diff --git a/core/api/src/main/java/org/onosproject/net/mcast/McastEvent.java b/core/api/src/main/java/org/onosproject/net/mcast/McastEvent.java
index 9cb93f2..979194c 100644
--- a/core/api/src/main/java/org/onosproject/net/mcast/McastEvent.java
+++ b/core/api/src/main/java/org/onosproject/net/mcast/McastEvent.java
@@ -21,6 +21,8 @@
 
 import java.util.Optional;
 
+import static com.google.common.base.MoreObjects.toStringHelper;
+
 /**
  * An entity representing a multicast event. Event either add or remove
  * sinks or sources.
@@ -48,11 +50,6 @@
         SOURCE_ADDED,
 
         /**
-         * A source for a mcast route (ie. the subject) has been removed.
-         */
-        SOURCE_REMOVED,
-
-        /**
          * A sink for a mcast route (ie. the subject) has been added.
          */
         SINK_ADDED,
@@ -75,15 +72,15 @@
         source = Optional.empty();
     }
 
-    protected McastEvent(McastEvent.Type type, McastRoute subject,
-                       ConnectPoint sink,
-                       ConnectPoint source) {
+    public McastEvent(McastEvent.Type type, McastRoute subject,
+                      ConnectPoint sink,
+                      ConnectPoint source) {
         super(type, subject);
         this.sink = Optional.ofNullable(sink);
         this.source = Optional.ofNullable(source);
     }
 
-    protected McastEvent(McastEvent.Type type, McastRoute subject, long time,
+    public McastEvent(McastEvent.Type type, McastRoute subject, long time,
                        ConnectPoint sink,
                        ConnectPoint source) {
         super(type, subject, time);
@@ -102,12 +99,20 @@
     }
 
     /**
-     * The source which has been removed or added. The field may not be set
-     * if the source has not been detected yet or has been removed.
+     * The source which has been removed or added.
 
      * @return an optional connect point
      */
     public Optional<ConnectPoint> source() {
         return source;
     }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("type", type())
+                .add("route", subject())
+                .add("source", source)
+                .add("sinks", sink).toString();
+    }
 }
diff --git a/core/api/src/main/java/org/onosproject/net/mcast/McastRoute.java b/core/api/src/main/java/org/onosproject/net/mcast/McastRoute.java
index 47ab12b..ff1292b 100644
--- a/core/api/src/main/java/org/onosproject/net/mcast/McastRoute.java
+++ b/core/api/src/main/java/org/onosproject/net/mcast/McastRoute.java
@@ -20,6 +20,7 @@
 import org.onlab.packet.IpPrefix;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * An entity representing a multicast route consisting of a source
@@ -50,6 +51,9 @@
     private final Type type;
 
     public McastRoute(IpPrefix source, IpPrefix group, Type type) {
+        checkNotNull(source, "Multicast route must have a source");
+        checkNotNull(group, "Multicast route must specify a group address");
+        checkNotNull(type, "Must indicate what type of route");
         this.source = source;
         this.group = group;
         this.type = type;
diff --git a/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteTable.java b/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
similarity index 89%
rename from core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteTable.java
rename to core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
index a5e8d30..56e87c5 100644
--- a/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteTable.java
+++ b/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
@@ -24,7 +24,7 @@
  * A service interface for maintaining multicast information.
  */
 @Beta
-public interface MulticastRouteTable {
+public interface MulticastRouteService {
 
     /**
      * Adds a route to the information base.
@@ -59,14 +59,6 @@
     void addSink(McastRoute route, ConnectPoint connectPoint);
 
     /**
-     * Removes a source connection from the route.
-     *
-     * @param route the multicast route
-     * @param connectPoint a source connect point
-     */
-    void removeSource(McastRoute route, ConnectPoint connectPoint);
-
-    /**
      * Removes a sink from the route.
      *
      * @param route the multicast route
diff --git a/core/api/src/main/java/org/onosproject/net/mcast/package-info.java b/core/api/src/main/java/org/onosproject/net/mcast/package-info.java
new file mode 100644
index 0000000..e8dcc7b
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/mcast/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * External model entities of the multicast RIB.
+ */
+package org.onosproject.net.mcast;
\ No newline at end of file
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastData.java b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastData.java
new file mode 100644
index 0000000..1fb673e
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastData.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.incubator.net.mcast.impl;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import org.onosproject.net.ConnectPoint;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Simple entity maintaining a mapping between a source and a collection of sink
+ * connect points.
+ */
+public final class MulticastData {
+
+    private final ConnectPoint source;
+    private final List<ConnectPoint> sinks;
+
+    private MulticastData() {
+        this.source = null;
+        this.sinks = Collections.EMPTY_LIST;
+    }
+
+    public MulticastData(ConnectPoint source, List<ConnectPoint> sinks) {
+        this.source = source;
+        this.sinks = sinks;
+    }
+
+    public MulticastData(ConnectPoint source, ConnectPoint sink) {
+        this.source = source;
+        this.sinks = Lists.newArrayList(sink);
+    }
+
+    public MulticastData(ConnectPoint source) {
+        this.source = source;
+        this.sinks = Lists.newArrayList();
+    }
+
+    public ConnectPoint source() {
+        return source;
+    }
+
+    public List<ConnectPoint> sinks() {
+        return ImmutableList.copyOf(sinks);
+    }
+
+    public void appendSink(ConnectPoint sink) {
+        sinks.add(sink);
+    }
+
+    public boolean removeSink(ConnectPoint sink) {
+        return sinks.remove(sink);
+    }
+
+    public boolean isEmpty() {
+        return source == null && sinks.size() == 0;
+    }
+
+    public static MulticastData empty() {
+        return new MulticastData();
+    }
+
+}
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManager.java
new file mode 100644
index 0000000..713383f
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManager.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.incubator.net.mcast.impl;
+
+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.apache.felix.scr.annotations.Service;
+import org.onlab.packet.IpPrefix;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.event.AbstractListenerManager;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.mcast.McastEvent;
+import org.onosproject.net.mcast.McastListener;
+import org.onosproject.net.mcast.McastRoute;
+import org.onosproject.net.mcast.MulticastRouteService;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.slf4j.Logger;
+
+import java.util.List;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * An implementation of a multicast route table.
+ */
+@Component(immediate = true)
+@Service
+public class MulticastRouteManager
+        extends AbstractListenerManager<McastEvent, McastListener>
+        implements MulticastRouteService {
+    //TODO: add MulticastRouteAdminService
+
+    private static final String MCASTRIB = "mcast-rib-table";
+
+    private Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private StorageService storageService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private CoreService coreService;
+
+
+    protected ApplicationId appId;
+    protected ConsistentMap<McastRoute, MulticastData> mcastRoutes;
+
+    @Activate
+    public void activate() {
+
+        eventDispatcher.addSink(McastEvent.class, listenerRegistry);
+
+        appId = coreService.registerApplication("org.onosproject.mcastrib");
+
+        mcastRoutes = storageService.<McastRoute, MulticastData>consistentMapBuilder()
+                .withApplicationId(appId)
+                .withName(MCASTRIB)
+                .withSerializer(Serializer.using(KryoNamespace.newBuilder().register(
+                        MulticastData.class,
+                        McastRoute.class,
+                        McastRoute.Type.class,
+                        IpPrefix.class,
+                        List.class,
+                        ConnectPoint.class
+                ).build())).build();
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Stopped");
+    }
+
+    @Override
+    public void add(McastRoute route) {
+        mcastRoutes.put(route, MulticastData.empty());
+        post(new McastEvent(McastEvent.Type.ROUTE_ADDED, route, null, null));
+    }
+
+    @Override
+    public void remove(McastRoute route) {
+        mcastRoutes.remove(route);
+        post(new McastEvent(McastEvent.Type.ROUTE_REMOVED, route, null, null));
+    }
+
+    @Override
+    public void addSource(McastRoute route, ConnectPoint connectPoint) {
+        Versioned<MulticastData> d = mcastRoutes.compute(route, (k, v) -> {
+            if (v.isEmpty()) {
+                return new MulticastData(connectPoint);
+            } else {
+                log.warn("Route {} is already in use.", route);
+                return v;
+            }
+        });
+
+        if (d != null) {
+            post(new McastEvent(McastEvent.Type.SOURCE_ADDED,
+                                route, null, connectPoint));
+        }
+    }
+
+    @Override
+    public void addSink(McastRoute route, ConnectPoint connectPoint) {
+         mcastRoutes.compute(route, (k, v) -> {
+            if (!v.isEmpty()) {
+                v.appendSink(connectPoint);
+                post(new McastEvent(McastEvent.Type.SINK_ADDED, route,
+                                    connectPoint, v.source()));
+            } else {
+                log.warn("Route {} does not exist");
+            }
+            return v;
+        });
+    }
+
+
+    @Override
+    public void removeSink(McastRoute route, ConnectPoint connectPoint) {
+        mcastRoutes.compute(route, (k, v) -> {
+            if (v.removeSink(connectPoint)) {
+                post(new McastEvent(McastEvent.Type.SINK_REMOVED, route,
+                                    connectPoint, v.source()));
+            }
+            return v;
+        });
+    }
+
+    @Override
+    public ConnectPoint fetchSource(McastRoute route) {
+        MulticastData d = mcastRoutes.asJavaMap().getOrDefault(route,
+                                                               MulticastData.empty());
+        return d.source();
+    }
+
+    @Override
+    public List<ConnectPoint> fetchSinks(McastRoute route) {
+        MulticastData d = mcastRoutes.asJavaMap().getOrDefault(route,
+                                                               MulticastData.empty());
+        return d.sinks();
+    }
+}
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/package-info.java b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/package-info.java
new file mode 100644
index 0000000..464cf70
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/mcast/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * An implementation of a multicast RIB.
+ */
+package org.onosproject.incubator.net.mcast.impl;
\ No newline at end of file
diff --git a/incubator/net/src/test/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManagerTest.java b/incubator/net/src/test/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManagerTest.java
new file mode 100644
index 0000000..545e21d
--- /dev/null
+++ b/incubator/net/src/test/java/org/onosproject/incubator/net/mcast/impl/MulticastRouteManagerTest.java
@@ -0,0 +1,200 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.incubator.net.mcast.impl;
+
+import com.google.common.collect.Lists;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onlab.packet.IpPrefix;
+import org.onosproject.common.event.impl.TestEventDispatcher;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.core.IdGenerator;
+import org.onosproject.core.Version;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.mcast.McastEvent;
+import org.onosproject.net.mcast.McastListener;
+import org.onosproject.net.mcast.McastRoute;
+import org.onosproject.store.service.TestStorageService;
+
+import java.util.List;
+import java.util.Set;
+
+import static junit.framework.Assert.fail;
+import static junit.framework.TestCase.assertEquals;
+import static org.onosproject.net.NetTestTools.did;
+import static org.onosproject.net.NetTestTools.injectEventDispatcher;
+
+/**
+ * Tests for the multicast RIB.
+ */
+public class MulticastRouteManagerTest {
+
+    McastRoute r1 = new McastRoute(IpPrefix.valueOf("1.1.1.1/8"),
+                                          IpPrefix.valueOf("1.1.1.2/8"),
+                                          McastRoute.Type.IGMP);
+
+    McastRoute r11 = new McastRoute(IpPrefix.valueOf("1.1.1.1/8"),
+                                          IpPrefix.valueOf("1.1.1.2/8"),
+                                          McastRoute.Type.STATIC);
+
+    McastRoute r2 = new McastRoute(IpPrefix.valueOf("2.2.2.1/8"),
+                                          IpPrefix.valueOf("2.2.2.2/8"),
+                                          McastRoute.Type.PIM);
+
+    ConnectPoint cp1 = new ConnectPoint(did("1"), PortNumber.portNumber(1));
+
+    ConnectPoint cp2 = new ConnectPoint(did("2"), PortNumber.portNumber(2));
+
+    private TestMulticastListener listener = new TestMulticastListener();
+
+    private MulticastRouteManager manager;
+
+    private List<McastEvent> events;
+
+    @Before
+    public void setUp() throws Exception {
+        manager = new MulticastRouteManager();
+        injectEventDispatcher(manager, new TestEventDispatcher());
+        TestUtils.setField(manager, "storageService", new TestStorageService());
+        TestUtils.setField(manager, "coreService", new TestCoreService());
+        events  = Lists.newArrayList();
+        manager.activate();
+        manager.addListener(listener);
+    }
+
+    @After
+    public void tearDown() {
+        manager.removeListener(listener);
+        manager.deactivate();
+    }
+
+    @Test
+    public void testAdd() {
+        manager.add(r1);
+
+        assertEquals("Add failed", manager.mcastRoutes.size(), 1);
+        validateEvents(McastEvent.Type.ROUTE_ADDED);
+    }
+
+    @Test
+    public void testRemove() {
+        manager.add(r1);
+
+        manager.remove(r1);
+
+        assertEquals("Remove failed", manager.mcastRoutes.size(), 0);
+        validateEvents(McastEvent.Type.ROUTE_ADDED, McastEvent.Type.ROUTE_REMOVED);
+    }
+
+    @Test
+    public void testAddSource() {
+        manager.add(r1);
+
+        manager.addSource(r1, cp1);
+
+        validateEvents(McastEvent.Type.ROUTE_ADDED, McastEvent.Type.SOURCE_ADDED);
+        assertEquals("Route is not equal", cp1, manager.fetchSource(r1));
+    }
+
+    @Test
+    public void testAddSink() {
+        manager.add(r1);
+
+        manager.addSource(r1, cp1);
+        manager.addSink(r1, cp1);
+
+        validateEvents(McastEvent.Type.ROUTE_ADDED,
+                       McastEvent.Type.SOURCE_ADDED,
+                       McastEvent.Type.SINK_ADDED);
+        assertEquals("Route is not equal", Lists.newArrayList(cp1), manager.fetchSinks(r1));
+    }
+
+    @Test
+    public void testRemoveSink() {
+        manager.add(r1);
+
+        manager.addSource(r1, cp1);
+        manager.addSink(r1, cp1);
+        manager.addSink(r1, cp2);
+        manager.removeSink(r1, cp2);
+
+        validateEvents(McastEvent.Type.ROUTE_ADDED,
+                       McastEvent.Type.SOURCE_ADDED,
+                       McastEvent.Type.SINK_ADDED,
+                       McastEvent.Type.SINK_ADDED,
+                       McastEvent.Type.SINK_REMOVED);
+        assertEquals("Route is not equal", Lists.newArrayList(cp1), manager.fetchSinks(r1));
+    }
+
+    private void validateEvents(McastEvent.Type... evs) {
+        if (events.size() != evs.length) {
+            fail(String.format("Mismatch number of events# obtained -> %s : expected %s",
+                               events, evs));
+        }
+
+        for (int i = 0; i < evs.length; i++) {
+            if (evs[i] != events.get(i).type()) {
+                fail(String.format("Mismtached events# obtained -> %s : expected %s",
+                                   events, evs));
+            }
+        }
+    }
+
+    class TestMulticastListener implements McastListener {
+
+        @Override
+        public void event(McastEvent event) {
+            events.add(event);
+        }
+    }
+
+    private class TestCoreService implements CoreService {
+        @Override
+        public Version version() {
+            return null;
+        }
+
+        @Override
+        public Set<ApplicationId> getAppIds() {
+            return null;
+        }
+
+        @Override
+        public ApplicationId getAppId(Short id) {
+            return null;
+        }
+
+        @Override
+        public ApplicationId getAppId(String name) {
+            return null;
+        }
+
+        @Override
+        public ApplicationId registerApplication(String identifier) {
+            return new DefaultApplicationId(0, identifier);
+        }
+
+        @Override
+        public IdGenerator getIdGenerator(String topic) {
+            return null;
+        }
+    }
+}