diff --git a/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/OvsdbControllerImpl.java b/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/OvsdbControllerImpl.java
new file mode 100644
index 0000000..5ffd003
--- /dev/null
+++ b/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/OvsdbControllerImpl.java
@@ -0,0 +1,429 @@
+/*
+ * 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.ovsdb.controller.impl;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.math.BigInteger;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArraySet;
+import java.util.concurrent.ExecutionException;
+
+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.Service;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onosproject.ovsdb.controller.DefaultEventSubject;
+import org.onosproject.ovsdb.controller.EventSubject;
+import org.onosproject.ovsdb.controller.OvsdbClientService;
+import org.onosproject.ovsdb.controller.OvsdbConstant;
+import org.onosproject.ovsdb.controller.OvsdbController;
+import org.onosproject.ovsdb.controller.OvsdbDatapathId;
+import org.onosproject.ovsdb.controller.OvsdbEvent;
+import org.onosproject.ovsdb.controller.OvsdbEvent.Type;
+import org.onosproject.ovsdb.controller.OvsdbEventListener;
+import org.onosproject.ovsdb.controller.OvsdbIfaceId;
+import org.onosproject.ovsdb.controller.OvsdbNodeId;
+import org.onosproject.ovsdb.controller.OvsdbNodeListener;
+import org.onosproject.ovsdb.controller.OvsdbPortName;
+import org.onosproject.ovsdb.controller.OvsdbPortNumber;
+import org.onosproject.ovsdb.controller.OvsdbPortType;
+import org.onosproject.ovsdb.controller.driver.OvsdbAgent;
+import org.onosproject.ovsdb.rfc.jsonrpc.Callback;
+import org.onosproject.ovsdb.rfc.message.TableUpdate;
+import org.onosproject.ovsdb.rfc.message.TableUpdates;
+import org.onosproject.ovsdb.rfc.message.UpdateNotification;
+import org.onosproject.ovsdb.rfc.notation.OvsdbMap;
+import org.onosproject.ovsdb.rfc.notation.OvsdbSet;
+import org.onosproject.ovsdb.rfc.notation.Row;
+import org.onosproject.ovsdb.rfc.notation.UUID;
+import org.onosproject.ovsdb.rfc.schema.DatabaseSchema;
+import org.onosproject.ovsdb.rfc.table.Bridge;
+import org.onosproject.ovsdb.rfc.table.Interface;
+import org.onosproject.ovsdb.rfc.table.OvsdbTable;
+import org.onosproject.ovsdb.rfc.table.Port;
+import org.onosproject.ovsdb.rfc.table.TableGenerator;
+import org.onosproject.ovsdb.rfc.utils.FromJsonUtil;
+import org.osgi.service.component.ComponentContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * The implementation of OvsdbController.
+ */
+@Component(immediate = true)
+@Service
+public class OvsdbControllerImpl implements OvsdbController {
+
+    public static final Logger log = LoggerFactory
+            .getLogger(OvsdbControllerImpl.class);
+
+    protected ConcurrentHashMap<OvsdbNodeId, OvsdbClientService> ovsdbClients =
+            new ConcurrentHashMap<OvsdbNodeId, OvsdbClientService>();
+
+    protected OvsdbAgent agent = new InternalOvsdbNodeAgent();
+    protected InternalMonitorCallBack updateCallback = new InternalMonitorCallBack();
+
+    protected Set<OvsdbNodeListener> ovsdbNodeListener = new CopyOnWriteArraySet<>();
+    protected Set<OvsdbEventListener> ovsdbEventListener = new CopyOnWriteArraySet<>();
+
+    protected ConcurrentHashMap<String, OvsdbClientService> requestNotification =
+            new ConcurrentHashMap<String, OvsdbClientService>();
+
+    protected ConcurrentHashMap<String, String> requestDbName = new ConcurrentHashMap<String, String>();
+
+    private final Controller controller = new Controller();
+
+    @Activate
+    public void activate(ComponentContext context) {
+        controller.start(agent, updateCallback);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        controller.stop();
+        log.info("Stoped");
+    }
+
+    @Override
+    public void addNodeListener(OvsdbNodeListener listener) {
+        if (!ovsdbNodeListener.contains(listener)) {
+            this.ovsdbNodeListener.add(listener);
+        }
+    }
+
+    @Override
+    public void removeNodeListener(OvsdbNodeListener listener) {
+        this.ovsdbNodeListener.remove(listener);
+    }
+
+    @Override
+    public void addOvsdbEventListener(OvsdbEventListener listener) {
+        if (!ovsdbEventListener.contains(listener)) {
+            this.ovsdbEventListener.add(listener);
+        }
+    }
+
+    @Override
+    public void removeOvsdbEventListener(OvsdbEventListener listener) {
+        this.ovsdbEventListener.remove(listener);
+    }
+
+    @Override
+    public List<OvsdbNodeId> getNodeIds() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public OvsdbClientService getOvsdbClient(OvsdbNodeId nodeId) {
+        return ovsdbClients.get(nodeId);
+    }
+
+    /**
+     * Implementation of an Ovsdb Agent which is responsible for keeping track
+     * of connected node and the state in which they are.
+     */
+    private class InternalOvsdbNodeAgent implements OvsdbAgent {
+        @Override
+        public void addConnectedNode(OvsdbNodeId nodeId,
+                                     OvsdbClientService ovsdbClient) {
+
+            if (ovsdbClients.get(nodeId) != null) {
+                return;
+            } else {
+                ovsdbClients.put(nodeId, ovsdbClient);
+
+                try {
+                    List<String> dbNames = ovsdbClient.listDbs().get();
+                    for (String dbName : dbNames) {
+                        DatabaseSchema dbSchema;
+                        dbSchema = ovsdbClient.getOvsdbSchema(dbName).get();
+
+                        log.debug("Begin to monitor tables");
+                        String id = java.util.UUID.randomUUID().toString();
+                        TableUpdates updates = ovsdbClient
+                                .monitorTables(dbName, id).get();
+
+                        requestDbName.put(id, dbName);
+                        requestNotification.put(id, ovsdbClient);
+
+                        if (updates != null) {
+                            processTableUpdates(ovsdbClient, updates,
+                                                dbSchema.name());
+                        }
+                    }
+                } catch (InterruptedException e) {
+                    log.warn("Interrupted while waiting to get message from ovsdb");
+                    Thread.currentThread().interrupt();
+                } catch (ExecutionException e) {
+                    log.error("Exception thrown while to get message from ovsdb");
+                }
+
+                log.debug("Add node to north");
+                for (OvsdbNodeListener l : ovsdbNodeListener) {
+                    l.nodeAdded(nodeId);
+                }
+                return;
+            }
+        }
+
+        @Override
+        public void removeConnectedNode(OvsdbNodeId nodeId) {
+            ovsdbClients.remove(nodeId);
+            log.debug("Node connection is removed");
+            for (OvsdbNodeListener l : ovsdbNodeListener) {
+                l.nodeRemoved(nodeId);
+            }
+        }
+    }
+
+    /**
+     * Processes table updates.
+     *
+     * @param clientService OvsdbClientService instance
+     * @param updates TableUpdates instance
+     * @param dbName ovsdb database name
+     */
+    private void processTableUpdates(OvsdbClientService clientService,
+                                     TableUpdates updates, String dbName)
+            throws InterruptedException {
+        checkNotNull(clientService, "OvsdbClientService is not null");
+
+        DatabaseSchema dbSchema = clientService.getDatabaseSchema(dbName);
+
+        for (String tableName : updates.result().keySet()) {
+            TableUpdate update = updates.result().get(tableName);
+            for (UUID uuid : (Set<UUID>) update.rows().keySet()) {
+                log.debug("Begin to process table updates uuid: {}, databaseName: {}, tableName: {}",
+                         uuid.value(), dbName, tableName);
+
+                Row row = clientService.getRow(dbName, tableName, uuid.value());
+                clientService.updateOvsdbStore(dbName, tableName, uuid.value(),
+                                               update.getNew(uuid));
+                if (update.getNew(uuid) != null) {
+                    boolean isNewRow = (row == null) ? true : false;
+                    if (isNewRow) {
+                        if (OvsdbConstant.PORT.equals(tableName)) {
+                            dispatchEvent(clientService, update.getNew(uuid),
+                                          null, OvsdbEvent.Type.PORT_ADDED,
+                                          dbSchema);
+                        }
+                    }
+                } else if (update.getOld(uuid) != null) {
+                    clientService.removeRow(dbName, tableName, uuid.toString());
+                    if (update.getOld(uuid) != null) {
+                        if (OvsdbConstant.PORT.equals(tableName)) {
+                            dispatchEvent(clientService, null,
+                                          update.getOld(uuid),
+                                          OvsdbEvent.Type.PORT_REMOVED,
+                                          dbSchema);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Dispatches event to the north.
+     *
+     * @param clientService OvsdbClientService instance
+     * @param newRow a new row
+     * @param oldRow an old row
+     * @param eventType type of event
+     * @param dbSchema ovsdb database schema
+     */
+    private void dispatchEvent(OvsdbClientService clientService, Row newRow,
+                               Row oldRow, Type eventType,
+                               DatabaseSchema dbSchema) {
+        Port port = null;
+        if (OvsdbEvent.Type.PORT_ADDED.equals(eventType)) {
+            port = (Port) TableGenerator.getTable(dbSchema, newRow,
+                                                  OvsdbTable.PORT);
+        } else if (OvsdbEvent.Type.PORT_REMOVED.equals(eventType)) {
+            port = (Port) TableGenerator.getTable(dbSchema, oldRow,
+                                                  OvsdbTable.PORT);
+        }
+        if (port == null) {
+            return;
+        }
+
+        long dpid = getDataPathid(clientService, dbSchema);
+        OvsdbSet intfUuidSet = (OvsdbSet) port.getInterfacesColumn().data();
+        @SuppressWarnings({ "unchecked" })
+        Set<UUID> intfUuids = intfUuidSet.set();
+        for (UUID intfUuid : intfUuids) {
+            Row intfRow = clientService
+                    .getRow(OvsdbConstant.DATABASENAME, "Interface",
+                            intfUuid.toString());
+            if (intfRow == null) {
+                continue;
+            }
+            Interface intf = (Interface) TableGenerator
+                    .getTable(dbSchema, intfRow, OvsdbTable.INTERFACE);
+
+            String portType = (String) intf.getTypeColumn().data();
+            long localPort = getOfPort(intf);
+            String[] macAndIfaceId = getMacAndIfaceid(intf);
+            if (macAndIfaceId == null) {
+                return;
+            }
+            EventSubject eventSubject = new DefaultEventSubject(
+                                                                MacAddress
+                                                                        .valueOf(macAndIfaceId[0]),
+                                                                new HashSet<IpAddress>(),
+                                                                new OvsdbPortName(port.getName()),
+                                                                new OvsdbPortNumber(localPort),
+                                                                new OvsdbDatapathId(Long.toString(dpid)),
+                                                                new OvsdbPortType(portType),
+                                                                new OvsdbIfaceId(macAndIfaceId[1]));
+            for (OvsdbEventListener listener : ovsdbEventListener) {
+                listener.handle(new OvsdbEvent<EventSubject>(eventType,
+                                                             eventSubject));
+            }
+
+        }
+
+    }
+
+    /**
+     * Gets mac and iface from the table Interface.
+     *
+     * @param intf Interface instance
+     * @return attachedMac, ifaceid
+     */
+    private String[] getMacAndIfaceid(Interface intf) {
+        OvsdbMap ovsdbMap = (OvsdbMap) intf.getExternalIdsColumn().data();
+        @SuppressWarnings("unchecked")
+        Map<String, String> externalIds = ovsdbMap.map();
+        if (externalIds == null) {
+            log.warn("The external_ids is null");
+            return null;
+        }
+
+        String attachedMac = externalIds.get(OvsdbConstant.EXTERNAL_ID_VM_MAC);
+        if (attachedMac == null) {
+            log.warn("The attachedMac is null");
+            return null;
+        }
+        String ifaceid = externalIds
+                .get(OvsdbConstant.EXTERNAL_ID_INTERFACE_ID);
+        if (ifaceid == null) {
+            log.warn("The ifaceid is null");
+            return null;
+        }
+        return new String[] {attachedMac, ifaceid};
+    }
+
+    /**
+     * Gets ofPorts number from table Interface.
+     *
+     * @param intf Interface instance
+     * @return ofport the ofport number
+     */
+    private long getOfPort(Interface intf) {
+        OvsdbSet ovsdbSet = (OvsdbSet) intf.getOpenFlowPortColumn().data();
+        @SuppressWarnings("unchecked")
+        Set<Long> ofPorts = ovsdbSet.set();
+        while (ofPorts == null || ofPorts.size() <= 0) {
+            log.debug("The ofport is null in {}", intf.getName());
+            return 0;
+        }
+        return (long) ofPorts.toArray()[0];
+    }
+
+    /**
+     * Gets datapathid from table bridge.
+     *
+     * @param clientService OvsdbClientService instance
+     * @param dbSchema ovsdb database schema
+     * @return datapathid the bridge datapathid
+     */
+    private long getDataPathid(OvsdbClientService clientService,
+                               DatabaseSchema dbSchema) {
+        String bridgeUuid = clientService
+                .getBridgeUuid(OvsdbConstant.INTEGRATION_BRIDGE);
+        if (bridgeUuid == null) {
+            log.debug("Unable to spot bridge uuid for {} in {}",
+                     OvsdbConstant.INTEGRATION_BRIDGE, clientService);
+            return 0;
+        }
+
+        Row bridgeRow = clientService.getRow(OvsdbConstant.DATABASENAME,
+                                             "Bridge", bridgeUuid);
+        Bridge bridge = (Bridge) TableGenerator.getTable(dbSchema, bridgeRow,
+                                                         OvsdbTable.BRIDGE);
+        OvsdbSet ovsdbSet = (OvsdbSet) bridge.getDatapathIdColumn().data();
+        @SuppressWarnings("unchecked")
+        Set<String> dpids = ovsdbSet.set();
+        if (dpids == null || dpids.size() == 0) {
+            return 0;
+        }
+        return stringToLong((String) dpids.toArray()[0]);
+    }
+
+    private long stringToLong(String values) {
+        long value = (new BigInteger(values.replaceAll(":", ""), 16))
+                .longValue();
+        return value;
+    }
+
+    /**
+     * Implementation of an Callback which is responsible for receiving request
+     * infomation from ovsdb.
+     */
+    private class InternalMonitorCallBack implements Callback {
+        @Override
+        public void update(UpdateNotification upadateNotification) {
+            Object key = upadateNotification.context();
+            OvsdbClientService ovsdbClient = requestNotification.get(key);
+
+            String dbName = requestDbName.get(key);
+            JsonNode updatesJson = upadateNotification.tbUpdatesJsonNode();
+            DatabaseSchema dbSchema = ovsdbClient.getDatabaseSchema(dbName);
+            TableUpdates updates = FromJsonUtil
+                    .jsonNodeToTableUpdates(updatesJson, dbSchema);
+            try {
+                processTableUpdates(ovsdbClient, updates, dbName);
+            } catch (InterruptedException e) {
+                log.warn("Interrupted while processing table updates");
+                Thread.currentThread().interrupt();
+            }
+        }
+
+        @Override
+        public void locked(List<String> ids) {
+            // TODO Auto-generated method stub
+        }
+
+        @Override
+        public void stolen(List<String> ids) {
+            // TODO Auto-generated method stub
+        }
+
+    }
+
+}
diff --git a/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/package-info.java b/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/package-info.java
new file mode 100644
index 0000000..379e947
--- /dev/null
+++ b/ovsdb/ctl/src/main/java/org/onosproject/ovsdb/controller/impl/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.
+ */
+
+/**
+ * Implementation of the OVSDB controller IO subsystem.
+ */
+package org.onosproject.ovsdb.controller.impl;
\ No newline at end of file