diff --git a/net/api/src/main/java/org/onlab/onos/net/ConnectPoint.java b/net/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
index f870698..8f332e9 100644
--- a/net/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
+++ b/net/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
@@ -2,7 +2,7 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.MoreObjects.toStringHelper;
+import com.google.common.base.MoreObjects;
 
 /**
  * Abstraction of a network connection point expressed as a pair of the
@@ -42,13 +42,12 @@
      * @throws java.lang.IllegalStateException if connection point is not
      *                                         associated with a device
      */
-    @SuppressWarnings("unchecked")
     public DeviceId deviceId() {
         if (elementId instanceof DeviceId) {
             return (DeviceId) elementId;
         }
         throw new IllegalStateException("Connection point not associated " +
-                                                "with an infrastructure device");
+                "with an infrastructure device");
     }
 
     /**
@@ -77,7 +76,7 @@
 
     @Override
     public String toString() {
-        return toStringHelper(this)
+        return MoreObjects.toStringHelper(this)
                 .add("elementId", elementId)
                 .add("portNumber", portNumber)
                 .toString();
diff --git a/net/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleLinkManager.java b/net/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleLinkManager.java
index c7b56c0..88d0663 100644
--- a/net/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleLinkManager.java
+++ b/net/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleLinkManager.java
@@ -1,6 +1,10 @@
 package org.onlab.onos.net.trivial.impl;
 
-import com.google.common.collect.Sets;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Set;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -24,10 +28,7 @@
 import org.onlab.onos.net.provider.AbstractProviderService;
 import org.slf4j.Logger;
 
-import java.util.Set;
-
-import static com.google.common.base.Preconditions.checkNotNull;
-import static org.slf4j.LoggerFactory.getLogger;
+import com.google.common.collect.Sets;
 
 /**
  * Provides basic implementation of the link SB &amp; NB APIs.
@@ -35,8 +36,8 @@
 @Component(immediate = true)
 @Service
 public class SimpleLinkManager
-        extends AbstractProviderRegistry<LinkProvider, LinkProviderService>
-        implements LinkService, LinkAdminService, LinkProviderRegistry {
+extends AbstractProviderRegistry<LinkProvider, LinkProviderService>
+implements LinkService, LinkAdminService, LinkProviderRegistry {
 
     private static final String DEVICE_ID_NULL = "Device ID cannot be null";
     private static final String LINK_DESC_NULL = "Link description cannot be null";
@@ -45,7 +46,7 @@
     private final Logger log = getLogger(getClass());
 
     private final AbstractListenerRegistry<LinkEvent, LinkListener>
-            listenerRegistry = new AbstractListenerRegistry<>();
+    listenerRegistry = new AbstractListenerRegistry<>();
 
     private final SimpleLinkStore store = new SimpleLinkStore();
 
@@ -83,7 +84,7 @@
     public Set<Link> getDeviceLinks(DeviceId deviceId) {
         checkNotNull(deviceId, DEVICE_ID_NULL);
         return Sets.union(store.getDeviceEgressLinks(deviceId),
-                          store.getDeviceIngressLinks(deviceId));
+                store.getDeviceIngressLinks(deviceId));
     }
 
     @Override
@@ -102,7 +103,7 @@
     public Set<Link> getLinks(ConnectPoint connectPoint) {
         checkNotNull(connectPoint, CONNECT_POINT_NULL);
         return Sets.union(store.getEgressLinks(connectPoint),
-                          store.getIngressLinks(connectPoint));
+                store.getIngressLinks(connectPoint));
     }
 
     @Override
@@ -146,7 +147,7 @@
 
     // Personalized link provider service issued to the supplied provider.
     private class InternalLinkProviderService extends AbstractProviderService<LinkProvider>
-            implements LinkProviderService {
+    implements LinkProviderService {
 
         InternalLinkProviderService(LinkProvider provider) {
             super(provider);
@@ -156,9 +157,9 @@
         public void linkDetected(LinkDescription linkDescription) {
             checkNotNull(linkDescription, LINK_DESC_NULL);
             checkValidity();
-            log.info("Link {} detected", linkDescription);
+            log.debug("Link {} detected", linkDescription);
             LinkEvent event = store.createOrUpdateLink(provider().id(),
-                                                       linkDescription);
+                    linkDescription);
             post(event);
         }
 
@@ -168,7 +169,7 @@
             checkValidity();
             log.info("Link {} vanished", linkDescription);
             LinkEvent event = store.removeLink(linkDescription.src(),
-                                               linkDescription.dst());
+                    linkDescription.dst());
             post(event);
         }
 
diff --git a/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java b/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
index 41c8adc..7ad2fec 100644
--- a/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
+++ b/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
@@ -1,8 +1,12 @@
 package org.onlab.onos.of.controller;
 
+import java.util.Collections;
+
 import org.onlab.packet.Ethernet;
 import org.projectfloodlight.openflow.protocol.OFPacketIn;
 import org.projectfloodlight.openflow.protocol.OFPacketOut;
+import org.projectfloodlight.openflow.protocol.action.OFAction;
+import org.projectfloodlight.openflow.types.OFBufferId;
 import org.projectfloodlight.openflow.types.OFPort;
 
 public final class DefaultPacketContext implements PacketContext {
@@ -11,7 +15,7 @@
     private boolean isBuilt = false;
     private final OpenFlowSwitch sw;
     private final OFPacketIn pktin;
-    private final OFPacketOut pktout = null;
+    private OFPacketOut pktout = null;
 
     private DefaultPacketContext(OpenFlowSwitch s, OFPacketIn pkt) {
         this.sw = s;
@@ -39,24 +43,41 @@
 
     @Override
     public void build(Ethernet ethFrame, OFPort outPort) {
-        // TODO Auto-generated method stub
-
+        if (isBuilt) {
+            return;
+        }
+        OFPacketOut.Builder builder = sw.factory().buildPacketOut();
+        OFAction act = sw.factory().actions()
+                .buildOutput()
+                .setPort(OFPort.of(outPort.getPortNumber()))
+                .build();
+        pktout = builder.setXid(pktin.getXid())
+                .setBufferId(OFBufferId.NO_BUFFER)
+                .setActions(Collections.singletonList(act))
+                .setData(ethFrame.serialize())
+                .build();
+        isBuilt = true;
     }
 
     @Override
     public Ethernet parsed() {
-        // TODO Auto-generated method stub
-        return null;
+        Ethernet eth = new Ethernet();
+        eth.deserialize(pktin.getData(), 0, pktin.getTotalLen());
+        return eth;
     }
 
     @Override
     public Dpid dpid() {
-        // TODO Auto-generated method stub
-        return null;
+        return new Dpid(sw.getId());
     }
 
     public static PacketContext packetContextFromPacketIn(OpenFlowSwitch s, OFPacketIn pkt) {
         return new DefaultPacketContext(s, pkt);
     }
 
+    @Override
+    public Integer inPort() {
+        return pktin.getInPort().getPortNumber();
+    }
+
 }
diff --git a/of/api/src/main/java/org/onlab/onos/of/controller/PacketContext.java b/of/api/src/main/java/org/onlab/onos/of/controller/PacketContext.java
index f7d434d..c4f785e 100644
--- a/of/api/src/main/java/org/onlab/onos/of/controller/PacketContext.java
+++ b/of/api/src/main/java/org/onlab/onos/of/controller/PacketContext.java
@@ -48,4 +48,10 @@
      * @return the dpid of the switch.
      */
     public Dpid dpid();
+
+    /**
+     * Provide the port on which the packet arrived.
+     * @return the port
+     */
+    public Integer inPort();
 }
diff --git a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OFChannelHandler.java b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OFChannelHandler.java
index 8af45e1..c85eb21 100644
--- a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OFChannelHandler.java
+++ b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OFChannelHandler.java
@@ -415,12 +415,14 @@
                 OFDescStatsReply drep = (OFDescStatsReply) m;
                 // Here is where we differentiate between different kinds of switches
                 h.sw = h.controller.getOFSwitchInstance(h.thisdpid, drep, h.ofVersion);
+
                 h.sw.setOFVersion(h.ofVersion);
                 h.sw.setFeaturesReply(h.featuresReply);
                 h.sw.setPortDescReply(h.portDescReply);
                 h.sw.setConnected(true);
                 h.sw.setChannel(h.channel);
                 boolean success = h.sw.connectSwitch();
+
                 if (!success) {
                     disconnectDuplicate(h);
                     return;
@@ -432,10 +434,10 @@
                 log.info("Switch {} bound to class {}, description {}",
                         new Object[] {h.sw, h.sw.getClass(), drep });
                 //Put switch in EQUAL mode until we hear back from the global registry
-                log.debug("Setting new switch {} to EQUAL and sending Role request",
-                        h.sw.getStringId());
-                h.sw.activateEqualSwitch();
-                h.setSwitchRole(RoleState.EQUAL);
+                //log.debug("Setting new switch {} to EQUAL and sending Role request",
+                //        h.sw.getStringId());
+                //h.sw.activateEqualSwitch();
+                //h.setSwitchRole(RoleState.EQUAL);
 
                 h.sw.startDriverHandshake();
                 h.setState(WAIT_SWITCH_DRIVER_SUB_HANDSHAKE);
diff --git a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OpenFlowControllerImpl.java b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OpenFlowControllerImpl.java
index 2b1d1da..2a27ba9 100644
--- a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OpenFlowControllerImpl.java
+++ b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/OpenFlowControllerImpl.java
@@ -1,9 +1,18 @@
 package org.onlab.onos.of.controller.impl;
 
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
 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.onos.of.controller.DefaultPacketContext;
 import org.onlab.onos.of.controller.Dpid;
 import org.onlab.onos.of.controller.OpenFlowController;
 import org.onlab.onos.of.controller.OpenFlowSwitch;
@@ -12,18 +21,11 @@
 import org.onlab.onos.of.controller.RoleState;
 import org.onlab.onos.of.controller.driver.OpenFlowAgent;
 import org.projectfloodlight.openflow.protocol.OFMessage;
+import org.projectfloodlight.openflow.protocol.OFPacketIn;
 import org.projectfloodlight.openflow.protocol.OFPortStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
-
 @Component(immediate = true)
 @Service
 public class OpenFlowControllerImpl implements OpenFlowController {
@@ -42,238 +44,244 @@
     protected Set<OpenFlowSwitchListener> ofEventListener =
             new HashSet<>();
 
-    protected List<PacketListener> ofPacketListener =
-            new ArrayList<>();
+            protected List<PacketListener> ofPacketListener =
+                    new ArrayList<>();
 
-    private final Controller ctrl = new Controller();
+                    private final Controller ctrl = new Controller();
 
-    @Activate
-    public void activate() {
-        ctrl.start(agent);
-    }
+                    @Activate
+                    public void activate() {
+                        ctrl.start(agent);
+                    }
 
-    @Deactivate
-    public void deactivate() {
-        ctrl.stop();
-    }
+                    @Deactivate
+                    public void deactivate() {
+                        ctrl.stop();
+                    }
 
-    @Override
-    public Iterable<OpenFlowSwitch> getSwitches() {
-        return connectedSwitches.values();
-    }
+                    @Override
+                    public Iterable<OpenFlowSwitch> getSwitches() {
+                        return connectedSwitches.values();
+                    }
 
-    @Override
-    public Iterable<OpenFlowSwitch> getMasterSwitches() {
-        return activeMasterSwitches.values();
-    }
+                    @Override
+                    public Iterable<OpenFlowSwitch> getMasterSwitches() {
+                        return activeMasterSwitches.values();
+                    }
 
-    @Override
-    public Iterable<OpenFlowSwitch> getEqualSwitches() {
-        return activeEqualSwitches.values();
-    }
+                    @Override
+                    public Iterable<OpenFlowSwitch> getEqualSwitches() {
+                        return activeEqualSwitches.values();
+                    }
 
-    @Override
-    public OpenFlowSwitch getSwitch(Dpid dpid) {
-        return connectedSwitches.get(dpid);
-    }
+                    @Override
+                    public OpenFlowSwitch getSwitch(Dpid dpid) {
+                        return connectedSwitches.get(dpid);
+                    }
 
-    @Override
-    public OpenFlowSwitch getMasterSwitch(Dpid dpid) {
-        return activeMasterSwitches.get(dpid);
-    }
+                    @Override
+                    public OpenFlowSwitch getMasterSwitch(Dpid dpid) {
+                        return activeMasterSwitches.get(dpid);
+                    }
 
-    @Override
-    public OpenFlowSwitch getEqualSwitch(Dpid dpid) {
-        return activeEqualSwitches.get(dpid);
-    }
+                    @Override
+                    public OpenFlowSwitch getEqualSwitch(Dpid dpid) {
+                        return activeEqualSwitches.get(dpid);
+                    }
 
-    @Override
-    public void addListener(OpenFlowSwitchListener listener) {
-        if (!ofEventListener.contains(listener)) {
-            this.ofEventListener.add(listener);
-        }
-    }
+                    @Override
+                    public void addListener(OpenFlowSwitchListener listener) {
+                        if (!ofEventListener.contains(listener)) {
+                            this.ofEventListener.add(listener);
+                        }
+                    }
 
-    @Override
-    public void removeListener(OpenFlowSwitchListener listener) {
-        this.ofEventListener.remove(listener);
-    }
+                    @Override
+                    public void removeListener(OpenFlowSwitchListener listener) {
+                        this.ofEventListener.remove(listener);
+                    }
 
-    @Override
-    public void addPacketListener(int priority, PacketListener listener) {
-        ofPacketListener.add(priority, listener);
-    }
+                    @Override
+                    public void addPacketListener(int priority, PacketListener listener) {
+                        ofPacketListener.add(priority, listener);
+                    }
 
-    @Override
-    public void removePacketListener(PacketListener listener) {
-        ofPacketListener.remove(listener);
-    }
+                    @Override
+                    public void removePacketListener(PacketListener listener) {
+                        ofPacketListener.remove(listener);
+                    }
 
-    @Override
-    public void write(Dpid dpid, OFMessage msg) {
-        this.getSwitch(dpid).sendMsg(msg);
-    }
+                    @Override
+                    public void write(Dpid dpid, OFMessage msg) {
+                        this.getSwitch(dpid).sendMsg(msg);
+                    }
 
-    @Override
-    public void processPacket(Dpid dpid, OFMessage msg) {
-        switch (msg.getType()) {
-            case PORT_STATUS:
-                for (OpenFlowSwitchListener l : ofEventListener) {
-                    l.portChanged(dpid, (OFPortStatus) msg);
-                }
-                break;
-            case PACKET_IN:
-                for (PacketListener p : ofPacketListener) {
-                    //TODO fix me!
-                    p.handlePacket(null);
-                }
-                break;
-            default:
-                log.warn("Handling message type {} not yet implemented", msg.getType());
-        }
-    }
+                    @Override
+                    public void processPacket(Dpid dpid, OFMessage msg) {
+                        switch (msg.getType()) {
+                        case PORT_STATUS:
+                            for (OpenFlowSwitchListener l : ofEventListener) {
+                                l.portChanged(dpid, (OFPortStatus) msg);
+                            }
+                            break;
+                        case PACKET_IN:
+                            for (PacketListener p : ofPacketListener) {
+                                //TODO fix me!
+                                p.handlePacket(DefaultPacketContext
+                                        .packetContextFromPacketIn(this.getSwitch(dpid),
+                                                (OFPacketIn) msg));
+                            }
+                            break;
+                        default:
+                            log.warn("Handling message type {} not yet implemented {}",
+                                    msg.getType(), msg);
+                        }
+                    }
 
-    @Override
-    public void setRole(Dpid dpid, RoleState role) {
-        getSwitch(dpid).setRole(role);
-    }
+                    @Override
+                    public void setRole(Dpid dpid, RoleState role) {
+                        getSwitch(dpid).setRole(role);
+                    }
 
-    /**
-     * Implementation of an OpenFlow Agent which is responsible for
-     * keeping track of connected switches and the state in which
-     * they are.
-     */
-    public class OpenFlowSwitchAgent implements OpenFlowAgent {
+                    /**
+                     * Implementation of an OpenFlow Agent which is responsible for
+                     * keeping track of connected switches and the state in which
+                     * they are.
+                     */
+                    public class OpenFlowSwitchAgent implements OpenFlowAgent {
 
-        private final Logger log = LoggerFactory.getLogger(OpenFlowSwitchAgent.class);
-        private final Lock switchLock = new ReentrantLock();
+                        private final Logger log = LoggerFactory.getLogger(OpenFlowSwitchAgent.class);
+                        private final Lock switchLock = new ReentrantLock();
 
-        @Override
-        public boolean addConnectedSwitch(Dpid dpid, OpenFlowSwitch sw) {
-            if (connectedSwitches.get(dpid) != null) {
-                log.error("Trying to add connectedSwitch but found a previous "
-                                  + "value for dpid: {}", dpid);
-                return false;
-            } else {
-                log.error("Added switch {}", dpid);
-                connectedSwitches.put(dpid, sw);
-                for (OpenFlowSwitchListener l : ofEventListener) {
-                    l.switchAdded(dpid);
-                }
-                return true;
-            }
-        }
+                        @Override
+                        public boolean addConnectedSwitch(Dpid dpid, OpenFlowSwitch sw) {
+                            if (connectedSwitches.get(dpid) != null) {
+                                log.error("Trying to add connectedSwitch but found a previous "
+                                        + "value for dpid: {}", dpid);
+                                return false;
+                            } else {
+                                log.error("Added switch {}", dpid);
+                                connectedSwitches.put(dpid, sw);
+                                for (OpenFlowSwitchListener l : ofEventListener) {
+                                    l.switchAdded(dpid);
+                                }
+                                return true;
+                            }
+                        }
 
-        @Override
-        public boolean validActivation(Dpid dpid) {
-            if (connectedSwitches.get(dpid) == null) {
-                log.error("Trying to activate switch but is not in "
-                                  + "connected switches: dpid {}. Aborting ..",
-                          dpid);
-                return false;
-            }
-            if (activeMasterSwitches.get(dpid) != null ||
-                    activeEqualSwitches.get(dpid) != null) {
-                log.error("Trying to activate switch but it is already "
-                                  + "activated: dpid {}. Found in activeMaster: {} "
-                                  + "Found in activeEqual: {}. Aborting ..", new Object[]{
-                        dpid,
-                        (activeMasterSwitches.get(dpid) == null) ? 'N' : 'Y',
-                        (activeEqualSwitches.get(dpid) == null) ? 'N' : 'Y'});
-                return false;
-            }
-            return true;
-        }
+                        @Override
+                        public boolean validActivation(Dpid dpid) {
+                            if (connectedSwitches.get(dpid) == null) {
+                                log.error("Trying to activate switch but is not in "
+                                        + "connected switches: dpid {}. Aborting ..",
+                                        dpid);
+                                return false;
+                            }
+                            if (activeMasterSwitches.get(dpid) != null ||
+                                    activeEqualSwitches.get(dpid) != null) {
+                                log.error("Trying to activate switch but it is already "
+                                        + "activated: dpid {}. Found in activeMaster: {} "
+                                        + "Found in activeEqual: {}. Aborting ..", new Object[]{
+                                                dpid,
+                                                (activeMasterSwitches.get(dpid) == null) ? 'N' : 'Y',
+                                                        (activeEqualSwitches.get(dpid) == null) ? 'N' : 'Y'});
+                                return false;
+                            }
+                            return true;
+                        }
 
 
-        @Override
-        public boolean addActivatedMasterSwitch(Dpid dpid, OpenFlowSwitch sw) {
-            switchLock.lock();
-            try {
-                if (!validActivation(dpid)) {
-                    return false;
-                }
-                activeMasterSwitches.put(dpid, sw);
-                return true;
-            } finally {
-                switchLock.unlock();
-            }
-        }
+                        @Override
+                        public boolean addActivatedMasterSwitch(Dpid dpid, OpenFlowSwitch sw) {
+                            switchLock.lock();
+                            try {
+                                if (!validActivation(dpid)) {
+                                    return false;
+                                }
+                                activeMasterSwitches.put(dpid, sw);
+                                return true;
+                            } finally {
+                                switchLock.unlock();
+                            }
+                        }
 
-        @Override
-        public boolean addActivatedEqualSwitch(Dpid dpid, OpenFlowSwitch sw) {
-            switchLock.lock();
-            try {
-                if (!validActivation(dpid)) {
-                    return false;
-                }
-                activeEqualSwitches.put(dpid, sw);
-                log.info("Added Activated EQUAL Switch {}", dpid);
-                return true;
-            } finally {
-                switchLock.unlock();
-            }
-        }
+                        @Override
+                        public boolean addActivatedEqualSwitch(Dpid dpid, OpenFlowSwitch sw) {
+                            switchLock.lock();
+                            try {
+                                if (!validActivation(dpid)) {
+                                    return false;
+                                }
+                                activeEqualSwitches.put(dpid, sw);
+                                log.info("Added Activated EQUAL Switch {}", dpid);
+                                return true;
+                            } finally {
+                                switchLock.unlock();
+                            }
+                        }
 
-        @Override
-        public void transitionToMasterSwitch(Dpid dpid) {
-            switchLock.lock();
-            try {
-                if (activeMasterSwitches.containsKey(dpid)) {
-                    return;
-                }
-                OpenFlowSwitch sw = activeEqualSwitches.remove(dpid);
-                if (sw == null) {
-                    log.error("Transition to master called on sw {}, but switch "
-                                      + "was not found in controller-cache", dpid);
-                    return;
-                }
-                log.info("Transitioned switch {} to MASTER", dpid);
-                activeMasterSwitches.put(dpid, sw);
-            } finally {
-                switchLock.unlock();
-            }
-        }
+                        @Override
+                        public void transitionToMasterSwitch(Dpid dpid) {
+                            switchLock.lock();
+                            try {
+                                if (activeMasterSwitches.containsKey(dpid)) {
+                                    return;
+                                }
+                                OpenFlowSwitch sw = activeEqualSwitches.remove(dpid);
+                                if (sw == null) {
+                                    sw = getSwitch(dpid);
+                                    if (sw == null) {
+                                        log.error("Transition to master called on sw {}, but switch "
+                                                + "was not found in controller-cache", dpid);
+                                        return;
+                                    }
+                                }
+                                log.info("Transitioned switch {} to MASTER", dpid);
+                                activeMasterSwitches.put(dpid, sw);
+                            } finally {
+                                switchLock.unlock();
+                            }
+                        }
 
 
-        @Override
-        public void transitionToEqualSwitch(Dpid dpid) {
-            switchLock.lock();
-            try {
-                if (activeEqualSwitches.containsKey(dpid)) {
-                    return;
-                }
-                OpenFlowSwitch sw = activeMasterSwitches.remove(dpid);
-                if (sw == null) {
-                    log.error("Transition to equal called on sw {}, but switch "
-                                      + "was not found in controller-cache", dpid);
-                    return;
-                }
-                log.info("Transitioned switch {} to EQUAL", dpid);
-                activeEqualSwitches.put(dpid, sw);
-            } finally {
-                switchLock.unlock();
-            }
+                        @Override
+                        public void transitionToEqualSwitch(Dpid dpid) {
+                            switchLock.lock();
+                            try {
+                                if (activeEqualSwitches.containsKey(dpid)) {
+                                    return;
+                                }
+                                OpenFlowSwitch sw = activeMasterSwitches.remove(dpid);
+                                if (sw == null) {
+                                    log.error("Transition to equal called on sw {}, but switch "
+                                            + "was not found in controller-cache", dpid);
+                                    return;
+                                }
+                                log.info("Transitioned switch {} to EQUAL", dpid);
+                                activeEqualSwitches.put(dpid, sw);
+                            } finally {
+                                switchLock.unlock();
+                            }
 
-        }
+                        }
 
-        @Override
-        public void removeConnectedSwitch(Dpid dpid) {
-            connectedSwitches.remove(dpid);
-            OpenFlowSwitch sw = activeMasterSwitches.remove(dpid);
-            if (sw == null) {
-                sw = activeEqualSwitches.remove(dpid);
-            }
-            for (OpenFlowSwitchListener l : ofEventListener) {
-                l.switchRemoved(dpid);
-            }
-        }
+                        @Override
+                        public void removeConnectedSwitch(Dpid dpid) {
+                            connectedSwitches.remove(dpid);
+                            OpenFlowSwitch sw = activeMasterSwitches.remove(dpid);
+                            if (sw == null) {
+                                sw = activeEqualSwitches.remove(dpid);
+                            }
+                            for (OpenFlowSwitchListener l : ofEventListener) {
+                                l.switchRemoved(dpid);
+                            }
+                        }
 
-        @Override
-        public void processMessage(Dpid dpid, OFMessage m) {
-            processPacket(dpid, m);
-        }
-    }
+                        @Override
+                        public void processMessage(Dpid dpid, OFMessage m) {
+                            processPacket(dpid, m);
+                        }
+                    }
 
 
 }
diff --git a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/RoleManager.java b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/RoleManager.java
index f82a46c..f2e9581 100644
--- a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/RoleManager.java
+++ b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/RoleManager.java
@@ -84,7 +84,7 @@
         default:
             // ensuring that the only two roles sent to 1.0 switches with
             // Nicira role support, are MASTER and SLAVE
-            roleToSend = OFNiciraControllerRole.ROLE_SLAVE;
+            roleToSend = OFNiciraControllerRole.ROLE_OTHER;
             log.warn("Sending Nx Role.SLAVE to switch {}.", sw);
         }
         int xid = sw.getNextTransactionId();
diff --git a/of/ctl/src/main/java/org/onlab/onos/of/drivers/impl/OFSwitchImplOVS10.java b/of/ctl/src/main/java/org/onlab/onos/of/drivers/impl/OFSwitchImplOVS10.java
index b9ee4c9..0de661b 100644
--- a/of/ctl/src/main/java/org/onlab/onos/of/drivers/impl/OFSwitchImplOVS10.java
+++ b/of/ctl/src/main/java/org/onlab/onos/of/drivers/impl/OFSwitchImplOVS10.java
@@ -50,8 +50,7 @@
 
     @Override
     public void write(OFMessage msg) {
-        channel.write(msg);
-
+        channel.write(Collections.singletonList(msg));
     }
 
     @Override
diff --git a/pom.xml b/pom.xml
index 25557a1..9fc49c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,6 +61,14 @@
                 <version>18.0</version>
             </dependency>
 
+             <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty</artifactId>
+                <version>3.9.0.Final</version>
+            </dependency>
+
+
+
             <dependency>
                 <groupId>com.google.guava</groupId>
                 <artifactId>guava-testlib</artifactId>
diff --git a/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java
new file mode 100644
index 0000000..9396f91
--- /dev/null
+++ b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java
@@ -0,0 +1,395 @@
+/*******************************************************************************
+ * 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.onlab.onos.provider.of.link.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.jboss.netty.util.Timeout;
+import org.jboss.netty.util.TimerTask;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Link.Type;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.link.DefaultLinkDescription;
+import org.onlab.onos.net.link.LinkDescription;
+import org.onlab.onos.net.link.LinkProviderService;
+import org.onlab.onos.of.controller.Dpid;
+import org.onlab.onos.of.controller.OpenFlowController;
+import org.onlab.onos.of.controller.OpenFlowSwitch;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.ONLabLddp;
+import org.onlab.packet.ONLabLddp.DPIDandPort;
+import org.onlab.timer.Timer;
+import org.projectfloodlight.openflow.protocol.OFFactory;
+import org.projectfloodlight.openflow.protocol.OFMessage;
+import org.projectfloodlight.openflow.protocol.OFPacketOut;
+import org.projectfloodlight.openflow.protocol.OFPortDesc;
+import org.projectfloodlight.openflow.protocol.action.OFAction;
+import org.projectfloodlight.openflow.protocol.action.OFActionOutput;
+import org.projectfloodlight.openflow.types.OFBufferId;
+import org.projectfloodlight.openflow.types.OFPort;
+import org.slf4j.Logger;
+
+
+
+/**
+ * Run discovery process from a physical switch. Ports are initially labeled as
+ * slow ports. When an LLDP is successfully received, label the remote port as
+ * fast. Every probeRate milliseconds, loop over all fast ports and send an
+ * LLDP, send an LLDP for a single slow port. Based on FlowVisor topology
+ * discovery implementation.
+ *
+ * TODO: add 'fast discovery' mode: drop LLDPs in destination switch but listen
+ * for flow_removed messages
+ */
+public class LinkDiscovery implements TimerTask {
+
+    private final OpenFlowSwitch sw;
+    // send 1 probe every probeRate milliseconds
+    private final long probeRate;
+    private final Set<Integer> slowPorts;
+    private final Set<Integer> fastPorts;
+    // number of unacknowledged probes per port
+    private final Map<Integer, AtomicInteger> portProbeCount;
+    // number of probes to send before link is removed
+    private static final short MAX_PROBE_COUNT = 3;
+    private Iterator<Integer> slowIterator;
+    private final OFFactory ofFactory;
+    private final Logger log = getLogger(getClass());
+    private final ONLabLddp lldpPacket;
+    private final Ethernet ethPacket;
+    private Ethernet bddpEth;
+    private final boolean useBDDP;
+    private final OpenFlowController ctrl;
+    private final LinkProviderService linkProvider;
+
+    /**
+     * Instantiates discovery manager for the given physical switch. Creates a
+     * generic LLDP packet that will be customized for the port it is sent out on.
+     * Starts the the timer for the discovery process.
+     *
+     * @param sw the physical switch
+     * @param useBDDP flag to also use BDDP for discovery
+     */
+    public LinkDiscovery(final OpenFlowSwitch sw,
+            OpenFlowController ctrl, LinkProviderService providerService, Boolean... useBDDP) {
+        this.sw = sw;
+        this.ofFactory = sw.factory();
+        this.ctrl = ctrl;
+        this.probeRate = 1000;
+        this.linkProvider = providerService;
+        this.slowPorts = Collections.synchronizedSet(new HashSet<Integer>());
+        this.fastPorts = Collections.synchronizedSet(new HashSet<Integer>());
+        this.portProbeCount = new HashMap<Integer, AtomicInteger>();
+        this.lldpPacket = new ONLabLddp();
+        this.lldpPacket.setSwitch(this.sw.getId());
+        this.ethPacket = new Ethernet();
+        this.ethPacket.setEtherType(Ethernet.TYPE_LLDP);
+        this.ethPacket.setDestinationMACAddress(ONLabLddp.LLDP_NICIRA);
+        this.ethPacket.setPayload(this.lldpPacket);
+        this.ethPacket.setPad(true);
+        this.useBDDP = useBDDP.length > 0 ? useBDDP[0] : false;
+        if (this.useBDDP) {
+            this.bddpEth = new Ethernet();
+            this.bddpEth.setPayload(this.lldpPacket);
+            this.bddpEth.setEtherType(Ethernet.TYPE_BSN);
+            this.bddpEth.setDestinationMACAddress(ONLabLddp.BDDP_MULTICAST);
+            this.bddpEth.setPad(true);
+            log.info("Using BDDP to discover network");
+        }
+        for (OFPortDesc port : sw.getPorts()) {
+            if (port.getPortNo() != OFPort.LOCAL) {
+                addPort(port);
+            }
+        }
+        Timer.getTimer().newTimeout(this, this.probeRate,
+                TimeUnit.MILLISECONDS);
+        this.log.debug("Started discovery manager for switch {}",
+                sw.getId());
+
+    }
+
+    /**
+     * Add physical port port to discovery process.
+     * Send out initial LLDP and label it as slow port.
+     *
+     * @param port the port
+     */
+    public void addPort(final OFPortDesc port) {
+        // Ignore ports that are not on this switch, or already booted. */
+
+        synchronized (this) {
+            this.log.debug("sending init probe to port {}",
+                    port.getPortNo().getPortNumber());
+            OFPacketOut pkt;
+
+            pkt = this.createLLDPPacketOut(port);
+            this.sw.sendMsg(pkt);
+            if (useBDDP) {
+                OFPacketOut bpkt = this.createBDDPPacketOut(port);
+                this.sw.sendMsg(bpkt);
+            }
+
+            this.slowPorts.add(port.getPortNo().getPortNumber());
+            this.slowIterator = this.slowPorts.iterator();
+        }
+
+    }
+
+    /**
+     * Removes physical port from discovery process.
+     *
+     * @param port the port
+     */
+    public void removePort(final OFPort port) {
+        // Ignore ports that are not on this switch
+
+        int portnum = port.getPortNumber();
+        synchronized (this) {
+            if (this.slowPorts.contains(portnum)) {
+                this.slowPorts.remove(portnum);
+                this.slowIterator = this.slowPorts.iterator();
+
+            } else if (this.fastPorts.contains(portnum)) {
+                this.fastPorts.remove(portnum);
+                this.portProbeCount.remove(portnum);
+                // no iterator to update
+            } else {
+                this.log.warn(
+                        "tried to dynamically remove non-existing port {}",
+                        portnum);
+            }
+        }
+
+    }
+
+    /**
+     * Method called by remote port to acknowledge receipt of LLDP sent by
+     * this port. If slow port, updates label to fast. If fast port, decrements
+     * number of unacknowledged probes.
+     *
+     * @param port the port
+     */
+    public void ackProbe(final Integer port) {
+        final int portNumber = port;
+        synchronized (this) {
+            if (this.slowPorts.contains(portNumber)) {
+                this.log.debug("Setting slow port to fast: {}:{}",
+                        this.sw.getId(), portNumber);
+                this.slowPorts.remove(portNumber);
+                this.slowIterator = this.slowPorts.iterator();
+                this.fastPorts.add(portNumber);
+                this.portProbeCount.put(portNumber, new AtomicInteger(0));
+            } else {
+                if (this.fastPorts.contains(portNumber)) {
+                    this.portProbeCount.get(portNumber).set(0);
+                } else {
+                    this.log.debug(
+                            "Got ackProbe for non-existing port: {}",
+                            portNumber);
+                }
+            }
+        }
+    }
+
+    /**
+     * Creates packet_out LLDP for specified output port.
+     *
+     * @param port the port
+     * @return Packet_out message with LLDP data
+     * @throws PortMappingException
+     */
+    private OFPacketOut createLLDPPacketOut(final OFPortDesc port) {
+        OFPacketOut.Builder packetOut = this.ofFactory.buildPacketOut();
+        packetOut.setBufferId(OFBufferId.NO_BUFFER);
+        OFAction act = this.ofFactory.actions().buildOutput()
+                .setPort(port.getPortNo()).build();
+        packetOut.setActions(Collections.singletonList(act));
+        this.lldpPacket.setPort(port.getPortNo().getPortNumber());
+        this.ethPacket.setSourceMACAddress(port.getHwAddr().getBytes());
+
+        final byte[] lldp = this.ethPacket.serialize();
+        packetOut.setData(lldp);
+        return packetOut.build();
+    }
+
+    /**
+     * Creates packet_out BDDP for specified output port.
+     *
+     * @param port the port
+     * @return Packet_out message with LLDP data
+     * @throws PortMappingException
+     */
+    private OFPacketOut createBDDPPacketOut(final OFPortDesc port) {
+        OFPacketOut.Builder packetOut = sw.factory().buildPacketOut();
+
+        packetOut.setBufferId(OFBufferId.NO_BUFFER);
+
+        OFActionOutput.Builder act = sw.factory().actions().buildOutput()
+                .setPort(port.getPortNo());
+        OFAction out = act.build();
+        packetOut.setActions(Collections.singletonList(out));
+        this.lldpPacket.setPort(port.getPortNo().getPortNumber());
+        this.bddpEth.setSourceMACAddress(port.getHwAddr().getBytes());
+
+        final byte[] bddp = this.bddpEth.serialize();
+        packetOut.setData(bddp);
+
+        return packetOut.build();
+    }
+
+
+    private void sendMsg(final OFMessage msg) {
+        this.sw.sendMsg(msg);
+    }
+
+    public String getName() {
+        return "LinkDiscovery " + this.sw.getStringId();
+    }
+
+    /*
+     * Handles an incoming LLDP packet. Creates link in topology and sends ACK
+     * to port where LLDP originated.
+     */
+    @SuppressWarnings("rawtypes")
+    public void handleLLDP(final Ethernet eth, Integer inPort) {
+
+        final byte[] pkt = eth.serialize();
+
+        if (ONLabLddp.isOVXLLDP(pkt)) {
+            final Integer dstPort = inPort;
+            final DPIDandPort dp = ONLabLddp.parseLLDP(pkt);
+            final OpenFlowSwitch srcSwitch = ctrl.getSwitch(new Dpid(dp.getDpid()));
+            final Integer srcPort = dp.getPort();
+            if (srcSwitch == null) {
+                return;
+            }
+            this.ackProbe(srcPort);
+            ConnectPoint src = new ConnectPoint(
+                    DeviceId.deviceId("of:" + Long.toHexString(srcSwitch.getId())),
+                    PortNumber.portNumber(srcPort));
+
+            ConnectPoint dst = new ConnectPoint(
+                    DeviceId.deviceId("of:" + Long.toHexString(sw.getId())),
+                    PortNumber.portNumber(dstPort));
+            LinkDescription ld;
+            if (eth.getEtherType() == Ethernet.TYPE_BSN) {
+                ld = new DefaultLinkDescription(src, dst, Type.INDIRECT);
+            } else {
+                ld = new DefaultLinkDescription(src, dst, Type.DIRECT);
+            }
+            linkProvider.linkDetected(ld);
+        } else {
+            this.log.debug("Ignoring unknown LLDP");
+        }
+    }
+
+    private OFPortDesc findPort(List<OFPortDesc> ports, Integer inPort) {
+        for (OFPortDesc p : ports) {
+            if (p.getPortNo().getPortNumber() == inPort) {
+                return p;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Execute this method every t milliseconds. Loops over all ports
+     * labeled as fast and sends out an LLDP. Send out an LLDP on a single slow
+     * port.
+     *
+     * @param t timeout
+     * @throws Exception
+     */
+    @Override
+    public void run(final Timeout t) {
+        this.log.debug("sending probes");
+        synchronized (this) {
+            final Iterator<Integer> fastIterator = this.fastPorts.iterator();
+            while (fastIterator.hasNext()) {
+                final Integer portNumber = fastIterator.next();
+                final int probeCount = this.portProbeCount.get(portNumber)
+                        .getAndIncrement();
+                OFPortDesc port = findPort(this.sw.getPorts(), portNumber);
+                if (probeCount < LinkDiscovery.MAX_PROBE_COUNT) {
+                    this.log.debug("sending fast probe to port");
+
+                    OFPacketOut pkt = this.createLLDPPacketOut(port);
+                    this.sendMsg(pkt);
+                    if (useBDDP) {
+                        OFPacketOut bpkt = this.createBDDPPacketOut(port);
+                        this.sendMsg(bpkt);
+                    }
+                } else {
+                    // Update fast and slow ports
+                    fastIterator.remove();
+                    this.slowPorts.add(portNumber);
+                    this.slowIterator = this.slowPorts.iterator();
+                    this.portProbeCount.remove(portNumber);
+
+                    // Remove link from topology
+                    final OFPortDesc srcPort = port;
+
+                    ConnectPoint cp = new ConnectPoint(
+                            DeviceId.deviceId("of:" + Long.toHexString(sw.getId())),
+                            PortNumber.portNumber(srcPort.getPortNo().getPortNumber()));
+                    linkProvider.linksVanished(cp);
+                }
+            }
+
+            // send a probe for the next slow port
+            if (this.slowPorts.size() > 0) {
+                if (!this.slowIterator.hasNext()) {
+                    this.slowIterator = this.slowPorts.iterator();
+                }
+                if (this.slowIterator.hasNext()) {
+                    final int portNumber = this.slowIterator.next();
+                    this.log.debug("sending slow probe to port {}", portNumber);
+                    OFPortDesc port = findPort(this.sw.getPorts(), portNumber);
+
+                    OFPacketOut pkt = this.createLLDPPacketOut(port);
+                    this.sendMsg(pkt);
+                    if (useBDDP) {
+                        OFPacketOut bpkt = this.createBDDPPacketOut(port);
+                        this.sendMsg(bpkt);
+                    }
+
+                }
+            }
+        }
+
+        // reschedule timer
+        Timer.getTimer().newTimeout(this, this.probeRate,
+                TimeUnit.MILLISECONDS);
+    }
+
+    public void removeAllPorts() {
+        for (OFPortDesc port : sw.getPorts()) {
+            removePort(port.getPortNo());
+        }
+    }
+
+}
diff --git a/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/OpenFlowLinkProvider.java b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/OpenFlowLinkProvider.java
index ed9d970..737ef00 100644
--- a/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/OpenFlowLinkProvider.java
+++ b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/OpenFlowLinkProvider.java
@@ -2,19 +2,32 @@
 
 import static org.slf4j.LoggerFactory.getLogger;
 
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.PortNumber;
 import org.onlab.onos.net.link.LinkProvider;
 import org.onlab.onos.net.link.LinkProviderRegistry;
 import org.onlab.onos.net.link.LinkProviderService;
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
+import org.onlab.onos.of.controller.Dpid;
 import org.onlab.onos.of.controller.OpenFlowController;
+import org.onlab.onos.of.controller.OpenFlowSwitchListener;
 import org.onlab.onos.of.controller.PacketContext;
 import org.onlab.onos.of.controller.PacketListener;
+import org.onlab.timer.Timer;
+import org.projectfloodlight.openflow.protocol.OFPortConfig;
+import org.projectfloodlight.openflow.protocol.OFPortDesc;
+import org.projectfloodlight.openflow.protocol.OFPortState;
+import org.projectfloodlight.openflow.protocol.OFPortStatus;
 import org.slf4j.Logger;
 
 /**
@@ -34,7 +47,9 @@
 
     private LinkProviderService providerService;
 
-    private final PacketListener listener = new InternalLinkProvider();
+    private final boolean useBDDP = true;
+
+    private final InternalLinkProvider listener = new InternalLinkProvider();
 
     /**
      * Creates an OpenFlow link provider.
@@ -46,6 +61,7 @@
     @Activate
     public void activate() {
         providerService = providerRegistry.register(this);
+        controller.addListener(listener);
         controller.addPacketListener(0, listener);
         log.info("Started");
     }
@@ -53,16 +69,64 @@
     @Deactivate
     public void deactivate() {
         providerRegistry.unregister(this);
+        controller.removeListener(listener);
         controller.removePacketListener(listener);
         providerService = null;
+        Timer.getTimer().stop();
         log.info("Stopped");
     }
 
 
-    private class InternalLinkProvider implements PacketListener {
+    private class InternalLinkProvider implements PacketListener, OpenFlowSwitchListener {
+
+        private final Map<Dpid, LinkDiscovery> discoverers = new ConcurrentHashMap<>();
 
         @Override
         public void handlePacket(PacketContext pktCtx) {
+            LinkDiscovery ld = discoverers.get(pktCtx.dpid());
+            if (ld == null) {
+                return;
+            }
+            ld.handleLLDP(pktCtx.parsed(),
+                    pktCtx.inPort());
+
+        }
+
+        @Override
+        public void switchAdded(Dpid dpid) {
+            discoverers.put(dpid, new LinkDiscovery(controller.getSwitch(dpid),
+                    controller, providerService, useBDDP));
+
+        }
+
+        @Override
+        public void switchRemoved(Dpid dpid) {
+            LinkDiscovery ld = this.discoverers.remove(dpid);
+            if (ld != null) {
+                ld.removeAllPorts();
+            }
+            providerService.linksVanished(
+                    DeviceId.deviceId("of:" + Long.toHexString(dpid.value())));
+        }
+
+        @Override
+        public void portChanged(Dpid dpid, OFPortStatus status) {
+            LinkDiscovery ld = discoverers.get(dpid);
+            if (ld == null) {
+                return;
+            }
+            final OFPortDesc port = status.getDesc();
+            final boolean enabled = !port.getState().contains(OFPortState.LINK_DOWN) &&
+                    !port.getConfig().contains(OFPortConfig.PORT_DOWN);
+            if (enabled) {
+                ld.addPort(port);
+            } else {
+                ConnectPoint cp = new ConnectPoint(
+                        DeviceId.deviceId("of:" + Long.toHexString(dpid.value())),
+                        PortNumber.portNumber(port.getPortNo().getPortNumber()));
+                providerService.linksVanished(cp);
+                ld.removePort(port.getPortNo());
+            }
 
         }
 
diff --git a/utils/misc/pom.xml b/utils/misc/pom.xml
index c39fd32..5b19401 100644
--- a/utils/misc/pom.xml
+++ b/utils/misc/pom.xml
@@ -22,7 +22,10 @@
             <artifactId>guava-testlib</artifactId>
             <scope>test</scope>
         </dependency>
-
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty</artifactId>
+        </dependency>
         <dependency>
             <groupId>commons-lang</groupId>
             <artifactId>commons-lang</artifactId>
diff --git a/utils/misc/src/main/java/org/onlab/packet/OVXLLDP.java b/utils/misc/src/main/java/org/onlab/packet/ONLabLddp.java
similarity index 87%
rename from utils/misc/src/main/java/org/onlab/packet/OVXLLDP.java
rename to utils/misc/src/main/java/org/onlab/packet/ONLabLddp.java
index f1a4b5f..520d670 100644
--- a/utils/misc/src/main/java/org/onlab/packet/OVXLLDP.java
+++ b/utils/misc/src/main/java/org/onlab/packet/ONLabLddp.java
@@ -21,6 +21,8 @@
 import java.util.List;
 
 import org.apache.commons.lang.ArrayUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 
 /**
@@ -29,8 +31,9 @@
  *
  */
 @SuppressWarnings("rawtypes")
-public class OVXLLDP extends LLDP {
+public class ONLabLddp extends LLDP {
 
+    private static final Logger log = LoggerFactory.getLogger(ONLabLddp.class);
     // ON.Lab OUI and OVX name for organizationally specific TLVs
     public static final byte[] ONLAB_OUI = {(byte) 0xa4, 0x23, 0x05};
     public static final String OVX_NAME = "OpenVirteX";
@@ -50,7 +53,7 @@
     private static final byte CHASSIS_TLV_SUBTYPE = 4;
 
     private static final byte PORT_TLV_TYPE = 2;
-    private static final byte PORT_TLV_SIZE = 7;
+    private static final byte PORT_TLV_SIZE = 5;
     private static final byte PORT_TLV_SUBTYPE = 2;
 
     private static final byte TTL_TLV_TYPE = 3;
@@ -58,9 +61,9 @@
 
     private static final byte NAME_TLV_TYPE = 127;
     // 4 = OUI (3) + subtype (1)
-    private static final byte NAME_TLV_SIZE = (byte) (4 + OVXLLDP.OVX_NAME.length());
+    private static final byte NAME_TLV_SIZE = (byte) (4 + ONLabLddp.OVX_NAME.length());
     private static final byte NAME_TLV_SUBTYPE = 1;
-    private static final short NAME_TLV_OFFSET = 32;
+    private static final short NAME_TLV_OFFSET = 34;
     private static final short NAME_TLV_HEADER = (short) ((NAME_TLV_TYPE << 9) | NAME_TLV_SIZE);
     // Contents of full name TLV
     private static final byte[] NAME_TLV = ByteBuffer.allocate(NAME_TLV_SIZE + 2)
@@ -85,7 +88,7 @@
     // Default switch, port number and TTL
     private static final byte[] DEFAULT_DPID = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00, 0x00 };
-    private static final short DEFAULT_PORT = 0;
+    private static final int DEFAULT_PORT = 0;
     private static final short DEFAULT_TTL = 120; // in seconds
 
     // Minimum and OVX-generated LLDP packet sizes
@@ -97,7 +100,7 @@
     // Field offsets in OVX-generated LLDP
     private static final short ETHERTYPE_OFFSET = 12;
     private static final short PORT_OFFSET = 26;
-    private static final short DPID_OFFSET = 54;
+    private static final short DPID_OFFSET = 56;
 
     // Private member fields
     // Byte arrays for TLV information string
@@ -119,7 +122,7 @@
     /**
      * Instantiates a new OVX LDDP message.
      */
-    public OVXLLDP() {
+    public ONLabLddp() {
         // Create TLVs
         this.chassisTLV = new LLDPTLV();
         this.portTLV = new LLDPTLV();
@@ -140,7 +143,7 @@
         this.setChassisTLV(DEFAULT_DPID);
         this.setPortTLV(DEFAULT_PORT);
         this.setTTLTLV(DEFAULT_TTL);
-        this.setOUIName(OVXLLDP.OVX_NAME);
+        this.setOUIName(ONLabLddp.OVX_NAME);
         this.setOUIDpid(DEFAULT_DPID);
     }
 
@@ -167,10 +170,10 @@
      *
      * @param portNumber the port number
      */
-    private void setPortTLV(final long portNumber) {
+    private void setPortTLV(final int portNumber) {
         this.bb = ByteBuffer.wrap(this.portId);
         this.bb.put(PORT_TLV_SUBTYPE);
-        this.bb.putLong(portNumber);
+        this.bb.putInt(portNumber);
 
         this.portTLV.setLength(PORT_TLV_SIZE);
         this.portTLV.setType(PORT_TLV_TYPE);
@@ -198,7 +201,7 @@
      */
     private void setOUIName(final String name) {
         this.bb = ByteBuffer.wrap(ouiName);
-        this.bb.put(OVXLLDP.ONLAB_OUI);
+        this.bb.put(ONLabLddp.ONLAB_OUI);
         this.bb.put(NAME_TLV_SUBTYPE);
         this.bb.put(name.getBytes());
 
@@ -214,7 +217,7 @@
      */
     private void setOUIDpid(final byte[] dpid) {
         this.bb = ByteBuffer.wrap(ouiDpid);
-        this.bb.put(OVXLLDP.ONLAB_OUI);
+        this.bb.put(ONLabLddp.ONLAB_OUI);
         this.bb.put(DPID_TLV_SUBTYPE);
         this.bb.put(dpid);
 
@@ -240,8 +243,8 @@
      *
      * @param port the port instance
      */
-    public void setPort(long port) {
-        long portNumber = port;
+    public void setPort(int port) {
+        int portNumber = port;
         this.setPortTLV(portNumber);
     }
 
@@ -272,9 +275,9 @@
         final byte[] dst = new byte[6];
         bb.get(dst);
 
-        if (!(Arrays.equals(dst, OVXLLDP.LLDP_NICIRA)
-                || Arrays.equals(dst, OVXLLDP.LLDP_MULTICAST) || Arrays.equals(
-                        dst, OVXLLDP.BDDP_MULTICAST))) {
+        if (!(Arrays.equals(dst, ONLabLddp.LLDP_NICIRA)
+                || Arrays.equals(dst, ONLabLddp.LLDP_MULTICAST) || Arrays.equals(
+                        dst, ONLabLddp.BDDP_MULTICAST))) {
 
             return false;
         }
@@ -335,7 +338,7 @@
      * @param packet
      * @return Dpid and port
      */
-    /*    public static long parseLLDP(final byte[] packet) {
+    public static DPIDandPort parseLLDP(final byte[] packet) {
         final ByteBuffer bb = ByteBuffer.wrap(packet);
 
         // Extra offset due to VLAN tag
@@ -345,10 +348,30 @@
             offset = 4;
         }
 
-        final short port = bb.getLong(PORT_OFFSET + offset);
+        final int port = bb.getInt(PORT_OFFSET + offset);
         final long dpid = bb.getLong(DPID_OFFSET + offset);
 
-        return dpid
+        return new DPIDandPort(dpid, port);
     }
-     */
+
+    public static class DPIDandPort {
+
+        private final long dpid;
+        private final int port;
+
+        public DPIDandPort(long dpid, int port) {
+            this.dpid = dpid;
+            this.port = port;
+        }
+
+        public long getDpid() {
+            return this.dpid;
+        }
+
+        public int getPort() {
+            return this.port;
+        }
+
+    }
+
 }
diff --git a/utils/misc/src/main/java/org/onlab/timer/Timer.java b/utils/misc/src/main/java/org/onlab/timer/Timer.java
new file mode 100644
index 0000000..1f821a7
--- /dev/null
+++ b/utils/misc/src/main/java/org/onlab/timer/Timer.java
@@ -0,0 +1,20 @@
+package org.onlab.timer;
+
+import org.jboss.netty.util.HashedWheelTimer;
+
+
+public final class Timer {
+
+    private Timer() {}
+
+    private static HashedWheelTimer timer;
+
+    public static HashedWheelTimer getTimer() {
+        if (Timer.timer == null) {
+            Timer.timer = new HashedWheelTimer();
+            Timer.timer.start();
+        }
+        return Timer.timer;
+    }
+
+}