diff --git a/apps/routing/src/main/java/org/onosproject/routing/impl/IntentSynchronizer.java b/apps/routing/src/main/java/org/onosproject/routing/impl/IntentSynchronizer.java
new file mode 100644
index 0000000..22c7d43
--- /dev/null
+++ b/apps/routing/src/main/java/org/onosproject/routing/impl/IntentSynchronizer.java
@@ -0,0 +1,297 @@
+/*
+ * Copyright 2016 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.routing.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.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.LeadershipEvent;
+import org.onosproject.cluster.LeadershipEventListener;
+import org.onosproject.cluster.LeadershipService;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentService;
+import org.onosproject.net.intent.IntentState;
+import org.onosproject.net.intent.IntentUtils;
+import org.onosproject.net.intent.Key;
+import org.onosproject.routing.IntentSynchronizationAdminService;
+import org.onosproject.routing.IntentSynchronizationService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+
+/**
+ * Synchronizes intents between an in-memory intent store and the IntentService.
+ */
+@Service
+@Component(immediate = false)
+public class IntentSynchronizer implements IntentSynchronizationService,
+        IntentSynchronizationAdminService {
+
+    private static final Logger log = LoggerFactory.getLogger(IntentSynchronizer.class);
+
+    private static final String APP_NAME = "org.onosproject.intentsynchronizer";
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected LeadershipService leadershipService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterService clusterService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected IntentService intentService;
+
+    private ApplicationId appId;
+
+    private final InternalLeadershipListener leadershipEventListener =
+            new InternalLeadershipListener();
+
+    private final Map<Key, Intent> intents = new ConcurrentHashMap<>();
+
+    private ExecutorService intentsSynchronizerExecutor;
+
+    private volatile boolean isElectedLeader = false;
+    private volatile boolean isActivatedLeader = false;
+
+    @Activate
+    public void activate() {
+        intentsSynchronizerExecutor = createExecutor();
+
+        this.appId = coreService.registerApplication(APP_NAME);
+
+        leadershipService.addListener(leadershipEventListener);
+        leadershipService.runForLeadership(appId.name());
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        leadershipService.withdraw(appId.name());
+        leadershipService.removeListener(leadershipEventListener);
+
+        synchronized (this) {
+            intentsSynchronizerExecutor.shutdownNow();
+        }
+
+        log.info("Stopped");
+    }
+
+    /**
+     * Creates an executor that will be used for synchronization tasks.
+     * <p>
+     * Can be overridden to change the type of executor used.
+     * </p>
+     *
+     * @return executor service
+     */
+    protected ExecutorService createExecutor() {
+        return newSingleThreadExecutor(groupedThreads("onos/" + appId, "sync"));
+    }
+
+    @Override
+    public void removeIntents() {
+        if (!isElectedLeader) {
+            // Only leader will withdraw intents
+            return;
+        }
+
+        log.debug("Intent Synchronizer shutdown: withdrawing all intents...");
+
+        for (Entry<Key, Intent> entry : intents.entrySet()) {
+            intentService.withdraw(entry.getValue());
+            log.debug("Intent Synchronizer withdrawing intent: {}",
+                      entry.getValue());
+        }
+
+        intents.clear();
+        log.info("Tried to clean all intents");
+    }
+
+    @Override
+    public void submit(Intent intent) {
+        synchronized (this) {
+            intents.put(intent.key(), intent);
+            if (isElectedLeader && isActivatedLeader) {
+                log.trace("Submitting intent: {}", intent);
+                intentService.submit(intent);
+            }
+        }
+    }
+
+    @Override
+    public void withdraw(Intent intent) {
+        synchronized (this) {
+            intents.remove(intent.key(), intent);
+            if (isElectedLeader && isActivatedLeader) {
+                log.trace("Withdrawing intent: {}", intent);
+                intentService.withdraw(intent);
+            }
+        }
+    }
+
+    /**
+     * Signals the synchronizer that the leadership has changed.
+     *
+     * @param isLeader true if this instance is now the leader, otherwise false
+     */
+    private void leaderChanged(boolean isLeader) {
+        log.debug("Leader changed: {}", isLeader);
+
+        if (!isLeader) {
+            this.isElectedLeader = false;
+            this.isActivatedLeader = false;
+            // Nothing to do
+            return;
+        }
+        this.isActivatedLeader = false;
+        this.isElectedLeader = true;
+
+        // Run the synchronization task
+        intentsSynchronizerExecutor.execute(this::synchronizeIntents);
+    }
+
+    private void synchronizeIntents() {
+        Map<Key, Intent> serviceIntents = new HashMap<>();
+        intentService.getIntents().forEach(i -> {
+            if (i.appId().equals(appId)) {
+                serviceIntents.put(i.key(), i);
+            }
+        });
+
+        List<Intent> intentsToAdd = new LinkedList<>();
+        List<Intent> intentsToRemove = new LinkedList<>();
+
+        for (Intent localIntent : intents.values()) {
+            Intent serviceIntent = serviceIntents.remove(localIntent.key());
+            if (serviceIntent == null) {
+                intentsToAdd.add(localIntent);
+            } else {
+                IntentState state = intentService.getIntentState(serviceIntent.key());
+                if (!IntentUtils.intentsAreEqual(serviceIntent, localIntent) || state == null ||
+                        state == IntentState.WITHDRAW_REQ ||
+                        state == IntentState.WITHDRAWING ||
+                        state == IntentState.WITHDRAWN) {
+                    intentsToAdd.add(localIntent);
+                }
+            }
+        }
+
+        for (Intent serviceIntent : serviceIntents.values()) {
+            IntentState state = intentService.getIntentState(serviceIntent.key());
+            if (state != null && state != IntentState.WITHDRAW_REQ
+                    && state != IntentState.WITHDRAWING
+                    && state != IntentState.WITHDRAWN) {
+                intentsToRemove.add(serviceIntent);
+            }
+        }
+
+        log.debug("Intent Synchronizer: submitting {}, withdrawing {}",
+                intentsToAdd.size(), intentsToRemove.size());
+
+        // Withdraw Intents
+        for (Intent intent : intentsToRemove) {
+            intentService.withdraw(intent);
+            log.trace("Intent Synchronizer: withdrawing intent: {}",
+                    intent);
+        }
+        if (!isElectedLeader) {
+            log.debug("Intent Synchronizer: cannot withdraw intents: " +
+                    "not elected leader anymore");
+            isActivatedLeader = false;
+            return;
+        }
+
+        // Add Intents
+        for (Intent intent : intentsToAdd) {
+            intentService.submit(intent);
+            log.trace("Intent Synchronizer: submitting intent: {}",
+                    intent);
+        }
+        if (!isElectedLeader) {
+            log.debug("Intent Synchronizer: cannot submit intents: " +
+                    "not elected leader anymore");
+            isActivatedLeader = false;
+            return;
+        }
+
+        if (isElectedLeader) {
+            // Allow push of Intents
+            isActivatedLeader = true;
+        } else {
+            isActivatedLeader = false;
+        }
+        log.debug("Intent synchronization completed");
+    }
+
+    @Override
+    public void modifyPrimary(boolean isPrimary) {
+        leaderChanged(isPrimary);
+    }
+
+    /**
+     * A listener for leadership events.
+     */
+    private class InternalLeadershipListener implements LeadershipEventListener {
+
+        @Override
+        public void event(LeadershipEvent event) {
+            if (!event.subject().topic().equals(appId.name())) {
+                // Not our topic: ignore
+                return;
+            }
+            if (!Objects.equals(event.subject().leader(),
+                    clusterService.getLocalNode().id())) {
+                // The event is not about this instance: ignore
+                return;
+            }
+
+            switch (event.type()) {
+            case LEADER_ELECTED:
+                log.info("IntentSynchronizer gained leadership");
+                leaderChanged(true);
+                break;
+            case LEADER_BOOTED:
+                log.info("IntentSynchronizer lost leadership");
+                leaderChanged(false);
+                break;
+            case LEADER_REELECTED:
+            default:
+                break;
+            }
+        }
+    }
+}