diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/McastEventHandler.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/McastEventHandler.java
new file mode 100644
index 0000000..928116a2
--- /dev/null
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/McastEventHandler.java
@@ -0,0 +1,503 @@
+/*
+ * Copyright 2016-present 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.segmentrouting;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.incubator.net.config.basics.McastConfig;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.Path;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.DefaultTrafficSelector;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.flow.criteria.Criteria;
+import org.onosproject.net.flow.instructions.Instructions.OutputInstruction;
+import org.onosproject.net.flowobjective.DefaultFilteringObjective;
+import org.onosproject.net.flowobjective.DefaultForwardingObjective;
+import org.onosproject.net.flowobjective.DefaultNextObjective;
+import org.onosproject.net.flowobjective.FilteringObjective;
+import org.onosproject.net.flowobjective.ForwardingObjective;
+import org.onosproject.net.flowobjective.NextObjective;
+import org.onosproject.net.mcast.McastEvent;
+import org.onosproject.net.mcast.McastRouteInfo;
+import org.onosproject.net.topology.TopologyService;
+import org.onosproject.segmentrouting.grouphandler.McastNextObjectiveStoreKey;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+
+/**
+ * Multicast event handler.
+ */
+public class McastEventHandler {
+    private static final Logger log = LoggerFactory.getLogger(McastEventHandler.class);
+    private final SegmentRoutingManager srManager;
+    private final ApplicationId coreAppId;
+    private StorageService storageService;
+    private TopologyService topologyService;
+    private final KryoNamespace.Builder kryoBuilder;
+    private final ConsistentMap<McastNextObjectiveStoreKey, NextObjective> mcastNextObjStore;
+
+    /**
+     * Constructs the McastEventHandler.
+     *
+     * @param srManager Segment Routing manager
+     */
+    public McastEventHandler(SegmentRoutingManager srManager) {
+        coreAppId = srManager.coreService.getAppId(CoreService.CORE_APP_NAME);
+
+        this.srManager = srManager;
+        this.storageService = srManager.storageService;
+        this.topologyService = srManager.topologyService;
+
+        kryoBuilder = new KryoNamespace.Builder()
+                .register(KryoNamespaces.API)
+                .register(McastNextObjectiveStoreKey.class);
+        mcastNextObjStore = storageService
+                .<McastNextObjectiveStoreKey, NextObjective>consistentMapBuilder()
+                .withName("onos-mcast-nextobj-store")
+                .withSerializer(Serializer.using(kryoBuilder.build()))
+                .build();
+    }
+
+    /**
+     * Processes the SOURCE_ADDED event.
+     *
+     * @param event McastEvent with SOURCE_ADDED type
+     */
+    protected void processSourceAdded(McastEvent event) {
+        log.info("processSourceAdded {}", event);
+        McastRouteInfo mcastRouteInfo = event.subject();
+        if (!mcastRouteInfo.isComplete()) {
+            log.info("Incompleted McastRouteInfo. Abort.");
+            return;
+        }
+        ConnectPoint source = mcastRouteInfo.source().orElse(null);
+        Set<ConnectPoint> sinks = mcastRouteInfo.sinks();
+        IpAddress mcastIp = mcastRouteInfo.route().group();
+
+        sinks.forEach(sink -> {
+            processSinkAddedInternal(source, sink, mcastIp);
+        });
+    }
+
+    /**
+     * Processes the SINK_ADDED event.
+     *
+     * @param event McastEvent with SINK_ADDED type
+     */
+    protected void processSinkAdded(McastEvent event) {
+        log.info("processSinkAdded {}", event);
+        McastRouteInfo mcastRouteInfo = event.subject();
+        if (!mcastRouteInfo.isComplete()) {
+            log.info("Incompleted McastRouteInfo. Abort.");
+            return;
+        }
+        ConnectPoint source = mcastRouteInfo.source().orElse(null);
+        ConnectPoint sink = mcastRouteInfo.sink().orElse(null);
+        IpAddress mcastIp = mcastRouteInfo.route().group();
+
+        processSinkAddedInternal(source, sink, mcastIp);
+    }
+
+    /**
+     * Processes the SINK_REMOVED event.
+     *
+     * @param event McastEvent with SINK_REMOVED type
+     */
+    protected void processSinkRemoved(McastEvent event) {
+        log.info("processSinkRemoved {}", event);
+        McastRouteInfo mcastRouteInfo = event.subject();
+        if (!mcastRouteInfo.isComplete()) {
+            log.info("Incompleted McastRouteInfo. Abort.");
+            return;
+        }
+        ConnectPoint source = mcastRouteInfo.source().orElse(null);
+        ConnectPoint sink = mcastRouteInfo.sink().orElse(null);
+        IpAddress mcastIp = mcastRouteInfo.route().group();
+        VlanId assignedVlan = assignedVlan();
+
+        // When source and sink are on the same device
+        if (source.deviceId().equals(sink.deviceId())) {
+            // Source and sink are on even the same port. There must be something wrong.
+            if (source.port().equals(sink.port())) {
+                log.warn("Sink is on the same port of source. Abort");
+                return;
+            }
+            removePortFromDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan);
+            return;
+        }
+
+        // Process the egress device
+        boolean isLast = removePortFromDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan);
+
+        // If this is the last sink on the device, also update upstream
+        Optional<Path> mcastPath = getPath(source.deviceId(), sink.deviceId(), mcastIp);
+        if (mcastPath.isPresent()) {
+            List<Link> links = Lists.newArrayList(mcastPath.get().links());
+            Collections.reverse(links);
+            for (Link link : links) {
+                if (isLast) {
+                    isLast = removePortFromDevice(link.src().deviceId(), link.src().port(),
+                            mcastIp, assignedVlan);
+                }
+            }
+        }
+    }
+
+    /**
+     * Establishes a path from source to sink for given multicast group.
+     *
+     * @param source connect point of the multicast source
+     * @param sink connection point of the multicast sink
+     * @param mcastIp multicast group IP address
+     */
+    private void processSinkAddedInternal(ConnectPoint source, ConnectPoint sink,
+            IpAddress mcastIp) {
+        VlanId assignedVlan = assignedVlan();
+
+        // When source and sink are on the same device
+        if (source.deviceId().equals(sink.deviceId())) {
+            // Source and sink are on even the same port. There must be something wrong.
+            if (source.port().equals(sink.port())) {
+                log.warn("Sink is on the same port of source. Abort");
+                return;
+            }
+            addPortToDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan);
+            return;
+        }
+
+        // Process the ingress device
+        addFilterToDevice(source.deviceId(), source.port(), assignedVlan);
+
+        // Find a path. If present, create/update groups and flows for each hop
+        Optional<Path> mcastPath = getPath(source.deviceId(), sink.deviceId(), mcastIp);
+        if (mcastPath.isPresent()) {
+            mcastPath.get().links().forEach(link -> {
+                addFilterToDevice(link.dst().deviceId(), link.dst().port(), assignedVlan);
+                addPortToDevice(link.src().deviceId(), link.src().port(), mcastIp, assignedVlan);
+            });
+            // Process the egress device
+            addPortToDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan);
+        }
+    }
+
+    /**
+     * Adds filtering objective for given device and port.
+     *
+     * @param deviceId device ID
+     * @param port ingress port number
+     * @param assignedVlan assigned VLAN ID
+     */
+    private void addFilterToDevice(DeviceId deviceId, PortNumber port, VlanId assignedVlan) {
+        // Do nothing if the port is configured as suppressed
+        ConnectPoint connectPt = new ConnectPoint(deviceId, port);
+        if (srManager.deviceConfiguration.suppressSubnet().contains(connectPt) ||
+                srManager.deviceConfiguration.suppressHost().contains(connectPt)) {
+            log.info("Ignore suppressed port {}", connectPt);
+            return;
+        }
+
+        FilteringObjective.Builder filtObjBuilder =
+                filterObjBuilder(deviceId, port, assignedVlan);
+        srManager.flowObjectiveService.filter(deviceId, filtObjBuilder.add());
+        // TODO add objective context
+    }
+
+    /**
+     * Adds a port to given multicast group on given device. This involves the
+     * update of L3 multicast group and multicast routing table entry.
+     *
+     * @param deviceId device ID
+     * @param port port to be added
+     * @param mcastIp multicast group
+     * @param assignedVlan assigned VLAN ID
+     */
+    private void addPortToDevice(DeviceId deviceId, PortNumber port,
+            IpAddress mcastIp, VlanId assignedVlan) {
+        log.info("Add port {} to {}. mcastIp={}, assignedVlan={}",
+                port, deviceId, mcastIp, assignedVlan);
+        McastNextObjectiveStoreKey mcastNextObjectiveStoreKey =
+                new McastNextObjectiveStoreKey(mcastIp, deviceId);
+        ImmutableSet.Builder<PortNumber> portBuilder = ImmutableSet.builder();
+        if (!mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) {
+            // First time someone request this mcast group via this device
+            portBuilder.add(port);
+        } else {
+            // This device already serves some subscribers of this mcast group
+            NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value();
+            // Stop if the port is already in the nextobj
+            Set<PortNumber> existingPorts = getPorts(nextObj.next());
+            if (existingPorts.contains(port)) {
+                log.info("NextObj for {}/{} already exists. Abort", deviceId, port);
+                return;
+            }
+            portBuilder.addAll(existingPorts).add(port).build();
+        }
+        // Create, store and apply the new nextObj and fwdObj
+        NextObjective newNextObj =
+                nextObjBuilder(mcastIp, assignedVlan, portBuilder.build()).add();
+        ForwardingObjective fwdObj =
+                fwdObjBuilder(mcastIp, assignedVlan, newNextObj.id()).add();
+        mcastNextObjStore.put(mcastNextObjectiveStoreKey, newNextObj);
+        srManager.flowObjectiveService.next(deviceId, newNextObj);
+        srManager.flowObjectiveService.forward(deviceId, fwdObj);
+        // TODO add objective callback
+    }
+
+    /**
+     * Removes a port from given multicast group on given device.
+     * This involves the update of L3 multicast group and multicast routing
+     * table entry.
+     *
+     * @param deviceId device ID
+     * @param port port to be added
+     * @param mcastIp multicast group
+     * @param assignedVlan assigned VLAN ID
+     * @return true if this is the last sink on this device
+     */
+    private boolean removePortFromDevice(DeviceId deviceId, PortNumber port,
+            IpAddress mcastIp, VlanId assignedVlan) {
+        log.info("Remove port {} from {}. mcastIp={}, assignedVlan={}",
+                port, deviceId, mcastIp, assignedVlan);
+        McastNextObjectiveStoreKey mcastNextObjectiveStoreKey =
+                new McastNextObjectiveStoreKey(mcastIp, deviceId);
+        // This device is not serving this multicast group
+        if (!mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) {
+            log.warn("{} is not serving {} on port {}. Abort.", deviceId, mcastIp, port);
+            return false;
+        }
+        NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value();
+
+        Set<PortNumber> existingPorts = getPorts(nextObj.next());
+        // This device does not serve this multicast group
+        if (!existingPorts.contains(port)) {
+            log.warn("{} is not serving {} on port {}. Abort.", deviceId, mcastIp, port);
+            return false;
+        }
+        // Copy and modify the ImmutableSet
+        existingPorts = Sets.newHashSet(existingPorts);
+        existingPorts.remove(port);
+
+        NextObjective newNextObj;
+        ForwardingObjective fwdObj;
+        if (existingPorts.isEmpty()) {
+            // If this is the last sink, remove flows and groups
+            // NOTE: Rely on GroupStore garbage collection rather than explicitly
+            //       remove L3MG since there might be other flows/groups refer to
+            //       the same L2IG
+            fwdObj = fwdObjBuilder(mcastIp, assignedVlan, nextObj.id()).remove();
+            mcastNextObjStore.remove(mcastNextObjectiveStoreKey);
+            srManager.flowObjectiveService.forward(deviceId, fwdObj);
+        } else {
+            // If this is not the last sink, update flows and groups
+            newNextObj = nextObjBuilder(mcastIp, assignedVlan, existingPorts).add();
+            fwdObj = fwdObjBuilder(mcastIp, assignedVlan, newNextObj.id()).add();
+            mcastNextObjStore.put(mcastNextObjectiveStoreKey, newNextObj);
+            srManager.flowObjectiveService.next(deviceId, newNextObj);
+            srManager.flowObjectiveService.forward(deviceId, fwdObj);
+        }
+        // TODO add objective callback
+
+        return existingPorts.isEmpty();
+    }
+
+    /**
+     * Creates a next objective builder for multicast.
+     *
+     * @param mcastIp multicast group
+     * @param assignedVlan assigned VLAN ID
+     * @param outPorts set of output port numbers
+     * @return next objective builder
+     */
+    private NextObjective.Builder nextObjBuilder(IpAddress mcastIp,
+            VlanId assignedVlan, Set<PortNumber> outPorts) {
+        int nextId = srManager.flowObjectiveService.allocateNextId();
+
+        TrafficSelector metadata =
+                DefaultTrafficSelector.builder()
+                        .matchVlanId(assignedVlan)
+                        .matchIPDst(mcastIp.toIpPrefix())
+                        .build();
+
+        NextObjective.Builder nextObjBuilder = DefaultNextObjective
+                .builder().withId(nextId)
+                .withType(NextObjective.Type.BROADCAST).fromApp(srManager.appId)
+                .withMeta(metadata);
+
+        outPorts.forEach(port -> {
+            TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+            if (egressVlan().equals(VlanId.NONE)) {
+                tBuilder.popVlan();
+            }
+            tBuilder.setOutput(port);
+            nextObjBuilder.addTreatment(tBuilder.build());
+        });
+
+        return nextObjBuilder;
+    }
+
+    /**
+     * Creates a forwarding objective builder for multicast.
+     *
+     * @param mcastIp multicast group
+     * @param assignedVlan assigned VLAN ID
+     * @param nextId next ID of the L3 multicast group
+     * @return forwarding objective builder
+     */
+    private ForwardingObjective.Builder fwdObjBuilder(IpAddress mcastIp,
+            VlanId assignedVlan, int nextId) {
+        TrafficSelector.Builder sbuilder = DefaultTrafficSelector.builder();
+        IpPrefix mcastPrefix = IpPrefix.valueOf(mcastIp, IpPrefix.MAX_INET_MASK_LENGTH);
+        sbuilder.matchEthType(Ethernet.TYPE_IPV4);
+        sbuilder.matchIPDst(mcastPrefix);
+        TrafficSelector.Builder metabuilder = DefaultTrafficSelector.builder();
+        metabuilder.matchVlanId(assignedVlan);
+
+        ForwardingObjective.Builder fwdBuilder = DefaultForwardingObjective.builder();
+        fwdBuilder.withSelector(sbuilder.build())
+                .withMeta(metabuilder.build())
+                .nextStep(nextId)
+                .withFlag(ForwardingObjective.Flag.SPECIFIC)
+                .fromApp(srManager.appId)
+                .withPriority(SegmentRoutingService.DEFAULT_PRIORITY);
+        return fwdBuilder;
+    }
+
+    /**
+     * Creates a filtering objective builder for multicast.
+     *
+     * @param deviceId Device ID
+     * @param ingressPort ingress port of the multicast stream
+     * @param assignedVlan assigned VLAN ID
+     * @return filtering objective builder
+     */
+    private FilteringObjective.Builder filterObjBuilder(DeviceId deviceId, PortNumber ingressPort,
+            VlanId assignedVlan) {
+        FilteringObjective.Builder filtBuilder = DefaultFilteringObjective.builder();
+        filtBuilder.withKey(Criteria.matchInPort(ingressPort))
+                .addCondition(Criteria.matchEthDstMasked(MacAddress.IPV4_MULTICAST,
+                        MacAddress.IPV4_MULTICAST_MASK))
+                .addCondition(Criteria.matchVlanId(egressVlan()))
+                .withPriority(SegmentRoutingService.DEFAULT_PRIORITY);
+        // vlan assignment is valid only if this instance is master
+        if (srManager.mastershipService.isLocalMaster(deviceId)) {
+            TrafficTreatment tt = DefaultTrafficTreatment.builder()
+                    .pushVlan().setVlanId(assignedVlan).build();
+            filtBuilder.withMeta(tt);
+        }
+        return filtBuilder.permit().fromApp(srManager.appId);
+    }
+
+    /**
+     * Gets output ports information from treatments.
+     *
+     * @param treatments collection of traffic treatments
+     * @return set of output port numbers
+     */
+    private Set<PortNumber> getPorts(Collection<TrafficTreatment> treatments) {
+        ImmutableSet.Builder<PortNumber> builder = ImmutableSet.builder();
+        treatments.forEach(treatment -> {
+            treatment.allInstructions().stream()
+                    .filter(instr -> instr instanceof OutputInstruction)
+                    .forEach(instr -> {
+                        builder.add(((OutputInstruction) instr).port());
+                    });
+        });
+        return builder.build();
+    }
+
+    /**
+     * Gets a path from src to dst.
+     * If a path was allocated before, returns the allocated path.
+     * Otherwise, randomly pick one from available paths.
+     *
+     * @param src source device ID
+     * @param dst destination device ID
+     * @param mcastIp multicast group
+     * @return an optional path from src to dst
+     */
+    private Optional<Path> getPath(DeviceId src, DeviceId dst, IpAddress mcastIp) {
+        List<Path> allPaths = Lists.newArrayList(
+                topologyService.getPaths(topologyService.currentTopology(), src, dst));
+        if (allPaths.isEmpty()) {
+            log.warn("Fail to find a path from {} to {}. Abort.", src, dst);
+            return Optional.empty();
+        }
+
+        // If one of the available path is used before, use the same path
+        McastNextObjectiveStoreKey mcastNextObjectiveStoreKey =
+                new McastNextObjectiveStoreKey(mcastIp, src);
+        if (mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) {
+            NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value();
+            Set<PortNumber> existingPorts = getPorts(nextObj.next());
+            for (Path path : allPaths) {
+                PortNumber srcPort = path.links().get(0).src().port();
+                if (existingPorts.contains(srcPort)) {
+                    return Optional.of(path);
+                }
+            }
+        }
+        // Otherwise, randomly pick a path
+        Collections.shuffle(allPaths);
+        return allPaths.stream().findFirst();
+    }
+
+    /**
+     * Gets egress VLAN from McastConfig.
+     *
+     * @return egress VLAN or VlanId.NONE if not configured
+     */
+    private VlanId egressVlan() {
+        McastConfig mcastConfig =
+                srManager.cfgService.getConfig(coreAppId, McastConfig.class);
+        return (mcastConfig != null) ? mcastConfig.egressVlan() : VlanId.NONE;
+    }
+
+    /**
+     * Gets assigned VLAN according to the value of egress VLAN.
+     *
+     * @return assigned VLAN
+     */
+    private VlanId assignedVlan() {
+        return (egressVlan().equals(VlanId.NONE)) ?
+                VlanId.vlanId(SegmentRoutingManager.ASSIGNED_VLAN_NO_SUBNET) :
+                egressVlan();
+    }
+}