diff --git a/apps/openstackswitching/app/app.xml b/apps/openstackswitching/app/app.xml
new file mode 100644
index 0000000..e982b90
--- /dev/null
+++ b/apps/openstackswitching/app/app.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<app name="org.onosproject.openstackswitching" origin="ON.Lab" version="${project.version}"
+     featuresRepo="mvn:${project.groupId}/${project.artifactId}/${project.version}/xml/features"
+     features="${project.artifactId}">
+    <description>${project.description}</description>
+    <artifact>mvn:${project.groupId}/onos-app-openstackswitching/${project.version}</artifact>
+    <artifact>mvn:${project.groupId}/onos-app-dhcp-api/${project.version}</artifact>
+    <artifact>mvn:${project.groupId}/onos-app-dhcp/${project.version}</artifact>
+</app>
diff --git a/apps/openstackswitching/app/features.xml b/apps/openstackswitching/app/features.xml
new file mode 100644
index 0000000..58bdb4a
--- /dev/null
+++ b/apps/openstackswitching/app/features.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!--
+  ~ 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.
+  -->
+<features xmlns="http://karaf.apache.org/xmlns/features/v1.2.0" name="${project.artifactId}-${project.version}">
+    <repository>mvn:${project.groupId}/${project.artifactId}/${project.version}/xml/features</repository>
+    <feature name="onos-app-openstackswitching" version="${project.version}"
+             description="${project.description}">
+        <feature>onos-api</feature>
+        <bundle>mvn:${project.groupId}/onos-app-openstackswitching/${project.version}</bundle>
+        <bundle>mvn:${project.groupId}/onos-app-dhcp-api/${project.version}</bundle>
+        <bundle>mvn:${project.groupId}/onos-app-dhcp/${project.version}</bundle>
+    </feature>
+</features>
diff --git a/apps/openstackswitching/app/pom.xml b/apps/openstackswitching/app/pom.xml
new file mode 100644
index 0000000..27aa127
--- /dev/null
+++ b/apps/openstackswitching/app/pom.xml
@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-openstackswitching</artifactId>
+        <version>1.4.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>onos-app-openstackswitching</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>SONA Openstack Switching  applications</description>
+    <properties>
+        <onos.version>1.4.0-SNAPSHOT</onos.version>
+        <onos.app.name>org.onosproject.openstackswitching</onos.app.name>
+        <web.context>/onos/openstackswitching</web.context>
+        <api.version>1.0.0</api.version>
+        <api.title>ONOS OpenStack Switching REST API</api.title>
+        <api.description>
+            APIs for receiving Neutron information.
+        </api.description>
+        <api.package>org.onosproject.openstackswitching.web</api.package>
+        <onos.app.origin>SKT, Inc.</onos.app.origin>
+    </properties>
+
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-app-openstackswitching-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-rest</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onlab-rest</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.ws.rs</groupId>
+            <artifactId>jsr311-api</artifactId>
+            <version>1.1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.jersey</groupId>
+            <artifactId>jersey-servlet</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.compendium</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-app-dhcp-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <_wab>src/main/webapp/</_wab>
+                        <Bundle-SymbolicName>
+                            ${project.groupId}.${project.artifactId}
+                        </Bundle-SymbolicName>
+                        <Import-Package>
+                            org.slf4j,
+                            org.osgi.framework,
+                            javax.ws.rs,
+                            javax.ws.rs.core,
+                            com.sun.jersey.api.core,
+                            com.sun.jersey.spi.container.servlet,
+                            com.sun.jersey.server.impl.container.servlet,
+                            com.fasterxml.jackson.databind,
+                            com.fasterxml.jackson.databind.node,
+                            com.fasterxml.jackson.core,
+                            org.apache.karaf.shell.commands,
+                            com.google.common.*,
+                            org.onlab.packet.*,
+                            org.onosproject.*
+                        </Import-Package>
+                        <Web-ContextPath>${web.context}</Web-ContextPath>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</project>
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
new file mode 100644
index 0000000..f281e4a
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackArpHandler.java
@@ -0,0 +1,106 @@
+/*
+* 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 org.onlab.packet.ARP;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.packet.DefaultOutboundPacket;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.OutboundPacket;
+import org.onosproject.net.packet.PacketService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import java.nio.ByteBuffer;
+import java.util.Map;
+
+/**
+ * Handles ARP packet from VMs.
+ */
+public class OpenstackArpHandler {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackArpHandler.class);
+    private PacketService packetService;
+    private Map<String, OpenstackPort> openstackPortMap;
+
+    /**
+     * Returns OpenstackArpHandler reference.
+     *
+     * @param openstackPortMap
+     * @param packetService
+     */
+    public OpenstackArpHandler(Map<String, OpenstackPort> openstackPortMap, PacketService packetService) {
+        this.openstackPortMap = openstackPortMap;
+        this.packetService = packetService;
+    }
+
+    /**
+     * Processes ARP packets.
+     *
+     * @param pkt ARP request packet
+     */
+    public void processPacketIn(InboundPacket pkt) {
+        Ethernet ethernet = pkt.parsed();
+        ARP arp = (ARP) ethernet.getPayload();
+
+        if (arp.getOpCode() == ARP.OP_REQUEST) {
+            byte[] srcMacAddress = arp.getSenderHardwareAddress();
+            byte[] srcIPAddress = arp.getSenderProtocolAddress();
+            byte[] dstIPAddress = arp.getTargetProtocolAddress();
+
+            //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);
+
+            if (openstackPort != null) {
+                macAddress = openstackPort.macAddress();
+                log.debug("Found MACAddress: {}", macAddress.toString());
+            } else {
+                return;
+            }
+
+            //Creates a response packet
+            ARP arpReply = new ARP();
+            arpReply.setOpCode(ARP.OP_REPLY)
+                    .setHardwareAddressLength(arp.getHardwareAddressLength())
+                    .setHardwareType(arp.getHardwareType())
+                    .setProtocolAddressLength(arp.getProtocolAddressLength())
+                    .setProtocolType(arp.getProtocolType())
+                    .setSenderHardwareAddress(macAddress.toBytes())
+                    .setSenderProtocolAddress(dstIPAddress)
+                    .setTargetHardwareAddress(srcMacAddress)
+                    .setTargetProtocolAddress(srcIPAddress);
+
+            //Sends a response packet
+            ethernet.setDestinationMACAddress(srcMacAddress)
+                    .setSourceMACAddress(macAddress)
+                    .setEtherType(Ethernet.TYPE_ARP)
+                    .setPayload(arpReply);
+
+            TrafficTreatment.Builder builder = DefaultTrafficTreatment.builder();
+            builder.setOutput(pkt.receivedFrom().port());
+            OutboundPacket packet = new DefaultOutboundPacket(pkt.receivedFrom().deviceId(),
+                    builder.build(), ByteBuffer.wrap(ethernet.serialize()));
+            packetService.emit(packet);
+        }
+    }
+}
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
new file mode 100644
index 0000000..12a9c2c
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingConfig.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2014 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 org.onosproject.core.ApplicationId;
+import org.onosproject.net.config.Config;
+import org.onosproject.net.config.basics.BasicElementConfig;
+
+/**
+ * Handles configuration for OpenstackSwitching app.
+ */
+public class OpenstackSwitchingConfig extends Config<ApplicationId> {
+    public static final String DONOTPUSH = "do_not_push_flows";
+
+    /**
+     * Returns the flag whether the app pushes flows or not.
+     *
+     * @return the flag or false if not set
+     */
+    public boolean doNotPushFlows() {
+        String flag = get(DONOTPUSH, "false");
+        return Boolean.valueOf(flag);
+    }
+
+    /**
+     * Sets the flag whether the app pushes flows or not.
+     *
+     * @param flag the flag whether the app pushes flows or not
+     * @return self
+     */
+    public BasicElementConfig doNotPushFlows(boolean flag) {
+        return (BasicElementConfig) setOrClear(DONOTPUSH, flag);
+    }
+}
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
new file mode 100644
index 0000000..0e7ebac
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingManager.java
@@ -0,0 +1,562 @@
+/*
+ * 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.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;
+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.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;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.config.ConfigFactory;
+import org.onosproject.net.config.NetworkConfigEvent;
+import org.onosproject.net.config.NetworkConfigListener;
+import org.onosproject.net.config.NetworkConfigRegistry;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flowobjective.FlowObjectiveService;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.PacketContext;
+import org.onosproject.net.packet.PacketProcessor;
+import org.onosproject.net.packet.PacketService;
+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;
+import java.util.concurrent.Executors;
+import java.util.stream.Collectors;
+
+import static org.onosproject.net.config.basics.SubjectFactories.APP_SUBJECT_FACTORY;
+
+@SuppressWarnings("ALL")
+@Service
+@Component(immediate = true)
+/**
+ * Populates forwarding rules for VMs created by Openstack.
+ */
+public class OpenstackSwitchingManager implements OpenstackSwitchingService {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackSwitchingManager.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected PacketService packetService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowObjectiveService flowObjectiveService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected NetworkConfigRegistry cfgService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DhcpService dhcpService;
+
+    public static final int DHCP_PORT = 67;
+
+    private ApplicationId appId;
+    private boolean doNotPushFlows;
+    private OpenstackArpHandler arpHandler;
+
+    private OpenstackSwitchingRulePopulator rulePopulator;
+    private ExecutorService deviceEventExcutorService = Executors.newFixedThreadPool(10);
+
+    private InternalPacketProcessor internalPacketProcessor = new InternalPacketProcessor();
+    private InternalDeviceListener internalDeviceListener = new InternalDeviceListener();
+    private InternalConfigListener internalConfigListener = new InternalConfigListener();
+    private final Set<ConfigFactory> factories = ImmutableSet.of(
+            new ConfigFactory<ApplicationId, OpenstackSwitchingConfig>(APP_SUBJECT_FACTORY,
+                    OpenstackSwitchingConfig.class,
+                    "openstackswitching") {
+                @Override
+                public OpenstackSwitchingConfig createConfig() {
+                    return new OpenstackSwitchingConfig();
+                }
+            }
+    );
+    // 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");
+        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);
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        packetService.removeProcessor(internalPacketProcessor);
+        deviceService.removeListener(internalDeviceListener);
+        cfgService.removeListener(internalConfigListener);
+
+        deviceEventExcutorService.shutdown();
+
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createPorts(OpenstackPort openstackPort) {
+        registerDhcpInfo(openstackPort);
+        openstackPortMap.put(openstackPort.id(), openstackPort);
+    }
+
+    @Override
+    public void deletePorts() {
+
+    }
+
+    @Override
+    public void updatePorts() {
+
+    }
+
+    @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()
+                .filter(p -> p.networkId().equals(networkId))
+                .collect(Collectors.toList());
+
+        return portList;
+    }
+
+    @Override
+    public OpenstackPort port(String portName) {
+        String uuid = portName.substring(3);
+        return (OpenstackPort) openstackPortMap.values().stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().get().clone();
+    }
+
+    @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;
+    }
+
+    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);
+            }
+        }
+    }
+
+    private void processPortRemoved(Device device, Port port) {
+        log.debug("port {} is removed", port.toString());
+        // TODO: need to update the vniPortMap
+    }
+
+    private void registerDhcpInfo(OpenstackPort openstackPort) {
+        Ip4Address ip4Address;
+        Ip4Address subnetMask;
+        Ip4Address dhcpServer;
+        Ip4Address gatewayIPAddress;
+        Ip4Address domainServer;
+        OpenstackSubnet openstackSubnet;
+
+        ip4Address = (Ip4Address) openstackPort.fixedIps().values().toArray()[0];
+
+        openstackSubnet = openstackSubnetMap.values().stream()
+                .filter(n -> n.networkId().equals(openstackPort.networkId()))
+                .findFirst().get();
+
+        subnetMask = Ip4Address.valueOf(buildSubnetMask(openstackSubnet.cidr()));
+        gatewayIPAddress = Ip4Address.valueOf(openstackSubnet.gatewayIp());
+        dhcpServer = gatewayIPAddress;
+        // TODO: supports multiple DNS servers
+        if (openstackSubnet.dnsNameservers().isEmpty()) {
+            domainServer = Ip4Address.valueOf("8.8.8.8");
+        } else {
+            domainServer = openstackSubnet.dnsNameservers().get(0);
+        }
+        List<Ip4Address> options = Lists.newArrayList();
+        options.add(subnetMask);
+        options.add(dhcpServer);
+        options.add(gatewayIPAddress);
+        options.add(domainServer);
+
+        dhcpService.setStaticMapping(openstackPort.macAddress(), ip4Address, true, options);
+    }
+
+    private byte[] buildSubnetMask(String cidr) {
+        int prefix;
+        String[] parts = cidr.split("/");
+        prefix = Integer.parseInt(parts[1]);
+        int mask = 0xffffffff << (32 - prefix);
+        byte[] bytes = new byte[]{(byte) (mask >>> 24),
+                (byte) (mask >> 16 & 0xff), (byte) (mask >> 8 & 0xff), (byte) (mask & 0xff)};
+
+        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 {
+
+        @Override
+        public void process(PacketContext context) {
+
+            if (context.isHandled()) {
+                return;
+            }
+
+            InboundPacket pkt = context.inPacket();
+            Ethernet ethernet = pkt.parsed();
+
+            if (ethernet.getEtherType() == Ethernet.TYPE_ARP) {
+                arpHandler.processPacketIn(pkt);
+            }
+        }
+    }
+
+    private class InternalDeviceListener implements DeviceListener {
+
+        @Override
+        public void event(DeviceEvent deviceEvent) {
+            deviceEventExcutorService.execute(new InternalEventHandler(deviceEvent));
+        }
+    }
+
+    private class InternalEventHandler implements Runnable {
+
+        volatile DeviceEvent deviceEvent;
+
+        InternalEventHandler(DeviceEvent deviceEvent) {
+            this.deviceEvent = deviceEvent;
+        }
+
+        @Override
+        public void run() {
+
+            if (doNotPushFlows) {
+                return;
+            }
+
+            switch (deviceEvent.type()) {
+                case DEVICE_ADDED:
+                    processDeviceAdded((Device) deviceEvent.subject());
+                    break;
+                case DEVICE_UPDATED:
+                    Port port = (Port) deviceEvent.subject();
+                    if (port.isEnabled()) {
+                        processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    }
+                    break;
+                case DEVICE_AVAILABILITY_CHANGED:
+                    Device device = (Device) deviceEvent.subject();
+                    if (deviceService.isAvailable(device.id())) {
+                        processDeviceAdded(device);
+                    }
+                    break;
+                case PORT_ADDED:
+                    processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                case PORT_UPDATED:
+                    processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                case PORT_REMOVED:
+                    processPortRemoved((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+
+    private class InternalConfigListener implements NetworkConfigListener {
+
+        @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");
+                }
+            }
+        }
+   }
+
+    private final class PortInfo {
+        DeviceId deviceId;
+        String portName;
+        Ip4Address fixedIp;
+        Ip4Address hostIp;
+
+        private PortInfo(DeviceId deviceId, String portName, Ip4Address fixedIp,
+                         Ip4Address hostIp) {
+            this.deviceId = deviceId;
+            this.portName = portName;
+            this.fixedIp = fixedIp;
+            this.hostIp = hostIp;
+        }
+    }
+
+}
\ No newline at end of file
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
new file mode 100644
index 0000000..fa0b7e6
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingRulePopulator.java
@@ -0,0 +1,226 @@
+/*
+* 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 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.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+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.flowobjective.DefaultForwardingObjective;
+import org.onosproject.net.flowobjective.FlowObjectiveService;
+import org.onosproject.net.flowobjective.ForwardingObjective;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Populates switching flow rules.
+ */
+public class OpenstackSwitchingRulePopulator {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackSwitchingRulePopulator.class);
+
+    private FlowObjectiveService flowObjectiveService;
+    private ApplicationId appId;
+
+    /**
+     * Creates OpenstackSwitchingRulPopulator.
+     *
+     * @param appId application id
+     * @param flowObjectiveService FlowObjectiveService reference
+     */
+    public OpenstackSwitchingRulePopulator(ApplicationId appId,
+                                           FlowObjectiveService flowObjectiveService) {
+        this.flowObjectiveService = flowObjectiveService;
+        this.appId = appId;
+    }
+
+    /**
+     * Populates flows rules for forwarding packets to and from VMs.
+     *
+     * @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.
+     */
+    public boolean populateForwardingRule(Ip4Address ip, DeviceId id, Port port, Ip4Prefix cidr) {
+
+
+        setFlowRuleForVMsInSameCnode(ip, id, port, cidr);
+
+        return true;
+    }
+
+    /**
+     * Populates the common flows rules for all VMs.
+     *
+     * - Send ARP packets to the controller
+     * - Send DHCP packets to the controller
+     *
+     * @param id Device ID to populates rules to
+     */
+    public void populateDefaultRules(DeviceId id) {
+
+        setFlowRuleForArp(id);
+
+        log.warn("Default rule has been set");
+    }
+
+    /**
+     * Populates the forwarding rules for VMs with the same VNI but in other Code.
+     *
+     * @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
+     */
+    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);
+    }
+
+    /**
+     * Populates the flow rules for DHCP packets from VMs.
+     *
+     * @param id device ID to set the rules
+     */
+    private void setFlowRuleForDhcp(DeviceId id) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
+                .matchIPProtocol(IPv4.PROTOCOL_UDP)
+                .matchUdpDst(TpPort.tpPort(OpenstackSwitchingManager.DHCP_PORT));
+        tBuilder.setOutput(PortNumber.CONTROLLER);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Populates the flow rules for ARP packets from VMs.
+     *
+     * @param id device ID to put rules.
+     */
+    private void setFlowRuleForArp(DeviceId id) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_ARP);
+        tBuilder.setOutput(PortNumber.CONTROLLER);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Sets the flow rules for traffic between VMs in the same Cnode.
+     *
+     * @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) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
+                .matchIPDst(ip4Address.toIpPrefix())
+                .matchIPSrc(cidr);
+        tBuilder.setOutput(port.number());
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Sets the flow rules between traffic from VMs in different Cnode.
+     *
+     * @param vni  VNI
+     * @param id device ID
+     * @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) {
+        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);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+}
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/package-info.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/package-info.java
new file mode 100644
index 0000000..cd50f91
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+/**
+ * OpenStack switch interface.
+ */
+package org.onosproject.openstackswitching;
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
new file mode 100644
index 0000000..fc1509d
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkCodec.java
@@ -0,0 +1,66 @@
+/*
+ * 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.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackswitching.OpenstackNetwork;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Implementation of the OpenstackNetwork Codec.
+ *
+ */
+public class OpenstackNetworkCodec extends JsonCodec<OpenstackNetwork> {
+
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkCodec.class);
+
+    private static final String NETWORK = "network";
+    private static final String NAME = "name";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String SEGMENTATION_ID = "provider:segmentation_id";
+    private static final String NETWORK_TYPE = "provider:network_type";
+    private static final String ID = "id";
+
+    @Override
+    public OpenstackNetwork decode(ObjectNode json, CodecContext context) {
+
+        JsonNode networkInfo = json.get(NETWORK);
+
+        String name = networkInfo.path(NAME).asText();
+        String tenantId = networkInfo.path(TENANT_ID).asText();
+        String id = networkInfo.path(ID).asText();
+
+        OpenstackNetwork.Builder onb = OpenstackNetwork.builder();
+        onb.name(name)
+                .tenantId(tenantId)
+                .id(id);
+
+        if (!networkInfo.path(NETWORK_TYPE).isMissingNode()) {
+            onb.networkType(OpenstackNetwork.NetworkType.valueOf(networkInfo.path(NETWORK_TYPE).
+                    asText().toUpperCase()));
+            onb.name(networkInfo.path(NETWORK_TYPE).asText());
+            onb.segmentId(networkInfo.path(SEGMENTATION_ID).asText());
+        }
+
+        return onb.build();
+    }
+
+}
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
new file mode 100644
index 0000000..f4c401f
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackNetworkWebResource.java
@@ -0,0 +1,62 @@
+/*
+ * 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.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.POST;
+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;
+
+@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);
+
+            OpenstackNetwork openstackNetwork = NETWORK_CODEC.decode(networkNode, this);
+
+            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();
+        }
+    }
+}
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
new file mode 100644
index 0000000..94a1edb
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortCodec.java
@@ -0,0 +1,104 @@
+/*
+ * 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.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackswitching.OpenstackPort;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+
+/**
+ * Encodes and decodes the OpenstackPort.
+ */
+public class OpenstackPortCodec extends JsonCodec<OpenstackPort> {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackPortCodec.class);
+
+    // JSON field names
+    private static final String PORT = "port";
+    private static final String STATUS = "status";
+    private static final String NAME = "name";
+    private static final String ADDRESS_PAIR = "allowed_address_pairs";
+    private static final String ADMIN_STATUS = "admin_status";
+    private static final String NETWORK_ID = "network_id";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String DEVICE_OWNER = "device_owner";
+    private static final String MAC_ADDRESS = "mac_address";
+    private static final String FIXED_IPS = "fixed_ips";
+    private static final String SUBNET_ID = "subnet_id";
+    private static final String IP_ADDRESS = "ip_address";
+    private static final String ID = "id";
+    private static final String SECURITY_GROUPS = "security_groups";
+    private static final String DEVICE_ID = "device_id";
+
+    @Override
+    public OpenstackPort decode(ObjectNode json, CodecContext context) {
+
+        HashMap<String, Ip4Address> fixedIpMap = new HashMap<>();
+        JsonNode portInfo = json.get(PORT);
+
+        String status = portInfo.path(STATUS).asText();
+        String name = portInfo.path(NAME).asText();
+        boolean adminStateUp = portInfo.path(ADMIN_STATUS).asBoolean();
+        String networkId = portInfo.path(NETWORK_ID).asText();
+        String tenantId = portInfo.path(TENANT_ID).asText();
+        String deviceOwner = portInfo.path(DEVICE_OWNER).asText();
+        String macStr = portInfo.path(MAC_ADDRESS).asText();
+        ArrayNode fixedIpList = (ArrayNode) portInfo.path(FIXED_IPS);
+        for (JsonNode fixedIpInfo: fixedIpList) {
+            String subnetId = fixedIpInfo.path(SUBNET_ID).asText();
+            String ipAddressStr = fixedIpInfo.path(IP_ADDRESS).asText();
+            if (ipAddressStr != null) {
+                Ip4Address ipAddress = Ip4Address.valueOf(ipAddressStr);
+                fixedIpMap.put(subnetId, ipAddress);
+            }
+        }
+        String id = portInfo.path(ID).asText();
+        String securityGroups = portInfo.path(SECURITY_GROUPS).asText();
+        String deviceId = portInfo.path(DEVICE_ID).asText();
+
+        OpenstackPort.Builder openstackPortBuilder = OpenstackPort.builder();
+        openstackPortBuilder.portStatus(OpenstackPort.PortStatus.valueOf(status))
+                .name(name)
+                .adminState(adminStateUp)
+                .netwrokId(networkId)
+                .tenantId(tenantId)
+                .deviceOwner(deviceOwner)
+                .macAddress(MacAddress.valueOf(macStr))
+                .fixedIps(fixedIpMap)
+                .id(id)
+                .deviceId(deviceId);
+
+        // FIX ME
+        if (!securityGroups.isEmpty()) {
+            openstackPortBuilder.securityGroup(securityGroups);
+        }
+
+        OpenstackPort openstackPort = openstackPortBuilder.build();
+
+        return openstackPort;
+    }
+
+}
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
new file mode 100644
index 0000000..e531ba4
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
@@ -0,0 +1,106 @@
+/*
+ * 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.web;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.openstackswitching.OpenstackPort;
+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;
+
+@Path("ports")
+public class OpenstackPortWebResource extends AbstractWebResource {
+
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackPortWebResource.class);
+
+    private static final OpenstackPortCodec PORT_CODEC = new OpenstackPortCodec();
+
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createPorts(InputStream input) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackPort openstackPort = PORT_CODEC.decode(portNode, this);
+
+            OpenstackSwitchingService switchingService = get(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 {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @DELETE
+    @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();
+        }
+    }
+
+    @PUT
+    @Path("{id}")
+    @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();
+        }
+    }
+}
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
new file mode 100644
index 0000000..e504550
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetCodec.java
@@ -0,0 +1,80 @@
+/*
+ * 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.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Lists;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackswitching.OpenstackSubnet;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+
+/**
+ * Encodes and decodes the OpenstackSubnet.
+ */
+public class OpenstackSubnetCodec extends JsonCodec<OpenstackSubnet> {
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackSubnetCodec.class);
+
+    // JSON Field names
+    private static final String SUBNET = "subnet";
+    private static final String NAME = "name";
+    private static final String ENABLE_DHCP = "enable_dhcp";
+    private static final String NETWORK_ID = "network_id";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String DNS_NAMESERVERS = "dns_nameservers";
+    private static final String GATEWAY_IP = "gateway_ip";
+    private static final String CIDR = "cidr";
+    private static final String ID = "id";
+
+    @Override
+    public OpenstackSubnet decode(ObjectNode json, CodecContext context) {
+        JsonNode subnetInfo = json.get(SUBNET);
+
+        String name = subnetInfo.path(NAME).asText();
+        boolean enableDhcp = subnetInfo.path(ENABLE_DHCP).asBoolean();
+        String networkId = subnetInfo.path(NETWORK_ID).asText();
+        String tenantId = subnetInfo.path(TENANT_ID).asText();
+        ArrayNode dnsNameservsers = (ArrayNode) subnetInfo.path(DNS_NAMESERVERS);
+        List<Ip4Address> dnsList = Lists.newArrayList();
+        if (dnsNameservsers != null && !dnsNameservsers.isMissingNode()) {
+            dnsNameservsers.forEach(dns -> dnsList.add(Ip4Address.valueOf(dns.asText())));
+        }
+        String gatewayIp = subnetInfo.path(GATEWAY_IP).asText();
+        String cidr = subnetInfo.path(CIDR).asText();
+        String id = subnetInfo.path(ID).asText();
+
+        OpenstackSubnet openstackSubnet = OpenstackSubnet.builder()
+                .setName(name)
+                .setEnableDhcp(enableDhcp)
+                .setNetworkId(networkId)
+                .setTenantId(tenantId)
+                .setDnsNameservers(dnsList)
+                .setGatewayIp(gatewayIp)
+                .setCidr(cidr)
+                .setId(id)
+                .build();
+        return openstackSubnet;
+    }
+}
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
new file mode 100644
index 0000000..bc0bb8e
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackSubnetWebResource.java
@@ -0,0 +1,64 @@
+/*
+ * 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.web;
+
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.openstackswitching.OpenstackSubnet;
+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.POST;
+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;
+
+@Path("subnets")
+public class OpenstackSubnetWebResource extends AbstractWebResource {
+    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();
+        }
+    }
+
+}
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/package-info.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/package-info.java
new file mode 100644
index 0000000..91e19c6
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+/**
+ * OpenStack switching REST API.
+ */
+package org.onosproject.openstackswitching.web;
diff --git a/apps/openstackswitching/app/src/main/webapp/WEB-INF/web.xml b/apps/openstackswitching/app/src/main/webapp/WEB-INF/web.xml
new file mode 100644
index 0000000..4f50ef7
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/webapp/WEB-INF/web.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
+         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         id="ONOS" version="2.5">
+    <display-name>Openstack Switching REST API v1.0</display-name>
+
+    <servlet>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
+        <init-param>
+            <param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
+            <param-value>com.sun.jersey.api.core.ClassNamesResourceConfig</param-value>
+        </init-param>
+        <init-param>
+            <param-name>com.sun.jersey.config.property.classnames</param-name>
+            <param-value>
+                org.onosproject.openstackswitching.web.OpenstackPortWebResource,
+                org.onosproject.openstackswitching.web.OpenstackNetworkWebResource,
+                org.onosproject.openstackswitching.web.OpenstackSubnetWebResource
+            </param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <url-pattern>/*</url-pattern>
+    </servlet-mapping>
+</web-app>