status(Response.Status.OK).build();
-        } catch (Exception e) {
-            log.error("Delete VirtualPort failed because of exception {}",
-                    e.toString());
-            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
-                    .build();
-        }
+        log.debug("REST API ports is called with {}", input.toString());
+        return Response.status(Response.Status.OK).build();
     }
 
     @PUT
@@ -88,19 +82,7 @@
     @Consumes(MediaType.APPLICATION_JSON)
     @Produces(MediaType.APPLICATION_JSON)
     public Response updatePorts(InputStream input) {
-        try {
-            ObjectMapper mapper = new ObjectMapper();
-            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
-
-            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
-            switchingService.updatePorts();
-            log.info("REST API ports is called with {}", portNode.toString());
-            return Response.status(Response.Status.OK).build();
-        } catch (Exception e) {
-            log.error("Update VirtualPort failed because of exception {}",
-                    e.toString());
-            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
-                    .build();
-        }
+        log.info("REST API ports is called with {}", input.toString());
+        return Response.status(Response.Status.OK).build();
     }
 }
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetCodec.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetCodec.java
index e504550..2a7af82 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetCodec.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetCodec.java
@@ -51,6 +51,9 @@
     @Override
     public OpenstackSubnet decode(ObjectNode json, CodecContext context) {
         JsonNode subnetInfo = json.get(SUBNET);
+        if (subnetInfo == null) {
+            subnetInfo = json;
+        }
 
         String name = subnetInfo.path(NAME).asText();
         boolean enableDhcp = subnetInfo.path(ENABLE_DHCP).asBoolean();
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetWebResource.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetWebResource.java
index bc0bb8e..43205ea 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetWebResource.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetWebResource.java
@@ -15,18 +15,19 @@
  */
 package org.onosproject.openstackswitching.web;
 
-
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.onosproject.openstackswitching.OpenstackSubnet;
-import org.onosproject.openstackswitching.OpenstackSwitchingService;
+/**
+ * Handles Rest API call from Neutron ML2 plugin.
+ */
 import org.onosproject.rest.AbstractWebResource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
 import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
@@ -37,28 +38,32 @@
     protected static final Logger log = LoggerFactory
             .getLogger(OpenstackSubnetWebResource.class);
 
-    private static final OpenstackSubnetCodec SUBNET_CODEC = new OpenstackSubnetCodec();
-
     @POST
     @Consumes(MediaType.APPLICATION_JSON)
     @Produces(MediaType.APPLICATION_JSON)
     public Response createSubnet(InputStream input) {
-        try {
-            ObjectMapper mapper = new ObjectMapper();
-            ObjectNode subnetNode = (ObjectNode) mapper.readTree(input);
-
-            OpenstackSubnet openstackSubnet = SUBNET_CODEC.decode(subnetNode, this);
-
-            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
-            switchingService.createSubnet(openstackSubnet);
-            log.debug("REST API subnets is called with {}", subnetNode.toString());
-            return Response.status(Response.Status.OK).build();
-        } catch (Exception e) {
-            log.error("Creates VirtualSubnet failed because of exception {}",
-                    e.toString());
-            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
-                    .build();
-        }
+        return Response.status(Response.Status.OK).build();
     }
 
+
+    @PUT
+    @Path("{subnetUUID}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response updateSubnet(@PathParam("id") String id,
+                                 final InputStream input) {
+        return Response.status(Response.Status.OK).build();
+
+    }
+
+    @DELETE
+    @Path("{subnetUUID}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response deleteSubnet(@PathParam("id") String id,
+                                 final InputStream input) {
+        return Response.status(Response.Status.OK).build();
+    }
+
+
 }