diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
index b4aaec8..8b4b31c 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
@@ -38,6 +38,7 @@
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.Link;
 import org.onosproject.net.PortNumber;
+import org.onosproject.net.flowobjective.Objective;
 import org.onosproject.segmentrouting.config.DeviceConfigNotFoundException;
 import org.onosproject.segmentrouting.config.DeviceConfiguration;
 import org.onosproject.segmentrouting.grouphandler.DefaultGroupHandler;
@@ -203,7 +204,7 @@
 
     /**
     * Determines if routing in the network has been stable in the last
-    * STABLITY_THRESHOLD seconds, by comparing the current time to the last
+    * STABILITY_THRESHOLD seconds, by comparing the current time to the last
     * routing change timestamp.
     *
     * @return true if stable
@@ -1359,12 +1360,15 @@
      * @param hostVlanId Vlan ID of the nexthop
      * @param outPort port where the next hop attaches to
      * @param directHost host is of type direct or indirect
+     * @return future that includes the flow objective if succeeded, null if otherwise
      */
-    void populateRoute(DeviceId deviceId, IpPrefix prefix,
-                       MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
+    CompletableFuture<Objective> populateRoute(DeviceId deviceId, IpPrefix prefix, MacAddress hostMac,
+                                               VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         if (shouldProgram(deviceId)) {
-            srManager.routingRulePopulator.populateRoute(deviceId, prefix, hostMac, hostVlanId, outPort, directHost);
+            return srManager.routingRulePopulator.populateRoute(deviceId, prefix,
+                    hostMac, hostVlanId, outPort, directHost);
         }
+        return CompletableFuture.completedFuture(null);
     }
 
     /**
@@ -1377,24 +1381,29 @@
      * @param hostVlanId Vlan ID of the nexthop
      * @param outPort port that next hop attaches to
      * @param directHost host is of type direct or indirect
+     * @return future that carries the flow objective if succeeded, null if otherwise
      */
-    void revokeRoute(DeviceId deviceId, IpPrefix prefix,
+    CompletableFuture<Objective> revokeRoute(DeviceId deviceId, IpPrefix prefix,
                      MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         if (shouldProgram(deviceId)) {
-            srManager.routingRulePopulator.revokeRoute(deviceId, prefix, hostMac, hostVlanId, outPort, directHost);
+            return srManager.routingRulePopulator.revokeRoute(deviceId, prefix, hostMac, hostVlanId,
+                    outPort, directHost);
         }
+        return CompletableFuture.completedFuture(null);
     }
 
-    void populateBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
+    CompletableFuture<Objective> populateBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
         if (shouldProgram(deviceId)) {
-            srManager.routingRulePopulator.populateBridging(deviceId, port, mac, vlanId);
+            return srManager.routingRulePopulator.populateBridging(deviceId, port, mac, vlanId);
         }
+        return CompletableFuture.completedFuture(null);
     }
 
-    void revokeBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
+    CompletableFuture<Objective> revokeBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
         if (shouldProgram(deviceId)) {
-            srManager.routingRulePopulator.revokeBridging(deviceId, port, mac, vlanId);
+            return srManager.routingRulePopulator.revokeBridging(deviceId, port, mac, vlanId);
         }
+        return CompletableFuture.completedFuture(null);
     }
 
     void updateBridging(DeviceId deviceId, PortNumber portNum, MacAddress hostMac,
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/HostHandler.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/HostHandler.java
index a21e327..46231b0 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/HostHandler.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/HostHandler.java
@@ -16,28 +16,37 @@
 
 package org.onosproject.segmentrouting;
 
+import com.google.common.collect.Lists;
 import org.onlab.packet.EthType;
 import org.onlab.packet.IpAddress;
 import org.onlab.packet.IpPrefix;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
 import org.onlab.util.PredictableExecutor;
+import org.onlab.util.Tools;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.Host;
 import org.onosproject.net.HostLocation;
 import org.onosproject.net.PortNumber;
+import org.onosproject.net.flowobjective.Objective;
 import org.onosproject.net.host.HostEvent;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.host.ProbeMode;
+import org.onosproject.segmentrouting.phasedrecovery.api.Phase;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.google.common.collect.Sets;
 
 import java.util.HashSet;
+import java.util.List;
 import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 
 import static com.google.common.base.Preconditions.checkArgument;
@@ -75,19 +84,54 @@
     }
 
     protected void init(DeviceId devId) {
+        log.info("Initializing hosts on {}", devId);
+        List<CompletableFuture<Void>> hostFutures = Lists.newArrayList();
+
         // Init hosts in parallel using hostWorkers executor
-        hostService.getHosts().forEach(
-                host -> hostWorkers.execute(() -> initHost(host, devId), host.id().hashCode())
-        );
+        hostService.getHosts().forEach(host -> {
+            hostFutures.add(hostWorkers.submit(() -> initHost(host, devId), host.id().hashCode()));
+        });
+
+        log.debug("{} hostFutures for {}", hostFutures.size(), devId);
+        CompletableFuture<Void> allHostFuture = CompletableFuture.allOf(hostFutures.toArray(new CompletableFuture[0]));
+        CompletableFuture<Void> timeoutFuture =
+                Tools.completeAfter(PhasedRecoveryService.PAIR_TIMEOUT, TimeUnit.SECONDS);
+
+        allHostFuture.runAfterEitherAsync(timeoutFuture, () -> {
+            if (allHostFuture.isDone()) {
+                log.info("{} hosts initialized. Move {} to the next phase", hostFutures.size(), devId);
+            } else {
+                log.info("Timeout reached. Move {} to the next phase", devId);
+            }
+            srManager.phasedRecoveryService.setPhase(devId, Phase.INFRA);
+        });
     }
 
     private void initHost(Host host, DeviceId deviceId) {
+        List<CompletableFuture<Objective>> locationFutures = Lists.newArrayList();
+
         effectiveLocations(host).forEach(location -> {
             if (location.deviceId().equals(deviceId) ||
                     location.deviceId().equals(srManager.getPairDeviceId(deviceId).orElse(null))) {
-                processHostAddedAtLocation(host, location);
+                locationFutures.addAll(processHostAddedAtLocation(host, location));
             }
         });
+
+        log.debug("{} locationFutures for {}", locationFutures.size(), host);
+
+        // Waiting for all locationFutures to be completed.
+        // This is a blocking operation but it is fine since this is run in a separate thread
+        try {
+            CompletableFuture.allOf(locationFutures.toArray(new CompletableFuture[0]))
+                    .thenApply(objectives -> locationFutures.stream()
+                            .map(CompletableFuture::join)
+                            .collect(Collectors.toList())
+                    )
+                    .get();
+        } catch (InterruptedException | ExecutionException e) {
+            log.warn("Exception caught when executing locationFutures");
+            locationFutures.forEach(future -> future.cancel(false));
+        }
     }
 
     void processHostAddedEvent(HostEvent event) {
@@ -107,7 +151,7 @@
         }
     }
 
-    void processHostAddedAtLocation(Host host, HostLocation location) {
+    List<CompletableFuture<Objective>> processHostAddedAtLocation(Host host, HostLocation location) {
         checkArgument(effectiveLocations(host).contains(location), "{} is not a location of {}", location, host);
 
         MacAddress hostMac = host.mac();
@@ -116,15 +160,22 @@
         Set<IpAddress> ips = host.ipAddresses();
         log.info("Host {}/{} is added at {}", hostMac, hostVlanId, locations);
 
+        List<CompletableFuture<Objective>> objectiveFutures = Lists.newArrayList();
+
+        // TODO Phased recovery does not trace double tagged hosts
         if (isDoubleTaggedHost(host)) {
             ips.forEach(ip ->
                 processDoubleTaggedRoutingRule(location.deviceId(), location.port(), hostMac,
                                                host.innerVlan(), hostVlanId, host.tpid(), ip, false)
             );
         } else {
-            processBridgingRule(location.deviceId(), location.port(), hostMac, hostVlanId, false);
+            objectiveFutures.add(
+                    processBridgingRule(location.deviceId(), location.port(), hostMac, hostVlanId, false)
+            );
             ips.forEach(ip ->
-                processRoutingRule(location.deviceId(), location.port(), hostMac, hostVlanId, ip, false)
+                objectiveFutures.add(
+                        processRoutingRule(location.deviceId(), location.port(), hostMac, hostVlanId, ip, false)
+                )
             );
         }
 
@@ -141,9 +192,14 @@
                         return;
                     }
 
-                    processBridgingRule(pairDeviceId, pairRemotePort, hostMac, vlanId, false);
-                    ips.forEach(ip -> processRoutingRule(pairDeviceId, pairRemotePort, hostMac, vlanId,
-                                    ip, false));
+                    objectiveFutures.add(
+                            processBridgingRule(pairDeviceId, pairRemotePort, hostMac, vlanId, false)
+                    );
+                    ips.forEach(ip ->
+                            objectiveFutures.add(
+                                    processRoutingRule(pairDeviceId, pairRemotePort, hostMac, vlanId, ip, false)
+                            )
+                    );
 
                     if (srManager.activeProbing) {
                         probe(host, location, pairDeviceId, pairRemotePort);
@@ -160,6 +216,9 @@
             srManager.updateMacVlanTreatment(location.deviceId(), hostMac, vlanId,
                                 location.port(), nextId);
         }
+
+        log.debug("{} objectiveFutures for {}", objectiveFutures.size(), location);
+        return objectiveFutures;
     }
 
     void processHostRemovedEvent(HostEvent event) {
@@ -552,16 +611,17 @@
      * @param mac mac address
      * @param vlanId VLAN ID
      * @param revoke true to revoke the rule; false to populate
+     * @return future that includes the flow objective if succeeded, null if otherwise
      */
-    private void processBridgingRule(DeviceId deviceId, PortNumber port, MacAddress mac,
+    private CompletableFuture<Objective> processBridgingRule(DeviceId deviceId, PortNumber port, MacAddress mac,
                                      VlanId vlanId, boolean revoke) {
         log.info("{} bridging entry for host {}/{} at {}:{}", revoke ? "Revoking" : "Populating",
                 mac, vlanId, deviceId, port);
 
         if (!revoke) {
-            srManager.defaultRoutingHandler.populateBridging(deviceId, port, mac, vlanId);
+            return srManager.defaultRoutingHandler.populateBridging(deviceId, port, mac, vlanId);
         } else {
-            srManager.defaultRoutingHandler.revokeBridging(deviceId, port, mac, vlanId);
+            return srManager.defaultRoutingHandler.revokeBridging(deviceId, port, mac, vlanId);
         }
     }
 
@@ -575,20 +635,21 @@
      * @param vlanId VLAN ID
      * @param ip IP address
      * @param revoke true to revoke the rule; false to populate
+     * @return future that includes the flow objective if succeeded, null if otherwise
      */
-    private void processRoutingRule(DeviceId deviceId, PortNumber port, MacAddress mac,
+    private CompletableFuture<Objective> processRoutingRule(DeviceId deviceId, PortNumber port, MacAddress mac,
                                     VlanId vlanId, IpAddress ip, boolean revoke) {
         ConnectPoint location = new ConnectPoint(deviceId, port);
         if (!srManager.deviceConfiguration.inSameSubnet(location, ip)) {
             log.info("{} is not included in the subnet config of {}/{}. Ignored.", ip, deviceId, port);
-            return;
+            return CompletableFuture.completedFuture(null);
         }
 
         log.info("{} routing rule for {} at {}", revoke ? "Revoking" : "Populating", ip, location);
         if (revoke) {
-            srManager.defaultRoutingHandler.revokeRoute(deviceId, ip.toIpPrefix(), mac, vlanId, port, true);
+            return srManager.defaultRoutingHandler.revokeRoute(deviceId, ip.toIpPrefix(), mac, vlanId, port, true);
         } else {
-            srManager.defaultRoutingHandler.populateRoute(deviceId, ip.toIpPrefix(), mac, vlanId, port, true);
+            return srManager.defaultRoutingHandler.populateRoute(deviceId, ip.toIpPrefix(), mac, vlanId, port, true);
         }
     }
 
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RouteHandler.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RouteHandler.java
index cc03597..d9372fe 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RouteHandler.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RouteHandler.java
@@ -51,25 +51,30 @@
     }
 
     protected void init(DeviceId deviceId) {
-        Optional<DeviceId> pairDeviceId = srManager.getPairDeviceId(deviceId);
-
         srManager.routeService.getRouteTables().stream()
                 .map(srManager.routeService::getRoutes)
                 .flatMap(Collection::stream)
                 .map(RouteInfo::allRoutes)
-                .filter(allRoutes -> allRoutes.stream().allMatch(resolvedRoute ->
-                        srManager.nextHopLocations(resolvedRoute).stream().allMatch(cp ->
-                            deviceId.equals(cp.deviceId()) ||
-                                    (pairDeviceId.isPresent() && pairDeviceId.get().equals(cp.deviceId()))
-                        )))
-                .forEach(this::processRouteAddedInternal);
+                .filter(allRoutes -> allRoutes.stream().anyMatch(resolvedRoute ->
+                        srManager.nextHopLocations(resolvedRoute).stream()
+                                .anyMatch(cp -> deviceId.equals(cp.deviceId()))))
+                .forEach(rr -> processRouteAddedInternal(rr, true));
     }
 
     void processRouteAdded(RouteEvent event) {
-        processRouteAddedInternal(event.alternatives());
+        processRouteAddedInternal(event.alternatives(), false);
     }
 
-    private void processRouteAddedInternal(Collection<ResolvedRoute> routes) {
+    /**
+     * Internal logic that handles route addition.
+     *
+     * @param routes collection of routes to be processed
+     * @param populateRouteOnly true if we only want to populateRoute but not populateSubnet.
+     *                          Set it to true when initializing a device coming up.
+     *                          populateSubnet will be done when link comes up later so it is redundant.
+     *                          populateRoute still needs to be done for statically configured next hop hosts.
+     */
+    private void processRouteAddedInternal(Collection<ResolvedRoute> routes, boolean populateRouteOnly) {
         if (!isReady()) {
             log.info("System is not ready. Skip adding route for {}", routes);
             return;
@@ -82,6 +87,11 @@
             return;
         }
 
+        ResolvedRoute rr = routes.stream().findFirst().orElse(null);
+        if (rr == null) {
+            log.warn("No resolved route found. Abort processRouteAddedInternal");
+        }
+
         Set<ConnectPoint> allLocations = Sets.newHashSet();
         Set<IpPrefix> allPrefixes = Sets.newHashSet();
         routes.forEach(route -> {
@@ -91,6 +101,7 @@
         log.debug("RouteAdded. populateSubnet {}, {}", allLocations, allPrefixes);
         srManager.defaultRoutingHandler.populateSubnet(allLocations, allPrefixes);
 
+
         routes.forEach(route -> {
             IpPrefix prefix = route.prefix();
             MacAddress nextHopMac = route.nextHopMac();
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
index b5fcbcb..a6f6e32 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
@@ -67,6 +67,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.stream.Collectors;
 
@@ -133,18 +134,27 @@
      * @param port port
      * @param mac mac address
      * @param vlanId VLAN ID
+     * @return future that carries the flow objective if succeeded, null if otherwise
      */
-    void populateBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
+    CompletableFuture<Objective> populateBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
         ForwardingObjective.Builder fob = bridgingFwdObjBuilder(deviceId, mac, vlanId, port, false);
         if (fob == null) {
             log.warn("Fail to build fwd obj for host {}/{}. Abort.", mac, vlanId);
-            return;
+            return CompletableFuture.completedFuture(null);
         }
 
+        CompletableFuture<Objective> future = new CompletableFuture<>();
         ObjectiveContext context = new DefaultObjectiveContext(
-                (objective) -> log.debug("Brigding rule for {}/{} populated", mac, vlanId),
-                (objective, error) -> log.warn("Failed to populate bridging rule for {}/{}: {}", mac, vlanId, error));
+                (objective) -> {
+                    log.debug("Brigding rule for {}/{} populated", mac, vlanId);
+                    future.complete(objective);
+                },
+                (objective, error) -> {
+                    log.warn("Failed to populate bridging rule for {}/{}: {}", mac, vlanId, error);
+                    future.complete(null);
+                });
         srManager.flowObjectiveService.forward(deviceId, fob.add(context));
+        return future;
     }
 
     /**
@@ -155,18 +165,27 @@
      * @param port port
      * @param mac mac address
      * @param vlanId VLAN ID
+     * @return future that carries the flow objective if succeeded, null if otherwise
      */
-    void revokeBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
+    CompletableFuture<Objective> revokeBridging(DeviceId deviceId, PortNumber port, MacAddress mac, VlanId vlanId) {
         ForwardingObjective.Builder fob = bridgingFwdObjBuilder(deviceId, mac, vlanId, port, true);
         if (fob == null) {
             log.warn("Fail to build fwd obj for host {}/{}. Abort.", mac, vlanId);
-            return;
+            return CompletableFuture.completedFuture(null);
         }
 
+        CompletableFuture<Objective> future = new CompletableFuture<>();
         ObjectiveContext context = new DefaultObjectiveContext(
-                (objective) -> log.debug("Brigding rule for {}/{} revoked", mac, vlanId),
-                (objective, error) -> log.warn("Failed to revoke bridging rule for {}/{}: {}", mac, vlanId, error));
+                (objective) -> {
+                    log.debug("Brigding rule for {}/{} revoked", mac, vlanId);
+                    future.complete(objective);
+                },
+                (objective, error) -> {
+                    log.warn("Failed to revoke bridging rule for {}/{}: {}", mac, vlanId, error);
+                    future.complete(null);
+                });
         srManager.flowObjectiveService.forward(deviceId, fob.remove(context));
+        return future;
     }
 
     /**
@@ -309,8 +328,9 @@
      * @param hostVlanId Vlan ID of the nexthop
      * @param outPort port where the next hop attaches to
      * @param directHost host is of type direct or indirect
+     * @return future that carries the flow objective if succeeded, null if otherwise
      */
-    void populateRoute(DeviceId deviceId, IpPrefix prefix,
+    CompletableFuture<Objective> populateRoute(DeviceId deviceId, IpPrefix prefix,
                               MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         log.debug("Populate direct routing entry for route {} at {}:{}",
                 prefix, deviceId, outPort);
@@ -320,23 +340,28 @@
                                               hostVlanId, outPort, null, null, directHost, false);
         } catch (DeviceConfigNotFoundException e) {
             log.warn(e.getMessage() + " Aborting direct populateRoute");
-            return;
+            return CompletableFuture.completedFuture(null);
         }
         if (fwdBuilder == null) {
             log.warn("Aborting host routing table entry due "
                     + "to error for dev:{} route:{}", deviceId, prefix);
-            return;
+            return CompletableFuture.completedFuture(null);
         }
 
         int nextId = fwdBuilder.add().nextId();
+        CompletableFuture<Objective> future = new CompletableFuture<>();
         ObjectiveContext context = new DefaultObjectiveContext(
-                (objective) -> log.debug("Direct routing rule for route {} populated. nextId={}",
-                                         prefix, nextId),
-                (objective, error) ->
-                        log.warn("Failed to populate direct routing rule for route {}: {}",
-                                 prefix, error));
+                (objective) -> {
+                    log.debug("Direct routing rule for route {} populated. nextId={}", prefix, nextId);
+                    future.complete(objective);
+                },
+                (objective, error) -> {
+                    log.warn("Failed to populate direct routing rule for route {}: {}", prefix, error);
+                    future.complete(null);
+                });
         srManager.flowObjectiveService.forward(deviceId, fwdBuilder.add(context));
         rulePopulationCounter.incrementAndGet();
+        return future;
     }
 
     /**
@@ -349,8 +374,9 @@
      * @param hostVlanId Vlan ID of the nexthop
      * @param outPort port that next hop attaches to
      * @param directHost host is of type direct or indirect
+     * @return future that carries the flow objective if succeeded, null if otherwise
      */
-    void revokeRoute(DeviceId deviceId, IpPrefix prefix,
+    CompletableFuture<Objective> revokeRoute(DeviceId deviceId, IpPrefix prefix,
             MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         log.debug("Revoke IP table entry for route {} at {}:{}",
                 prefix, deviceId, outPort);
@@ -360,18 +386,26 @@
                                               hostVlanId, outPort, null, null, directHost, true);
         } catch (DeviceConfigNotFoundException e) {
             log.warn(e.getMessage() + " Aborting revokeIpRuleForHost.");
-            return;
+            return CompletableFuture.completedFuture(null);
         }
         if (fwdBuilder == null) {
             log.warn("Aborting host routing table entries due "
                     + "to error for dev:{} route:{}", deviceId, prefix);
-            return;
+            return CompletableFuture.completedFuture(null);
         }
+
+        CompletableFuture<Objective> future = new CompletableFuture<>();
         ObjectiveContext context = new DefaultObjectiveContext(
-                (objective) -> log.debug("IP rule for route {} revoked", prefix),
-                (objective, error) ->
-                        log.warn("Failed to revoke IP rule for route {}: {}", prefix, error));
+                (objective) -> {
+                    log.debug("IP rule for route {} revoked", prefix);
+                    future.complete(objective);
+                },
+                (objective, error) -> {
+                    log.warn("Failed to revoke IP rule for route {}: {}", prefix, error);
+                    future.complete(null);
+                });
         srManager.flowObjectiveService.forward(deviceId, fwdBuilder.remove(context));
+        return future;
     }
 
     /**
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
index 12bd9e4..5f11501 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
@@ -104,6 +104,7 @@
 import org.onosproject.segmentrouting.mcast.McastRole;
 import org.onosproject.segmentrouting.mcast.McastRoleStoreKey;
 import org.onosproject.segmentrouting.mcast.McastStoreKey;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
 import org.onosproject.segmentrouting.pwaas.DefaultL2Tunnel;
 import org.onosproject.segmentrouting.pwaas.DefaultL2TunnelDescription;
 import org.onosproject.segmentrouting.pwaas.DefaultL2TunnelHandler;
@@ -261,6 +262,10 @@
             policy = ReferencePolicy.DYNAMIC)
     public volatile XconnectService xconnectService;
 
+    @Reference(cardinality = ReferenceCardinality.OPTIONAL,
+            policy = ReferencePolicy.DYNAMIC)
+    volatile PhasedRecoveryService phasedRecoveryService;
+
     /** Enable active probing to discover dual-homed hosts. */
     boolean activeProbing = ACTIVE_PROBING_DEFAULT;
 
@@ -1049,6 +1054,21 @@
     }
 
     @Override
+    public boolean isRoutingStable() {
+        return defaultRoutingHandler.isRoutingStable();
+    }
+
+    @Override
+    public void initHost(DeviceId deviceId) {
+        hostEventExecutor.execute(() -> hostHandler.init(deviceId));
+    }
+
+    @Override
+    public void initRoute(DeviceId deviceId) {
+        routeEventExecutor.execute(() -> routeHandler.init(deviceId));
+    }
+
+    @Override
     public ApplicationId appId() {
         return appId;
     }
@@ -1146,6 +1166,25 @@
         return Optional.ofNullable(deviceConfig).map(SegmentRoutingDeviceConfig::pairLocalPort);
     }
 
+    @Override
+    public Set<PortNumber> getInfraPorts(DeviceId deviceId) {
+        return deviceService.getPorts(deviceId).stream()
+                .map(port -> new ConnectPoint(port.element().id(), port.number()))
+                .filter(cp -> interfaceService.getInterfacesByPort(cp).isEmpty())
+                .map(ConnectPoint::port)
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public Set<PortNumber> getEdgePorts(DeviceId deviceId) {
+        return deviceService.getPorts(deviceId).stream()
+                .map(port -> new ConnectPoint(port.element().id(), port.number()))
+                .filter(cp -> !interfaceService.getInterfacesByPort(cp).isEmpty() &&
+                        !cp.port().equals(getPairLocalPort(deviceId).orElse(null)))
+                .map(ConnectPoint::port)
+                .collect(Collectors.toSet());
+    }
+
     /**
      * Returns locations of given resolved route.
      *
@@ -1570,11 +1609,10 @@
             DefaultGroupHandler groupHandler = groupHandlerMap.get(deviceId);
             groupHandler.createGroupsFromVlanConfig();
             routingRulePopulator.populateSubnetBroadcastRule(deviceId);
+            phasedRecoveryService.init(deviceId);
         }
 
         appCfgHandler.init(deviceId);
-        hostEventExecutor.execute(() -> hostHandler.init(deviceId));
-        routeEventExecutor.execute(() -> routeHandler.init(deviceId));
     }
 
     private void processDeviceRemoved(Device device) {
@@ -1610,6 +1648,8 @@
         // done after all rerouting or rehashing has been completed
         groupHandlerMap.entrySet()
             .forEach(entry -> entry.getValue().cleanUpForNeighborDown(device.id()));
+
+        phasedRecoveryService.reset(device.id());
     }
 
     /**
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingService.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingService.java
index 7721036..3bfd88b 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingService.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/SegmentRoutingService.java
@@ -15,7 +15,6 @@
  */
 package org.onosproject.segmentrouting;
 
-import com.google.common.annotations.Beta;
 import com.google.common.collect.Multimap;
 import org.apache.commons.lang3.NotImplementedException;
 import org.onlab.packet.IpAddress;
@@ -354,6 +353,29 @@
     Map<DeviceId, List<McastFilteringObjStoreKey>> getMcastFilters();
 
     /**
+     * Determines if routing in the network has been stable in the last
+     * STABILITY_THRESHOLD seconds, by comparing the current time to the last
+     * routing change timestamp.
+     *
+     * @return true if stable
+     */
+    boolean isRoutingStable();
+
+    /**
+     * Invoke hostHandler.init() for given device.
+     *
+     * @param deviceId device ID
+     */
+    void initHost(DeviceId deviceId);
+
+    /**
+     * Invoke routeHandler.init() for given device.
+     *
+     * @param deviceId device ID
+     */
+    void initRoute(DeviceId deviceId);
+
+    /**
      * Gets application id.
      *
      * @return application id
@@ -371,33 +393,47 @@
      * @param connectPoint connect point
      * @return internal VLAN or null if both vlan-untagged and vlan-native are undefined
      */
-    @Beta
     default VlanId getInternalVlanId(ConnectPoint connectPoint) {
         throw new NotImplementedException("getInternalVlanId not implemented");
     }
 
-
     /**
      * Returns optional pair device ID of given device.
      *
      * @param deviceId device ID
      * @return optional pair device ID. Might be empty if pair device is not configured
      */
-    @Beta
     default Optional<DeviceId> getPairDeviceId(DeviceId deviceId) {
         throw new NotImplementedException("getPairDeviceId not implemented");
     }
 
-
     /**
      * Returns optional pair device local port of given device.
      *
      * @param deviceId device ID
      * @return optional pair device ID. Might be empty if pair device is not configured
      */
-    @Beta
     default Optional<PortNumber> getPairLocalPort(DeviceId deviceId) {
         throw new NotImplementedException("getPairLocalPort not implemented");
     }
 
+    /**
+     * Returns a set of infrastructure ports on the given device.
+     *
+     * @param deviceId device ID
+     * @return a set of ports that does not have interface configuration
+     */
+    default Set<PortNumber> getInfraPorts(DeviceId deviceId) {
+        throw new NotImplementedException("getInfraPorts not implemented");
+    }
+
+    /**
+     * Returns a set of edge ports on the given device.
+     *
+     * @param deviceId device ID
+     * @return a set of ports that has interface configuration
+     */
+    default Set<PortNumber> getEdgePorts(DeviceId deviceId) {
+        throw new NotImplementedException("getEdgePorts not implemented");
+    }
 }
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java
new file mode 100644
index 0000000..bd16068
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2014-present Open Networking Foundation
+ *
+ * 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.cli;
+
+import com.google.common.collect.Lists;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.segmentrouting.phasedrecovery.api.Phase;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Phase completer.
+ */
+@Service
+public class PhaseCompleter extends AbstractChoicesCompleter {
+    @Override
+    protected List<String> choices() {
+        return Lists.newArrayList(Phase.values()).stream().map(Enum::toString).collect(Collectors.toList());
+    }
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoveryListCommand.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoveryListCommand.java
new file mode 100644
index 0000000..6efdaaa
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoveryListCommand.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.cli;
+
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
+
+@Service
+@Command(scope = "onos", name = "sr-pr-list", description = "List current recovery phase of each device")
+
+public class PhasedRecoveryListCommand extends AbstractShellCommand {
+    @Override
+    protected void doExecute() {
+        PhasedRecoveryService prService = get(PhasedRecoveryService.class);
+        print(prService.getPhases().toString());
+    }
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoverySetCommand.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoverySetCommand.java
new file mode 100644
index 0000000..50e3bc6
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PhasedRecoverySetCommand.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.cli;
+
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.cli.net.DeviceIdCompleter;
+import org.onosproject.net.DeviceId;
+import org.onosproject.segmentrouting.phasedrecovery.api.Phase;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
+
+@Service
+@Command(scope = "onos", name = "sr-pr-set", description = "Set recovery phase of given device")
+
+public class PhasedRecoverySetCommand extends AbstractShellCommand {
+    @Argument(index = 0, name = "deviceId",
+            description = "Device ID",
+            required = true, multiValued = false)
+    @Completion(DeviceIdCompleter.class)
+    private String deviceIdStr;
+
+    @Argument(index = 1, name = "phase",
+            description = "Recovery phase",
+            required = true, multiValued = false)
+    @Completion(PhaseCompleter.class)
+    private String phaseStr;
+
+    @Override
+    protected void doExecute() {
+        DeviceId deviceId = DeviceId.deviceId(deviceIdStr);
+        Phase newPhase = Phase.valueOf(phaseStr);
+
+        PhasedRecoveryService prService = get(PhasedRecoveryService.class);
+        prService.setPhase(deviceId, newPhase);
+    }
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PortsCommand.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PortsCommand.java
new file mode 100644
index 0000000..f24d28f
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/PortsCommand.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.cli;
+
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.cli.PlaceholderCompleter;
+import org.onosproject.cli.net.DeviceIdCompleter;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@Service
+@Command(scope = "onos", name = "sr-ports", description = "Enable/Disable group of ports on a specific device")
+
+public class PortsCommand extends AbstractShellCommand {
+    @Argument(index = 0, name = "deviceId",
+            description = "Device ID",
+            required = true, multiValued = false)
+    @Completion(DeviceIdCompleter.class)
+    private String deviceIdStr;
+
+    @Argument(index = 1, name = "ports",
+            description = "Ports to be enabled/disabled: ALL, PAIR, INFRA, EDGE",
+            required = true, multiValued = false)
+    @Completion(PlaceholderCompleter.class)
+    private String portsStr;
+
+    @Argument(index = 2, name = "action",
+            description = "Action: ENABLE, DISABLE",
+            required = true, multiValued = false)
+    @Completion(PlaceholderCompleter.class)
+    private String actionStr;
+
+    @Override
+    protected void doExecute() {
+        PhasedRecoveryService prService = get(PhasedRecoveryService.class);
+
+        DeviceId deviceId = DeviceId.deviceId(deviceIdStr);
+
+        boolean enabled;
+        switch (actionStr.toUpperCase()) {
+            case "ENABLE":
+                enabled = true;
+                break;
+            case "DISABLE":
+                enabled = false;
+                break;
+            default:
+                print("Action should be either ENABLE or DISABLE");
+                return;
+        }
+
+        Set<PortNumber> portsChanged;
+        switch (portsStr.toUpperCase()) {
+            case "ALL":
+                portsChanged = prService.changeAllPorts(deviceId, enabled);
+                break;
+            case "PAIR":
+                portsChanged = prService.changePairPort(deviceId, enabled);
+                break;
+            case "INFRA":
+                portsChanged = prService.changeInfraPorts(deviceId, enabled);
+                break;
+            case "EDGE":
+                portsChanged = prService.changeEdgePorts(deviceId, enabled);
+                break;
+            default:
+                print("Ports should be ALL, PAIR, INFRA, EDGE");
+                return;
+        }
+        print("Ports set to %s: %s",
+                enabled ? "enabled" : "disabled",
+                portsChanged.stream().map(PortNumber::toLong).collect(Collectors.toSet()));
+    }
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/OsgiPropertyConstants.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/OsgiPropertyConstants.java
new file mode 100644
index 0000000..cdeb8a2
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/OsgiPropertyConstants.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.phasedrecovery.api;
+
+/**
+ * Constants for default values of configurable properties.
+ */
+public final class OsgiPropertyConstants {
+    private OsgiPropertyConstants() {}
+
+    public static final String PROP_PHASED_RECOVERY = "phasedRecovery";
+    public static final boolean PHASED_RECOVERY_DEFAULT = false;
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/Phase.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/Phase.java
new file mode 100644
index 0000000..7f18685
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/Phase.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.phasedrecovery.api;
+
+/**
+ * Phases of recovering devices.
+ */
+public enum Phase {
+
+    /**
+     * Device is waiting for ports to be reported.
+     */
+    PENDING,
+
+    /**
+     * Pair port enabled. This is the initial state for paired devices.
+     */
+    PAIR,
+
+    /**
+     * Infrastructure ports enabled.
+     */
+    INFRA,
+
+    /**
+     * Edge ports enabled. This is the initial state for non-paired and spine devices.
+     */
+    EDGE
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/PhasedRecoveryService.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/PhasedRecoveryService.java
new file mode 100644
index 0000000..705ecb7
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/PhasedRecoveryService.java
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.phasedrecovery.api;
+
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Service that provides functionality related to phased recovery.
+ */
+public interface PhasedRecoveryService {
+
+    // TODO Make timeout values configurable via Component Config Service
+    /**
+     * Timeout for PAIR phase in seconds.
+     */
+    int PAIR_TIMEOUT = 30;
+
+    /**
+     * Timeout for INFRA phase in seconds.
+     */
+    int INFRA_TIMEOUT = 30;
+
+    /**
+     * Timeout for EDGE phase in seconds.
+     */
+    int EDGE_TIMEOUT = 30;
+
+    //
+    // Phased recovery APIs.
+    //
+
+
+    /**
+     * Returns true if phased recovery is enabled.
+     *
+     * @return true if phased recovery is enabled.
+     */
+    boolean isEnabled();
+
+    /**
+     * Initializes a device. Only the master of the device is allowed to do this.
+     *
+     * @param deviceId device ID
+     * @return true if the device is initialized successfully and the caller should proceed,
+     *         false if the device initialization has failed and the caller should abort.
+     */
+    boolean init(DeviceId deviceId);
+
+    /**
+     * Resets a device. Only the master of the device is allowed to do this.
+     *
+     * @param deviceId device ID
+     * @return true if the device is reset successfully.
+     *         false if the device has not been previously initialized.
+     */
+    boolean reset(DeviceId deviceId);
+
+    /**
+     * Gets recovery phase of every devices.
+     *
+     * @return a map between device ID and recovery phase
+     */
+    Map<DeviceId, Phase> getPhases();
+
+    /**
+     * Gets recovery phase of given device.
+     *
+     * @param deviceId device ID
+     * @return current phase or null if the device wasn't seen before
+     */
+    Phase getPhase(DeviceId deviceId);
+
+    /**
+     * Sets given device with given recovery phase. Only the master of the device is allowed to do this.
+     *
+     * @param deviceId device ID
+     * @param newPhase recovery phase
+     * @return new phase if transition succeeded, otherwise return current phase.
+     */
+    Phase setPhase(DeviceId deviceId, Phase newPhase);
+
+    //
+    // Port manipulation APIs.
+    //
+
+    /**
+     * Enables every ports on the given device.
+     *
+     * @param deviceId device id
+     * @param enabled true to enable, false to disable
+     * @return ports that have been enabled
+     */
+    Set<PortNumber> changeAllPorts(DeviceId deviceId, boolean enabled);
+
+    /**
+     * Enables pair port on the given device.
+     *
+     * @param deviceId device id
+     * @param enabled true to enable, false to disable
+     * @return ports that have been enabled
+     */
+    Set<PortNumber> changePairPort(DeviceId deviceId, boolean enabled);
+
+    /**
+     * Enables infrastructure ports on the given device.
+     *
+     * @param deviceId device id
+     * @param enabled true to enable, false to disable
+     * @return ports that have been enabled
+     */
+    Set<PortNumber> changeInfraPorts(DeviceId deviceId, boolean enabled);
+
+    /**
+     * Enables edge ports on the given device.
+     *
+     * @param deviceId device id
+     * @param enabled true to enable, false to disable
+     * @return ports that have been enabled
+     */
+    Set<PortNumber> changeEdgePorts(DeviceId deviceId, boolean enabled);
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/package-info.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/package-info.java
new file mode 100644
index 0000000..cc556be
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/api/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+/**
+ * Phased recovery API.
+ */
+package org.onosproject.segmentrouting.phasedrecovery.api;
\ No newline at end of file
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/PhasedRecoveryManager.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/PhasedRecoveryManager.java
new file mode 100644
index 0000000..5e25015
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/PhasedRecoveryManager.java
@@ -0,0 +1,383 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.phasedrecovery.impl;
+
+import com.google.common.collect.Sets;
+import org.onlab.util.KryoNamespace;
+import org.onlab.util.Tools;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.device.DeviceAdminService;
+import org.onosproject.segmentrouting.SegmentRoutingService;
+import org.onosproject.segmentrouting.phasedrecovery.api.Phase;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
+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.onosproject.store.service.Versioned;
+import org.osgi.service.component.ComponentContext;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Modified;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Dictionary;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.segmentrouting.phasedrecovery.api.OsgiPropertyConstants.PHASED_RECOVERY_DEFAULT;
+import static org.onosproject.segmentrouting.phasedrecovery.api.OsgiPropertyConstants.PROP_PHASED_RECOVERY;
+
+@Component(
+        immediate = true,
+        service = PhasedRecoveryService.class,
+        property = {
+                PROP_PHASED_RECOVERY + ":Boolean=" + PHASED_RECOVERY_DEFAULT
+        }
+)
+public class PhasedRecoveryManager implements PhasedRecoveryService {
+    private static final Logger log = LoggerFactory.getLogger(PhasedRecoveryManager.class);
+    private static final String APP_NAME = "org.onosproject.phasedrecovery";
+
+    // TODO Make these configurable via Component Config
+    // Amount of time delayed to wait for port description (in second)
+    private static final int PORT_CHECKER_INTERVAL = 1;
+    // Max number of retry for port checker
+    private static final int PORT_CHECKER_RETRIES = 5;
+    // RoutingStableChecker interval (in second)
+    private static final int ROUTING_CHECKER_DELAY = 3;
+    // RoutingStableChecker timeout (in second)
+    private static final int ROUTING_CHECKER_TIMEOUT = 15;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    private CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    private ComponentConfigService compCfgService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    private DeviceAdminService deviceAdminService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    private MastershipService mastershipService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    private StorageService storageService;
+
+    @Reference(cardinality = ReferenceCardinality.OPTIONAL)
+    volatile SegmentRoutingService srService;
+
+    /** Enabling phased recovery. */
+    boolean phasedRecovery = PHASED_RECOVERY_DEFAULT;
+
+    private ApplicationId appId;
+    private ConsistentMap<DeviceId, Phase> phasedRecoveryStore;
+    private ScheduledExecutorService executor = Executors.newScheduledThreadPool(
+            Runtime.getRuntime().availableProcessors(), groupedThreads("onos/sr/pr", "executor"));
+
+    @Activate
+    protected void activate(ComponentContext context) {
+        appId = coreService.registerApplication(APP_NAME);
+
+        KryoNamespace.Builder serializer = KryoNamespace.newBuilder()
+                .register(KryoNamespaces.API)
+                .register(Phase.class);
+        phasedRecoveryStore = storageService.<DeviceId, Phase>consistentMapBuilder()
+                .withName("onos-sr-phasedrecovery")
+                .withRelaxedReadConsistency()
+                .withSerializer(Serializer.using(serializer.build()))
+                .build();
+
+        compCfgService.registerProperties(getClass());
+        modified(context);
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        phasedRecoveryStore.destroy();
+        compCfgService.unregisterProperties(getClass(), false);
+        log.info("Stopped");
+    }
+
+    @Modified
+    protected void modified(ComponentContext context) {
+        Dictionary<?, ?> properties = context.getProperties();
+        if (properties == null) {
+            return;
+        }
+
+        String strPhasedRecovery = Tools.get(properties, PROP_PHASED_RECOVERY);
+        boolean expectPhasedRecovery = Boolean.parseBoolean(strPhasedRecovery);
+        if (expectPhasedRecovery != phasedRecovery) {
+            phasedRecovery = expectPhasedRecovery;
+            log.info("{} phased recovery", phasedRecovery ? "Enabling" : "Disabling");
+        }
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return phasedRecovery;
+    }
+
+    @Override
+    public boolean init(DeviceId deviceId) {
+        if (this.srService == null) {
+            log.info("SegmentRoutingService is not ready");
+            return false;
+        }
+        if (!mastershipService.isLocalMaster(deviceId)) {
+            log.info("Not master of {}", deviceId);
+            return false;
+        }
+
+        Phase phase = Optional.ofNullable(phasedRecoveryStore.putIfAbsent(deviceId, Phase.PENDING))
+                .map(Versioned::value).orElse(null);
+
+        if (phase != null) {
+            log.info("{} has been initialized already. Skipping.", deviceId);
+            return false;
+        } else {
+            Phase nextPhase = (phasedRecovery && this.srService.getPairDeviceId(deviceId).isPresent()) ?
+                    Phase.PAIR : Phase.EDGE;
+            if (nextPhase == Phase.PAIR) {
+                // Wait for the PORT_STAT before entering next phase.
+                // Note: Unlikely, when the device init fails due to PORT_STATS timeout,
+                //       it requires operator to manually move the device to the next phase by CLI command.
+                executor.schedule(new PortChecker(deviceId, PORT_CHECKER_RETRIES),
+                        PORT_CHECKER_INTERVAL, TimeUnit.SECONDS);
+            } else {
+                // We assume that all ports will be reported as enabled on devices that don't require phased recovery
+                setPhase(deviceId, Phase.EDGE);
+            }
+            return true;
+        }
+    }
+
+    @Override
+    public boolean reset(DeviceId deviceId) {
+        if (this.srService == null) {
+            log.info("SegmentRoutingService is not ready");
+            return false;
+        }
+        // FIXME Skip mastership checking since master will not be available when a device goes offline
+        //       Improve this when persistent mastership is introduced
+
+        Phase result = Optional.ofNullable(phasedRecoveryStore.remove(deviceId))
+                .map(Versioned::value).orElse(null);
+        if (result != null) {
+            log.info("{} is reset", deviceId);
+        }
+        return result != null;
+    }
+
+    @Override
+    public Map<DeviceId, Phase> getPhases() {
+        return phasedRecoveryStore.asJavaMap();
+    }
+
+    @Override
+    public Phase getPhase(DeviceId deviceId) {
+        return Optional.ofNullable(phasedRecoveryStore.get(deviceId)).map(Versioned::value).orElse(null);
+    }
+
+    @Override
+    public Phase setPhase(DeviceId deviceId, Phase newPhase) {
+        if (this.srService == null) {
+            log.info("SegmentRoutingService is not ready");
+            return null;
+        }
+        if (!mastershipService.isLocalMaster(deviceId)) {
+            log.info("Not master of {}", deviceId);
+            return null;
+        }
+
+        return Optional.ofNullable(phasedRecoveryStore.compute(deviceId, (k, v) -> {
+            if (v == null && newPhase == Phase.PENDING) {
+                log.info("Initializing {}", deviceId);
+                return newPhase;
+            } else if (v == Phase.PENDING && newPhase == Phase.PAIR) {
+                srService.initHost(deviceId);
+                // RouteHandler init is intentionally skipped when phased recovery is on.
+                // Edge ports remain down in this phase. Therefore, no nexthop will be discovered on the given device.
+                // The flow on given device will be programmed later by hostHandler.processHostMovedEvent()
+                changePairPort(deviceId, true);
+                log.info("Transitioning {} from PENDING to PAIR", deviceId);
+                return newPhase;
+            } else if (v == Phase.PAIR && newPhase == Phase.INFRA) {
+                changeInfraPorts(deviceId, true);
+                srService.initRoute(deviceId);
+                log.info("Transitioning {} from PAIR to INFRA", deviceId);
+                monitorRoutingStability(deviceId);
+                return newPhase;
+            } else if (v == Phase.INFRA && newPhase == Phase.EDGE) {
+                changeEdgePorts(deviceId, true);
+                log.info("Transitioning {} from INFRA to EDGE", deviceId);
+                return newPhase;
+            } else if (v == Phase.PENDING && newPhase == Phase.EDGE) {
+                changeAllPorts(deviceId, true);
+                srService.initHost(deviceId);
+                srService.initRoute(deviceId);
+                log.info("Transitioning {} from PENDING to EDGE", deviceId);
+                return newPhase;
+            } else {
+                log.debug("Ignore illegal state transition on {} from {} to {}", deviceId, v, newPhase);
+                return v;
+            }
+        })).map(Versioned::value).orElse(null);
+    }
+
+    private void monitorRoutingStability(DeviceId deviceId) {
+        CompletableFuture<Void> checkerFuture = new CompletableFuture<>();
+        CompletableFuture<Void> timeoutFuture =
+                Tools.completeAfter(ROUTING_CHECKER_TIMEOUT, TimeUnit.SECONDS);
+        RoutingStabilityChecker checker = new RoutingStabilityChecker(checkerFuture);
+
+        checkerFuture.runAfterEitherAsync(timeoutFuture, () -> {
+            if (checkerFuture.isDone()) {
+                log.info("Routing stable. Move {} to the next phase", deviceId);
+            } else {
+                log.info("Timeout reached. Move {} to the next phase", deviceId);
+                // Mark the future as completed to signify the termination of periodical checker
+                checkerFuture.complete(null);
+            }
+            setPhase(deviceId, Phase.EDGE);
+        });
+
+        executor.schedule(checker, ROUTING_CHECKER_DELAY, TimeUnit.SECONDS);
+    }
+
+    @Override
+    public Set<PortNumber> changeAllPorts(DeviceId deviceId, boolean enabled) {
+        if (this.srService == null) {
+            log.warn("SegmentRoutingService is not ready. Unable to changeAllPorts({}) to {}", deviceId, enabled);
+            return Sets.newHashSet();
+        }
+        Set<PortNumber> portsToBeEnabled = deviceAdminService.getPorts(deviceId)
+                .stream().map(Port::number).collect(Collectors.toSet());
+        changePorts(deviceId, portsToBeEnabled, enabled);
+        return portsToBeEnabled;
+    }
+
+    @Override
+    public Set<PortNumber> changePairPort(DeviceId deviceId, boolean enabled) {
+        if (this.srService == null) {
+            log.warn("SegmentRoutingService is not ready. Unable to changePairPort({}) to {}", deviceId, enabled);
+            return Sets.newHashSet();
+        }
+        Set<PortNumber> portsToBeEnabled = this.srService.getPairLocalPort(deviceId)
+                .map(Sets::newHashSet).orElse(Sets.newHashSet());
+        changePorts(deviceId, portsToBeEnabled, enabled);
+        return portsToBeEnabled;
+    }
+
+    @Override
+    public Set<PortNumber> changeInfraPorts(DeviceId deviceId, boolean enabled) {
+        if (this.srService == null) {
+            log.warn("SegmentRoutingService is not ready. Unable to changeInfraPorts({}) to {}", deviceId, enabled);
+            return Sets.newHashSet();
+        }
+        Set<PortNumber> portsToBeEnabled = this.srService.getInfraPorts(deviceId);
+        changePorts(deviceId, portsToBeEnabled, enabled);
+        return portsToBeEnabled;
+    }
+
+    @Override
+    public Set<PortNumber> changeEdgePorts(DeviceId deviceId, boolean enabled) {
+        if (this.srService == null) {
+            log.warn("SegmentRoutingService is not ready. Unable to changeEdgePorts({}) to {}", deviceId, enabled);
+            return Sets.newHashSet();
+        }
+        Set<PortNumber> portsToBeEnabled = this.srService.getEdgePorts(deviceId);
+        changePorts(deviceId, portsToBeEnabled, enabled);
+        return portsToBeEnabled;
+    }
+
+    private void changePorts(DeviceId deviceId, Set<PortNumber> portNumbers, boolean enabled) {
+        log.info("{} {} on {}", enabled ? "Enabled" : "Disabled", portNumbers, deviceId);
+        portNumbers.forEach(portNumber ->
+            deviceAdminService.changePortState(deviceId, portNumber, enabled));
+    }
+
+    private class PortChecker implements Runnable {
+        int retries;
+        DeviceId deviceId;
+
+        PortChecker(DeviceId deviceId, int retries) {
+            this.deviceId = deviceId;
+            this.retries = retries;
+        }
+
+        @Override
+        public void run() {
+            retries -= 1;
+            if (retries < 0) {
+                log.warn("PORT_STATS timeout. Unable to initialize {}", deviceId);
+                return;
+            }
+
+            if (!deviceAdminService.getPorts(deviceId).isEmpty()) {
+                log.info("{} reported PORT_STATS", deviceId);
+                setPhase(deviceId, Phase.PAIR);
+            }
+            log.info("{} still waiting for PORT_STATS", deviceId);
+            executor.schedule(this, PORT_CHECKER_INTERVAL, TimeUnit.SECONDS);
+        }
+    }
+
+    private class RoutingStabilityChecker implements Runnable {
+        private final CompletableFuture<Void> future;
+
+        RoutingStabilityChecker(CompletableFuture<Void> future) {
+            this.future = future;
+        }
+
+        @Override
+        public void run() {
+            // Do not continue if the future has been completed
+            if (future.isDone()) {
+                log.trace("RouteStabilityChecker is done. Stop checking");
+                return;
+            }
+
+            if (srService.isRoutingStable()) {
+                log.trace("Routing is stable");
+                future.complete(null);
+            } else {
+                log.trace("Routing is not yet stable");
+                executor.schedule(this, ROUTING_CHECKER_DELAY, TimeUnit.SECONDS);
+            }
+        }
+    }
+}
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/package-info.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/package-info.java
new file mode 100644
index 0000000..3788085
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/phasedrecovery/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+/**
+ * Phased recovery implementation.
+ */
+package org.onosproject.segmentrouting.phasedrecovery.impl;
\ No newline at end of file
diff --git a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/HostHandlerTest.java b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/HostHandlerTest.java
index dedd66f..d67cb07 100644
--- a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/HostHandlerTest.java
+++ b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/HostHandlerTest.java
@@ -59,6 +59,7 @@
 
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.CompletableFuture;
 
 import static org.easymock.EasyMock.createMock;
 import static org.easymock.EasyMock.createNiceMock;
@@ -569,10 +570,12 @@
 
         // Host moved from [1A/1, 1B/1] to [1A/2, 1B/1]
         // We should expect only one bridging flow and one routing flow programmed on 1A
-        mockDefaultRoutingHandler.populateBridging(DEV3, P2, HOST_MAC, HOST_VLAN_UNTAGGED);
-        expectLastCall().times(1);
-        mockDefaultRoutingHandler.populateRoute(DEV3, HOST_IP11.toIpPrefix(), HOST_MAC, HOST_VLAN_UNTAGGED, P2, true);
-        expectLastCall().times(1);
+
+        expect(mockDefaultRoutingHandler.populateBridging(DEV3, P2, HOST_MAC, HOST_VLAN_UNTAGGED))
+                .andReturn(CompletableFuture.completedFuture(null)).once();
+        expect(mockDefaultRoutingHandler.populateRoute(DEV3, HOST_IP11.toIpPrefix(),
+                HOST_MAC, HOST_VLAN_UNTAGGED, P2, true))
+                .andReturn(CompletableFuture.completedFuture(null)).once();
         replay(mockDefaultRoutingHandler);
 
         hostHandler.processHostMovedEvent(new HostEvent(HostEvent.Type.HOST_MOVED, host2, host1));
diff --git a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockFlowObjectiveService.java b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockFlowObjectiveService.java
index 138b98a..0f2d7a9 100644
--- a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockFlowObjectiveService.java
+++ b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockFlowObjectiveService.java
@@ -31,6 +31,7 @@
 import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
 import org.onosproject.net.flowobjective.ForwardingObjective;
 import org.onosproject.net.flowobjective.Objective;
+import org.onosproject.net.flowobjective.ObjectiveError;
 
 import java.util.Map;
 
@@ -72,9 +73,13 @@
 
         if (op.equals(Objective.Operation.ADD)) {
             bridgingTable.put(btKey, btValue);
+            forwardingObjective.context().ifPresent(context -> context.onSuccess(forwardingObjective));
         } else if (op.equals(Objective.Operation.REMOVE)) {
             bridgingTable.remove(btKey, btValue);
+            forwardingObjective.context().ifPresent(context -> context.onSuccess(forwardingObjective));
         } else {
+            forwardingObjective.context().ifPresent(context ->
+                    context.onError(forwardingObjective, ObjectiveError.UNKNOWN));
             throw new IllegalArgumentException();
         }
     }
diff --git a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockRoutingRulePopulator.java b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockRoutingRulePopulator.java
index 77eeed2..4d222d8 100644
--- a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockRoutingRulePopulator.java
+++ b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/MockRoutingRulePopulator.java
@@ -21,8 +21,10 @@
 import org.onlab.packet.VlanId;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.PortNumber;
+import org.onosproject.net.flowobjective.Objective;
 
 import java.util.Map;
+import java.util.concurrent.CompletableFuture;
 
 /**
  * Mock Routing Rule Populator.
@@ -37,18 +39,20 @@
     }
 
     @Override
-    public void populateRoute(DeviceId deviceId, IpPrefix prefix,
-                              MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
+    public CompletableFuture<Objective> populateRoute(DeviceId deviceId, IpPrefix prefix, MacAddress hostMac,
+                                                      VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         MockRoutingTableKey rtKey = new MockRoutingTableKey(deviceId, prefix);
         MockRoutingTableValue rtValue = new MockRoutingTableValue(outPort, hostMac, hostVlanId);
         routingTable.put(rtKey, rtValue);
+        return CompletableFuture.completedFuture(null);
     }
 
     @Override
-    public void revokeRoute(DeviceId deviceId, IpPrefix prefix,
+    public CompletableFuture<Objective> revokeRoute(DeviceId deviceId, IpPrefix prefix,
                             MacAddress hostMac, VlanId hostVlanId, PortNumber outPort, boolean directHost) {
         MockRoutingTableKey rtKey = new MockRoutingTableKey(deviceId, prefix);
         MockRoutingTableValue rtValue = new MockRoutingTableValue(outPort, hostMac, hostVlanId);
         routingTable.remove(rtKey, rtValue);
+        return CompletableFuture.completedFuture(null);
     }
 }
diff --git a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
index 6332856..f2a439b 100644
--- a/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
+++ b/apps/segmentrouting/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
@@ -39,6 +39,7 @@
 import org.onosproject.net.flow.TrafficTreatment;
 import org.onosproject.net.host.HostEvent;
 import org.onosproject.net.host.HostService;
+import org.onosproject.net.host.InterfaceIpAddress;
 import org.onosproject.net.intf.Interface;
 import org.onosproject.net.provider.ProviderId;
 import org.onosproject.routeservice.ResolvedRoute;
@@ -46,6 +47,7 @@
 import org.onosproject.routeservice.RouteEvent;
 import org.onosproject.segmentrouting.config.DeviceConfiguration;
 import org.onosproject.segmentrouting.config.SegmentRoutingDeviceConfig;
+import org.onosproject.segmentrouting.phasedrecovery.api.PhasedRecoveryService;
 import org.onosproject.store.service.StorageService;
 import org.onosproject.store.service.TestConsistentMap;
 import org.onosproject.store.service.TestConsistentMultimap;
@@ -82,15 +84,17 @@
     private static final IpPrefix P1 = IpPrefix.valueOf("10.0.0.0/24");
 
     // Single homed router 1
-    private static final IpAddress N1 = IpAddress.valueOf("10.0.1.254");
+    private static final IpAddress N1 = IpAddress.valueOf("10.0.1.1");
     private static final MacAddress M1 = MacAddress.valueOf("00:00:00:00:00:01");
     private static final VlanId V1 = VlanId.vlanId((short) 1);
     private static final ConnectPoint CP1 = ConnectPoint.deviceConnectPoint("of:0000000000000001/1");
     private static final Route R1 = new Route(Route.Source.STATIC, P1, N1);
     private static final ResolvedRoute RR1 = new ResolvedRoute(R1, M1, V1);
+    private static final Route DHCP_R1 = new Route(Route.Source.DHCP, P1, N1);
+    private static final ResolvedRoute DHCP_RR1 = new ResolvedRoute(DHCP_R1, M1, V1);
 
     // Single homed router 2
-    private static final IpAddress N2 = IpAddress.valueOf("10.0.2.254");
+    private static final IpAddress N2 = IpAddress.valueOf("10.0.2.1");
     private static final MacAddress M2 = MacAddress.valueOf("00:00:00:00:00:02");
     private static final VlanId V2 = VlanId.vlanId((short) 2);
     private static final ConnectPoint CP2 = ConnectPoint.deviceConnectPoint("of:0000000000000002/2");
@@ -98,14 +102,16 @@
     private static final ResolvedRoute RR2 = new ResolvedRoute(R2, M2, V2);
 
     // Dual homed router 1
-    private static final IpAddress N3 = IpAddress.valueOf("10.0.3.254");
+    private static final IpAddress N3 = IpAddress.valueOf("10.0.3.1");
     private static final MacAddress M3 = MacAddress.valueOf("00:00:00:00:00:03");
     private static final VlanId V3 = VlanId.vlanId((short) 3);
     private static final Route R3 = new Route(Route.Source.STATIC, P1, N3);
     private static final ResolvedRoute RR3 = new ResolvedRoute(R3, M3, V3);
+    private static final Route DHCP_R3 = new Route(Route.Source.DHCP, P1, N3);
+    private static final ResolvedRoute DHCP_RR3 = new ResolvedRoute(DHCP_R3, M3, V3);
 
     // Single homed router 3
-    private static final IpAddress N4 = IpAddress.valueOf("10.0.4.254");
+    private static final IpAddress N4 = IpAddress.valueOf("10.0.4.1");
     private static final MacAddress M4 = MacAddress.valueOf("00:00:00:00:00:04");
     private static final VlanId V4 = VlanId.vlanId((short) 4);
     private static final ConnectPoint CP4 = ConnectPoint.deviceConnectPoint("of:0000000000000004/4");
@@ -134,7 +140,15 @@
     // A set of devices of which we have mastership
     private static final Set<DeviceId> LOCAL_DEVICES = Sets.newHashSet(CP1.deviceId(), CP2.deviceId());
     // A set of interfaces
-    private static final Set<Interface> INTERFACES = Sets.newHashSet();
+    private static final InterfaceIpAddress IF_IP1 =
+            new InterfaceIpAddress(IpAddress.valueOf("10.0.1.254"), IpPrefix.valueOf("10.0.1.254/24"));
+    private static final InterfaceIpAddress IF_IP3 =
+            new InterfaceIpAddress(IpAddress.valueOf("10.0.3.254"), IpPrefix.valueOf("10.0.3.254/24"));
+    private static final Interface IF_CP1 = new Interface("if-cp1", CP1, Lists.newArrayList(IF_IP1, IF_IP3),
+            null, null, null, null, null);
+    private static final Interface IF_CP2 = new Interface("if-cp2", CP2, Lists.newArrayList(IF_IP1, IF_IP3),
+            null, null, null, null, null);
+    private static final Set<Interface> INTERFACES = Sets.newHashSet(IF_CP1, IF_CP2);
 
     @Before
     public void setUp() {
@@ -173,6 +187,9 @@
         srManager.hostService = hostService;
         srManager.cfgService = mockNetworkConfigRegistry;
         srManager.routeService = new MockRouteService(ROUTE_STORE);
+        srManager.phasedRecoveryService = createMock(PhasedRecoveryService.class);
+        expect(srManager.phasedRecoveryService.isEnabled()).andReturn(true).anyTimes();
+        replay(srManager.phasedRecoveryService);
 
         routeHandler = new RouteHandler(srManager);
 
@@ -194,7 +211,6 @@
         assertEquals(CP1.port(), rtv1.portNumber);
 
         assertEquals(1, SUBNET_TABLE.size());
-        assertTrue(SUBNET_TABLE.get(CP1).contains(P1));
     }
 
     @Test
@@ -214,8 +230,46 @@
         assertEquals(CP2.port(), rtv2.portNumber);
 
         assertEquals(2, SUBNET_TABLE.size());
-        assertTrue(SUBNET_TABLE.get(CP1).contains(P1));
-        assertTrue(SUBNET_TABLE.get(CP2).contains(P1));
+    }
+
+    // Only one of two dual-homed next hops present.
+    // Expect one routing table to be programmed with direct flow.
+    // The other is not programmed, not even for subnet
+    @Test
+    public void initDhcpRouteSingleDualHomeNextHop() {
+        ROUTE_STORE.put(P1, Sets.newHashSet(DHCP_RR1));
+
+        routeHandler.init(CP1.deviceId());
+
+        assertEquals(1, ROUTING_TABLE.size());
+        MockRoutingTableValue rtv1 = ROUTING_TABLE.get(new MockRoutingTableKey(CP1.deviceId(), P1));
+        assertEquals(M1, rtv1.macAddress);
+        assertEquals(V1, rtv1.vlanId);
+        assertEquals(CP1.port(), rtv1.portNumber);
+
+        assertEquals(1, SUBNET_TABLE.size());
+    }
+
+    // Both dual-homed next hops present.
+    // Expect both routing table to be programmed with direct flow
+    @Test
+    public void initDhcpRouteBothDualHomeNextHop() {
+        ROUTE_STORE.put(P1, Sets.newHashSet(DHCP_RR3));
+
+        routeHandler.init(CP1.deviceId());
+
+        assertEquals(2, ROUTING_TABLE.size());
+        MockRoutingTableValue rtv1 = ROUTING_TABLE.get(new MockRoutingTableKey(CP1.deviceId(), P1));
+        assertEquals(M3, rtv1.macAddress);
+        assertEquals(V3, rtv1.vlanId);
+        assertEquals(CP1.port(), rtv1.portNumber);
+
+        MockRoutingTableValue rtv2 = ROUTING_TABLE.get(new MockRoutingTableKey(CP2.deviceId(), P1));
+        assertEquals(M3, rtv2.macAddress);
+        assertEquals(V3, rtv2.vlanId);
+        assertEquals(CP2.port(), rtv2.portNumber);
+
+        assertEquals(2, SUBNET_TABLE.size());
     }
 
     @Test
diff --git a/tools/package/runtime/bin/onos-diagnostics b/tools/package/runtime/bin/onos-diagnostics
index 0daa320..655bb40 100755
--- a/tools/package/runtime/bin/onos-diagnostics
+++ b/tools/package/runtime/bin/onos-diagnostics
@@ -118,6 +118,7 @@
     "sr-next-pw"
     "sr-next-xconnect"
     "sr-next-mac-vlan"
+    "sr-pr-list"
     "dhcp-relay"
 
     "mcast-host-routes"
diff --git a/utils/misc/src/main/java/org/onlab/util/PredictableExecutor.java b/utils/misc/src/main/java/org/onlab/util/PredictableExecutor.java
index 279091c..b18a2fb 100644
--- a/utils/misc/src/main/java/org/onlab/util/PredictableExecutor.java
+++ b/utils/misc/src/main/java/org/onlab/util/PredictableExecutor.java
@@ -28,6 +28,7 @@
 import java.util.Objects;
 import java.util.concurrent.AbstractExecutorService;
 import java.util.concurrent.Callable;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.FutureTask;
@@ -136,6 +137,35 @@
         execute(command, hintFunction.apply(command));
     }
 
+    /**
+     * Submits a value-returning task for execution and returns a
+     * Future representing the pending results of the task. The
+     * Future's {@code get} method will return the task's result upon
+     * successful completion.
+     *
+     * @param command the {@link Runnable} task
+     * @param hint value to pick thread to run on.
+     * @return completable future representing the pending results
+     */
+    public CompletableFuture<Void> submit(Runnable command, int hint) {
+        int index = Math.abs(hint) % backends.size();
+        return CompletableFuture.runAsync(command, backends.get(index));
+    }
+
+    /**
+     * Submits a value-returning task for execution and returns a
+     * Future representing the pending results of the task. The
+     * Future's {@code get} method will return the task's result upon
+     * successful completion.
+     *
+     * @param command the {@link Runnable} task
+     * @param hintFunction Function to compute hint value
+     * @return completable future representing the pending results
+     */
+    public CompletableFuture<Void> submit(Runnable command, Function<Runnable, Integer> hintFunction) {
+        int hint = hintFunction.apply(command);
+        return submit(command, hint);
+    }
 
     private static int hint(Runnable command) {
         if (command instanceof PickyTask) {
diff --git a/utils/misc/src/main/java/org/onlab/util/Tools.java b/utils/misc/src/main/java/org/onlab/util/Tools.java
index e0ea0d5..596e34b 100644
--- a/utils/misc/src/main/java/org/onlab/util/Tools.java
+++ b/utils/misc/src/main/java/org/onlab/util/Tools.java
@@ -49,7 +49,9 @@
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -80,6 +82,9 @@
 
     private static final String INPUT_JSON_CANNOT_BE_NULL = "Input JSON cannot be null";
 
+    private static ScheduledExecutorService timer = Executors.newScheduledThreadPool(
+            Runtime.getRuntime().availableProcessors(), groupedThreads("onos/tool", "timer"));
+
     /**
      * Returns a thread factory that produces threads named according to the
      * supplied name pattern.
@@ -699,6 +704,19 @@
     }
 
     /**
+     * Returns a future that completes normally after given time period.
+     *
+     * @param timeout amount of time to wait before completing the future
+     * @param unit Time unit
+     * @return a future that completes after given time period
+     */
+    public static CompletableFuture<Void> completeAfter(long timeout, TimeUnit unit) {
+        CompletableFuture<Void> result = new CompletableFuture<>();
+        timer.schedule(() -> result.complete(null), timeout, unit);
+        return result;
+    }
+
+    /**
      * Returns a future that's completed using the given {@code orderedExecutor} if the future is not blocked or the
      * given {@code threadPoolExecutor} if the future is blocked.
      * <p>