diff --git a/web/gui/src/main/java/org/onlab/onos/gui/TopologyViewWebSocket.java b/web/gui/src/main/java/org/onlab/onos/gui/TopologyViewWebSocket.java
new file mode 100644
index 0000000..cc5756c
--- /dev/null
+++ b/web/gui/src/main/java/org/onlab/onos/gui/TopologyViewWebSocket.java
@@ -0,0 +1,514 @@
+/*
+ * 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.gui;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.eclipse.jetty.websocket.WebSocket;
+import org.onlab.onos.cluster.ClusterEvent;
+import org.onlab.onos.cluster.ClusterEventListener;
+import org.onlab.onos.cluster.ControllerNode;
+import org.onlab.onos.core.ApplicationId;
+import org.onlab.onos.core.CoreService;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.Device;
+import org.onlab.onos.net.Host;
+import org.onlab.onos.net.HostId;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.device.DeviceEvent;
+import org.onlab.onos.net.device.DeviceListener;
+import org.onlab.onos.net.flow.DefaultTrafficSelector;
+import org.onlab.onos.net.flow.DefaultTrafficTreatment;
+import org.onlab.onos.net.host.HostEvent;
+import org.onlab.onos.net.host.HostListener;
+import org.onlab.onos.net.intent.HostToHostIntent;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentEvent;
+import org.onlab.onos.net.intent.IntentListener;
+import org.onlab.onos.net.intent.MultiPointToSinglePointIntent;
+import org.onlab.onos.net.intent.OpticalConnectivityIntent;
+import org.onlab.onos.net.intent.PathIntent;
+import org.onlab.onos.net.intent.PointToPointIntent;
+import org.onlab.onos.net.link.LinkEvent;
+import org.onlab.onos.net.link.LinkListener;
+import org.onlab.osgi.ServiceDirectory;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.Timer;
+import java.util.TimerTask;
+
+import static com.google.common.base.Strings.isNullOrEmpty;
+import static org.onlab.onos.cluster.ClusterEvent.Type.INSTANCE_ADDED;
+import static org.onlab.onos.net.DeviceId.deviceId;
+import static org.onlab.onos.net.HostId.hostId;
+import static org.onlab.onos.net.device.DeviceEvent.Type.DEVICE_ADDED;
+import static org.onlab.onos.net.host.HostEvent.Type.HOST_ADDED;
+import static org.onlab.onos.net.intent.IntentState.INSTALLED;
+import static org.onlab.onos.net.link.LinkEvent.Type.LINK_ADDED;
+
+/**
+ * Web socket capable of interacting with the GUI topology view.
+ */
+public class TopologyViewWebSocket
+        extends TopologyViewMessages
+        implements WebSocket.OnTextMessage, WebSocket.OnControl {
+
+    private static final long MAX_AGE_MS = 15000;
+
+    private static final byte PING = 0x9;
+    private static final byte PONG = 0xA;
+    private static final byte[] PING_DATA = new byte[]{(byte) 0xde, (byte) 0xad};
+
+    private static final String APP_ID = "org.onlab.onos.gui";
+
+    private static final long TRAFFIC_FREQUENCY_SEC = 1000;
+
+    private final ApplicationId appId;
+
+    private Connection connection;
+    private FrameConnection control;
+
+    private final ClusterEventListener clusterListener = new InternalClusterListener();
+    private final DeviceListener deviceListener = new InternalDeviceListener();
+    private final LinkListener linkListener = new InternalLinkListener();
+    private final HostListener hostListener = new InternalHostListener();
+    private final IntentListener intentListener = new InternalIntentListener();
+
+    // Intents that are being monitored for the GUI
+    private ObjectNode monitorRequest;
+    private final Timer timer = new Timer("intent-traffic-monitor");
+    private final TimerTask timerTask = new IntentTrafficMonitor();
+
+    private long lastActive = System.currentTimeMillis();
+    private boolean listenersRemoved = false;
+
+    /**
+     * Creates a new web-socket for serving data to GUI topology view.
+     *
+     * @param directory service directory
+     */
+    public TopologyViewWebSocket(ServiceDirectory directory) {
+        super(directory);
+        appId = directory.get(CoreService.class).registerApplication(APP_ID);
+    }
+
+    /**
+     * Issues a close on the connection.
+     */
+    synchronized void close() {
+        removeListeners();
+        if (connection.isOpen()) {
+            connection.close();
+        }
+    }
+
+    /**
+     * Indicates if this connection is idle.
+     *
+     * @return true if idle or closed
+     */
+    synchronized boolean isIdle() {
+        boolean idle = (System.currentTimeMillis() - lastActive) > MAX_AGE_MS;
+        if (idle || !connection.isOpen()) {
+            return true;
+        }
+        try {
+            control.sendControl(PING, PING_DATA, 0, PING_DATA.length);
+        } catch (IOException e) {
+            log.warn("Unable to send ping message due to: ", e);
+        }
+        return false;
+    }
+
+    @Override
+    public void onOpen(Connection connection) {
+        log.info("GUI client connected");
+        this.connection = connection;
+        this.control = (FrameConnection) connection;
+        addListeners();
+        timer.schedule(timerTask, TRAFFIC_FREQUENCY_SEC, TRAFFIC_FREQUENCY_SEC);
+
+        sendAllInstances();
+        sendAllDevices();
+        sendAllLinks();
+        sendAllHosts();
+    }
+
+    @Override
+    public synchronized void onClose(int closeCode, String message) {
+        removeListeners();
+        timer.cancel();
+        log.info("GUI client disconnected");
+    }
+
+    @Override
+    public boolean onControl(byte controlCode, byte[] data, int offset, int length) {
+        lastActive = System.currentTimeMillis();
+        return true;
+    }
+
+    @Override
+    public void onMessage(String data) {
+        lastActive = System.currentTimeMillis();
+        try {
+            ObjectNode event = (ObjectNode) mapper.reader().readTree(data);
+            String type = string(event, "event", "unknown");
+            if (type.equals("requestDetails")) {
+                requestDetails(event);
+            } else if (type.equals("updateMeta")) {
+                updateMetaUi(event);
+            } else if (type.equals("addHostIntent")) {
+                createHostIntent(event);
+            } else if (type.equals("requestTraffic")) {
+                requestTraffic(event);
+            } else if (type.equals("cancelTraffic")) {
+                cancelTraffic(event);
+            }
+        } catch (Exception e) {
+            log.warn("Unable to parse GUI request {} due to {}", data, e);
+        }
+    }
+
+    // Sends the specified data to the client.
+    private synchronized void sendMessage(ObjectNode data) {
+        try {
+            if (connection.isOpen()) {
+                connection.sendMessage(data.toString());
+            }
+        } catch (IOException e) {
+            log.warn("Unable to send message {} to GUI due to {}", data, e);
+        }
+    }
+
+    // Sends all controller nodes to the client as node-added messages.
+    private void sendAllInstances() {
+        for (ControllerNode node : clusterService.getNodes()) {
+            sendMessage(instanceMessage(new ClusterEvent(INSTANCE_ADDED, node)));
+        }
+    }
+
+    // Sends all devices to the client as device-added messages.
+    private void sendAllDevices() {
+        for (Device device : deviceService.getDevices()) {
+            sendMessage(deviceMessage(new DeviceEvent(DEVICE_ADDED, device)));
+        }
+    }
+
+    // Sends all links to the client as link-added messages.
+    private void sendAllLinks() {
+        for (Link link : linkService.getLinks()) {
+            sendMessage(linkMessage(new LinkEvent(LINK_ADDED, link)));
+        }
+    }
+
+    // Sends all hosts to the client as host-added messages.
+    private void sendAllHosts() {
+        for (Host host : hostService.getHosts()) {
+            sendMessage(hostMessage(new HostEvent(HOST_ADDED, host)));
+        }
+    }
+
+    // Sends back device or host details.
+    private void requestDetails(ObjectNode event) {
+        ObjectNode payload = payload(event);
+        String type = string(payload, "class", "unknown");
+        long sid = number(event, "sid");
+
+        if (type.equals("device")) {
+            sendMessage(deviceDetails(deviceId(string(payload, "id")), sid));
+        } else if (type.equals("host")) {
+            sendMessage(hostDetails(hostId(string(payload, "id")), sid));
+        }
+    }
+
+    // Creates host-to-host intent.
+    private void createHostIntent(ObjectNode event) {
+        ObjectNode payload = payload(event);
+        long id = number(event, "sid");
+        // TODO: add protection against device ids and non-existent hosts.
+        HostId one = hostId(string(payload, "one"));
+        HostId two = hostId(string(payload, "two"));
+
+        HostToHostIntent hostIntent = new HostToHostIntent(appId, one, two,
+                                                           DefaultTrafficSelector.builder().build(),
+                                                           DefaultTrafficTreatment.builder().build());
+        monitorRequest = event;
+        intentService.submit(hostIntent);
+    }
+
+    // Sends traffic message.
+    private synchronized void requestTraffic(ObjectNode event) {
+        ObjectNode payload = payload(event);
+        long sid = number(event, "sid");
+        monitorRequest = event;
+
+        // Get the set of selected hosts and their intents.
+        Set<Host> hosts = getHosts((ArrayNode) payload.path("ids"));
+        Set<Intent> intents = findPathIntents(hosts);
+
+        // If there is a hover node, include it in the hosts and find intents.
+        String hover = string(payload, "hover");
+        Set<Intent> hoverIntents;
+        if (!isNullOrEmpty(hover)) {
+            addHost(hosts, hostId(hover));
+            hoverIntents = findPathIntents(hosts);
+            intents.removeAll(hoverIntents);
+
+            // Send an initial message to highlight all links of all monitored intents.
+            sendMessage(trafficMessage(sid,
+                                       new TrafficClass("primary", hoverIntents),
+                                       new TrafficClass("secondary", intents)));
+
+        } else {
+            // Send an initial message to highlight all links of all monitored intents.
+            sendMessage(trafficMessage(sid, new TrafficClass("primary", intents)));
+        }
+    }
+
+    // Cancels sending traffic messages.
+    private void cancelTraffic(ObjectNode event) {
+        sendMessage(trafficMessage(number(event, "sid")));
+        monitorRequest = null;
+    }
+
+    // Finds all path (host-to-host or point-to-point) intents that pertains
+    // to the given hosts.
+    private Set<Intent> findPathIntents(Set<Host> hosts) {
+        // Derive from this the set of edge connect points.
+        Set<ConnectPoint> edgePoints = getEdgePoints(hosts);
+
+        // Iterate over all intents and produce a set that contains only those
+        // intents that target all selected hosts or derived edge connect points.
+        return getIntents(hosts, edgePoints);
+    }
+
+    // Produces a set of intents that target all selected hosts or connect points.
+    private Set<Intent> getIntents(Set<Host> hosts, Set<ConnectPoint> edgePoints) {
+        Set<Intent> intents = new HashSet<>();
+        if (hosts.isEmpty()) {
+            return intents;
+        }
+
+        Set<OpticalConnectivityIntent> opticalIntents = new HashSet<>();
+
+        for (Intent intent : intentService.getIntents()) {
+            if (intentService.getIntentState(intent.id()) == INSTALLED) {
+                boolean isRelevant = false;
+                if (intent instanceof HostToHostIntent) {
+                    isRelevant = isIntentRelevant((HostToHostIntent) intent, hosts);
+                } else if (intent instanceof PointToPointIntent) {
+                    isRelevant = isIntentRelevant((PointToPointIntent) intent, edgePoints);
+                } else if (intent instanceof MultiPointToSinglePointIntent) {
+                    isRelevant = isIntentRelevant((MultiPointToSinglePointIntent) intent, edgePoints);
+                } else if (intent instanceof OpticalConnectivityIntent) {
+                    opticalIntents.add((OpticalConnectivityIntent) intent);
+                }
+                // TODO: add other intents, e.g. SinglePointToMultiPointIntent
+
+                if (isRelevant) {
+                    intents.add(intent);
+                }
+            }
+        }
+
+        for (OpticalConnectivityIntent intent : opticalIntents) {
+            if (isIntentRelevant(intent, intents)) {
+                intents.add(intent);
+            }
+        }
+        return intents;
+    }
+
+    // Indicates whether the specified intent involves all of the given hosts.
+    private boolean isIntentRelevant(HostToHostIntent intent, Set<Host> hosts) {
+        for (Host host : hosts) {
+            HostId id = host.id();
+            // Bail if intent does not involve this host.
+            if (!id.equals(intent.one()) && !id.equals(intent.two())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // Indicates whether the specified intent involves all of the given edge points.
+    private boolean isIntentRelevant(PointToPointIntent intent,
+                                     Set<ConnectPoint> edgePoints) {
+        for (ConnectPoint point : edgePoints) {
+            // Bail if intent does not involve this edge point.
+            if (!point.equals(intent.egressPoint()) &&
+                    !point.equals(intent.ingressPoint())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // Indicates whether the specified intent involves all of the given edge points.
+    private boolean isIntentRelevant(MultiPointToSinglePointIntent intent,
+                                     Set<ConnectPoint> edgePoints) {
+        for (ConnectPoint point : edgePoints) {
+            // Bail if intent does not involve this edge point.
+            if (!point.equals(intent.egressPoint()) &&
+                    !intent.ingressPoints().contains(point)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // Indicates whether the specified intent involves all of the given edge points.
+    private boolean isIntentRelevant(OpticalConnectivityIntent opticalIntent,
+                                     Set<Intent> intents) {
+        Link ccSrc = getFirstLink(opticalIntent.getSrcConnectPoint(), false);
+        Link ccDst = getFirstLink(opticalIntent.getDst(), true);
+
+        for (Intent intent : intents) {
+            List<Intent> installables = intentService.getInstallableIntents(intent.id());
+            for (Intent installable : installables) {
+                if (installable instanceof PathIntent) {
+                    List<Link> links = ((PathIntent) installable).path().links();
+                    if (links.size() == 3) {
+                        Link tunnel = links.get(1);
+                        if (tunnel.src().equals(ccSrc.src()) &&
+                                tunnel.dst().equals(ccDst.dst())) {
+                            return true;
+                        }
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    private Link getFirstLink(ConnectPoint point, boolean ingress) {
+        for (Link link : linkService.getLinks(point)) {
+            if (point.equals(ingress ? link.src() : link.dst())) {
+                return link;
+            }
+        }
+        return null;
+    }
+
+    // Produces a set of all host ids listed in the specified JSON array.
+    private Set<Host> getHosts(ArrayNode array) {
+        Set<Host> hosts = new HashSet<>();
+        if (array != null) {
+            for (JsonNode node : array) {
+                try {
+                    addHost(hosts, hostId(node.asText()));
+                } catch (IllegalArgumentException e) {
+                    log.debug("Skipping ID {}", node.asText());
+                }
+            }
+        }
+        return hosts;
+    }
+
+    private void addHost(Set<Host> hosts, HostId hostId) {
+        Host host = hostService.getHost(hostId);
+        if (host != null) {
+            hosts.add(host);
+        }
+    }
+
+    // Produces a set of edge points from the specified set of hosts.
+    private Set<ConnectPoint> getEdgePoints(Set<Host> hosts) {
+        Set<ConnectPoint> edgePoints = new HashSet<>();
+        for (Host host : hosts) {
+            edgePoints.add(host.location());
+        }
+        return edgePoints;
+    }
+
+
+    // Adds all internal listeners.
+    private void addListeners() {
+        clusterService.addListener(clusterListener);
+        deviceService.addListener(deviceListener);
+        linkService.addListener(linkListener);
+        hostService.addListener(hostListener);
+        intentService.addListener(intentListener);
+    }
+
+    // Removes all internal listeners.
+    private synchronized void removeListeners() {
+        if (!listenersRemoved) {
+            listenersRemoved = true;
+            clusterService.removeListener(clusterListener);
+            deviceService.removeListener(deviceListener);
+            linkService.removeListener(linkListener);
+            hostService.removeListener(hostListener);
+            intentService.removeListener(intentListener);
+        }
+    }
+
+    // Cluster event listener.
+    private class InternalClusterListener implements ClusterEventListener {
+        @Override
+        public void event(ClusterEvent event) {
+            sendMessage(instanceMessage(event));
+        }
+    }
+
+    // Device event listener.
+    private class InternalDeviceListener implements DeviceListener {
+        @Override
+        public void event(DeviceEvent event) {
+            sendMessage(deviceMessage(event));
+        }
+    }
+
+    // Link event listener.
+    private class InternalLinkListener implements LinkListener {
+        @Override
+        public void event(LinkEvent event) {
+            sendMessage(linkMessage(event));
+        }
+    }
+
+    // Host event listener.
+    private class InternalHostListener implements HostListener {
+        @Override
+        public void event(HostEvent event) {
+            sendMessage(hostMessage(event));
+        }
+    }
+
+    // Intent event listener.
+    private class InternalIntentListener implements IntentListener {
+        @Override
+        public void event(IntentEvent event) {
+            if (monitorRequest != null) {
+                requestTraffic(monitorRequest);
+            }
+        }
+    }
+
+    private class IntentTrafficMonitor extends TimerTask {
+        @Override
+        public void run() {
+            if (monitorRequest != null) {
+                requestTraffic(monitorRequest);
+            }
+        }
+    }
+}
+