diff --git a/core/net/src/main/java/org/onosproject/net/tunnel/impl/TunnelManager.java b/core/net/src/main/java/org/onosproject/net/tunnel/impl/TunnelManager.java
index 563651c..47e5311 100644
--- a/core/net/src/main/java/org/onosproject/net/tunnel/impl/TunnelManager.java
+++ b/core/net/src/main/java/org/onosproject/net/tunnel/impl/TunnelManager.java
@@ -15,11 +15,11 @@
  */
 package org.onosproject.net.tunnel.impl;
 
+import static com.google.common.base.Preconditions.checkNotNull;
 import static org.slf4j.LoggerFactory.getLogger;
 
 import java.util.Collection;
 import java.util.Set;
-import java.util.concurrent.ExecutorService;
 
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
@@ -28,16 +28,14 @@
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
 import org.onosproject.core.ApplicationId;
-import org.onosproject.core.CoreService;
 import org.onosproject.event.EventDeliveryService;
 import org.onosproject.event.ListenerRegistry;
 import org.onosproject.net.Annotations;
 import org.onosproject.net.Path;
-import org.onosproject.net.link.LinkEvent;
-import org.onosproject.net.link.LinkListener;
 import org.onosproject.net.provider.AbstractProviderRegistry;
 import org.onosproject.net.provider.AbstractProviderService;
 import org.onosproject.net.provider.ProviderId;
+import org.onosproject.net.tunnel.DefaultTunnel;
 import org.onosproject.net.tunnel.Tunnel;
 import org.onosproject.net.tunnel.Tunnel.Type;
 import org.onosproject.net.tunnel.TunnelAdminService;
@@ -73,8 +71,7 @@
             listenerRegistry = new ListenerRegistry<>();
 
     private final TunnelStoreDelegate delegate = new InternalStoreDelegate();
-    private final InternalTunnelListener tunnelListener = new InternalTunnelListener();
-    private InternalLinkListener linkListener = new InternalLinkListener();
+
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected TunnelStore store;
@@ -82,73 +79,221 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected EventDeliveryService eventDispatcher;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected CoreService coreService;
-
-    private ExecutorService futureService;
-
     @Activate
     public void activate() {
-        // TODO Auto-generated method stub
+        store.setDelegate(delegate);
+        eventDispatcher.addSink(TunnelEvent.class, listenerRegistry);
         log.info("Started");
     }
 
     @Deactivate
     public void deactivate() {
-        // TODO Auto-generated method stub
+        store.unsetDelegate(delegate);
+        eventDispatcher.removeSink(TunnelEvent.class);
         log.info("Stopped");
     }
 
     @Override
+    public void removeTunnel(TunnelId tunnelId) {
+        checkNotNull(tunnelId, TUNNNEL_ID_NULL);
+        store.deleteTunnel(tunnelId);
+        Tunnel tunnel = store.queryTunnel(tunnelId);
+        if (tunnel.providerId() != null) {
+            TunnelProvider provider = getProvider(tunnel.providerId());
+            if (provider != null) {
+                provider.releaseTunnel(tunnel);
+            }
+        } else {
+            Set<ProviderId> ids = getProviders();
+            for (ProviderId providerId : ids) {
+                TunnelProvider provider = getProvider(providerId);
+                provider.releaseTunnel(tunnel);
+            }
+        }
+    }
+
+    @Override
+    public void updateTunnel(Tunnel tunnel, Path path) {
+        store.createOrUpdateTunnel(tunnel);
+        if (tunnel.providerId() != null) {
+            TunnelProvider provider = getProvider(tunnel.providerId());
+            if (provider != null) {
+                provider.updateTunnel(tunnel, path);
+            }
+        } else {
+            Set<ProviderId> ids = getProviders();
+            for (ProviderId providerId : ids) {
+                TunnelProvider provider = getProvider(providerId);
+                provider.updateTunnel(tunnel, path);
+            }
+        }
+    }
+
+    @Override
+    public void removeTunnels(TunnelEndPoint src, TunnelEndPoint dst,
+                              ProviderId producerName) {
+        store.deleteTunnel(src, dst, producerName);
+        Collection<Tunnel> setTunnels = store.queryTunnel(src, dst);
+        for (Tunnel tunnel : setTunnels) {
+            if (producerName != null
+                    && !tunnel.providerId().equals(producerName)) {
+                continue;
+            }
+            if (tunnel.providerId() != null) {
+                TunnelProvider provider = getProvider(tunnel.providerId());
+                if (provider != null) {
+                    provider.releaseTunnel(tunnel);
+                }
+            } else {
+                Set<ProviderId> ids = getProviders();
+                for (ProviderId providerId : ids) {
+                    TunnelProvider provider = getProvider(providerId);
+                    provider.releaseTunnel(tunnel);
+                }
+            }
+        }
+    }
+
+    @Override
+    public void removeTunnels(TunnelEndPoint src, TunnelEndPoint dst, Type type,
+                              ProviderId producerName) {
+        store.deleteTunnel(src, dst, type, producerName);
+        Collection<Tunnel> setTunnels = store.queryTunnel(src, dst);
+        for (Tunnel tunnel : setTunnels) {
+            if (producerName != null
+                    && !tunnel.providerId().equals(producerName)
+                    || !type.equals(tunnel.type())) {
+                continue;
+            }
+            if (tunnel.providerId() != null) {
+                TunnelProvider provider = getProvider(tunnel.providerId());
+                if (provider != null) {
+                    provider.releaseTunnel(tunnel);
+                }
+            } else {
+                Set<ProviderId> ids = getProviders();
+                for (ProviderId providerId : ids) {
+                    TunnelProvider provider = getProvider(providerId);
+                    provider.releaseTunnel(tunnel);
+                }
+            }
+        }
+    }
+
+    @Override
+    public Tunnel borrowTunnel(ApplicationId consumerId, TunnelId tunnelId,
+                                  Annotations... annotations) {
+        return store.borrowTunnel(consumerId, tunnelId, annotations);
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
+                                              TunnelName tunnelName,
+                                              Annotations... annotations) {
+        return store.borrowTunnel(consumerId, tunnelName, annotations);
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
+                                              TunnelEndPoint src, TunnelEndPoint dst,
+                                              Annotations... annotations) {
+        Collection<Tunnel> tunnels = store.borrowTunnel(consumerId, src,
+                                                           dst, annotations);
+        if (tunnels == null || tunnels.size() == 0) {
+            Tunnel tunnel = new DefaultTunnel(null, src, dst, null, null, null,
+                                              null, null, annotations);
+            Set<ProviderId> ids = getProviders();
+            for (ProviderId providerId : ids) {
+                TunnelProvider provider = getProvider(providerId);
+                provider.setupTunnel(tunnel, null);
+            }
+        }
+        return tunnels;
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
+                                              TunnelEndPoint src, TunnelEndPoint dst,
+                                              Type type, Annotations... annotations) {
+        Collection<Tunnel> tunnels = store.borrowTunnel(consumerId, src,
+                                                           dst, type,
+                                                           annotations);
+        if (tunnels == null || tunnels.size() == 0) {
+            Tunnel tunnel = new DefaultTunnel(null, src, dst, type, null, null,
+                                              null, null, annotations);
+            Set<ProviderId> ids = getProviders();
+            for (ProviderId providerId : ids) {
+                TunnelProvider provider = getProvider(providerId);
+                provider.setupTunnel(tunnel, null);
+            }
+        }
+        return tunnels;
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId consumerId,
+                                     TunnelId tunnelId, Annotations... annotations) {
+        return store.returnTunnel(consumerId, tunnelId, annotations);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId consumerId,
+                                     TunnelName tunnelName,
+                                     Annotations... annotations) {
+        return store.returnTunnel(consumerId, tunnelName, annotations);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId consumerId, TunnelEndPoint src,
+                                     TunnelEndPoint dst, Type type,
+                                     Annotations... annotations) {
+        return store.returnTunnel(consumerId, src, dst, type, annotations);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId consumerId, TunnelEndPoint src,
+                                     TunnelEndPoint dst, Annotations... annotations) {
+        return store.returnTunnel(consumerId, src, dst, annotations);
+    }
+
+    @Override
+    public Tunnel queryTunnel(TunnelId tunnelId) {
+        return store.queryTunnel(tunnelId);
+    }
+
+    @Override
+    public Collection<TunnelSubscription> queryTunnelSubscription(ApplicationId consumerId) {
+        return store.queryTunnelSubscription(consumerId);
+    }
+
+    @Override
+    public Collection<Tunnel> queryTunnel(Type type) {
+        return store.queryTunnel(type);
+    }
+
+    @Override
+    public Collection<Tunnel> queryTunnel(TunnelEndPoint src, TunnelEndPoint dst) {
+        return store.queryTunnel(src, dst);
+    }
+
+    @Override
+    public int tunnelCount() {
+        return store.tunnelCount();
+    }
+
+    @Override
     protected TunnelProviderService createProviderService(TunnelProvider provider) {
-        // TODO Auto-generated method stub
         return new InternalTunnelProviderService(provider);
     }
 
     @Override
-    public TunnelProviderService register(TunnelProvider provider) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public void unregister(TunnelProvider provider) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
-    public Set<ProviderId> getProviders() {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
     public void addListener(TunnelListener listener) {
-        // TODO Auto-generated method stub
-
+        listenerRegistry.addListener(listener);
     }
 
     @Override
     public void removeListener(TunnelListener listener) {
-        // TODO Auto-generated method stub
-
-    }
-
-    private class InternalTunnelListener implements TunnelListener {
-        @Override
-        public void event(TunnelEvent event) {
-            // TODO Auto-generated method stub
-
-        }
-    }
-
-    private class InternalLinkListener implements LinkListener {
-        @Override
-        public void event(LinkEvent event) {
-            // TODO Auto-generated method stub
-
-        }
+        listenerRegistry.removeListener(listener);
     }
 
     private class InternalTunnelProviderService
@@ -156,25 +301,47 @@
             implements TunnelProviderService {
         protected InternalTunnelProviderService(TunnelProvider provider) {
             super(provider);
-            // TODO Auto-generated constructor stub
         }
 
+
         @Override
         public TunnelId tunnelAdded(TunnelDescription tunnel) {
-            // TODO Auto-generated method stub
-            return null;
+            Tunnel storedTunnel = new DefaultTunnel(provider().id(),
+                                                    tunnel.src(), tunnel.dst(),
+                                                    tunnel.type(),
+                                                    tunnel.groupId(),
+                                                    tunnel.id(),
+                                                    tunnel.tunnelName(),
+                                                    tunnel.annotations());
+            return store.createOrUpdateTunnel(storedTunnel);
         }
 
         @Override
         public void tunnelUpdated(TunnelDescription tunnel) {
-            // TODO Auto-generated method stub
-
+            Tunnel storedTunnel = new DefaultTunnel(provider().id(),
+                                                    tunnel.src(), tunnel.dst(),
+                                                    tunnel.type(),
+                                                    tunnel.groupId(),
+                                                    tunnel.id(),
+                                                    tunnel.tunnelName(),
+                                                    tunnel.annotations());
+            store.createOrUpdateTunnel(storedTunnel);
         }
 
         @Override
         public void tunnelRemoved(TunnelDescription tunnel) {
-            // TODO Auto-generated method stub
-
+            if (tunnel.id() != null) {
+                store.deleteTunnel(tunnel.id());
+            }
+            if (tunnel.src() != null && tunnel.dst() != null
+                    && tunnel.type() != null) {
+                store.deleteTunnel(tunnel.src(), tunnel.dst(), tunnel.type(),
+                                   provider().id());
+            }
+            if (tunnel.src() != null && tunnel.dst() != null
+                    && tunnel.type() == null) {
+                store.deleteTunnel(tunnel.src(), tunnel.dst(), provider().id());
+            }
         }
 
     }
@@ -182,129 +349,9 @@
     private class InternalStoreDelegate implements TunnelStoreDelegate {
         @Override
         public void notify(TunnelEvent event) {
-            // TODO Auto-generated method stub
             if (event != null) {
                 eventDispatcher.post(event);
             }
         }
     }
-
-    @Override
-    public void removeTunnel(TunnelId tunnelId) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
-    public void removeTunnels(TunnelEndPoint src, TunnelEndPoint dst,
-                              ProviderId producerName) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
-    public void removeTunnels(TunnelEndPoint src, TunnelEndPoint dst,
-                              Type type, ProviderId producerName) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
-    public void updateTunnel(Tunnel tunnel, Path path) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
-    public Tunnel borrowTunnel(ApplicationId consumerId, TunnelId tunnelId,
-                               Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
-                                           TunnelName tunnelName,
-                                           Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
-                                           TunnelEndPoint src,
-                                           TunnelEndPoint dst,
-                                           Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<Tunnel> borrowTunnel(ApplicationId consumerId,
-                                           TunnelEndPoint src,
-                                           TunnelEndPoint dst, Type type,
-                                           Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public boolean returnTunnel(ApplicationId consumerId, TunnelId tunnelId,
-                                Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return false;
-    }
-
-    @Override
-    public boolean returnTunnel(ApplicationId consumerId,
-                                TunnelName tunnelName, Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return false;
-    }
-
-    @Override
-    public boolean returnTunnel(ApplicationId consumerId, TunnelEndPoint src,
-                                TunnelEndPoint dst, Type type,
-                                Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return false;
-    }
-
-    @Override
-    public boolean returnTunnel(ApplicationId consumerId, TunnelEndPoint src,
-                                TunnelEndPoint dst, Annotations... annotations) {
-        // TODO Auto-generated method stub
-        return false;
-    }
-
-    @Override
-    public Tunnel queryTunnel(TunnelId tunnelId) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<TunnelSubscription> queryTunnelSubscription(ApplicationId consumerId) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<Tunnel> queryTunnel(Type type) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public Collection<Tunnel> queryTunnel(TunnelEndPoint src, TunnelEndPoint dst) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
-    @Override
-    public int tunnelCount() {
-        // TODO Auto-generated method stub
-        return 0;
-    }
-
 }
diff --git a/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/DistributedTunnelStore.java b/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/DistributedTunnelStore.java
new file mode 100644
index 0000000..6082842
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/DistributedTunnelStore.java
@@ -0,0 +1,503 @@
+package org.onosproject.store.tunnel.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+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.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.core.IdGenerator;
+import org.onosproject.net.Annotations;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.net.tunnel.DefaultTunnel;
+import org.onosproject.net.tunnel.Tunnel;
+import org.onosproject.net.tunnel.Tunnel.Type;
+import org.onosproject.net.tunnel.TunnelEndPoint;
+import org.onosproject.net.tunnel.TunnelEvent;
+import org.onosproject.net.tunnel.TunnelId;
+import org.onosproject.net.tunnel.TunnelName;
+import org.onosproject.net.tunnel.TunnelStore;
+import org.onosproject.net.tunnel.TunnelStoreDelegate;
+import org.onosproject.net.tunnel.TunnelSubscription;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.app.GossipApplicationStore.InternalState;
+import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.EventuallyConsistentMap;
+import org.onosproject.store.service.MultiValuedTimestamp;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.WallclockClockManager;
+import org.slf4j.Logger;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Manages inventory of tunnel in distributed data store that uses optimistic
+ * replication and gossip based techniques.
+ */
+@Component(immediate = true)
+@Service
+public class DistributedTunnelStore
+        extends AbstractStore<TunnelEvent, TunnelStoreDelegate>
+        implements TunnelStore {
+
+    private final Logger log = getLogger(getClass());
+
+    /**
+     * The topic used for obtaining globally unique ids.
+     */
+    private String runnelOpTopoic = "tunnel-ops-ids";
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterCommunicationService clusterCommunicator;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterService clusterService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    // tunnel identity as map key in the store.
+    private EventuallyConsistentMap<TunnelId, Tunnel> tunnelIdAsKeyStore;
+    // tunnel name as map key in the store.
+    private EventuallyConsistentMap<TunnelName, Set<TunnelId>> tunnelNameAsKeyStore;
+    // maintains all the tunnels between source and destination.
+    private EventuallyConsistentMap<TunnelKey, Set<TunnelId>> srcAndDstKeyStore;
+    // maintains all the tunnels by tunnel type.
+    private EventuallyConsistentMap<Tunnel.Type, Set<TunnelId>> typeKeyStore;
+    // maintains records that app subscribes tunnel.
+    private EventuallyConsistentMap<ApplicationId, Set<TunnelSubscription>> orderRelationship;
+
+    private IdGenerator idGenerator;
+
+    @Activate
+    public void activate() {
+        KryoNamespace.Builder serializer = KryoNamespace.newBuilder()
+                .register(KryoNamespaces.API)
+                .register(MultiValuedTimestamp.class)
+                .register(InternalState.class);
+        tunnelIdAsKeyStore = storageService
+                .<TunnelId, Tunnel>eventuallyConsistentMapBuilder()
+                .withName("all_tunnel").withSerializer(serializer)
+                .withClockService(new WallclockClockManager<>()).build();
+        tunnelNameAsKeyStore = storageService
+                .<TunnelName, Set<TunnelId>>eventuallyConsistentMapBuilder()
+                .withName("tunnel_name_tunnel").withSerializer(serializer)
+                .withClockService(new WallclockClockManager<>()).build();
+        srcAndDstKeyStore = storageService
+                .<TunnelKey, Set<TunnelId>>eventuallyConsistentMapBuilder()
+                .withName("src_dst_tunnel").withSerializer(serializer)
+                .withClockService(new WallclockClockManager<>()).build();
+        typeKeyStore = storageService
+                .<Tunnel.Type, Set<TunnelId>>eventuallyConsistentMapBuilder()
+                .withName("type_tunnel").withSerializer(serializer)
+                .withClockService(new WallclockClockManager<>()).build();
+        idGenerator = coreService.getIdGenerator(runnelOpTopoic);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        tunnelIdAsKeyStore.destroy();
+        srcAndDstKeyStore.destroy();
+        typeKeyStore.destroy();
+        tunnelNameAsKeyStore.destroy();
+        log.info("Stopped");
+    }
+
+    @Override
+    public TunnelId createOrUpdateTunnel(Tunnel tunnel) {
+        // tunnelIdAsKeyStore.
+        if (tunnel.tunnelId() != null && !"".equals(tunnel.tunnelId())) {
+            Tunnel old = tunnelIdAsKeyStore.get(tunnel.tunnelId());
+            if (old == null) {
+                log.info("This tunnel[" + tunnel.tunnelId() + "] is not available.");
+                return tunnel.tunnelId();
+            }
+            Tunnel newT = new DefaultTunnel(tunnel.providerId(), tunnel.src(),
+                                            tunnel.dst(), tunnel.type(),
+                                            tunnel.state(), tunnel.groupId(),
+                                            old.tunnelId(),
+                                            tunnel.tunnelName(),
+                                            tunnel.annotations());
+            tunnelIdAsKeyStore.remove(tunnel.tunnelId());
+            tunnelIdAsKeyStore.put(tunnel.tunnelId(), newT);
+            TunnelEvent event = new TunnelEvent(
+                                                TunnelEvent.Type.TUNNEL_UPDATED,
+                                                tunnel);
+            notifyDelegate(event);
+            return tunnel.tunnelId();
+        } else {
+            TunnelId tunnelId = TunnelId.valueOf(idGenerator.getNewId());
+            Tunnel newT = new DefaultTunnel(tunnel.providerId(), tunnel.src(),
+                                            tunnel.dst(), tunnel.type(),
+                                            tunnel.state(), tunnel.groupId(),
+                                            tunnelId,
+                                            tunnel.tunnelName(),
+                                            tunnel.annotations());
+            TunnelKey key = TunnelKey.tunnelKey(tunnel.src(), tunnel.dst());
+            tunnelIdAsKeyStore.put(tunnelId, newT);
+            Set<TunnelId> tunnelnameSet = tunnelNameAsKeyStore.get(tunnel
+                    .tunnelName());
+            if (tunnelnameSet == null) {
+                tunnelnameSet = new HashSet<TunnelId>();
+            }
+            tunnelnameSet.add(tunnelId);
+            tunnelNameAsKeyStore.put(tunnel
+                    .tunnelName(), tunnelnameSet);
+            Set<TunnelId> srcAndDstKeySet = srcAndDstKeyStore.get(key);
+            if (srcAndDstKeySet == null) {
+                srcAndDstKeySet = new HashSet<TunnelId>();
+            }
+            srcAndDstKeySet.add(tunnelId);
+            srcAndDstKeyStore.put(key, srcAndDstKeySet);
+            Set<TunnelId> typeKeySet = typeKeyStore.get(tunnel.type());
+            if (typeKeySet == null) {
+                typeKeySet = new HashSet<TunnelId>();
+            }
+            typeKeySet.add(tunnelId);
+            typeKeyStore.put(tunnel.type(), typeKeySet);
+            TunnelEvent event = new TunnelEvent(TunnelEvent.Type.TUNNEL_ADDED,
+                                                tunnel);
+            notifyDelegate(event);
+            return tunnelId;
+        }
+    }
+
+    @Override
+    public void deleteTunnel(TunnelId tunnelId) {
+        Tunnel deletedTunnel = tunnelIdAsKeyStore.get(tunnelId);
+        if (deletedTunnel == null) {
+            return;
+        }
+        tunnelNameAsKeyStore.get(deletedTunnel.tunnelName()).remove(tunnelId);
+        tunnelIdAsKeyStore.remove(tunnelId);
+        TunnelKey key = new TunnelKey(deletedTunnel.src(), deletedTunnel.dst());
+        srcAndDstKeyStore.get(key).remove(tunnelId);
+        typeKeyStore.get(deletedTunnel.type()).remove(tunnelId);
+        TunnelEvent event = new TunnelEvent(TunnelEvent.Type.TUNNEL_REMOVED,
+                                            deletedTunnel);
+        notifyDelegate(event);
+    }
+
+    @Override
+    public void deleteTunnel(TunnelEndPoint src, TunnelEndPoint dst,
+                             ProviderId producerName) {
+        TunnelKey key = TunnelKey.tunnelKey(src, dst);
+        Set<TunnelId> idSet = srcAndDstKeyStore.get(key);
+        if (idSet == null) {
+            return;
+        }
+        Tunnel deletedTunnel = null;
+        TunnelEvent event = null;
+        List<TunnelEvent> ls = new ArrayList<TunnelEvent>();
+        for (TunnelId id : idSet) {
+            deletedTunnel = tunnelIdAsKeyStore.get(id);
+            event = new TunnelEvent(TunnelEvent.Type.TUNNEL_REMOVED,
+                                    deletedTunnel);
+            ls.add(event);
+            if (producerName.equals(deletedTunnel.providerId())) {
+                tunnelIdAsKeyStore.remove(deletedTunnel.tunnelId());
+                tunnelNameAsKeyStore.get(deletedTunnel.tunnelName())
+                        .remove(deletedTunnel.tunnelId());
+                srcAndDstKeyStore.get(key).remove(deletedTunnel.tunnelId());
+                typeKeyStore.get(deletedTunnel.type())
+                        .remove(deletedTunnel.tunnelId());
+            }
+        }
+        notifyDelegate(ls);
+    }
+
+    @Override
+    public void deleteTunnel(TunnelEndPoint src, TunnelEndPoint dst, Type type,
+                             ProviderId producerName) {
+        TunnelKey key = TunnelKey.tunnelKey(src, dst);
+        Set<TunnelId> idSet = srcAndDstKeyStore.get(key);
+        if (idSet == null) {
+            return;
+        }
+        Tunnel deletedTunnel = null;
+        TunnelEvent event = null;
+        List<TunnelEvent> ls = new ArrayList<TunnelEvent>();
+        for (TunnelId id : idSet) {
+            deletedTunnel = tunnelIdAsKeyStore.get(id);
+            event = new TunnelEvent(TunnelEvent.Type.TUNNEL_REMOVED,
+                                    deletedTunnel);
+            ls.add(event);
+            if (producerName.equals(deletedTunnel.providerId())
+                    && type.equals(deletedTunnel.type())) {
+                tunnelIdAsKeyStore.remove(deletedTunnel.tunnelId());
+                tunnelNameAsKeyStore.get(deletedTunnel.tunnelName())
+                        .remove(deletedTunnel.tunnelId());
+                srcAndDstKeyStore.get(key).remove(deletedTunnel.tunnelId());
+                typeKeyStore.get(deletedTunnel.type())
+                        .remove(deletedTunnel.tunnelId());
+            }
+        }
+        notifyDelegate(ls);
+    }
+
+    @Override
+    public Tunnel borrowTunnel(ApplicationId appId, TunnelId tunnelId,
+                               Annotations... annotations) {
+        Set<TunnelSubscription> orderSet = orderRelationship.get(appId);
+        if (orderSet == null) {
+            orderSet = new HashSet<TunnelSubscription>();
+        }
+        TunnelSubscription order = new TunnelSubscription(appId, null, null, tunnelId, null, null,
+                                annotations);
+        Tunnel result = tunnelIdAsKeyStore.get(tunnelId);
+        if (result != null || Tunnel.State.INACTIVE.equals(result.state())) {
+            return null;
+        }
+        orderSet.add(order);
+        orderRelationship.put(appId, orderSet);
+        return result;
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId appId,
+                                           TunnelEndPoint src,
+                                           TunnelEndPoint dst,
+                                           Annotations... annotations) {
+        Set<TunnelSubscription> orderSet = orderRelationship.get(appId);
+        if (orderSet == null) {
+            orderSet = new HashSet<TunnelSubscription>();
+        }
+        TunnelSubscription order = new TunnelSubscription(appId, src, dst, null, null, null, annotations);
+        boolean isExist = orderSet.contains(order);
+        if (!isExist) {
+            orderSet.add(order);
+        }
+        orderRelationship.put(appId, orderSet);
+        TunnelKey key = TunnelKey.tunnelKey(src, dst);
+        Set<TunnelId> idSet = srcAndDstKeyStore.get(key);
+        if (idSet == null || idSet.size() == 0) {
+            return Collections.emptySet();
+        }
+        Collection<Tunnel> tunnelSet = new HashSet<Tunnel>();
+        for (TunnelId tunnelId : idSet) {
+            Tunnel result = tunnelIdAsKeyStore.get(tunnelId);
+            if (Tunnel.State.ACTIVE.equals(result.state())) {
+                tunnelSet.add(result);
+            }
+        }
+        return tunnelSet;
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId appId,
+                                           TunnelEndPoint src,
+                                           TunnelEndPoint dst, Type type,
+                                           Annotations... annotations) {
+        Set<TunnelSubscription> orderSet = orderRelationship.get(appId);
+        if (orderSet == null) {
+            orderSet = new HashSet<TunnelSubscription>();
+        }
+        TunnelSubscription order = new TunnelSubscription(appId, src, dst, null, type, null, annotations);
+        boolean isExist = orderSet.contains(order);
+        if (!isExist) {
+            orderSet.add(order);
+        }
+        orderRelationship.put(appId, orderSet);
+        TunnelKey key = TunnelKey.tunnelKey(src, dst);
+        Set<TunnelId> idSet = srcAndDstKeyStore.get(key);
+        if (idSet == null || idSet.size() == 0) {
+            return Collections.emptySet();
+        }
+        Collection<Tunnel> tunnelSet = new HashSet<Tunnel>();
+        for (TunnelId tunnelId : idSet) {
+            Tunnel result = tunnelIdAsKeyStore.get(tunnelId);
+            if (type.equals(result.type())
+                    && Tunnel.State.ACTIVE.equals(result.state())) {
+                tunnelSet.add(result);
+            }
+        }
+        return tunnelSet;
+    }
+
+    @Override
+    public Collection<Tunnel> borrowTunnel(ApplicationId appId,
+                                           TunnelName tunnelName,
+                                           Annotations... annotations) {
+        Set<TunnelSubscription> orderSet = orderRelationship.get(appId);
+        if (orderSet == null) {
+            orderSet = new HashSet<TunnelSubscription>();
+        }
+        TunnelSubscription order = new TunnelSubscription(appId, null, null, null, null, tunnelName,
+                                annotations);
+        boolean isExist = orderSet.contains(order);
+        if (!isExist) {
+            orderSet.add(order);
+        }
+        orderRelationship.put(appId, orderSet);
+        Set<TunnelId> idSet = tunnelNameAsKeyStore.get(tunnelName);
+        if (idSet == null || idSet.size() == 0) {
+            return Collections.emptySet();
+        }
+        Collection<Tunnel> tunnelSet = new HashSet<Tunnel>();
+        for (TunnelId tunnelId : idSet) {
+            Tunnel result = tunnelIdAsKeyStore.get(tunnelId);
+            if (Tunnel.State.ACTIVE.equals(result.state())) {
+                tunnelSet.add(result);
+            }
+        }
+        return tunnelSet;
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId appId, TunnelName tunnelName,
+                                Annotations... annotations) {
+        TunnelSubscription order = new TunnelSubscription(appId, null, null, null, null, tunnelName,
+                                annotations);
+        return deleteOrder(order);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId appId, TunnelId tunnelId,
+                                Annotations... annotations) {
+        TunnelSubscription order = new TunnelSubscription(appId, null, null, tunnelId, null, null,
+                                annotations);
+        return deleteOrder(order);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId appId, TunnelEndPoint src,
+                                TunnelEndPoint dst, Type type,
+                                Annotations... annotations) {
+        TunnelSubscription order = new TunnelSubscription(appId, src, dst, null, type, null, annotations);
+        return deleteOrder(order);
+    }
+
+    @Override
+    public boolean returnTunnel(ApplicationId appId, TunnelEndPoint src,
+                                TunnelEndPoint dst, Annotations... annotations) {
+        TunnelSubscription order = new TunnelSubscription(appId, src, dst, null, null, null, annotations);
+        return deleteOrder(order);
+    }
+
+    private boolean deleteOrder(TunnelSubscription order) {
+        Set<TunnelSubscription> orderSet = orderRelationship.get(order.consumerId());
+        if (orderSet == null) {
+            return true;
+        }
+        if (orderSet.contains(order)) {
+            orderSet.remove(order);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public Tunnel queryTunnel(TunnelId tunnelId) {
+        return tunnelIdAsKeyStore.get(tunnelId);
+    }
+
+    @Override
+    public Collection<TunnelSubscription> queryTunnelSubscription(ApplicationId appId) {
+        return orderRelationship.get(appId) != null ? ImmutableSet.copyOf(orderRelationship
+                .get(appId)) : Collections.emptySet();
+    }
+
+    @Override
+    public Collection<Tunnel> queryTunnel(Type type) {
+        Collection<Tunnel> result = new HashSet<Tunnel>();
+        Set<TunnelId> tunnelIds = typeKeyStore.get(type);
+        if (tunnelIds == null) {
+            return Collections.emptySet();
+        }
+        for (TunnelId id : tunnelIds) {
+            result.add(tunnelIdAsKeyStore.get(id));
+        }
+        return result.size() == 0 ? Collections.emptySet() : ImmutableSet
+                .copyOf(result);
+    }
+
+    @Override
+    public Collection<Tunnel> queryTunnel(TunnelEndPoint src, TunnelEndPoint dst) {
+        Collection<Tunnel> result = new HashSet<Tunnel>();
+        TunnelKey key = TunnelKey.tunnelKey(src, dst);
+        Set<TunnelId> tunnelIds = srcAndDstKeyStore.get(key);
+        if (tunnelIds == null) {
+            return Collections.emptySet();
+        }
+        for (TunnelId id : tunnelIds) {
+            result.add(tunnelIdAsKeyStore.get(id));
+        }
+        return result.size() == 0 ? Collections.emptySet() : ImmutableSet
+                .copyOf(result);
+    }
+
+    @Override
+    public int tunnelCount() {
+        return tunnelIdAsKeyStore.size();
+    }
+
+    /**
+     * Uses source TunnelPoint and destination TunnelPoint as map key.
+     */
+    private static final class TunnelKey {
+        private final TunnelEndPoint src;
+        private final TunnelEndPoint dst;
+
+        private TunnelKey(TunnelEndPoint src, TunnelEndPoint dst) {
+            this.src = src;
+            this.dst = dst;
+
+        }
+
+        /**
+         * create a map key.
+         *
+         * @param src
+         * @param dst
+         * @return a key using source ip and destination ip
+         */
+        static TunnelKey tunnelKey(TunnelEndPoint src, TunnelEndPoint dst) {
+            return new TunnelKey(src, dst);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(src, dst);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj instanceof TunnelKey) {
+                final TunnelKey other = (TunnelKey) obj;
+                return Objects.equals(this.src, other.src)
+                        && Objects.equals(this.dst, other.dst);
+            }
+            return false;
+        }
+
+        @Override
+        public String toString() {
+            return MoreObjects.toStringHelper(getClass()).add("src", src)
+                    .add("dst", dst).toString();
+        }
+    }
+
+}
diff --git a/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/package-info.java b/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/package-info.java
new file mode 100644
index 0000000..44ce0fe
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/tunnel/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Implementation of distributed tunnel store using p2p synchronization protocol.
+ */
+package org.onosproject.store.tunnel.impl;