diff --git a/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyClient.java b/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyClient.java
index 337d506..b2250e1 100644
--- a/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyClient.java
+++ b/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyClient.java
@@ -102,7 +102,7 @@
             // System.out.println("Got back:" + new String(response.get(2, TimeUnit.SECONDS)));
         }
 
-        sleep(1000);
+        //sleep(1000);
         log.info("measuring async sender");
         Timer sendAsyncTimer = metrics.createTimer(component, feature, "AsyncSender");
 
@@ -111,7 +111,7 @@
         messaging.sendAsync(endpoint, "simple", "Hello World".getBytes());
         context.stop();
         }
-        sleep(1000);
+        sleep(10000);
     }
 
     public static void stop() {
diff --git a/cli/src/main/java/org/onlab/onos/cli/MastersListCommand.java b/cli/src/main/java/org/onlab/onos/cli/MastersListCommand.java
index 2da76fd..0f7857f 100644
--- a/cli/src/main/java/org/onlab/onos/cli/MastersListCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/MastersListCommand.java
@@ -1,10 +1,11 @@
 package org.onlab.onos.cli;
 
 import com.google.common.collect.Lists;
+
 import org.apache.karaf.shell.commands.Command;
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.cluster.ControllerNode;
-import org.onlab.onos.cluster.MastershipService;
+import org.onlab.onos.mastership.MastershipService;
 import org.onlab.onos.net.DeviceId;
 
 import java.util.Collections;
diff --git a/cli/src/main/java/org/onlab/onos/cli/net/AddMultiPointToSinglePointIntentCommand.java b/cli/src/main/java/org/onlab/onos/cli/net/AddMultiPointToSinglePointIntentCommand.java
new file mode 100644
index 0000000..cdae8a6
--- /dev/null
+++ b/cli/src/main/java/org/onlab/onos/cli/net/AddMultiPointToSinglePointIntentCommand.java
@@ -0,0 +1,102 @@
+package org.onlab.onos.cli.net;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onlab.onos.cli.AbstractShellCommand;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.flow.DefaultTrafficSelector;
+import org.onlab.onos.net.flow.DefaultTrafficTreatment;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.IntentService;
+import org.onlab.onos.net.intent.MultiPointToSinglePointIntent;
+import org.onlab.packet.Ethernet;
+
+/**
+ * Installs point-to-point connectivity intents.
+ */
+@Command(scope = "onos", name = "add-multi-to-single-intent",
+         description = "Installs point-to-point connectivity intent")
+public class AddMultiPointToSinglePointIntentCommand extends AbstractShellCommand {
+
+    @Argument(index = 0, name = "ingressDevices",
+              description = "Ingress Device/Port Description",
+              required = true, multiValued = true)
+    String[] deviceStrings = null;
+
+    private static long id = 0x7070001;
+
+    @Override
+    protected void execute() {
+        IntentService service = get(IntentService.class);
+
+        if (deviceStrings.length < 2) {
+            return;
+        }
+
+        String egressDeviceString = deviceStrings[deviceStrings.length - 1];
+        DeviceId egressDeviceId = DeviceId.deviceId(getDeviceId(egressDeviceString));
+        PortNumber egressPortNumber =
+                PortNumber.portNumber(getPortNumber(egressDeviceString));
+        ConnectPoint egress = new ConnectPoint(egressDeviceId, egressPortNumber);
+        Set<ConnectPoint> ingressPoints = new HashSet<>();
+
+        for (int index = 0; index < deviceStrings.length - 1; index++) {
+            String ingressDeviceString = deviceStrings[index];
+            DeviceId ingressDeviceId = DeviceId.deviceId(getDeviceId(ingressDeviceString));
+            PortNumber ingressPortNumber =
+                    PortNumber.portNumber(getPortNumber(ingressDeviceString));
+            ConnectPoint ingress = new ConnectPoint(ingressDeviceId, ingressPortNumber);
+            ingressPoints.add(ingress);
+        }
+
+
+        TrafficSelector selector = DefaultTrafficSelector.builder()
+                .matchEthType(Ethernet.TYPE_IPV4)
+                .build();
+        TrafficTreatment treatment = DefaultTrafficTreatment.builder().build();
+
+        Intent intent =
+                new MultiPointToSinglePointIntent(new IntentId(id++),
+                                                  selector,
+                                                  treatment,
+                                                  ingressPoints,
+                                                  egress);
+        service.submit(intent);
+    }
+
+    /**
+     * Extracts the port number portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return port number as a string, empty string if the port is not found
+     */
+    private String getPortNumber(String deviceString) {
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return "";
+        }
+        return deviceString.substring(slash + 1, deviceString.length());
+    }
+
+    /**
+     * Extracts the device ID portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return device ID string
+     */
+    private String getDeviceId(String deviceString) {
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return "";
+        }
+        return deviceString.substring(0, slash);
+    }
+}
diff --git a/cli/src/main/java/org/onlab/onos/cli/net/DeviceRoleCommand.java b/cli/src/main/java/org/onlab/onos/cli/net/DeviceRoleCommand.java
index dfb8283..a5fdb3f 100644
--- a/cli/src/main/java/org/onlab/onos/cli/net/DeviceRoleCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/net/DeviceRoleCommand.java
@@ -3,8 +3,8 @@
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
 import org.onlab.onos.cli.AbstractShellCommand;
-import org.onlab.onos.cluster.MastershipAdminService;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipAdminService;
 import org.onlab.onos.net.MastershipRole;
 
 import static org.onlab.onos.net.DeviceId.deviceId;
diff --git a/cli/src/main/java/org/onlab/onos/cli/net/IntentPushTestCommand.java b/cli/src/main/java/org/onlab/onos/cli/net/IntentPushTestCommand.java
new file mode 100644
index 0000000..60181bd
--- /dev/null
+++ b/cli/src/main/java/org/onlab/onos/cli/net/IntentPushTestCommand.java
@@ -0,0 +1,145 @@
+package org.onlab.onos.cli.net;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onlab.onos.cli.AbstractShellCommand;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.flow.DefaultTrafficSelector;
+import org.onlab.onos.net.flow.DefaultTrafficTreatment;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentEvent;
+import org.onlab.onos.net.intent.IntentEvent.Type;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.IntentListener;
+import org.onlab.onos.net.intent.IntentService;
+import org.onlab.onos.net.intent.PointToPointIntent;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.MacAddress;
+
+/**
+ * Installs point-to-point connectivity intents.
+ */
+@Command(scope = "onos", name = "push-test-intents",
+         description = "Installs random intents to test throughput")
+public class IntentPushTestCommand extends AbstractShellCommand
+    implements IntentListener {
+
+    @Argument(index = 0, name = "ingressDevice",
+              description = "Ingress Device/Port Description",
+              required = true, multiValued = false)
+    String ingressDeviceString = null;
+
+    @Argument(index = 1, name = "egressDevice",
+              description = "Egress Device/Port Description",
+              required = true, multiValued = false)
+    String egressDeviceString = null;
+
+    @Argument(index = 2, name = "count",
+            description = "Number of intents to push",
+            required = true, multiValued = false)
+    String countString = null;
+
+
+    private static long id = 0x7870001;
+
+    private IntentService service;
+    private CountDownLatch latch;
+    private long start, end;
+
+    @Override
+    protected void execute() {
+        service = get(IntentService.class);
+
+        DeviceId ingressDeviceId = DeviceId.deviceId(getDeviceId(ingressDeviceString));
+        PortNumber ingressPortNumber =
+                PortNumber.portNumber(getPortNumber(ingressDeviceString));
+        ConnectPoint ingress = new ConnectPoint(ingressDeviceId, ingressPortNumber);
+
+        DeviceId egressDeviceId = DeviceId.deviceId(getDeviceId(egressDeviceString));
+        PortNumber egressPortNumber =
+                PortNumber.portNumber(getPortNumber(egressDeviceString));
+        ConnectPoint egress = new ConnectPoint(egressDeviceId, egressPortNumber);
+
+        TrafficSelector.Builder selector = DefaultTrafficSelector.builder()
+                .matchEthType(Ethernet.TYPE_IPV4);
+        TrafficTreatment treatment = DefaultTrafficTreatment.builder().build();
+
+        int count = Integer.parseInt(countString);
+
+        service.addListener(this);
+        latch = new CountDownLatch(count);
+
+        start = System.currentTimeMillis();
+        for (int i = 0; i < count; i++) {
+            TrafficSelector s = selector
+                                .matchEthSrc(MacAddress.valueOf(i))
+                                .build();
+            Intent intent =
+                    new PointToPointIntent(new IntentId(id++),
+                                                     s,
+                                                     treatment,
+                                                     ingress,
+                                                     egress);
+            service.submit(intent);
+        }
+        try {
+            latch.await(5, TimeUnit.SECONDS);
+            printResults(count);
+        } catch (InterruptedException e) {
+            print(e.toString());
+        }
+        service.removeListener(this);
+    }
+
+    private void printResults(int count) {
+        long delta = end - start;
+        print("Time to install %d intents: %d ms", count, delta);
+    }
+
+    /**
+     * Extracts the port number portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return port number as a string, empty string if the port is not found
+     */
+    private String getPortNumber(String deviceString) {
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return "";
+        }
+        return deviceString.substring(slash + 1, deviceString.length());
+    }
+
+    /**
+     * Extracts the device ID portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return device ID string
+     */
+    private String getDeviceId(String deviceString) {
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return "";
+        }
+        return deviceString.substring(0, slash);
+    }
+
+    @Override
+    public void event(IntentEvent event) {
+        if (event.type() == Type.INSTALLED) {
+            end = event.time();
+            if (latch != null) {
+                latch.countDown();
+            } else {
+                log.warn("install event latch is null");
+            }
+        }
+    }
+}
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 6120d30..f6fa0ff 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -82,6 +82,19 @@
                 <ref component-id="connectPointCompleter"/>
             </completers>
         </command>
+        <command>
+            <action class="org.onlab.onos.cli.net.AddMultiPointToSinglePointIntentCommand"/>
+            <completers>
+                <ref component-id="connectPointCompleter"/>
+            </completers>
+        </command>
+        <command>
+            <action class="org.onlab.onos.cli.net.IntentPushTestCommand"/>
+            <completers>
+                <ref component-id="connectPointCompleter"/>
+                <ref component-id="connectPointCompleter"/>
+            </completers>
+        </command>
 
         <command>
             <action class="org.onlab.onos.cli.net.ClustersListCommand"/>
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipAdminService.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipAdminService.java
similarity index 87%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipAdminService.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipAdminService.java
index 907b3f8..e558dd4 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipAdminService.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipAdminService.java
@@ -1,5 +1,6 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
+import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipEvent.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
similarity index 95%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipEvent.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
index 15811fb..bd7462d 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipEvent.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
@@ -1,5 +1,6 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
+import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.event.AbstractEvent;
 import org.onlab.onos.net.DeviceId;
 
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipListener.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipListener.java
similarity index 84%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipListener.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipListener.java
index 71d65be..e4295e0 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipListener.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipListener.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import org.onlab.onos.event.EventListener;
 
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipService.java
similarity index 96%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipService.java
index 51b6f6a..029e357 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipService.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipService.java
@@ -1,7 +1,8 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import java.util.Set;
 
+import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipStore.java
similarity index 97%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipStore.java
index dc5603f..0117d0d 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipStore.java
@@ -1,7 +1,8 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import java.util.Set;
 
+import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.onlab.onos.store.Store;
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipStoreDelegate.java
similarity index 83%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipStoreDelegate.java
index b4d923c..2537630 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipStoreDelegate.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import org.onlab.onos.store.StoreDelegate;
 
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipTerm.java
similarity index 93%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipTerm.java
index 71d08f2..640180d 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipTerm.java
@@ -1,7 +1,9 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import java.util.Objects;
 
+import org.onlab.onos.cluster.NodeId;
+
 public final class MastershipTerm {
 
     private final NodeId master;
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTermService.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipTermService.java
similarity index 93%
rename from core/api/src/main/java/org/onlab/onos/cluster/MastershipTermService.java
rename to core/api/src/main/java/org/onlab/onos/mastership/MastershipTermService.java
index b03ed81..567962e 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTermService.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipTermService.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import org.onlab.onos.net.DeviceId;
 
diff --git a/core/api/src/main/java/org/onlab/onos/mastership/package-info.java b/core/api/src/main/java/org/onlab/onos/mastership/package-info.java
new file mode 100644
index 0000000..36f7271
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/mastership/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Set of abstractions for dealing with controller mastership related topics.
+ */
+package org.onlab.onos.mastership;
diff --git a/core/api/src/main/java/org/onlab/onos/store/ClockProviderService.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceClockProviderService.java
similarity index 69%
rename from core/api/src/main/java/org/onlab/onos/store/ClockProviderService.java
rename to core/api/src/main/java/org/onlab/onos/net/device/DeviceClockProviderService.java
index a5f81c7..1fb4899 100644
--- a/core/api/src/main/java/org/onlab/onos/store/ClockProviderService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceClockProviderService.java
@@ -1,14 +1,13 @@
-package org.onlab.onos.store;
+package org.onlab.onos.net.device;
 
-import org.onlab.onos.cluster.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
 
-//TODO: Consider renaming to DeviceClockProviderService?
 /**
 * Interface for feeding term information to a logical clock service
 * that vends per device timestamps.
 */
-public interface ClockProviderService {
+public interface DeviceClockProviderService {
 
     /**
      * Updates the mastership term for the specified deviceId.
diff --git a/core/api/src/main/java/org/onlab/onos/store/ClockService.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceClockService.java
similarity index 76%
rename from core/api/src/main/java/org/onlab/onos/store/ClockService.java
rename to core/api/src/main/java/org/onlab/onos/net/device/DeviceClockService.java
index 20549e8..ccdfeb0 100644
--- a/core/api/src/main/java/org/onlab/onos/store/ClockService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceClockService.java
@@ -1,12 +1,13 @@
-package org.onlab.onos.store;
+package org.onlab.onos.net.device;
 
 import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.store.Timestamp;
 
 // TODO: Consider renaming to DeviceClockService?
 /**
  * Interface for a logical clock service that vends per device timestamps.
  */
-public interface ClockService {
+public interface DeviceClockService {
 
     /**
      * Returns a new timestamp for the specified deviceId.
diff --git a/core/api/src/main/java/org/onlab/onos/net/intent/LinkCollectionIntent.java b/core/api/src/main/java/org/onlab/onos/net/intent/LinkCollectionIntent.java
new file mode 100644
index 0000000..78c95cf
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/intent/LinkCollectionIntent.java
@@ -0,0 +1,84 @@
+package org.onlab.onos.net.intent;
+
+import java.util.Collection;
+import java.util.Objects;
+import java.util.Set;
+
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Abstraction of a connectivity intent that is implemented by a set of path
+ * segments.
+ */
+public class LinkCollectionIntent extends ConnectivityIntent implements InstallableIntent {
+
+    private final Set<Link> links;
+
+    /**
+     * Creates a new point-to-point intent with the supplied ingress/egress
+     * ports and using the specified explicit path.
+     *
+     * @param id          intent identifier
+     * @param selector    traffic match
+     * @param treatment   action
+     * @param links       traversed links
+     * @throws NullPointerException {@code path} is null
+     */
+    public LinkCollectionIntent(IntentId id,
+                                TrafficSelector selector,
+                                TrafficTreatment treatment,
+                                Set<Link> links) {
+        super(id, selector, treatment);
+        this.links = links;
+    }
+
+    protected LinkCollectionIntent() {
+        super();
+        this.links = null;
+    }
+
+    @Override
+    public Collection<Link> requiredLinks() {
+        return links;
+    }
+
+    public Set<Link> links() {
+        return links;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        if (!super.equals(o)) {
+            return false;
+        }
+
+        LinkCollectionIntent that = (LinkCollectionIntent) o;
+
+        return Objects.equals(this.links, that.links);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), links);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("id", id())
+                .add("match", selector())
+                .add("action", treatment())
+                .add("links", links())
+                .toString();
+    }
+}
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
similarity index 97%
rename from core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
rename to core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
index a95283d..8b966ed 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
+++ b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
@@ -5,6 +5,7 @@
 
 import org.onlab.onos.cluster.NodeId;
 
+// TODO: remove IOExceptions?
 /**
  * Service for assisting communications between controller cluster nodes.
  */
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
similarity index 100%
rename from core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
rename to core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java
similarity index 100%
rename from core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java
rename to core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubject.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubject.java
similarity index 100%
rename from core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubject.java
rename to core/api/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubject.java
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/package-info.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/package-info.java
similarity index 100%
rename from core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/package-info.java
rename to core/api/src/main/java/org/onlab/onos/store/cluster/messaging/package-info.java
diff --git a/core/api/src/test/java/org/onlab/onos/cluster/MastershipServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/mastership/MastershipServiceAdapter.java
similarity index 92%
rename from core/api/src/test/java/org/onlab/onos/cluster/MastershipServiceAdapter.java
rename to core/api/src/test/java/org/onlab/onos/mastership/MastershipServiceAdapter.java
index 2e92f5b..97b57e5 100644
--- a/core/api/src/test/java/org/onlab/onos/cluster/MastershipServiceAdapter.java
+++ b/core/api/src/test/java/org/onlab/onos/mastership/MastershipServiceAdapter.java
@@ -1,5 +1,6 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
+import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 
diff --git a/core/api/src/test/java/org/onlab/onos/cluster/MastershipTermTest.java b/core/api/src/test/java/org/onlab/onos/mastership/MastershipTermTest.java
similarity index 92%
rename from core/api/src/test/java/org/onlab/onos/cluster/MastershipTermTest.java
rename to core/api/src/test/java/org/onlab/onos/mastership/MastershipTermTest.java
index 139c695..9b2a4e6 100644
--- a/core/api/src/test/java/org/onlab/onos/cluster/MastershipTermTest.java
+++ b/core/api/src/test/java/org/onlab/onos/mastership/MastershipTermTest.java
@@ -1,8 +1,9 @@
-package org.onlab.onos.cluster;
+package org.onlab.onos.mastership;
 
 import static org.junit.Assert.assertEquals;
 
 import org.junit.Test;
+import org.onlab.onos.cluster.NodeId;
 
 import com.google.common.testing.EqualsTester;
 
diff --git a/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java b/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
index 125745b..59614da 100644
--- a/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
+++ b/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
@@ -4,6 +4,7 @@
 import static org.slf4j.LoggerFactory.getLogger;
 
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
@@ -14,17 +15,18 @@
 import org.onlab.onos.cluster.ClusterEvent;
 import org.onlab.onos.cluster.ClusterEventListener;
 import org.onlab.onos.cluster.ClusterService;
-import org.onlab.onos.cluster.MastershipAdminService;
-import org.onlab.onos.cluster.MastershipEvent;
-import org.onlab.onos.cluster.MastershipListener;
-import org.onlab.onos.cluster.MastershipService;
-import org.onlab.onos.cluster.MastershipStore;
-import org.onlab.onos.cluster.MastershipStoreDelegate;
-import org.onlab.onos.cluster.MastershipTerm;
-import org.onlab.onos.cluster.MastershipTermService;
+import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.event.AbstractListenerRegistry;
 import org.onlab.onos.event.EventDeliveryService;
+import org.onlab.onos.mastership.MastershipAdminService;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipListener;
+import org.onlab.onos.mastership.MastershipService;
+import org.onlab.onos.mastership.MastershipStore;
+import org.onlab.onos.mastership.MastershipStoreDelegate;
+import org.onlab.onos.mastership.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTermService;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.slf4j.Logger;
@@ -164,21 +166,68 @@
     //callback for reacting to cluster events
     private class InternalClusterEventListener implements ClusterEventListener {
 
+        // A notion of a local maximum cluster size, used to tie-break.
+        // Think of a better way to do this.
+        private AtomicInteger clusterSize;
+
+        InternalClusterEventListener() {
+            clusterSize = new AtomicInteger(0);
+        }
+
         @Override
         public void event(ClusterEvent event) {
             switch (event.type()) {
                 //FIXME: worry about addition when the time comes
                 case INSTANCE_ADDED:
                 case INSTANCE_ACTIVATED:
-                     break;
+                    clusterSize.incrementAndGet();
+                    log.info("instance {} added/activated", event.subject());
+                    break;
                 case INSTANCE_REMOVED:
                 case INSTANCE_DEACTIVATED:
+                    ControllerNode node = event.subject();
+
+                    if (node.equals(clusterService.getLocalNode())) {
+                        //If we are in smaller cluster, relinquish and return
+                        for (DeviceId device : getDevicesOf(node.id())) {
+                            if (!isInMajority()) {
+                                //own DeviceManager should catch event and tell switch
+                                store.relinquishRole(node.id(), device);
+                            }
+                        }
+                        log.info("broke off from cluster, relinquished devices");
+                        break;
+                    }
+
+                    // if we are the larger one and the removed node(s) are brain dead,
+                    // force relinquish on behalf of disabled node.
+                    // check network channel to do this?
+                    for (DeviceId device : getDevicesOf(node.id())) {
+                        //some things to check:
+                        // 1. we didn't break off as well while we're at it
+                        // 2. others don't pile in and try too - maybe a lock
+                        if (isInMajority()) {
+                            store.relinquishRole(node.id(), device);
+                        }
+                    }
+                    clusterSize.decrementAndGet();
+                    log.info("instance {} removed/deactivated", event.subject());
                     break;
                 default:
                     log.warn("unknown cluster event {}", event);
             }
         }
 
+        private boolean isInMajority() {
+            if (clusterService.getNodes().size() > (clusterSize.intValue() / 2)) {
+                return true;
+            }
+            //else {
+                //FIXME: break tie for equal-sized clusters, can we use hz's functions?
+            // }
+            return false;
+        }
+
     }
 
     public class InternalDelegate implements MastershipStoreDelegate {
diff --git a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
index 8cde5a3..28bdac1 100644
--- a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
@@ -13,20 +13,22 @@
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.onos.cluster.ClusterService;
-import org.onlab.onos.cluster.MastershipEvent;
-import org.onlab.onos.cluster.MastershipListener;
-import org.onlab.onos.cluster.MastershipService;
-import org.onlab.onos.cluster.MastershipTermService;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.event.AbstractListenerRegistry;
 import org.onlab.onos.event.EventDeliveryService;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipListener;
+import org.onlab.onos.mastership.MastershipService;
+import org.onlab.onos.mastership.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTermService;
 import org.onlab.onos.net.Device;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.onlab.onos.net.Port;
 import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.device.DefaultDeviceDescription;
 import org.onlab.onos.net.device.DeviceAdminService;
+import org.onlab.onos.net.device.DeviceClockProviderService;
 import org.onlab.onos.net.device.DeviceDescription;
 import org.onlab.onos.net.device.DeviceEvent;
 import org.onlab.onos.net.device.DeviceListener;
@@ -39,7 +41,6 @@
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.net.provider.AbstractProviderRegistry;
 import org.onlab.onos.net.provider.AbstractProviderService;
-import org.onlab.onos.store.ClockProviderService;
 import org.slf4j.Logger;
 
 /**
@@ -81,7 +82,7 @@
     protected MastershipTermService termService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected ClockProviderService clockProviderService;
+    protected DeviceClockProviderService deviceClockProviderService;
 
     @Activate
     public void activate() {
@@ -216,7 +217,7 @@
                 return;
             }
             // tell clock provider if this instance is the master
-            clockProviderService.setMastershipTerm(deviceId, term);
+            deviceClockProviderService.setMastershipTerm(deviceId, term);
 
             DeviceEvent event = store.createOrUpdateDevice(provider().id(),
                     deviceId, deviceDescription);
@@ -257,12 +258,12 @@
             // temporarily request for Master Role and mark offline.
             if (!mastershipService.getLocalRole(deviceId).equals(MastershipRole.MASTER)) {
                 log.debug("Device {} disconnected, but I am not the master", deviceId);
-                //let go of any role anyways
+                //let go of ability to be backup
                 mastershipService.relinquishMastership(deviceId);
                 return;
             }
             DeviceEvent event = store.markOffline(deviceId);
-            //we're no longer capable of being master or a candidate.
+            //relinquish master role and ability to be backup.
             mastershipService.relinquishMastership(deviceId);
 
             if (event != null) {
@@ -325,23 +326,31 @@
         @Override
         public void event(MastershipEvent event) {
             final DeviceId did = event.subject();
-            if (isAvailable(did)) {
-                final NodeId myNodeId = clusterService.getLocalNode().id();
+            final NodeId myNodeId = clusterService.getLocalNode().id();
 
-                if (myNodeId.equals(event.master())) {
-                    MastershipTerm term = termService.getMastershipTerm(did);
+            if (myNodeId.equals(event.master())) {
+                MastershipTerm term = termService.getMastershipTerm(did);
 
-                    if (term.master().equals(myNodeId)) {
-                        // only set the new term if I am the master
-                        clockProviderService.setMastershipTerm(did, term);
-                    }
-                    applyRole(did, MastershipRole.MASTER);
-                } else {
-                    applyRole(did, MastershipRole.STANDBY);
+                if (term.master().equals(myNodeId)) {
+                    // only set the new term if I am the master
+                    deviceClockProviderService.setMastershipTerm(did, term);
                 }
+
+                // FIXME: we should check that the device is connected on our end.
+                // currently, this is not straight forward as the actual switch
+                // implementation is hidden from the registry.
+                if (!isAvailable(did)) {
+                    //flag the device as online. Is there a better way to do this?
+                    Device device = getDevice(did);
+                    store.createOrUpdateDevice(device.providerId(), did,
+                            new DefaultDeviceDescription(
+                                    did.uri(), device.type(), device.manufacturer(),
+                                    device.hwVersion(), device.swVersion(),
+                                    device.serialNumber()));
+                }
+
+                applyRole(did, MastershipRole.MASTER);
             } else {
-                //device dead to node, give up
-                mastershipService.relinquishMastership(did);
                 applyRole(did, MastershipRole.STANDBY);
             }
         }
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/LinkCollectionIntentInstaller.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/LinkCollectionIntentInstaller.java
new file mode 100644
index 0000000..51e0d2e
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/LinkCollectionIntentInstaller.java
@@ -0,0 +1,110 @@
+package org.onlab.onos.net.intent.impl;
+
+import java.util.List;
+import java.util.concurrent.Future;
+
+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.ApplicationId;
+import org.onlab.onos.CoreService;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.flow.CompletedBatchOperation;
+import org.onlab.onos.net.flow.DefaultFlowRule;
+import org.onlab.onos.net.flow.DefaultTrafficSelector;
+import org.onlab.onos.net.flow.FlowRule;
+import org.onlab.onos.net.flow.FlowRuleBatchEntry;
+import org.onlab.onos.net.flow.FlowRuleBatchEntry.FlowRuleOperation;
+import org.onlab.onos.net.flow.FlowRuleBatchOperation;
+import org.onlab.onos.net.flow.FlowRuleService;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.intent.IntentExtensionService;
+import org.onlab.onos.net.intent.IntentInstaller;
+import org.onlab.onos.net.intent.LinkCollectionIntent;
+import org.onlab.onos.net.intent.PathIntent;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Lists;
+
+import static org.onlab.onos.net.flow.DefaultTrafficTreatment.builder;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Installer for {@link org.onlab.onos.net.intent.LinkCollectionIntent}
+ * path segment intents.
+ */
+@Component(immediate = true)
+public class LinkCollectionIntentInstaller implements IntentInstaller<LinkCollectionIntent> {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected IntentExtensionService intentManager;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowRuleService flowRuleService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    private ApplicationId appId;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication("org.onlab.onos.net.intent");
+        intentManager.registerInstaller(LinkCollectionIntent.class, this);
+    }
+
+    @Deactivate
+    public void deactivate() {
+        intentManager.unregisterInstaller(PathIntent.class);
+    }
+
+    /**
+     * Apply a list of FlowRules.
+     *
+     * @param rules rules to apply
+     */
+    private Future<CompletedBatchOperation> applyBatch(List<FlowRuleBatchEntry> rules) {
+        FlowRuleBatchOperation batch = new FlowRuleBatchOperation(rules);
+        return flowRuleService.applyBatch(batch);
+    }
+
+    @Override
+    public Future<CompletedBatchOperation> install(LinkCollectionIntent intent) {
+        TrafficSelector.Builder builder =
+                DefaultTrafficSelector.builder(intent.selector());
+        List<FlowRuleBatchEntry> rules = Lists.newLinkedList();
+        for (Link link : intent.links()) {
+            TrafficTreatment treatment = builder()
+                    .setOutput(link.src().port()).build();
+
+            FlowRule rule = new DefaultFlowRule(link.src().deviceId(),
+                    builder.build(), treatment,
+                    123, appId, 600);
+            rules.add(new FlowRuleBatchEntry(FlowRuleOperation.ADD, rule));
+        }
+
+        return applyBatch(rules);
+    }
+
+    @Override
+    public Future<CompletedBatchOperation> uninstall(LinkCollectionIntent intent) {
+        TrafficSelector.Builder builder =
+                DefaultTrafficSelector.builder(intent.selector());
+        List<FlowRuleBatchEntry> rules = Lists.newLinkedList();
+
+        for (Link link : intent.links()) {
+            TrafficTreatment treatment = builder()
+                    .setOutput(link.src().port()).build();
+            FlowRule rule = new DefaultFlowRule(link.src().deviceId(),
+                    builder.build(), treatment,
+                    123, appId, 600);
+            rules.add(new FlowRuleBatchEntry(FlowRuleOperation.REMOVE, rule));
+        }
+        return applyBatch(rules);
+    }
+}
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java
new file mode 100644
index 0000000..68c55dd
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java
@@ -0,0 +1,85 @@
+package org.onlab.onos.net.intent.impl;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+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;
+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.Link;
+import org.onlab.onos.net.Path;
+import org.onlab.onos.net.intent.IdGenerator;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentCompiler;
+import org.onlab.onos.net.intent.IntentExtensionService;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.LinkCollectionIntent;
+import org.onlab.onos.net.intent.MultiPointToSinglePointIntent;
+import org.onlab.onos.net.intent.PointToPointIntent;
+import org.onlab.onos.net.topology.PathService;
+
+/**
+ * An intent compiler for
+ * {@link org.onlab.onos.net.intent.MultiPointToSinglePointIntent}.
+ */
+@Component(immediate = true)
+public class MultiPointToSinglePointIntentCompiler
+        implements IntentCompiler<MultiPointToSinglePointIntent> {
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected IntentExtensionService intentManager;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected PathService pathService;
+
+    private IdGenerator<IntentId> intentIdGenerator;
+
+    @Activate
+    public void activate() {
+        IdBlockAllocator idBlockAllocator = new DummyIdBlockAllocator();
+        intentIdGenerator = new IdBlockAllocatorBasedIntentIdGenerator(idBlockAllocator);
+        intentManager.registerCompiler(MultiPointToSinglePointIntent.class, this);
+    }
+
+    @Deactivate
+    public void deactivate() {
+        intentManager.unregisterCompiler(PointToPointIntent.class);
+    }
+
+    @Override
+    public List<Intent> compile(MultiPointToSinglePointIntent intent) {
+        Set<Link> links = new HashSet<>();
+
+        for (ConnectPoint ingressPoint : intent.ingressPoints()) {
+            Path path = getPath(ingressPoint, intent.egressPoint());
+            links.addAll(path.links());
+        }
+
+        Intent result = new LinkCollectionIntent(intentIdGenerator.getNewId(),
+                intent.selector(), intent.treatment(),
+                links);
+        return Arrays.asList(result);
+    }
+
+    /**
+     * Computes a path between two ConnectPoints.
+     *
+     * @param one start of the path
+     * @param two end of the path
+     * @return Path between the two
+     * @throws org.onlab.onos.net.intent.impl.PathNotFoundException if a path cannot be found
+     */
+    private Path getPath(ConnectPoint one, ConnectPoint two) {
+        Set<Path> paths = pathService.getPaths(one.deviceId(), two.deviceId());
+        if (paths.isEmpty()) {
+            throw new PathNotFoundException("No path from " + one + " to " + two);
+        }
+        // TODO: let's be more intelligent about this eventually
+        return paths.iterator().next();
+    }
+}
diff --git a/core/net/src/test/java/org/onlab/onos/cluster/impl/MastershipManagerTest.java b/core/net/src/test/java/org/onlab/onos/cluster/impl/MastershipManagerTest.java
index 29b4ddf..c5c152c 100644
--- a/core/net/src/test/java/org/onlab/onos/cluster/impl/MastershipManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/cluster/impl/MastershipManagerTest.java
@@ -10,14 +10,16 @@
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.ControllerNode.State;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipService;
-import org.onlab.onos.cluster.MastershipTermService;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.event.impl.TestEventDispatcher;
+import org.onlab.onos.mastership.MastershipService;
+import org.onlab.onos.mastership.MastershipTermService;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.store.trivial.impl.SimpleMastershipStore;
 import org.onlab.packet.IpPrefix;
 
+import com.google.common.collect.Sets;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.onlab.onos.net.MastershipRole.*;
@@ -143,7 +145,7 @@
 
         @Override
         public Set<ControllerNode> getNodes() {
-            return null;
+            return Sets.newHashSet();
         }
 
         @Override
diff --git a/core/net/src/test/java/org/onlab/onos/net/device/impl/DeviceManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/device/impl/DeviceManagerTest.java
index e833b4a..0b017cf 100644
--- a/core/net/src/test/java/org/onlab/onos/net/device/impl/DeviceManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/device/impl/DeviceManagerTest.java
@@ -10,13 +10,13 @@
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipServiceAdapter;
-import org.onlab.onos.cluster.MastershipTerm;
-import org.onlab.onos.cluster.MastershipTermService;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.cluster.ControllerNode.State;
 import org.onlab.onos.event.Event;
 import org.onlab.onos.event.impl.TestEventDispatcher;
+import org.onlab.onos.mastership.MastershipServiceAdapter;
+import org.onlab.onos.mastership.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTermService;
 import org.onlab.onos.net.Device;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
@@ -25,6 +25,7 @@
 import org.onlab.onos.net.device.DefaultDeviceDescription;
 import org.onlab.onos.net.device.DefaultPortDescription;
 import org.onlab.onos.net.device.DeviceAdminService;
+import org.onlab.onos.net.device.DeviceClockProviderService;
 import org.onlab.onos.net.device.DeviceDescription;
 import org.onlab.onos.net.device.DeviceEvent;
 import org.onlab.onos.net.device.DeviceListener;
@@ -35,7 +36,6 @@
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
-import org.onlab.onos.store.ClockProviderService;
 import org.onlab.onos.store.trivial.impl.SimpleDeviceStore;
 import org.onlab.packet.IpPrefix;
 
@@ -88,7 +88,7 @@
         mgr.eventDispatcher = new TestEventDispatcher();
         mgr.mastershipService = new TestMastershipService();
         mgr.clusterService = new TestClusterService();
-        mgr.clockProviderService = new TestClockProviderService();
+        mgr.deviceClockProviderService = new TestClockProviderService();
         mgr.activate();
 
         service.addListener(listener);
@@ -336,7 +336,7 @@
     }
 
     private final class TestClockProviderService implements
-            ClockProviderService {
+            DeviceClockProviderService {
 
         @Override
         public void setMastershipTerm(DeviceId deviceId, MastershipTerm term) {
diff --git a/core/net/src/test/java/org/onlab/onos/net/intent/TestLinkCollectionIntent.java b/core/net/src/test/java/org/onlab/onos/net/intent/TestLinkCollectionIntent.java
new file mode 100644
index 0000000..ba67a6a
--- /dev/null
+++ b/core/net/src/test/java/org/onlab/onos/net/intent/TestLinkCollectionIntent.java
@@ -0,0 +1,47 @@
+package org.onlab.onos.net.intent;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.junit.Test;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.flow.TrafficSelector;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.flow.criteria.Criterion;
+import org.onlab.onos.net.flow.instructions.Instruction;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class TestLinkCollectionIntent {
+
+    private static class MockSelector implements TrafficSelector {
+        @Override
+        public Set<Criterion> criteria() {
+            return new HashSet<Criterion>();
+        }
+    }
+
+    private static class MockTreatment implements TrafficTreatment {
+        @Override
+        public List<Instruction> instructions() {
+            return new ArrayList<>();
+        }
+    }
+
+    @Test
+    public void testComparison() {
+        TrafficSelector selector = new MockSelector();
+        TrafficTreatment treatment = new MockTreatment();
+        Set<Link> links = new HashSet<>();
+        LinkCollectionIntent i1 = new LinkCollectionIntent(new IntentId(12),
+                selector, treatment, links);
+        LinkCollectionIntent i2 = new LinkCollectionIntent(new IntentId(12),
+                selector, treatment, links);
+
+        assertThat(i1.equals(i2), is(true));
+    }
+
+}
diff --git a/core/store/dist/pom.xml b/core/store/dist/pom.xml
index 7b00833..33517c7 100644
--- a/core/store/dist/pom.xml
+++ b/core/store/dist/pom.xml
@@ -62,6 +62,11 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
         </dependency>
+        <dependency>
+          <groupId>org.easymock</groupId>
+          <artifactId>easymock</artifactId>
+          <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/SerializationService.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/SerializationService.java
index 4d76ce3..3082718 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/SerializationService.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/SerializationService.java
@@ -1,5 +1,6 @@
 package org.onlab.onos.store.cluster.messaging;
 
+// FIXME: not used any more? remove
 /**
  * Service for encoding &amp; decoding intra-cluster message payload.
  */
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java
index bf47f49..07a97bc 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/MessageSerializer.java
@@ -11,6 +11,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+//FIXME: not used any more? remove
 /**
  * Factory for parsing messages sent between cluster members.
  */
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/package-info.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/package-info.java
index 6c1e71b..3364dd2 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/package-info.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/package-info.java
@@ -1,4 +1,4 @@
 /**
  * Implementation of the cluster messaging mechanism.
  */
-package org.onlab.onos.store.cluster.messaging.impl;
\ No newline at end of file
+package org.onlab.onos.store.cluster.messaging.impl;
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/Timestamped.java b/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/Timestamped.java
index e803e74..8d2aee1 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/Timestamped.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/Timestamped.java
@@ -10,7 +10,8 @@
 
 /**
  * Wrapper class to store Timestamped value.
- * @param <T>
+ *
+ * @param <T> Timestamped value type
  */
 public final class Timestamped<T> {
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyAdvertisement.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyAdvertisement.java
similarity index 96%
rename from core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyAdvertisement.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyAdvertisement.java
index 00873ad..7e754fc 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyAdvertisement.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyAdvertisement.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyRequest.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyRequest.java
similarity index 95%
rename from core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyRequest.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyRequest.java
index 6f3096b..7b63c08 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceAntiEntropyRequest.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceAntiEntropyRequest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceClockManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceClockManager.java
index e1e3692..48355cf 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceClockManager.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceClockManager.java
@@ -10,12 +10,12 @@
 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.cluster.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
-import org.onlab.onos.store.ClockProviderService;
-import org.onlab.onos.store.ClockService;
+import org.onlab.onos.net.device.DeviceClockProviderService;
+import org.onlab.onos.net.device.DeviceClockService;
 import org.onlab.onos.store.Timestamp;
-import org.onlab.onos.store.common.impl.MastershipBasedTimestamp;
+import org.onlab.onos.store.impl.MastershipBasedTimestamp;
 import org.slf4j.Logger;
 
 /**
@@ -23,7 +23,7 @@
  */
 @Component(immediate = true)
 @Service
-public class DeviceClockManager implements ClockService, ClockProviderService {
+public class DeviceClockManager implements DeviceClockService, DeviceClockProviderService {
 
     private final Logger log = getLogger(getClass());
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
index f7fd7bc..03c293a 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
@@ -58,7 +58,7 @@
      *
      * @param newDesc new DeviceDescription
      */
-    public synchronized void putDeviceDesc(Timestamped<DeviceDescription> newDesc) {
+    public void putDeviceDesc(Timestamped<DeviceDescription> newDesc) {
         Timestamped<DeviceDescription> oldOne = deviceDesc;
         Timestamped<DeviceDescription> newOne = newDesc;
         if (oldOne != null) {
@@ -76,7 +76,7 @@
      *
      * @param newDesc new PortDescription
      */
-    public synchronized void putPortDesc(Timestamped<PortDescription> newDesc) {
+    public void putPortDesc(Timestamped<PortDescription> newDesc) {
         Timestamped<PortDescription> oldOne = portDescs.get(newDesc.value().portNumber());
         Timestamped<PortDescription> newOne = newDesc;
         if (oldOne != null) {
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentId.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceFragmentId.java
similarity index 96%
rename from core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentId.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceFragmentId.java
index d4fcda9..411a9e8 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentId.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceFragmentId.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import java.util.Objects;
 
@@ -51,4 +51,4 @@
         this.providerId = null;
         this.deviceId = null;
     }
-}
\ No newline at end of file
+}
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
index 6ab529a..9c2c759 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
@@ -1,5 +1,6 @@
 package org.onlab.onos.store.device.impl;
 
+import com.google.common.base.Function;
 import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Maps;
@@ -24,6 +25,7 @@
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.Port;
 import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.device.DeviceClockService;
 import org.onlab.onos.net.device.DeviceDescription;
 import org.onlab.onos.net.device.DeviceEvent;
 import org.onlab.onos.net.device.DeviceStore;
@@ -31,16 +33,12 @@
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.net.provider.ProviderId;
 import org.onlab.onos.store.AbstractStore;
-import org.onlab.onos.store.ClockService;
 import org.onlab.onos.store.Timestamp;
 import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService;
 import org.onlab.onos.store.cluster.messaging.ClusterMessage;
 import org.onlab.onos.store.cluster.messaging.ClusterMessageHandler;
 import org.onlab.onos.store.cluster.messaging.MessageSubject;
 import org.onlab.onos.store.common.impl.Timestamped;
-import org.onlab.onos.store.device.impl.peermsg.DeviceAntiEntropyAdvertisement;
-import org.onlab.onos.store.device.impl.peermsg.DeviceFragmentId;
-import org.onlab.onos.store.device.impl.peermsg.PortFragmentId;
 import org.onlab.onos.store.serializers.KryoSerializer;
 import org.onlab.onos.store.serializers.DistributedStoreSerializers;
 import org.onlab.util.KryoPool;
@@ -110,7 +108,7 @@
     private final Set<DeviceId> availableDevices = Sets.newConcurrentHashSet();
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected ClockService clockService;
+    protected DeviceClockService deviceClockService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ClusterCommunicationService clusterCommunicator;
@@ -118,7 +116,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ClusterService clusterService;
 
-    private static final KryoSerializer SERIALIZER = new KryoSerializer() {
+    protected static final KryoSerializer SERIALIZER = new KryoSerializer() {
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoPool.newBuilder()
@@ -206,14 +204,19 @@
     public synchronized DeviceEvent createOrUpdateDevice(ProviderId providerId,
                                      DeviceId deviceId,
                                      DeviceDescription deviceDescription) {
-        Timestamp newTimestamp = clockService.getTimestamp(deviceId);
+        final Timestamp newTimestamp = deviceClockService.getTimestamp(deviceId);
         final Timestamped<DeviceDescription> deltaDesc = new Timestamped<>(deviceDescription, newTimestamp);
-        DeviceEvent event = createOrUpdateDeviceInternal(providerId, deviceId, deltaDesc);
+        final DeviceEvent event;
+        final Timestamped<DeviceDescription> mergedDesc;
+        synchronized (getDeviceDescriptions(deviceId)) {
+            event = createOrUpdateDeviceInternal(providerId, deviceId, deltaDesc);
+            mergedDesc = getDeviceDescriptions(deviceId).get(providerId).getDeviceDesc();
+        }
         if (event != null) {
             log.info("Notifying peers of a device update topology event for providerId: {} and deviceId: {}",
                 providerId, deviceId);
             try {
-                notifyPeers(new InternalDeviceEvent(providerId, deviceId, deltaDesc));
+                notifyPeers(new InternalDeviceEvent(providerId, deviceId, mergedDesc));
             } catch (IOException e) {
                 log.error("Failed to notify peers of a device update topology event for providerId: "
                         + providerId + " and deviceId: " + deviceId, e);
@@ -317,8 +320,8 @@
 
     @Override
     public DeviceEvent markOffline(DeviceId deviceId) {
-        Timestamp timestamp = clockService.getTimestamp(deviceId);
-        DeviceEvent event = markOfflineInternal(deviceId, timestamp);
+        final Timestamp timestamp = deviceClockService.getTimestamp(deviceId);
+        final DeviceEvent event = markOfflineInternal(deviceId, timestamp);
         if (event != null) {
             log.info("Notifying peers of a device offline topology event for deviceId: {}",
                     deviceId);
@@ -390,17 +393,33 @@
     public synchronized List<DeviceEvent> updatePorts(ProviderId providerId,
                                        DeviceId deviceId,
                                        List<PortDescription> portDescriptions) {
-        Timestamp newTimestamp = clockService.getTimestamp(deviceId);
 
-        Timestamped<List<PortDescription>> timestampedPortDescriptions =
-            new Timestamped<>(portDescriptions, newTimestamp);
+        final Timestamp newTimestamp = deviceClockService.getTimestamp(deviceId);
 
-        List<DeviceEvent> events = updatePortsInternal(providerId, deviceId, timestampedPortDescriptions);
+        final Timestamped<List<PortDescription>> timestampedInput
+                = new Timestamped<>(portDescriptions, newTimestamp);
+        final List<DeviceEvent> events;
+        final Timestamped<List<PortDescription>> merged;
+
+        synchronized (getDeviceDescriptions(deviceId)) {
+            events = updatePortsInternal(providerId, deviceId, timestampedInput);
+            final DeviceDescriptions descs = getDeviceDescriptions(deviceId).get(providerId);
+            List<PortDescription> mergedList =
+                    FluentIterable.from(portDescriptions)
+                .transform(new Function<PortDescription, PortDescription>() {
+                    @Override
+                    public PortDescription apply(PortDescription input) {
+                        // lookup merged port description
+                        return descs.getPortDesc(input.portNumber()).value();
+                    }
+                }).toList();
+            merged = new Timestamped<List<PortDescription>>(mergedList, newTimestamp);
+        }
         if (!events.isEmpty()) {
             log.info("Notifying peers of a port update topology event for providerId: {} and deviceId: {}",
                     providerId, deviceId);
             try {
-                notifyPeers(new InternalPortEvent(providerId, deviceId, timestampedPortDescriptions));
+                notifyPeers(new InternalPortEvent(providerId, deviceId, merged));
             } catch (IOException e) {
                 log.error("Failed to notify peers of a port update topology event or providerId: "
                     + providerId + " and deviceId: " + deviceId, e);
@@ -527,16 +546,25 @@
     }
 
     @Override
-    public synchronized DeviceEvent updatePortStatus(ProviderId providerId, DeviceId deviceId,
-            PortDescription portDescription) {
-        Timestamp newTimestamp = clockService.getTimestamp(deviceId);
-        final Timestamped<PortDescription> deltaDesc = new Timestamped<>(portDescription, newTimestamp);
-        DeviceEvent event = updatePortStatusInternal(providerId, deviceId, deltaDesc);
+    public synchronized DeviceEvent updatePortStatus(ProviderId providerId,
+                                                     DeviceId deviceId,
+                                                     PortDescription portDescription) {
+
+        final Timestamp newTimestamp = deviceClockService.getTimestamp(deviceId);
+        final Timestamped<PortDescription> deltaDesc
+            = new Timestamped<>(portDescription, newTimestamp);
+        final DeviceEvent event;
+        final Timestamped<PortDescription> mergedDesc;
+        synchronized (getDeviceDescriptions(deviceId)) {
+            event = updatePortStatusInternal(providerId, deviceId, deltaDesc);
+            mergedDesc = getDeviceDescriptions(deviceId).get(providerId)
+                            .getPortDesc(portDescription.portNumber());
+        }
         if (event != null) {
             log.info("Notifying peers of a port status update topology event for providerId: {} and deviceId: {}",
                         providerId, deviceId);
             try {
-                notifyPeers(new InternalPortStatusEvent(providerId, deviceId, deltaDesc));
+                notifyPeers(new InternalPortStatusEvent(providerId, deviceId, mergedDesc));
             } catch (IOException e) {
                 log.error("Failed to notify peers of a port status update topology event or providerId: "
                         + providerId + " and deviceId: " + deviceId, e);
@@ -615,7 +643,7 @@
 
     @Override
     public synchronized DeviceEvent removeDevice(DeviceId deviceId) {
-        Timestamp timestamp = clockService.getTimestamp(deviceId);
+        Timestamp timestamp = deviceClockService.getTimestamp(deviceId);
         DeviceEvent event = removeDeviceInternal(deviceId, timestamp);
         if (event != null) {
             log.info("Notifying peers of a device removed topology event for deviceId: {}",
@@ -684,7 +712,7 @@
      * @return Device instance
      */
     private Device composeDevice(DeviceId deviceId,
-            ConcurrentMap<ProviderId, DeviceDescriptions> providerDescs) {
+            Map<ProviderId, DeviceDescriptions> providerDescs) {
 
         checkArgument(!providerDescs.isEmpty(), "No Device descriptions supplied");
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/InitDeviceDescs.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/InitDeviceDescs.java
index 2de2364..936723a 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/InitDeviceDescs.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/InitDeviceDescs.java
@@ -20,4 +20,4 @@
     public DeviceDescriptions get() throws ConcurrentException {
         return new DeviceDescriptions(deviceDesc);
     }
-}
\ No newline at end of file
+}
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentId.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/PortFragmentId.java
similarity index 96%
rename from core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentId.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/device/impl/PortFragmentId.java
index 8e7bac3..0ac3643 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentId.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/PortFragmentId.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import java.util.Objects;
 
@@ -58,4 +58,4 @@
         this.deviceId = null;
         this.portNumber = null;
     }
-}
\ No newline at end of file
+}
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/package-info.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/package-info.java
deleted file mode 100644
index 5d9dc4b..0000000
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/peermsg/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Structure and utilities used for inter-Node messaging.
- */
-package org.onlab.onos.store.device.impl.peermsg;
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestamp.java b/core/store/dist/src/main/java/org/onlab/onos/store/impl/MastershipBasedTimestamp.java
similarity index 98%
rename from core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestamp.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/impl/MastershipBasedTimestamp.java
index 0f4f894..e6317bb 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestamp.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/impl/MastershipBasedTimestamp.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.common.impl;
+package org.onlab.onos.store.impl;
 
 import static com.google.common.base.Preconditions.checkArgument;
 
diff --git a/core/store/hz/common/src/main/java/org/onlab/onos/store/impl/package-info.java b/core/store/dist/src/main/java/org/onlab/onos/store/impl/package-info.java
similarity index 100%
rename from core/store/hz/common/src/main/java/org/onlab/onos/store/impl/package-info.java
rename to core/store/dist/src/main/java/org/onlab/onos/store/impl/package-info.java
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
index 3c3cc5a..4cb936e 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
@@ -29,6 +29,7 @@
 import org.onlab.onos.net.Link.Type;
 import org.onlab.onos.net.LinkKey;
 import org.onlab.onos.net.Provided;
+import org.onlab.onos.net.device.DeviceClockService;
 import org.onlab.onos.net.link.DefaultLinkDescription;
 import org.onlab.onos.net.link.LinkDescription;
 import org.onlab.onos.net.link.LinkEvent;
@@ -36,7 +37,6 @@
 import org.onlab.onos.net.link.LinkStoreDelegate;
 import org.onlab.onos.net.provider.ProviderId;
 import org.onlab.onos.store.AbstractStore;
-import org.onlab.onos.store.ClockService;
 import org.onlab.onos.store.Timestamp;
 import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService;
 import org.onlab.onos.store.cluster.messaging.ClusterMessage;
@@ -100,7 +100,7 @@
     private final Map<LinkKey, Timestamp> removedLinks = Maps.newHashMap();
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected ClockService clockService;
+    protected DeviceClockService deviceClockService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ClusterCommunicationService clusterCommunicator;
@@ -223,7 +223,7 @@
                                         LinkDescription linkDescription) {
 
         DeviceId dstDeviceId = linkDescription.dst().deviceId();
-        Timestamp newTimestamp = clockService.getTimestamp(dstDeviceId);
+        Timestamp newTimestamp = deviceClockService.getTimestamp(dstDeviceId);
 
         final Timestamped<LinkDescription> deltaDesc = new Timestamped<>(linkDescription, newTimestamp);
 
@@ -344,7 +344,7 @@
         final LinkKey key = new LinkKey(src, dst);
 
         DeviceId dstDeviceId = dst.deviceId();
-        Timestamp timestamp = clockService.getTimestamp(dstDeviceId);
+        Timestamp timestamp = deviceClockService.getTimestamp(dstDeviceId);
 
         LinkEvent event = removeLinkInternal(key, timestamp);
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/InternalLinkRemovedEvent.java b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/InternalLinkRemovedEvent.java
index 22e65ed..7864580 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/InternalLinkRemovedEvent.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/InternalLinkRemovedEvent.java
@@ -46,4 +46,4 @@
         linkKey = null;
         timestamp = null;
     }
-}
\ No newline at end of file
+}
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
index e0ba906..c410103 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
@@ -1,7 +1,7 @@
 package org.onlab.onos.store.serializers;
 
-import org.onlab.onos.store.common.impl.MastershipBasedTimestamp;
 import org.onlab.onos.store.common.impl.Timestamped;
+import org.onlab.onos.store.impl.MastershipBasedTimestamp;
 import org.onlab.util.KryoPool;
 
 public final class DistributedStoreSerializers {
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/MastershipBasedTimestampSerializer.java b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/MastershipBasedTimestampSerializer.java
index 516915e..062ae03 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/MastershipBasedTimestampSerializer.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/MastershipBasedTimestampSerializer.java
@@ -1,6 +1,6 @@
 package org.onlab.onos.store.serializers;
 
-import org.onlab.onos.store.common.impl.MastershipBasedTimestamp;
+import org.onlab.onos.store.impl.MastershipBasedTimestamp;
 
 import com.esotericsoftware.kryo.Kryo;
 import com.esotericsoftware.kryo.Serializer;
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/cluster/impl/ClusterCommunicationManagerTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManagerTest.java
similarity index 95%
rename from core/store/dist/src/test/java/org/onlab/onos/store/cluster/impl/ClusterCommunicationManagerTest.java
rename to core/store/dist/src/test/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManagerTest.java
index e63fcaa..dcbe437 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/cluster/impl/ClusterCommunicationManagerTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManagerTest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.cluster.impl;
+package org.onlab.onos.store.cluster.messaging.impl;
 
 import org.junit.After;
 import org.junit.Before;
@@ -6,8 +6,7 @@
 import org.junit.Test;
 import org.onlab.onos.cluster.DefaultControllerNode;
 import org.onlab.onos.cluster.NodeId;
-import org.onlab.onos.store.cluster.messaging.impl.ClusterCommunicationManager;
-import org.onlab.onos.store.cluster.messaging.impl.MessageSerializer;
+import org.onlab.onos.store.cluster.impl.ClusterNodesDelegate;
 import org.onlab.netty.NettyMessagingService;
 import org.onlab.packet.IpPrefix;
 
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/TimestampedTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/TimestampedTest.java
index 4b44d40..deb3e4d 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/TimestampedTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/TimestampedTest.java
@@ -6,6 +6,7 @@
 
 import org.junit.Test;
 import org.onlab.onos.store.Timestamp;
+import org.onlab.onos.store.impl.MastershipBasedTimestamp;
 import org.onlab.util.KryoPool;
 
 import com.google.common.testing.EqualsTester;
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentIdTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/DeviceFragmentIdTest.java
similarity index 95%
rename from core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentIdTest.java
rename to core/store/dist/src/test/java/org/onlab/onos/store/device/impl/DeviceFragmentIdTest.java
index 85ba4a7..3a532fd 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/DeviceFragmentIdTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/DeviceFragmentIdTest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import static org.onlab.onos.net.DeviceId.deviceId;
 
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/GossipDeviceStoreTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/GossipDeviceStoreTest.java
index fa42a6b..141f2b2 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/GossipDeviceStoreTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/GossipDeviceStoreTest.java
@@ -1,12 +1,17 @@
 package org.onlab.onos.store.device.impl;
 
+import static org.easymock.EasyMock.*;
 import static org.junit.Assert.*;
 import static org.onlab.onos.net.Device.Type.SWITCH;
 import static org.onlab.onos.net.DeviceId.deviceId;
 import static org.onlab.onos.net.device.DeviceEvent.Type.*;
+import static org.onlab.onos.cluster.ControllerNode.State.*;
+import static org.onlab.onos.net.DefaultAnnotations.union;
+import static java.util.Arrays.asList;
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -14,6 +19,7 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
+import org.easymock.Capture;
 import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
@@ -25,8 +31,8 @@
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.ControllerNode.State;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.Annotations;
 import org.onlab.onos.net.DefaultAnnotations;
 import org.onlab.onos.net.Device;
@@ -36,13 +42,13 @@
 import org.onlab.onos.net.SparseAnnotations;
 import org.onlab.onos.net.device.DefaultDeviceDescription;
 import org.onlab.onos.net.device.DefaultPortDescription;
+import org.onlab.onos.net.device.DeviceClockService;
 import org.onlab.onos.net.device.DeviceDescription;
 import org.onlab.onos.net.device.DeviceEvent;
 import org.onlab.onos.net.device.DeviceStore;
 import org.onlab.onos.net.device.DeviceStoreDelegate;
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.net.provider.ProviderId;
-import org.onlab.onos.store.ClockService;
 import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService;
 import org.onlab.onos.store.cluster.messaging.ClusterMessage;
 import org.onlab.onos.store.cluster.messaging.ClusterMessageHandler;
@@ -90,14 +96,25 @@
             .set("B4", "b4")
             .build();
 
-    private static final NodeId MYSELF = new NodeId("myself");
+    // local node
+    private static final NodeId NID1 = new NodeId("local");
+    private static final ControllerNode ONOS1 =
+            new DefaultControllerNode(NID1, IpPrefix.valueOf("127.0.0.1"));
 
+    // remote node
+    private static final NodeId NID2 = new NodeId("remote");
+    private static final ControllerNode ONOS2 =
+            new DefaultControllerNode(NID2, IpPrefix.valueOf("127.0.0.2"));
+    private static final List<SparseAnnotations> NO_ANNOTATION = Collections.<SparseAnnotations>emptyList();
+
+
+    private TestGossipDeviceStore testGossipDeviceStore;
     private GossipDeviceStore gossipDeviceStore;
     private DeviceStore deviceStore;
 
     private DeviceClockManager deviceClockManager;
-    private ClockService clockService;
-
+    private DeviceClockService deviceClockService;
+    private ClusterCommunicationService clusterCommunicator;
     @BeforeClass
     public static void setUpBeforeClass() throws Exception {
     }
@@ -111,17 +128,24 @@
     public void setUp() throws Exception {
         deviceClockManager = new DeviceClockManager();
         deviceClockManager.activate();
-        clockService = deviceClockManager;
+        deviceClockService = deviceClockManager;
 
-        deviceClockManager.setMastershipTerm(DID1, MastershipTerm.of(MYSELF, 1));
-        deviceClockManager.setMastershipTerm(DID2, MastershipTerm.of(MYSELF, 2));
+        deviceClockManager.setMastershipTerm(DID1, MastershipTerm.of(NID1, 1));
+        deviceClockManager.setMastershipTerm(DID2, MastershipTerm.of(NID1, 2));
 
-        ClusterCommunicationService clusterCommunicator = new TestClusterCommunicationService();
+        clusterCommunicator = createNiceMock(ClusterCommunicationService.class);
+        clusterCommunicator.addSubscriber(anyObject(MessageSubject.class),
+                                    anyObject(ClusterMessageHandler.class));
+        expectLastCall().anyTimes();
+        replay(clusterCommunicator);
         ClusterService clusterService = new TestClusterService();
 
-        gossipDeviceStore = new TestGossipDeviceStore(clockService, clusterService, clusterCommunicator);
+        testGossipDeviceStore = new TestGossipDeviceStore(deviceClockService, clusterService, clusterCommunicator);
+        gossipDeviceStore = testGossipDeviceStore;
         gossipDeviceStore.activate();
         deviceStore = gossipDeviceStore;
+        verify(clusterCommunicator);
+        reset(clusterCommunicator);
     }
 
     @After
@@ -135,7 +159,16 @@
         DeviceDescription description =
                 new DefaultDeviceDescription(deviceId.uri(), SWITCH, MFR,
                         HW, swVersion, SN, annotations);
+        reset(clusterCommunicator);
+        try {
+            expect(clusterCommunicator.broadcast(anyObject(ClusterMessage.class)))
+                .andReturn(true).anyTimes();
+        } catch (IOException e) {
+            fail("Should never reach here");
+        }
+        replay(clusterCommunicator);
         deviceStore.createOrUpdateDevice(PID, deviceId, description);
+        verify(clusterCommunicator);
     }
 
     private void putDeviceAncillary(DeviceId deviceId, String swVersion,
@@ -163,9 +196,9 @@
      * @param annotations
      */
     private static void assertAnnotationsEquals(Annotations actual, SparseAnnotations... annotations) {
-        DefaultAnnotations expected = DefaultAnnotations.builder().build();
+        SparseAnnotations expected = DefaultAnnotations.builder().build();
         for (SparseAnnotations a : annotations) {
-            expected = DefaultAnnotations.merge(expected, a);
+            expected = DefaultAnnotations.union(expected, a);
         }
         assertEquals(expected.keys(), actual.keys());
         for (String key : expected.keys()) {
@@ -173,6 +206,36 @@
         }
     }
 
+    private static void assertDeviceDescriptionEquals(DeviceDescription expected,
+                                                DeviceDescription actual) {
+        if (expected == actual) {
+            return;
+        }
+        assertEquals(expected.deviceURI(), actual.deviceURI());
+        assertEquals(expected.hwVersion(), actual.hwVersion());
+        assertEquals(expected.manufacturer(), actual.manufacturer());
+        assertEquals(expected.serialNumber(), actual.serialNumber());
+        assertEquals(expected.swVersion(), actual.swVersion());
+
+        assertAnnotationsEquals(actual.annotations(), expected.annotations());
+    }
+
+    private static void assertDeviceDescriptionEquals(DeviceDescription expected,
+            List<SparseAnnotations> expectedAnnotations,
+            DeviceDescription actual) {
+        if (expected == actual) {
+            return;
+        }
+        assertEquals(expected.deviceURI(), actual.deviceURI());
+        assertEquals(expected.hwVersion(), actual.hwVersion());
+        assertEquals(expected.manufacturer(), actual.manufacturer());
+        assertEquals(expected.serialNumber(), actual.serialNumber());
+        assertEquals(expected.swVersion(), actual.swVersion());
+
+        assertAnnotationsEquals(actual.annotations(),
+                expectedAnnotations.toArray(new SparseAnnotations[0]));
+    }
+
     @Test
     public final void testGetDeviceCount() {
         assertEquals("initialy empty", 0, deviceStore.getDeviceCount());
@@ -215,56 +278,123 @@
         assertNull("DID2 shouldn't be there", deviceStore.getDevice(DID2));
     }
 
+    private void assertInternalDeviceEvent(NodeId sender,
+                                           DeviceId deviceId,
+                                           ProviderId providerId,
+                                           DeviceDescription expectedDesc,
+                                           Capture<ClusterMessage> actualMsg) {
+        assertTrue(actualMsg.hasCaptured());
+        assertEquals(sender, actualMsg.getValue().sender());
+        assertEquals(GossipDeviceStoreMessageSubjects.DEVICE_UPDATE,
+                     actualMsg.getValue().subject());
+        InternalDeviceEvent addEvent
+            = testGossipDeviceStore.deserialize(actualMsg.getValue().payload());
+        assertEquals(deviceId, addEvent.deviceId());
+        assertEquals(providerId, addEvent.providerId());
+        assertDeviceDescriptionEquals(expectedDesc, addEvent.deviceDescription().value());
+    }
+
+    private void assertInternalDeviceEvent(NodeId sender,
+                                           DeviceId deviceId,
+                                           ProviderId providerId,
+                                           DeviceDescription expectedDesc,
+                                           List<SparseAnnotations> expectedAnnotations,
+                                           Capture<ClusterMessage> actualMsg) {
+        assertTrue(actualMsg.hasCaptured());
+        assertEquals(sender, actualMsg.getValue().sender());
+        assertEquals(GossipDeviceStoreMessageSubjects.DEVICE_UPDATE,
+                actualMsg.getValue().subject());
+        InternalDeviceEvent addEvent
+            = testGossipDeviceStore.deserialize(actualMsg.getValue().payload());
+        assertEquals(deviceId, addEvent.deviceId());
+        assertEquals(providerId, addEvent.providerId());
+        assertDeviceDescriptionEquals(expectedDesc, expectedAnnotations, addEvent.deviceDescription().value());
+    }
+
     @Test
-    public final void testCreateOrUpdateDevice() {
+    public final void testCreateOrUpdateDevice() throws IOException {
         DeviceDescription description =
                 new DefaultDeviceDescription(DID1.uri(), SWITCH, MFR,
                         HW, SW1, SN);
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         DeviceEvent event = deviceStore.createOrUpdateDevice(PID, DID1, description);
         assertEquals(DEVICE_ADDED, event.type());
         assertDevice(DID1, SW1, event.subject());
+        verify(clusterCommunicator);
+        assertInternalDeviceEvent(NID1, DID1, PID, description, bcast);
+
 
         DeviceDescription description2 =
                 new DefaultDeviceDescription(DID1.uri(), SWITCH, MFR,
                         HW, SW2, SN);
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         DeviceEvent event2 = deviceStore.createOrUpdateDevice(PID, DID1, description2);
         assertEquals(DEVICE_UPDATED, event2.type());
         assertDevice(DID1, SW2, event2.subject());
 
+        verify(clusterCommunicator);
+        assertInternalDeviceEvent(NID1, DID1, PID, description2, bcast);
+        reset(clusterCommunicator);
+
         assertNull("No change expected", deviceStore.createOrUpdateDevice(PID, DID1, description2));
     }
 
     @Test
-    public final void testCreateOrUpdateDeviceAncillary() {
+    public final void testCreateOrUpdateDeviceAncillary() throws IOException {
+        // add
         DeviceDescription description =
                 new DefaultDeviceDescription(DID1.uri(), SWITCH, MFR,
                         HW, SW1, SN, A2);
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         DeviceEvent event = deviceStore.createOrUpdateDevice(PIDA, DID1, description);
         assertEquals(DEVICE_ADDED, event.type());
         assertDevice(DID1, SW1, event.subject());
         assertEquals(PIDA, event.subject().providerId());
         assertAnnotationsEquals(event.subject().annotations(), A2);
         assertFalse("Ancillary will not bring device up", deviceStore.isAvailable(DID1));
+        verify(clusterCommunicator);
+        assertInternalDeviceEvent(NID1, DID1, PIDA, description, bcast);
 
+        // update from primary
         DeviceDescription description2 =
                 new DefaultDeviceDescription(DID1.uri(), SWITCH, MFR,
                         HW, SW2, SN, A1);
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+
         DeviceEvent event2 = deviceStore.createOrUpdateDevice(PID, DID1, description2);
         assertEquals(DEVICE_UPDATED, event2.type());
         assertDevice(DID1, SW2, event2.subject());
         assertEquals(PID, event2.subject().providerId());
         assertAnnotationsEquals(event2.subject().annotations(), A1, A2);
         assertTrue(deviceStore.isAvailable(DID1));
+        verify(clusterCommunicator);
+        assertInternalDeviceEvent(NID1, DID1, PID, description2, bcast);
 
+        // no-op update from primary
+        resetCommunicatorExpectingNoBroadcast(bcast);
         assertNull("No change expected", deviceStore.createOrUpdateDevice(PID, DID1, description2));
 
+        verify(clusterCommunicator);
+        assertFalse("no broadcast expected", bcast.hasCaptured());
+
         // For now, Ancillary is ignored once primary appears
+        resetCommunicatorExpectingNoBroadcast(bcast);
+
         assertNull("No change expected", deviceStore.createOrUpdateDevice(PIDA, DID1, description));
 
+        verify(clusterCommunicator);
+        assertFalse("no broadcast expected", bcast.hasCaptured());
+
         // But, Ancillary annotations will be in effect
         DeviceDescription description3 =
                 new DefaultDeviceDescription(DID1.uri(), SWITCH, MFR,
                         HW, SW1, SN, A2_2);
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+
         DeviceEvent event3 = deviceStore.createOrUpdateDevice(PIDA, DID1, description3);
         assertEquals(DEVICE_UPDATED, event3.type());
         // basic information will be the one from Primary
@@ -273,6 +403,11 @@
         // but annotation from Ancillary will be merged
         assertAnnotationsEquals(event3.subject().annotations(), A1, A2, A2_2);
         assertTrue(deviceStore.isAvailable(DID1));
+        verify(clusterCommunicator);
+        // note: only annotation from PIDA is sent over the wire
+        assertInternalDeviceEvent(NID1, DID1, PIDA, description3,
+                                  asList(union(A2, A2_2)), bcast);
+
     }
 
 
@@ -282,14 +417,24 @@
         putDevice(DID1, SW1);
         assertTrue(deviceStore.isAvailable(DID1));
 
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         DeviceEvent event = deviceStore.markOffline(DID1);
         assertEquals(DEVICE_AVAILABILITY_CHANGED, event.type());
         assertDevice(DID1, SW1, event.subject());
         assertFalse(deviceStore.isAvailable(DID1));
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message
+        assertTrue(bcast.hasCaptured());
 
+
+        resetCommunicatorExpectingNoBroadcast(bcast);
         DeviceEvent event2 = deviceStore.markOffline(DID1);
         assertNull("No change, no event", event2);
-}
+        verify(clusterCommunicator);
+        assertFalse(bcast.hasCaptured());
+    }
 
     @Test
     public final void testUpdatePorts() {
@@ -298,8 +443,13 @@
                 new DefaultPortDescription(P1, true),
                 new DefaultPortDescription(P2, true)
                 );
+        Capture<ClusterMessage> bcast = new Capture<>();
 
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         List<DeviceEvent> events = deviceStore.updatePorts(PID, DID1, pds);
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message
+        assertTrue(bcast.hasCaptured());
 
         Set<PortNumber> expectedPorts = Sets.newHashSet(P1, P2);
         for (DeviceEvent event : events) {
@@ -318,7 +468,12 @@
                 new DefaultPortDescription(P3, true)
                 );
 
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         events = deviceStore.updatePorts(PID, DID1, pds2);
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message
+        assertTrue(bcast.hasCaptured());
+
         assertFalse("event should be triggered", events.isEmpty());
         for (DeviceEvent event : events) {
             PortNumber num = event.port().number();
@@ -341,7 +496,12 @@
                 new DefaultPortDescription(P1, false),
                 new DefaultPortDescription(P2, true)
                 );
+        resetCommunicatorExpectingSingleBroadcast(bcast);
         events = deviceStore.updatePorts(PID, DID1, pds3);
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message
+        assertTrue(bcast.hasCaptured());
+
         assertFalse("event should be triggered", events.isEmpty());
         for (DeviceEvent event : events) {
             PortNumber num = event.port().number();
@@ -357,7 +517,6 @@
                 fail("Unknown port number encountered: " + num);
             }
         }
-
     }
 
     @Test
@@ -368,16 +527,22 @@
                 );
         deviceStore.updatePorts(PID, DID1, pds);
 
-        DeviceEvent event = deviceStore.updatePortStatus(PID, DID1,
-                new DefaultPortDescription(P1, false));
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+        final DefaultPortDescription desc = new DefaultPortDescription(P1, false);
+        DeviceEvent event = deviceStore.updatePortStatus(PID, DID1, desc);
         assertEquals(PORT_UPDATED, event.type());
         assertDevice(DID1, SW1, event.subject());
         assertEquals(P1, event.port().number());
         assertFalse("Port is disabled", event.port().isEnabled());
-
+        verify(clusterCommunicator);
+        assertInternalPortStatusEvent(NID1, DID1, PID, desc, NO_ANNOTATION, bcast);
+        assertTrue(bcast.hasCaptured());
     }
+
     @Test
-    public final void testUpdatePortStatusAncillary() {
+    public final void testUpdatePortStatusAncillary() throws IOException {
         putDeviceAncillary(DID1, SW1);
         putDevice(DID1, SW1);
         List<PortDescription> pds = Arrays.<PortDescription>asList(
@@ -385,36 +550,106 @@
                 );
         deviceStore.updatePorts(PID, DID1, pds);
 
-        DeviceEvent event = deviceStore.updatePortStatus(PID, DID1,
-                new DefaultPortDescription(P1, false, A1_2));
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+
+        // update port from primary
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+        final DefaultPortDescription desc1 = new DefaultPortDescription(P1, false, A1_2);
+        DeviceEvent event = deviceStore.updatePortStatus(PID, DID1, desc1);
         assertEquals(PORT_UPDATED, event.type());
         assertDevice(DID1, SW1, event.subject());
         assertEquals(P1, event.port().number());
         assertAnnotationsEquals(event.port().annotations(), A1, A1_2);
         assertFalse("Port is disabled", event.port().isEnabled());
+        verify(clusterCommunicator);
+        assertInternalPortStatusEvent(NID1, DID1, PID, desc1, asList(A1, A1_2), bcast);
+        assertTrue(bcast.hasCaptured());
 
-        DeviceEvent event2 = deviceStore.updatePortStatus(PIDA, DID1,
-                new DefaultPortDescription(P1, true));
+        // update port from ancillary with no attributes
+        resetCommunicatorExpectingNoBroadcast(bcast);
+        final DefaultPortDescription desc2 = new DefaultPortDescription(P1, true);
+        DeviceEvent event2 = deviceStore.updatePortStatus(PIDA, DID1, desc2);
         assertNull("Ancillary is ignored if primary exists", event2);
+        verify(clusterCommunicator);
+        assertFalse(bcast.hasCaptured());
 
         // but, Ancillary annotation update will be notified
-        DeviceEvent event3 = deviceStore.updatePortStatus(PIDA, DID1,
-                new DefaultPortDescription(P1, true, A2));
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+        final DefaultPortDescription desc3 = new DefaultPortDescription(P1, true, A2);
+        DeviceEvent event3 = deviceStore.updatePortStatus(PIDA, DID1, desc3);
         assertEquals(PORT_UPDATED, event3.type());
         assertDevice(DID1, SW1, event3.subject());
         assertEquals(P1, event3.port().number());
         assertAnnotationsEquals(event3.port().annotations(), A1, A1_2, A2);
         assertFalse("Port is disabled", event3.port().isEnabled());
+        verify(clusterCommunicator);
+        assertInternalPortStatusEvent(NID1, DID1, PIDA, desc3, asList(A2), bcast);
+        assertTrue(bcast.hasCaptured());
 
         // port only reported from Ancillary will be notified as down
-        DeviceEvent event4 = deviceStore.updatePortStatus(PIDA, DID1,
-                new DefaultPortDescription(P2, true));
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+        final DefaultPortDescription desc4 = new DefaultPortDescription(P2, true);
+        DeviceEvent event4 = deviceStore.updatePortStatus(PIDA, DID1, desc4);
         assertEquals(PORT_ADDED, event4.type());
         assertDevice(DID1, SW1, event4.subject());
         assertEquals(P2, event4.port().number());
         assertAnnotationsEquals(event4.port().annotations());
         assertFalse("Port is disabled if not given from primary provider",
                         event4.port().isEnabled());
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message content
+        assertInternalPortStatusEvent(NID1, DID1, PIDA, desc4, NO_ANNOTATION, bcast);
+        assertTrue(bcast.hasCaptured());
+    }
+
+    private void assertInternalPortStatusEvent(NodeId sender, DeviceId did,
+            ProviderId pid, DefaultPortDescription expectedDesc,
+            List<SparseAnnotations> expectedAnnotations, Capture<ClusterMessage> actualMsg) {
+
+        assertTrue(actualMsg.hasCaptured());
+        assertEquals(sender, actualMsg.getValue().sender());
+        assertEquals(GossipDeviceStoreMessageSubjects.PORT_STATUS_UPDATE,
+                actualMsg.getValue().subject());
+        InternalPortStatusEvent addEvent
+            = testGossipDeviceStore.deserialize(actualMsg.getValue().payload());
+        assertEquals(did, addEvent.deviceId());
+        assertEquals(pid, addEvent.providerId());
+        assertPortDescriptionEquals(expectedDesc, expectedAnnotations,
+                addEvent.portDescription().value());
+
+    }
+
+    private void assertPortDescriptionEquals(
+                                    PortDescription expectedDesc,
+                                    List<SparseAnnotations> expectedAnnotations,
+                                    PortDescription actual) {
+
+        assertEquals(expectedDesc.portNumber(), actual.portNumber());
+        assertEquals(expectedDesc.isEnabled(), actual.isEnabled());
+
+        assertAnnotationsEquals(actual.annotations(),
+                         expectedAnnotations.toArray(new SparseAnnotations[0]));
+    }
+
+    private void resetCommunicatorExpectingNoBroadcast(
+            Capture<ClusterMessage> bcast) {
+        bcast.reset();
+        reset(clusterCommunicator);
+        replay(clusterCommunicator);
+    }
+
+    private void resetCommunicatorExpectingSingleBroadcast(
+            Capture<ClusterMessage> bcast) {
+
+        bcast.reset();
+        reset(clusterCommunicator);
+        try {
+            expect(clusterCommunicator.broadcast(capture(bcast))).andReturn(true).once();
+        } catch (IOException e) {
+            fail("Should never reach here");
+        }
+        replay(clusterCommunicator);
     }
 
     @Test
@@ -476,12 +711,19 @@
         assertAnnotationsEquals(deviceStore.getDevice(DID1).annotations(), A1);
         assertAnnotationsEquals(deviceStore.getPort(DID1, P1).annotations(), A2);
 
+        Capture<ClusterMessage> bcast = new Capture<>();
+
+        resetCommunicatorExpectingSingleBroadcast(bcast);
+
         DeviceEvent event = deviceStore.removeDevice(DID1);
         assertEquals(DEVICE_REMOVED, event.type());
         assertDevice(DID1, SW1, event.subject());
 
         assertEquals(1, deviceStore.getDeviceCount());
         assertEquals(0, deviceStore.getPorts(DID1).size());
+        verify(clusterCommunicator);
+        // TODO: verify broadcast message
+        assertTrue(bcast.hasCaptured());
 
         // putBack Device, Port w/o annotation
         putDevice(DID1, SW1);
@@ -556,41 +798,35 @@
     private static final class TestGossipDeviceStore extends GossipDeviceStore {
 
         public TestGossipDeviceStore(
-                ClockService clockService,
+                DeviceClockService deviceClockService,
                 ClusterService clusterService,
                 ClusterCommunicationService clusterCommunicator) {
-            this.clockService = clockService;
+            this.deviceClockService = deviceClockService;
             this.clusterService = clusterService;
             this.clusterCommunicator = clusterCommunicator;
         }
-    }
 
-    private static final class TestClusterCommunicationService implements ClusterCommunicationService {
-        @Override
-        public boolean broadcast(ClusterMessage message) throws IOException { return true; }
-        @Override
-        public boolean unicast(ClusterMessage message, NodeId nodeId) throws IOException { return true; }
-        @Override
-        public boolean multicast(ClusterMessage message, Set<NodeId> nodeIds) throws IOException { return true; }
-        @Override
-        public void addSubscriber(MessageSubject subject, ClusterMessageHandler subscriber) {}
+        public <T> T deserialize(byte[] bytes) {
+            return SERIALIZER.decode(bytes);
+        }
     }
 
     private static final class TestClusterService implements ClusterService {
 
-        private static final ControllerNode ONOS1 =
-            new DefaultControllerNode(new NodeId("N1"), IpPrefix.valueOf("127.0.0.1"));
         private final Map<NodeId, ControllerNode> nodes = new HashMap<>();
         private final Map<NodeId, ControllerNode.State> nodeStates = new HashMap<>();
 
         public TestClusterService() {
-            nodes.put(new NodeId("N1"), ONOS1);
-            nodeStates.put(new NodeId("N1"), ControllerNode.State.ACTIVE);
+            nodes.put(NID1, ONOS1);
+            nodeStates.put(NID1, ACTIVE);
+
+            nodes.put(NID2, ONOS2);
+            nodeStates.put(NID2, ACTIVE);
         }
 
         @Override
         public ControllerNode getLocalNode() {
-            return ONOS1;
+            return GossipDeviceStoreTest.ONOS1;
         }
 
         @Override
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentIdTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/PortFragmentIdTest.java
similarity index 97%
rename from core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentIdTest.java
rename to core/store/dist/src/test/java/org/onlab/onos/store/device/impl/PortFragmentIdTest.java
index 97db29d..4e7c290 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/peermsg/PortFragmentIdTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/device/impl/PortFragmentIdTest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.device.impl.peermsg;
+package org.onlab.onos.store.device.impl;
 
 import static org.onlab.onos.net.DeviceId.deviceId;
 
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
similarity index 98%
rename from core/store/dist/src/test/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampTest.java
rename to core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
index ea63ef8..b455989 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.common.impl;
+package org.onlab.onos.store.impl;
 
 import static org.junit.Assert.*;
 
diff --git a/core/store/hz/cluster/src/main/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStore.java b/core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
similarity index 96%
rename from core/store/hz/cluster/src/main/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStore.java
rename to core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
index 71d42fa..e073b63 100644
--- a/core/store/hz/cluster/src/main/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStore.java
+++ b/core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
@@ -1,6 +1,6 @@
-package org.onlab.onos.store.cluster.impl;
+package org.onlab.onos.store.mastership.impl;
 
-import static org.onlab.onos.cluster.MastershipEvent.Type.MASTER_CHANGED;
+import static org.onlab.onos.mastership.MastershipEvent.Type.MASTER_CHANGED;
 
 import java.util.Map;
 import java.util.Set;
@@ -12,11 +12,11 @@
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.onos.cluster.ClusterService;
-import org.onlab.onos.cluster.MastershipEvent;
-import org.onlab.onos.cluster.MastershipStore;
-import org.onlab.onos.cluster.MastershipStoreDelegate;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipStore;
+import org.onlab.onos.mastership.MastershipStoreDelegate;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.onlab.onos.store.common.AbstractHazelcastStore;
diff --git a/core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/package-info.java b/core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/package-info.java
new file mode 100644
index 0000000..308c9ef
--- /dev/null
+++ b/core/store/hz/cluster/src/main/java/org/onlab/onos/store/mastership/impl/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Implementation of a distributed mastership store using Hazelcast.
+ */
+package org.onlab.onos.store.mastership.impl;
diff --git a/core/store/hz/cluster/src/test/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStoreTest.java b/core/store/hz/cluster/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
similarity index 97%
rename from core/store/hz/cluster/src/test/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStoreTest.java
rename to core/store/hz/cluster/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
index bf1bb38..89c4357 100644
--- a/core/store/hz/cluster/src/test/java/org/onlab/onos/store/cluster/impl/DistributedMastershipStoreTest.java
+++ b/core/store/hz/cluster/src/test/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStoreTest.java
@@ -1,4 +1,4 @@
-package org.onlab.onos.store.cluster.impl;
+package org.onlab.onos.store.mastership.impl;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
@@ -21,11 +21,11 @@
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.ControllerNode.State;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipEvent;
-import org.onlab.onos.cluster.MastershipEvent.Type;
-import org.onlab.onos.cluster.MastershipStoreDelegate;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipStoreDelegate;
+import org.onlab.onos.mastership.MastershipTerm;
+import org.onlab.onos.mastership.MastershipEvent.Type;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.store.common.StoreManager;
 import org.onlab.onos.store.common.StoreService;
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/NoOpClockProviderService.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/NoOpClockProviderService.java
index b68620a..4626fa4 100644
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/NoOpClockProviderService.java
+++ b/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/NoOpClockProviderService.java
@@ -2,17 +2,17 @@
 
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Service;
-import org.onlab.onos.cluster.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
-import org.onlab.onos.store.ClockProviderService;
+import org.onlab.onos.net.device.DeviceClockProviderService;
 
 // FIXME: Code clone in onos-core-trivial, onos-core-hz-net
 /**
- * Dummy implementation of {@link ClockProviderService}.
+ * Dummy implementation of {@link DeviceClockProviderService}.
  */
 @Component(immediate = true)
 @Service
-public class NoOpClockProviderService implements ClockProviderService {
+public class NoOpClockProviderService implements DeviceClockProviderService {
 
     @Override
     public void setMastershipTerm(DeviceId deviceId, MastershipTerm term) {
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/package-info.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/package-info.java
deleted file mode 100644
index 2fd9f27..0000000
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/device/impl/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Implementation of device store using Hazelcast distributed structures.
- */
-package org.onlab.onos.store.device.impl;
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/flow/impl/package-info.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/flow/impl/package-info.java
deleted file mode 100644
index f09ac11..0000000
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/flow/impl/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Implementation of flow store using Hazelcast distributed structures.
- */
-package org.onlab.onos.store.flow.impl;
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/host/impl/package-info.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/host/impl/package-info.java
deleted file mode 100644
index 2a9998a..0000000
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/host/impl/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Implementation of host store using Hazelcast distributed structures.
- */
-package org.onlab.onos.store.host.impl;
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/link/impl/package-info.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/link/impl/package-info.java
deleted file mode 100644
index 53b6f33..0000000
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/link/impl/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Implementation of link store using Hazelcast distributed structures.
- */
-package org.onlab.onos.store.link.impl;
diff --git a/core/store/hz/net/src/main/java/org/onlab/onos/store/topology/impl/package-info.java b/core/store/hz/net/src/main/java/org/onlab/onos/store/topology/impl/package-info.java
deleted file mode 100644
index 28b7704..0000000
--- a/core/store/hz/net/src/main/java/org/onlab/onos/store/topology/impl/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-/**
- * Implementation of topology store using Hazelcast distributed structures.
- */
-package org.onlab.onos.store.topology.impl;
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableListSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableListSerializer.java
new file mode 100644
index 0000000..4bcc0a3
--- /dev/null
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableListSerializer.java
@@ -0,0 +1,49 @@
+package org.onlab.onos.store.serializers;
+
+import org.onlab.util.KryoPool.FamilySerializer;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableList.Builder;
+
+/**
+ * Creates {@link ImmutableList} serializer instance.
+ */
+public class ImmutableListSerializer extends FamilySerializer<ImmutableList<?>> {
+
+    /**
+     * Creates {@link ImmutableList} serializer instance.
+     */
+    public ImmutableListSerializer() {
+        // non-null, immutable
+        super(false, true);
+    }
+    @Override
+    public void write(Kryo kryo, Output output, ImmutableList<?> object) {
+        output.writeInt(object.size());
+        for (Object e : object) {
+            kryo.writeClassAndObject(output, e);
+        }
+    }
+
+    @Override
+    public ImmutableList<?> read(Kryo kryo, Input input,
+            Class<ImmutableList<?>> type) {
+        final int size = input.readInt();
+        Builder<Object> builder = ImmutableList.builder();
+        for (int i = 0; i < size; ++i) {
+            builder.add(kryo.readClassAndObject(input));
+        }
+        return builder.build();
+    }
+
+    @Override
+    public void registerFamilies(Kryo kryo) {
+        kryo.register(ImmutableList.of(1).getClass(), this);
+        kryo.register(ImmutableList.of(1, 2).getClass(), this);
+        // TODO register required ImmutableList variants
+    }
+
+}
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoPoolUtil.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoPoolUtil.java
index efecb6c..b44c102 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoPoolUtil.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoPoolUtil.java
@@ -7,8 +7,8 @@
 
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.ConnectPoint;
 import org.onlab.onos.net.DefaultAnnotations;
 import org.onlab.onos.net.DefaultDevice;
@@ -31,6 +31,9 @@
 import org.onlab.packet.IpPrefix;
 import org.onlab.util.KryoPool;
 
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
 public final class KryoPoolUtil {
 
     /**
@@ -47,12 +50,15 @@
      */
     public static final KryoPool API = KryoPool.newBuilder()
             .register(MISC)
+            .register(ImmutableMap.class, new ImmutableMapSerializer())
+            .register(ImmutableList.class, new ImmutableListSerializer())
             .register(
                     //
                     ArrayList.class,
                     Arrays.asList().getClass(),
                     HashMap.class,
                     //
+                    //
                     ControllerNode.State.class,
                     Device.Type.class,
                     DefaultAnnotations.class,
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/MastershipTermSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/MastershipTermSerializer.java
index 0ac61a8..d99fcde 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/MastershipTermSerializer.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/MastershipTermSerializer.java
@@ -1,14 +1,15 @@
 package org.onlab.onos.store.serializers;
 
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipTerm;
+
 import com.esotericsoftware.kryo.Kryo;
 import com.esotericsoftware.kryo.Serializer;
 import com.esotericsoftware.kryo.io.Input;
 import com.esotericsoftware.kryo.io.Output;
 
 /**
- * Kryo Serializer for {@link org.onlab.onos.cluster.MastershipTerm}.
+ * Kryo Serializer for {@link org.onlab.onos.mastership.MastershipTerm}.
  */
 public class MastershipTermSerializer extends Serializer<MastershipTerm> {
 
diff --git a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
index d651d56..d9157b4 100644
--- a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
+++ b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
@@ -10,8 +10,8 @@
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.Annotations;
 import org.onlab.onos.net.ConnectPoint;
 import org.onlab.onos.net.DefaultAnnotations;
diff --git a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/NoOpClockProviderService.java b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/NoOpClockProviderService.java
index ff4b31a..6c1fae8 100644
--- a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/NoOpClockProviderService.java
+++ b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/NoOpClockProviderService.java
@@ -2,17 +2,17 @@
 
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Service;
-import org.onlab.onos.cluster.MastershipTerm;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
-import org.onlab.onos.store.ClockProviderService;
+import org.onlab.onos.net.device.DeviceClockProviderService;
 
 //FIXME: Code clone in onos-core-trivial, onos-core-hz-net
 /**
- * Dummy implementation of {@link ClockProviderService}.
+ * Dummy implementation of {@link DeviceClockProviderService}.
  */
 @Component(immediate = true)
 @Service
-public class NoOpClockProviderService implements ClockProviderService {
+public class NoOpClockProviderService implements DeviceClockProviderService {
 
     @Override
     public void setMastershipTerm(DeviceId deviceId, MastershipTerm term) {
diff --git a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStore.java b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStore.java
index e8096ea..aba77d0 100644
--- a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStore.java
+++ b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStore.java
@@ -15,18 +15,18 @@
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.DefaultControllerNode;
-import org.onlab.onos.cluster.MastershipEvent;
-import org.onlab.onos.cluster.MastershipStore;
-import org.onlab.onos.cluster.MastershipStoreDelegate;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipStore;
+import org.onlab.onos.mastership.MastershipStoreDelegate;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.onlab.onos.store.AbstractStore;
 import org.onlab.packet.IpPrefix;
 import org.slf4j.Logger;
 
-import static org.onlab.onos.cluster.MastershipEvent.Type.*;
+import static org.onlab.onos.mastership.MastershipEvent.Type.*;
 
 /**
  * Manages inventory of controller mastership over devices using
diff --git a/core/store/trivial/src/test/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStoreTest.java b/core/store/trivial/src/test/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStoreTest.java
index 1e8e5c7..9fa066e 100644
--- a/core/store/trivial/src/test/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStoreTest.java
+++ b/core/store/trivial/src/test/java/org/onlab/onos/store/trivial/impl/SimpleMastershipStoreTest.java
@@ -6,8 +6,8 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.onlab.onos.cluster.MastershipTerm;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.DeviceId;
 
 import com.google.common.collect.Sets;
@@ -15,8 +15,8 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
+import static org.onlab.onos.mastership.MastershipEvent.Type.*;
 import static org.onlab.onos.net.MastershipRole.*;
-import static org.onlab.onos.cluster.MastershipEvent.Type.*;
 
 /**
  * Test for the simple MastershipStore implementation.
diff --git a/pom.xml b/pom.xml
index 4290769..1b75b52 100644
--- a/pom.xml
+++ b/pom.xml
@@ -500,7 +500,7 @@
                         <group>
                             <title>Core Subsystems</title>
                             <packages>
-                                org.onlab.onos.impl:org.onlab.onos.cluster.impl:org.onlab.onos.net.device.impl:org.onlab.onos.net.link.impl:org.onlab.onos.net.host.impl:org.onlab.onos.net.topology.impl:org.onlab.onos.net.packet.impl:org.onlab.onos.net.flow.impl:org.onlab.onos.store.trivial.*:org.onlab.onos.net.*.impl:org.onlab.onos.event.impl:org.onlab.onos.store.*:org.onlab.onos.net.intent.impl:org.onlab.onos.net.proxyarp.impl
+                                org.onlab.onos.impl:org.onlab.onos.cluster.impl:org.onlab.onos.net.device.impl:org.onlab.onos.net.link.impl:org.onlab.onos.net.host.impl:org.onlab.onos.net.topology.impl:org.onlab.onos.net.packet.impl:org.onlab.onos.net.flow.impl:org.onlab.onos.store.trivial.*:org.onlab.onos.net.*.impl:org.onlab.onos.event.impl:org.onlab.onos.store.*:org.onlab.onos.net.intent.impl:org.onlab.onos.net.proxyarp.impl:org.onlab.onos.mastership.impl
                             </packages>
                         </group>
                         <group>
diff --git a/tools/test/bin/onos-update-bundle b/tools/test/bin/onos-update-bundle
new file mode 100755
index 0000000..9998ea3
--- /dev/null
+++ b/tools/test/bin/onos-update-bundle
@@ -0,0 +1,16 @@
+#!/bin/bash
+#-------------------------------------------------------------------------------
+# Update bundle on locally running karaf.
+#-------------------------------------------------------------------------------
+
+[ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
+. $ONOS_ROOT/tools/build/envDefaults
+
+cd ~/.m2/repository
+jar=$(find org/onlab -type f -name '*.jar' | grep -e $1 | grep -v -e -tests | head -n 1)
+
+[ -z "$jar" ] && echo "No bundle $1 found for" && exit 1
+
+bundle=$(echo $(basename $jar .jar) | sed 's/-[0-9].*//g')
+
+client "bundle:update -f $bundle" 2>/dev/null