diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackNetwork.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackNetwork.java
new file mode 100644
index 0000000..1b28d0c
--- /dev/null
+++ b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackNetwork.java
@@ -0,0 +1,127 @@
+/*
+ * 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 static com.google.common.base.Preconditions.checkNotNull;
+
+
+/**
+ * Represents the network information given by Neutron.
+ */
+public final class OpenstackNetwork {
+
+    private String name;
+    private String tenantId;
+    private String segmentId;
+    private String id;
+    private NetworkType networkType;
+
+    public enum NetworkType {
+        /**
+         * Currently only VXLAN moded is supported.
+         */
+        VXLAN,
+        VLAN,
+        STT,
+        LOCAL
+    }
+
+    /**
+     * Returns the builder object of the OpenstackNetwork class.
+     *
+     * @return OpenstackNetwork builder object
+     */
+    public static OpenstackNetwork.Builder builder() {
+        return new Builder();
+    }
+
+    private OpenstackNetwork(String name, String tenantId, String id, String sid,
+                             NetworkType type) {
+        this.name = checkNotNull(name);
+        this.tenantId = checkNotNull(tenantId);
+        this.segmentId = checkNotNull(sid);
+        this.id = checkNotNull(id);
+        this.networkType = type;
+    }
+
+    public String name() {
+        return this.name;
+    }
+
+    public String tenantId() {
+        return this.tenantId;
+    }
+
+    public String id() {
+        return this.id;
+    }
+
+    public String segmentId() {
+        return this.segmentId;
+    }
+
+    public NetworkType networkType() {
+        return this.networkType;
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+       return super.clone();
+    }
+
+    public static final class Builder {
+        private String name;
+        private String tenantId;
+        private String id;
+        private String sid;
+        private NetworkType networkType;
+
+        public Builder name(String name) {
+            this.name = name;
+
+            return this;
+        }
+
+        public Builder tenantId(String tenantId) {
+            this.tenantId = tenantId;
+
+            return this;
+        }
+
+        public Builder id(String id) {
+            this.id = id;
+
+            return this;
+        }
+
+        public Builder segmentId(String sid) {
+            this.sid = sid;
+
+            return this;
+        }
+
+        public Builder networkType(NetworkType type) {
+            this.networkType = type;
+
+            return this;
+        }
+
+        public OpenstackNetwork build() {
+            return new OpenstackNetwork(name, tenantId, id, sid, networkType);
+        }
+
+    }
+}
diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPort.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPort.java
new file mode 100644
index 0000000..50afdf3
--- /dev/null
+++ b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPort.java
@@ -0,0 +1,361 @@
+/*
+ * 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.Lists;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * It represents the Openstack Port information.
+ */
+public final class OpenstackPort {
+
+    public enum PortStatus {
+        UP,
+        DOWN
+    }
+
+    private PortStatus status;
+    private String name;
+    // FIX_ME
+    private String allowedAddressPairs;
+    private boolean adminStateUp;
+    private String networkId;
+    private String tenantId;
+    private String deviceOwner;
+    private MacAddress macAddress;
+    // <subnet id, ip address>
+    private HashMap<String, Ip4Address> fixedIps;
+    private String id;
+    private List<String> securityGroups;
+    private String deviceId;
+
+    private OpenstackPort(PortStatus status, String name, boolean adminStateUp,
+                          String networkId, String tenantId, String deviceOwner,
+                          MacAddress macAddress, HashMap fixedIps, String id,
+                          List<String> securityGroups, String deviceId) {
+
+        this.status = status;
+        this.name = name;
+        this.adminStateUp = adminStateUp;
+        this.networkId = checkNotNull(networkId);
+        this.tenantId = checkNotNull(tenantId);
+        this.deviceOwner = deviceOwner;
+        this.macAddress = checkNotNull(macAddress);
+        this.fixedIps = checkNotNull(fixedIps);
+        this.id = checkNotNull(id);
+        this.securityGroups = securityGroups;
+        this.deviceId = deviceId;
+    }
+
+
+
+    /**
+     * Returns OpenstackPort builder object.
+     *
+     * @return OpenstackPort builder
+     */
+    public static OpenstackPort.Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Returns port status.
+     *
+     * @return port status
+     */
+    public PortStatus status() {
+        return status;
+    }
+
+    /**
+     * Returns port name.
+     *
+     * @return port name
+     */
+    public String name() {
+        return name;
+    }
+
+    /**
+     * Returns whether admin state up or not.
+     *
+     * @return true if admin state up, false otherwise
+     */
+    public boolean isAdminStateUp() {
+        return adminStateUp;
+    }
+
+    /**
+     * Returns network ID.
+     *
+     * @return network ID
+     */
+    public String networkId() {
+        return networkId;
+    }
+
+    /**
+     * Returns device owner.
+     *
+     * @return device owner
+     */
+    public String deviceOwner() {
+        return deviceOwner;
+    }
+
+    /**
+     * Returns mac address.
+     *
+     * @return mac address
+     */
+    public MacAddress macAddress() {
+        return macAddress;
+    }
+
+    /**
+     * Returns the fixed IP information.
+     *
+     * @return fixed IP info
+     */
+    public HashMap fixedIps() {
+        return fixedIps;
+    }
+
+    /**
+     * Returns port ID.
+     *
+     * @return port ID
+     */
+    public String id() {
+        return id;
+    }
+
+    /**
+     * Returns security group information.
+     *
+     * @return security group info
+     */
+    public List<String> securityGroups() {
+        return securityGroups;
+    }
+
+    /**
+     * Returns device ID.
+     *
+     * @return device ID
+     */
+    public String deviceId() {
+        return deviceId;
+    }
+
+    // TODO : Implement the following functions when necessary
+    //@Override
+    //public void equals(Object that) {
+    //
+    //}
+    //
+    //@Override
+    //public int hashCode() {
+    //
+    //}
+
+    @Override
+    public Object clone() {
+        OpenstackPort op = new OpenstackPort(this.status, this.name, this.adminStateUp,
+                this.networkId, this.tenantId, this.deviceOwner, this.macAddress,
+                (HashMap) this.fixedIps.clone(), this.id,
+                Collections.unmodifiableList(this.securityGroups), this.deviceId);
+
+        return op;
+    }
+
+    /**
+     * OpenstackPort Builder class.
+     */
+    public static final class Builder {
+
+        private PortStatus status;
+        private String name;
+        // FIX_ME
+        private String allowedAddressPairs;
+        private boolean adminStateUp;
+        private String networkId;
+        private String tenantId;
+        private String deviceOwner;
+        private MacAddress macAddress;
+        // list  of hash map <subnet id, ip address>
+        private HashMap<String, Ip4Address> fixedIps;
+        private String id;
+        private List<String> securityGroups;
+        private String deviceId;
+
+        Builder() {
+            fixedIps = new HashMap<>();
+            securityGroups = Lists.newArrayList();
+        }
+
+        /**
+         * Sets port status.
+         *
+         * @param status port status
+         * @return Builder object
+         */
+        public Builder portStatus(PortStatus status) {
+            this.status = status;
+
+            return this;
+        }
+
+        /**
+         * Sets port name.
+         *
+         * @param name port name
+         * @return Builder object
+         */
+        public Builder name(String name) {
+            this.name = name;
+
+            return this;
+        }
+
+        /**
+         * Sets whether admin state up or not.
+         *
+         * @param isAdminStateUp true if admin state is up, false otherwise
+         * @return Builder object
+         */
+        public Builder adminState(boolean isAdminStateUp) {
+            this.adminStateUp = isAdminStateUp;
+
+            return this;
+        }
+
+        /**
+         * Sets network ID.
+         *
+         * @param networkId network ID
+         * @return Builder object
+         */
+        public Builder netwrokId(String networkId) {
+            this.networkId = networkId;
+
+            return this;
+        }
+
+        /**
+         * Sets tenant ID.
+         *
+         * @param tenantId tenant ID
+         * @return Builder object
+         */
+        public Builder tenantId(String tenantId) {
+            this.tenantId = tenantId;
+
+            return this;
+        }
+
+        /**
+         * Sets device owner.
+         *
+         * @param owner device owner
+         * @return Builder object
+         */
+        public Builder deviceOwner(String owner) {
+            this.deviceOwner = owner;
+
+            return this;
+        }
+
+        /**
+         * Sets MAC address of the port.
+         *
+         * @param mac MAC address
+         * @return Builder object
+         */
+        public Builder macAddress(MacAddress mac) {
+            this.macAddress = mac;
+
+            return this;
+        }
+
+        /**
+         * Sets Fixed IP address information.
+         *
+         * @param fixedIpList Fixed IP info
+         * @return Builder object
+         */
+        public Builder fixedIps(HashMap<String, Ip4Address> fixedIpList) {
+            fixedIps.putAll(fixedIpList);
+
+            return this;
+        }
+
+        /**
+         * Sets ID of the port.
+         *
+         * @param id ID of the port
+         * @return Builder object
+         */
+        public Builder id(String id) {
+            this.id = id;
+
+            return this;
+        }
+
+        /**
+         * Sets security group of the port.
+         *
+         * @param securityGroup security group of the port
+         * @return Builder object
+         */
+        public Builder securityGroup(String securityGroup) {
+            securityGroups.add(securityGroup);
+
+            return this;
+        }
+
+        /**
+         * Sets device ID of the port.
+         *
+         * @param deviceId device ID
+         * @return Builder object
+         */
+        public Builder deviceId(String deviceId) {
+            this.deviceId = deviceId;
+
+            return this;
+        }
+
+        /**
+         * Builds an OpenstackPort object.
+         *
+         * @return OpenstackPort objecet
+         */
+        public OpenstackPort build() {
+            return new OpenstackPort(status, name, adminStateUp, networkId, networkId,
+                    deviceOwner, macAddress, fixedIps, id, securityGroups, deviceId);
+        }
+    }
+}
+
diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSubnet.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSubnet.java
new file mode 100644
index 0000000..bc536e8
--- /dev/null
+++ b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSubnet.java
@@ -0,0 +1,161 @@
+/*
+ * 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.Ip4Address;
+
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Represents the subnet information given by Neutron.
+ *
+ */
+public final class OpenstackSubnet {
+    private String name;
+    private boolean enableHhcp;
+    private String networkId;
+    private String tenantId;
+    private List<Ip4Address> dnsNameservers;
+    private String gatewayIp;
+    private String cidr;
+    private String id;
+
+    private OpenstackSubnet(String name, boolean enableHhcp, String networkId,
+                            String tenantId, List<Ip4Address> dnsNameservers, String gatewayIp,
+                            String cidr, String id) {
+        this.name = name;
+        this.enableHhcp = enableHhcp;
+        this.networkId = checkNotNull(networkId);
+        this.tenantId = checkNotNull(tenantId);
+        this.dnsNameservers = dnsNameservers;
+        this.gatewayIp = gatewayIp;
+        this.cidr = checkNotNull(cidr);
+        this.id = checkNotNull(id);
+    }
+
+    /**
+     * Returns OpenstackSubnet builder object.
+     *
+     * @return OpenstackSubnet builder
+     */
+    public static OpenstackSubnet.Builder builder() {
+        return new Builder();
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public boolean enableHhcp() {
+        return enableHhcp;
+    }
+
+    public String networkId() {
+        return networkId;
+    }
+
+    public String tenantId() {
+        return tenantId;
+    }
+
+    public List<Ip4Address> dnsNameservers() {
+        return dnsNameservers;
+    }
+
+    public String gatewayIp() {
+        return gatewayIp;
+    }
+
+    public String cidr() {
+        return cidr;
+    }
+
+    public String id() {
+        return id;
+    }
+
+    /**
+     * OpenstackSubnet Builder class.
+     *
+     */
+    public static final class Builder {
+        private String name;
+        private boolean enableDhcp;
+        private String networkId;
+        private String tenantId;
+        private List<Ip4Address> dnsNameservers;
+        private String gatewayIp;
+        private String cidr;
+        private String id;
+
+        Builder() {}
+
+        public Builder setName(String name) {
+            this.name = name;
+
+            return this;
+        }
+
+        public Builder setEnableDhcp(boolean enableDhcp) {
+            this.enableDhcp = enableDhcp;
+
+            return this;
+        }
+
+        public Builder setNetworkId(String networkId) {
+            this.networkId = networkId;
+
+            return this;
+        }
+
+        public Builder setTenantId(String tenantId) {
+            this.tenantId = tenantId;
+
+            return this;
+        }
+
+        public Builder setDnsNameservers(List<Ip4Address> dnsNameservers) {
+            this.dnsNameservers = dnsNameservers;
+
+            return this;
+        }
+
+        public Builder setGatewayIp(String gatewayIp) {
+            this.gatewayIp = gatewayIp;
+
+            return this;
+        }
+
+        public Builder setCidr(String cidr) {
+            this.cidr = cidr;
+
+            return this;
+        }
+
+        public Builder setId(String id) {
+            this.id = id;
+
+            return this;
+        }
+
+        public OpenstackSubnet build() {
+            return new OpenstackSubnet(name, enableDhcp, networkId, tenantId,
+                    dnsNameservers, gatewayIp, cidr, id);
+        }
+    }
+}
diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingService.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingService.java
new file mode 100644
index 0000000..16898d7
--- /dev/null
+++ b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackSwitchingService.java
@@ -0,0 +1,82 @@
+/*
+ * 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 java.util.Collection;
+
+/**
+ * Handles port management REST API from Openstack for VMs.
+ */
+public interface OpenstackSwitchingService {
+
+    /**
+     * Store the port information created by Openstack.
+     *
+     * @param openstackPort port information
+     */
+    void createPorts(OpenstackPort openstackPort);
+
+    /**
+     * Removes flow rules corresponding to the port removed by Openstack.
+     *
+     */
+    void deletePorts();
+
+    /**
+     * Updates flow rules corresponding to the port information updated by Openstack.
+     *
+     */
+    void updatePorts();
+
+    /**
+     * Stores the network information created by openstack.
+     *
+     * @param openstackNetwork network information
+     */
+    void createNetwork(OpenstackNetwork openstackNetwork);
+
+    /**
+     * Stores the subnet information created by openstack.
+     *
+     * @param openstackSubnet subnet information
+     */
+    void createSubnet(OpenstackSubnet openstackSubnet);
+
+    /**
+     * Returns port information list for the network ID given.
+     *
+     * @param networkId Network ID of the ports
+     * @return port information list
+     */
+    Collection<OpenstackPort> ports(String networkId);
+
+    /**
+     * Returns port information for the port ID given.
+     *
+     * @param portId Port ID
+     * @return port information
+     */
+    OpenstackPort port(String portId);
+
+    /**
+     * Returns network information list for the network ID given.
+     *
+     * @param networkId Network ID
+     * @return network information list
+     */
+    OpenstackNetwork network(String networkId);
+
+}
diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/package-info.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/package-info.java
new file mode 100644
index 0000000..cd50f91
--- /dev/null
+++ b/apps/openstackswitching/api/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;