diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
index 5014811..9844106 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/DefaultRoutingHandler.java
@@ -191,29 +191,29 @@
             updatedEcmpSpgMap = new HashMap<>();
             Set<EdgePair> edgePairs = new HashSet<>();
             Set<ArrayList<DeviceId>> routeChanges = new HashSet<>();
-            for (Device dstSw : srManager.deviceService.getDevices()) {
+            for (DeviceId dstSw : srManager.deviceConfiguration.getRouters()) {
                 EcmpShortestPathGraph ecmpSpgUpdated =
-                        new EcmpShortestPathGraph(dstSw.id(), srManager);
-                updatedEcmpSpgMap.put(dstSw.id(), ecmpSpgUpdated);
-                DeviceId pairDev = getPairDev(dstSw.id());
+                        new EcmpShortestPathGraph(dstSw, srManager);
+                updatedEcmpSpgMap.put(dstSw, ecmpSpgUpdated);
+                DeviceId pairDev = getPairDev(dstSw);
                 if (pairDev != null) {
                     // pairDev may not be available yet, but we still need to add
                     ecmpSpgUpdated = new EcmpShortestPathGraph(pairDev, srManager);
                     updatedEcmpSpgMap.put(pairDev, ecmpSpgUpdated);
-                    edgePairs.add(new EdgePair(dstSw.id(), pairDev));
+                    edgePairs.add(new EdgePair(dstSw, pairDev));
                 }
-                DeviceId ret = shouldHandleRouting(dstSw.id());
+                DeviceId ret = shouldHandleRouting(dstSw);
                 if (ret == null) {
                     continue;
                 }
-                Set<DeviceId> devsToProcess = Sets.newHashSet(dstSw.id(), ret);
+                Set<DeviceId> devsToProcess = Sets.newHashSet(dstSw, ret);
                 // To do a full reroute, assume all routes have changed
                 for (DeviceId dev : devsToProcess) {
-                    for (Device targetSw : srManager.deviceService.getDevices()) {
-                        if (targetSw.id().equals(dev)) {
+                    for (DeviceId targetSw : srManager.deviceConfiguration.getRouters()) {
+                        if (targetSw.equals(dev)) {
                             continue;
                         }
-                        routeChanges.add(Lists.newArrayList(targetSw.id(), dev));
+                        routeChanges.add(Lists.newArrayList(targetSw, dev));
                     }
                 }
             }
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
index 1d1cc4e..a9c2f04 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
@@ -15,23 +15,11 @@
  */
 package org.onosproject.segmentrouting;
 
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.concurrent.Executors;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.stream.Collectors;
-
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
 import com.google.common.collect.Sets;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
@@ -121,10 +109,21 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.google.common.collect.HashMultimap;
-import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Multimap;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
 
 import static com.google.common.base.Preconditions.checkState;
 import static org.onlab.packet.Ethernet.TYPE_ARP;
@@ -581,9 +580,8 @@
     @Override
     public Map<DeviceId, Set<IpPrefix>> getDeviceSubnetMap() {
         Map<DeviceId, Set<IpPrefix>> deviceSubnetMap = Maps.newHashMap();
-        deviceService.getAvailableDevices().forEach(device -> {
-            deviceSubnetMap.put(device.id(), deviceConfiguration.getSubnets(device.id()));
-        });
+        deviceConfiguration.getRouters().forEach(device ->
+            deviceSubnetMap.put(device, deviceConfiguration.getSubnets(device)));
         return deviceSubnetMap;
     }
 
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
index 321cf40..b7d32a1 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
@@ -27,18 +27,19 @@
 import org.onlab.packet.IpPrefix;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
-import org.onosproject.net.config.ConfigException;
-import org.onosproject.net.config.basics.InterfaceConfig;
-import org.onosproject.net.intf.Interface;
 import org.onosproject.net.ConnectPoint;
-import org.onosproject.net.host.InterfaceIpAddress;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.PortNumber;
+import org.onosproject.net.config.ConfigException;
+import org.onosproject.net.config.basics.InterfaceConfig;
+import org.onosproject.net.host.InterfaceIpAddress;
+import org.onosproject.net.intf.Interface;
 import org.onosproject.segmentrouting.SegmentRoutingManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -126,7 +127,9 @@
         // Read gatewayIps and subnets from port subject. Ignore suppressed ports.
         Set<ConnectPoint> portSubjects = srManager.cfgService
                 .getSubjects(ConnectPoint.class, InterfaceConfig.class);
-        portSubjects.stream().filter(subject -> !isSuppressedPort(subject)).forEach(subject -> {
+        portSubjects.stream()
+                .filter(subject -> deviceConfigMap.containsKey(subject.deviceId()))
+                .filter(subject -> !isSuppressedPort(subject)).forEach(subject -> {
             InterfaceConfig config =
                     srManager.cfgService.getConfig(subject, InterfaceConfig.class);
             Set<Interface> networkInterfaces;
@@ -181,6 +184,9 @@
         });
     }
 
+    public Collection<DeviceId> getRouters() {
+        return deviceConfigMap.keySet();
+    }
 
     @Override
     public boolean isConfigured(DeviceId deviceId) {