diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
index 01a574d..456019a 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
@@ -30,7 +30,6 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-import static org.onosproject.cli.AbstractShellCommand.get;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.modelEntityToJson;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.prettyJson;
 
@@ -53,7 +52,7 @@
         if (outputJson()) {
             print("%s", json(networks));
         } else {
-            print(FORMAT, "ID", "Name", "Network Mode", "SegId", "Subnets", "HostRoutes");
+            print(FORMAT, "ID", "Name", "Type", "SegId", "Subnets", "HostRoutes");
             for (Network net: networks) {
                 List<Subnet> subnets = service.subnets().stream()
                         .filter(subnet -> subnet.getNetworkId().equals(net.getId()))
@@ -71,7 +70,7 @@
 
                 print(FORMAT, net.getId(),
                         net.getName(),
-                        net.getNetworkType().toString(),
+                        service.networkType(net.getId()).toString(),
                         net.getProviderSegID(),
                         subnets.isEmpty() ? "" : subnetsString,
                         hostRoutes.isEmpty() ? "" : hostRoutes);
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DefaultOpenstackNetwork.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DefaultOpenstackNetwork.java
new file mode 100644
index 0000000..124f912
--- /dev/null
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DefaultOpenstackNetwork.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2019-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.openstacknetworking.impl;
+
+import com.google.common.base.MoreObjects;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork;
+
+import java.util.Objects;
+
+/**
+ * Default implementation of augmented network.
+ */
+public final class DefaultOpenstackNetwork implements OpenstackNetwork {
+
+    private final String networkId;
+    private final Type type;
+
+    /**
+     * A default constructor for openstack network implementation class.
+     *
+     * @param networkId network ID
+     * @param type      network type
+     */
+    public DefaultOpenstackNetwork(String networkId, Type type) {
+        this.networkId = networkId;
+        this.type = type;
+    }
+
+    @Override
+    public String networkId() {
+        return networkId;
+    }
+
+    @Override
+    public Type type() {
+        return type;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("networkId", networkId)
+                .add("type", type)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DefaultOpenstackNetwork) {
+            DefaultOpenstackNetwork that = (DefaultOpenstackNetwork) obj;
+            return Objects.equals(networkId, that.networkId) &&
+                    Objects.equals(type, that.type);
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(networkId, type);
+    }
+}
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
index e7cda54..98bd413 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkManager.java
@@ -35,6 +35,8 @@
 import org.onosproject.net.packet.PacketService;
 import org.onosproject.openstacknetworking.api.Constants;
 import org.onosproject.openstacknetworking.api.ExternalPeerRouter;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkAdminService;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkEvent;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkListener;
@@ -47,11 +49,10 @@
 import org.onosproject.store.service.ConsistentMap;
 import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.StorageService;
-import org.openstack4j.model.common.IdEntity;
+import org.onosproject.store.service.Versioned;
 import org.openstack4j.model.network.ExternalGateway;
 import org.openstack4j.model.network.IP;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Port;
 import org.openstack4j.model.network.Router;
 import org.openstack4j.model.network.Subnet;
@@ -63,6 +64,7 @@
 import org.slf4j.Logger;
 
 import java.nio.ByteBuffer;
+import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.Objects;
 import java.util.Optional;
@@ -75,6 +77,12 @@
 import static org.onosproject.net.AnnotationKeys.PORT_NAME;
 import static org.onosproject.openstacknetworking.api.Constants.DIRECT;
 import static org.onosproject.openstacknetworking.api.Constants.PCISLOT;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.FLAT;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.GENEVE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.GRE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.LOCAL;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VLAN;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VXLAN;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.getIntfNameFromPciAddress;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.vnicType;
 import static org.onosproject.openstacknode.api.OpenstackNode.NodeType.GATEWAY;
@@ -96,12 +104,16 @@
     protected final Logger log = getLogger(getClass());
 
     private static final String MSG_NETWORK  = "OpenStack network %s %s";
+    private static final String MSG_NETWORK_TYPE  = "OpenStack network type %s %s";
     private static final String MSG_SUBNET  = "OpenStack subnet %s %s";
     private static final String MSG_PORT = "OpenStack port %s %s";
     private static final String MSG_CREATED = "created";
     private static final String MSG_UPDATED = "updated";
     private static final String MSG_REMOVED = "removed";
 
+    private static final String ERR_NOT_FOUND = " does not exist";
+    private static final String ERR_DUPLICATE = " already exists";
+
     private static final String ERR_NULL_NETWORK  =
                                 "OpenStack network cannot be null";
     private static final String ERR_NULL_NETWORK_ID  =
@@ -148,6 +160,7 @@
                                 delegate = new InternalNetworkStoreDelegate();
 
     private ConsistentMap<String, ExternalPeerRouter> externalPeerRouterMap;
+    private ConsistentMap<String, OpenstackNetwork> augmentedNetworkMap;
 
     private static final KryoNamespace
             SERIALIZER_EXTERNAL_PEER_ROUTER_MAP = KryoNamespace.newBuilder()
@@ -159,6 +172,14 @@
             .register(VlanId.class)
             .build();
 
+    private static final KryoNamespace
+            SERIALIZER_AUGMENTED_NETWORK_MAP = KryoNamespace.newBuilder()
+            .register(KryoNamespaces.API)
+            .register(OpenstackNetwork.Type.class)
+            .register(OpenstackNetwork.class)
+            .register(DefaultOpenstackNetwork.class)
+            .build();
+
     private ApplicationId appId;
 
 
@@ -174,6 +195,12 @@
                 .withName("external-routermap")
                 .withApplicationId(appId)
                 .build();
+
+        augmentedNetworkMap = storageService.<String, OpenstackNetwork>consistentMapBuilder()
+                .withSerializer(Serializer.using(SERIALIZER_AUGMENTED_NETWORK_MAP))
+                .withName("augmented-networkmap")
+                .withApplicationId(appId)
+                .build();
     }
 
     @Deactivate
@@ -188,6 +215,14 @@
         checkArgument(!Strings.isNullOrEmpty(osNet.getId()), ERR_NULL_NETWORK_ID);
 
         osNetworkStore.createNetwork(osNet);
+
+        OpenstackNetwork finalAugmentedNetwork = buildAugmentedNetworkFromType(osNet);
+        augmentedNetworkMap.compute(osNet.getId(), (id, existing) -> {
+            final String error = osNet.getId() + ERR_DUPLICATE;
+            checkArgument(existing == null, error);
+            return finalAugmentedNetwork;
+        });
+
         log.info(String.format(MSG_NETWORK, osNet.getName(), MSG_CREATED));
     }
 
@@ -197,6 +232,14 @@
         checkArgument(!Strings.isNullOrEmpty(osNet.getId()), ERR_NULL_NETWORK_ID);
 
         osNetworkStore.updateNetwork(osNet);
+
+        OpenstackNetwork finalAugmentedNetwork = buildAugmentedNetworkFromType(osNet);
+        augmentedNetworkMap.compute(osNet.getId(), (id, existing) -> {
+            final String error = osNet.getId() + ERR_NOT_FOUND;
+            checkArgument(existing != null, error);
+            return finalAugmentedNetwork;
+        });
+
         log.info(String.format(MSG_NETWORK, osNet.getId(), MSG_UPDATED));
     }
 
@@ -212,6 +255,12 @@
             if (osNet != null) {
                 log.info(String.format(MSG_NETWORK, osNet.getName(), MSG_REMOVED));
             }
+
+            Versioned<OpenstackNetwork> augmentedNetwork = augmentedNetworkMap.remove(netId);
+            if (augmentedNetwork != null) {
+                log.info(String.format(MSG_NETWORK_TYPE,
+                                    augmentedNetwork.value().type(), MSG_REMOVED));
+            }
         }
     }
 
@@ -382,29 +431,28 @@
             return Sets.newHashSet();
         }
 
-        Set<Network> networks = osNetworkStore.networks();
         Set<String> networkIds = Sets.newConcurrentHashSet();
 
         switch (type.toUpperCase()) {
             case "FLAT" :
-                networkIds = networks.stream()
-                        .filter(n -> n.getNetworkType() == NetworkType.FLAT)
-                        .map(IdEntity::getId).collect(Collectors.toSet());
+                networkIds = augmentedNetworkMap.asJavaMap().entrySet().stream()
+                        .filter(e -> e.getValue().type() == FLAT)
+                        .map(Map.Entry::getKey).collect(Collectors.toSet());
                 break;
             case "VXLAN" :
-                networkIds = networks.stream()
-                        .filter(n -> n.getNetworkType() == NetworkType.VXLAN)
-                        .map(IdEntity::getId).collect(Collectors.toSet());
+                networkIds = augmentedNetworkMap.asJavaMap().entrySet().stream()
+                        .filter(e -> e.getValue().type() == Type.VXLAN)
+                        .map(Map.Entry::getKey).collect(Collectors.toSet());
                 break;
             case "GRE" :
-                networkIds = networks.stream()
-                        .filter(n -> n.getNetworkType() == NetworkType.GRE)
-                        .map(IdEntity::getId).collect(Collectors.toSet());
+                networkIds = augmentedNetworkMap.asJavaMap().entrySet().stream()
+                        .filter(e -> e.getValue().type() == Type.GRE)
+                        .map(Map.Entry::getKey).collect(Collectors.toSet());
                 break;
             case "VLAN" :
-                networkIds = networks.stream()
-                        .filter(n -> n.getNetworkType() == NetworkType.VLAN)
-                        .map(IdEntity::getId).collect(Collectors.toSet());
+                networkIds = augmentedNetworkMap.asJavaMap().entrySet().stream()
+                        .filter(e -> e.getValue().type() == VLAN)
+                        .map(Map.Entry::getKey).collect(Collectors.toSet());
                 break;
             default:
                 break;
@@ -633,12 +681,12 @@
     }
 
     @Override
-    public String networkType(String netId) {
-        Network network = network(netId);
+    public Type networkType(String netId) {
+        OpenstackNetwork network = augmentedNetworkMap.asJavaMap().get(netId);
 
         checkNotNull(network);
 
-        return network.getNetworkType().toString();
+        return network.type();
     }
 
     @Override
@@ -674,6 +722,35 @@
         return network.getProviderSegID();
     }
 
+    private OpenstackNetwork buildAugmentedNetworkFromType(Network osNet) {
+        OpenstackNetwork augmentedNetwork = null;
+        if (osNet.getNetworkType() == null) {
+            augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), GENEVE);
+        } else {
+            switch (osNet.getNetworkType()) {
+                case FLAT:
+                    augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), FLAT);
+                    break;
+                case VLAN:
+                    augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), VLAN);
+                    break;
+                case VXLAN:
+                    augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), VXLAN);
+                    break;
+                case GRE:
+                    augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), GRE);
+                    break;
+                case LOCAL:
+                    augmentedNetwork = new DefaultOpenstackNetwork(osNet.getId(), LOCAL);
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        return augmentedNetwork;
+    }
+
     private boolean isNetworkInUse(String netId) {
         return !subnets(netId).isEmpty() && !ports(netId).isEmpty();
     }
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingFloatingIpHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingFloatingIpHandler.java
index 10abe3b..5a324ee 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingFloatingIpHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingFloatingIpHandler.java
@@ -42,6 +42,7 @@
 import org.onosproject.openstacknetworking.api.InstancePortEvent;
 import org.onosproject.openstacknetworking.api.InstancePortListener;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkEvent;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkListener;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
@@ -55,7 +56,6 @@
 import org.onosproject.openstacknode.api.OpenstackNodeService;
 import org.openstack4j.model.network.NetFloatingIP;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Port;
 import org.openstack4j.openstack.networking.domain.NeutronFloatingIP;
 import org.osgi.service.component.annotations.Activate;
@@ -80,6 +80,9 @@
 import static org.onosproject.openstacknetworking.api.InstancePort.State.REMOVE_PENDING;
 import static org.onosproject.openstacknetworking.api.InstancePortEvent.Type.OPENSTACK_INSTANCE_MIGRATION_ENDED;
 import static org.onosproject.openstacknetworking.api.InstancePortEvent.Type.OPENSTACK_INSTANCE_MIGRATION_STARTED;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.GRE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VLAN;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VXLAN;
 import static org.onosproject.openstacknetworking.api.OpenstackNetworkEvent.Type.OPENSTACK_PORT_PRE_REMOVE;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.associatedFloatingIp;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.externalPeerRouterForNetwork;
@@ -387,22 +390,23 @@
                                                   ExternalPeerRouter externalPeerRouter,
                                                   Set<OpenstackNode> gateways, boolean install) {
         OpenstackNode cNode = osNodeService.node(instPort.deviceId());
+        Type netType = osNetworkService.networkType(osNet.getId());
         if (cNode == null) {
             final String error = String.format("Cannot find openstack node for device %s",
                     instPort.deviceId());
             throw new IllegalStateException(error);
         }
-        if (osNet.getNetworkType() == NetworkType.VXLAN && cNode.dataIp() == null) {
+        if (netType == VXLAN && cNode.dataIp() == null) {
             final String errorFormat = ERR_FLOW + "VXLAN mode is not ready for %s";
             final String error = String.format(errorFormat, floatingIp, cNode.hostname());
             throw new IllegalStateException(error);
         }
-        if (osNet.getNetworkType() == NetworkType.GRE && cNode.dataIp() == null) {
+        if (netType == GRE && cNode.dataIp() == null) {
             final String errorFormat = ERR_FLOW + "GRE mode is not ready for %s";
             final String error = String.format(errorFormat, floatingIp, cNode.hostname());
             throw new IllegalStateException(error);
         }
-        if (osNet.getNetworkType() == NetworkType.VLAN && cNode.vlanIntf() == null) {
+        if (netType == VLAN && cNode.vlanIntf() == null) {
             final String errorFormat = ERR_FLOW + "VLAN mode is not ready for %s";
             final String error = String.format(errorFormat, floatingIp, cNode.hostname());
             throw new IllegalStateException(error);
@@ -490,6 +494,7 @@
         }
 
         TrafficSelector selector = sBuilder.build();
+        Type netType = osNetworkService.networkType(osNet.getId());
 
         osNodeService.completeNodes(GATEWAY).forEach(gNode -> {
             TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder()
@@ -497,7 +502,7 @@
                     .setEthSrc(instPort.macAddress())
                     .setEthDst(externalPeerRouter.macAddress());
 
-            if (osNet.getNetworkType().equals(NetworkType.VLAN)) {
+            if (netType == VLAN) {
                 tBuilder.popVlan();
             }
 
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingHandler.java
index bde5efe..bc02119 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingHandler.java
@@ -48,6 +48,7 @@
 import org.onosproject.openstacknetworking.api.InstancePortListener;
 import org.onosproject.openstacknetworking.api.InstancePortService;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkAdminService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterEvent;
 import org.onosproject.openstacknetworking.api.OpenstackRouterListener;
@@ -59,7 +60,6 @@
 import org.onosproject.openstacknode.api.OpenstackNodeService;
 import org.openstack4j.model.network.ExternalGateway;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Router;
 import org.openstack4j.model.network.RouterInterface;
 import org.openstack4j.model.network.Subnet;
@@ -95,13 +95,14 @@
 import static org.onosproject.openstacknetworking.api.Constants.ROUTING_TABLE;
 import static org.onosproject.openstacknetworking.api.Constants.STAT_OUTBOUND_TABLE;
 import static org.onosproject.openstacknetworking.api.InstancePort.State.ACTIVE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.FLAT;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VLAN;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.USE_STATEFUL_SNAT;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.USE_STATEFUL_SNAT_DEFAULT;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.tunnelPortNumByNetType;
 import static org.onosproject.openstacknetworking.util.RulePopulatorUtil.buildExtension;
 import static org.onosproject.openstacknode.api.OpenstackNode.NodeType.COMPUTE;
 import static org.onosproject.openstacknode.api.OpenstackNode.NodeType.GATEWAY;
-import static org.openstack4j.model.network.NetworkType.FLAT;
 
 /**
  * Handles OpenStack router events.
@@ -219,8 +220,11 @@
             Network network = osNetworkAdminService.network(
                     osNetworkAdminService.subnet(iface.getSubnetId())
                     .getNetworkId());
+            Type netType = osNetworkAdminService.networkType(
+                    osNetworkAdminService.subnet(iface.getSubnetId())
+                    .getNetworkId());
             setRouterAdminRules(network.getProviderSegID(),
-                    network.getNetworkType(), !osRouter.isAdminStateUp());
+                                netType, !osRouter.isAdminStateUp());
         });
 
         ExternalPeerRouter externalPeerRouter =
@@ -269,7 +273,10 @@
             Network network = osNetworkAdminService.network(
                     osNetworkAdminService.subnet(iface.getSubnetId())
                     .getNetworkId());
-            setRouterAdminRules(network.getProviderSegID(), network.getNetworkType(), false);
+            Type netType = osNetworkAdminService.networkType(
+                    osNetworkAdminService.subnet(iface.getSubnetId())
+                            .getNetworkId());
+            setRouterAdminRules(network.getProviderSegID(), netType, false);
         });
     }
 
@@ -285,8 +292,8 @@
 
         if (!osRouter.isAdminStateUp()) {
             Network network = osNetworkAdminService.network(osSubnet.getNetworkId());
-            setRouterAdminRules(network.getProviderSegID(),
-                                network.getNetworkType(), true);
+            Type netType = osNetworkAdminService.networkType(osSubnet.getNetworkId());
+            setRouterAdminRules(network.getProviderSegID(), netType, true);
         }
 
         setInternalRoutes(osRouter, osSubnet, true);
@@ -310,8 +317,8 @@
 
         if (!osRouter.isAdminStateUp()) {
             Network network = osNetworkAdminService.network(osSubnet.getNetworkId());
-            setRouterAdminRules(network.getProviderSegID(),
-                                network.getNetworkType(), false);
+            Type netType = osNetworkAdminService.networkType(osSubnet.getNetworkId());
+            setRouterAdminRules(network.getProviderSegID(), netType, false);
         }
 
         setInternalRoutes(osRouter, osSubnet, false);
@@ -326,11 +333,11 @@
     private void setSourceNat(RouterInterface routerIface, boolean install) {
         Subnet osSubnet = osNetworkAdminService.subnet(routerIface.getSubnetId());
         Network osNet = osNetworkAdminService.network(osSubnet.getNetworkId());
+        Type netType = osNetworkAdminService.networkType(osSubnet.getNetworkId());
 
         osNodeService.completeNodes(COMPUTE).forEach(cNode -> {
             setRulesToGateway(cNode, osNet.getProviderSegID(),
-                    IpPrefix.valueOf(osSubnet.getCidr()), osNet.getNetworkType(),
-                    install);
+                    IpPrefix.valueOf(osSubnet.getCidr()), netType, install);
         });
 
         if (useStatefulSnat) {
@@ -346,8 +353,9 @@
     private void setStatefulSnatRules(RouterInterface routerIface, boolean install) {
         Subnet osSubnet = osNetworkAdminService.subnet(routerIface.getSubnetId());
         Network osNet = osNetworkAdminService.network(osSubnet.getNetworkId());
+        Type netType = osNetworkAdminService.networkType(osSubnet.getNetworkId());
 
-        if (osNet.getNetworkType() == FLAT) {
+        if (netType == FLAT) {
             return;
         }
 
@@ -374,7 +382,7 @@
                                     Long.parseLong(osNet.getProviderSegID()),
                                     IpPrefix.valueOf(port.ipAddress(), VM_PREFIX),
                                     port.deviceId(),
-                                    osNet.getNetworkType(),
+                                    netType,
                                     install));
 
                         setOvsNatIngressRule(gwNode.intgBridge(),
@@ -389,13 +397,14 @@
     private void setReactiveSnatRules(RouterInterface routerIface, boolean install) {
         Subnet osSubnet = osNetworkAdminService.subnet(routerIface.getSubnetId());
         Network osNet = osNetworkAdminService.network(osSubnet.getNetworkId());
+        Type netType = osNetworkAdminService.networkType(osSubnet.getNetworkId());
 
         osNodeService.completeNodes(GATEWAY)
                 .forEach(gwNode -> setRulesToController(
                         gwNode.intgBridge(),
                         osNet.getProviderSegID(),
                         IpPrefix.valueOf(osSubnet.getCidr()),
-                        osNet.getNetworkType(),
+                        netType,
                         install));
     }
 
@@ -493,7 +502,7 @@
                         network.getProviderSegID(),
                         osSubnet,
                         routableSubnets,
-                        NetworkType.VXLAN,
+                        Type.VXLAN,
                         install));
     }
 
@@ -510,7 +519,7 @@
                         network.getProviderSegID(),
                         osSubnet,
                         routableSubnets,
-                        NetworkType.GRE,
+                        Type.GRE,
                         install));
     }
 
@@ -527,12 +536,12 @@
                         network.getProviderSegID(),
                         osSubnet,
                         routableSubnets,
-                        NetworkType.VLAN,
+                        VLAN,
                         install));
     }
 
     private void setInternalRoutes(Router osRouter, Subnet updatedSubnet, boolean install) {
-        Network updatedNetwork = osNetworkAdminService.network(updatedSubnet.getNetworkId());
+        Type netType = osNetworkAdminService.networkType(updatedSubnet.getNetworkId());
         Set<Subnet> routableSubnets = routableSubnets(osRouter, updatedSubnet.getId());
         String updatedSegmentId = getSegmentId(updatedSubnet);
 
@@ -545,7 +554,7 @@
                     updatedSegmentId,
                     IpPrefix.valueOf(updatedSubnet.getCidr()),
                     IpPrefix.valueOf(updatedSubnet.getCidr()),
-                    updatedNetwork.getNetworkType(),
+                    netType,
                     install
             );
 
@@ -556,7 +565,7 @@
                         getSegmentId(subnet),
                         IpPrefix.valueOf(updatedSubnet.getCidr()),
                         IpPrefix.valueOf(subnet.getCidr()),
-                        updatedNetwork.getNetworkType(),
+                        netType,
                         install
                 );
                 setInternalRouterRules(
@@ -565,7 +574,7 @@
                         updatedSegmentId,
                         IpPrefix.valueOf(subnet.getCidr()),
                         IpPrefix.valueOf(updatedSubnet.getCidr()),
-                        updatedNetwork.getNetworkType(),
+                        netType,
                         install
                 );
             });
@@ -615,7 +624,7 @@
 
     private void setInternalRouterRules(DeviceId deviceId, String srcSegId, String dstSegId,
                                         IpPrefix srcSubnet, IpPrefix dstSubnet,
-                                        NetworkType networkType, boolean install) {
+                                        Type networkType, boolean install) {
 
         switch (networkType) {
             case VXLAN:
@@ -740,7 +749,7 @@
     private void setRulesToGateway(OpenstackNode osNode,
                                    String segmentId,
                                    IpPrefix srcSubnet,
-                                   NetworkType networkType,
+                                   Type networkType,
                                    boolean install) {
         OpenstackNode sourceNatGateway =
                 osNodeService.completeNodes(GATEWAY).stream().findFirst().orElse(null);
@@ -774,7 +783,7 @@
         switch (networkType) {
             case VXLAN:
             case GRE:
-                PortNumber portNum = tunnelPortNumByNetType(networkType.name(), osNode);
+                PortNumber portNum = tunnelPortNumByNetType(networkType, osNode);
                 tBuilder.extension(buildExtension(
                                 deviceService,
                                 osNode.intgBridge(),
@@ -805,7 +814,7 @@
                                             Long vni,
                                             IpPrefix destVmIp,
                                             DeviceId dstDeviceId,
-                                            NetworkType networkType,
+                                            Type networkType,
                                             boolean install) {
 
         TrafficSelector selector = DefaultTrafficSelector.builder()
@@ -813,7 +822,7 @@
                 .matchIPDst(destVmIp)
                 .build();
 
-        PortNumber portNum = tunnelPortNumByNetType(networkType.name(),
+        PortNumber portNum = tunnelPortNumByNetType(networkType,
                                                     osNodeService.node(deviceId));
 
         TrafficTreatment treatment = DefaultTrafficTreatment.builder()
@@ -841,7 +850,7 @@
                                                       String segmentId,
                                                       Subnet updatedSubnet,
                                                       Set<Subnet> routableSubnets,
-                                                      NetworkType networkType,
+                                                      Type networkType,
                                                       boolean install) {
         //At first we install flow rules to gateway with segId and gatewayIp of updated subnet
         setRulesToGatewayWithDstIp(osNode, sourceNatGateway, segmentId,
@@ -863,7 +872,7 @@
                                             OpenstackNode sourceNatGateway,
                                             String segmentId,
                                             IpAddress dstIp,
-                                            NetworkType networkType,
+                                            Type networkType,
                                             boolean install) {
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder()
                 .matchEthType(Ethernet.TYPE_IPV4)
@@ -876,7 +885,7 @@
             case GRE:
                 sBuilder.matchTunnelId(Long.parseLong(segmentId));
 
-                PortNumber portNum = tunnelPortNumByNetType(networkType.name(), osNode);
+                PortNumber portNum = tunnelPortNumByNetType(networkType, osNode);
 
                 tBuilder.extension(buildExtension(
                         deviceService,
@@ -975,7 +984,7 @@
     private void setRulesToController(DeviceId deviceId,
                                       String segmentId,
                                       IpPrefix srcSubnet,
-                                      NetworkType networkType,
+                                      Type networkType,
                                       boolean install) {
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder()
                 .matchEthType(Ethernet.TYPE_IPV4)
@@ -999,7 +1008,7 @@
 
         TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
 
-        if (networkType.equals(NetworkType.VLAN)) {
+        if (networkType == VLAN) {
             tBuilder.popVlan();
         }
 
@@ -1016,7 +1025,7 @@
     }
 
     private void setRouterAdminRules(String segmentId,
-                                     NetworkType networkType,
+                                     Type networkType,
                                      boolean install) {
         TrafficTreatment treatment;
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder()
@@ -1288,7 +1297,9 @@
 
         private void instPortDetected(InstancePort instPort) {
             Network network = osNetworkAdminService.network(instPort.networkId());
-            if (network.getNetworkType() == FLAT) {
+            Type netType = osNetworkAdminService.networkType(instPort.networkId());
+
+            if (netType == FLAT) {
                 return;
             }
 
@@ -1298,13 +1309,15 @@
                                 gwNode.intgBridge(),
                                 Long.parseLong(network.getProviderSegID()),
                                 IpPrefix.valueOf(instPort.ipAddress(), VM_PREFIX),
-                                instPort.deviceId(), network.getNetworkType(), true));
+                                instPort.deviceId(), netType, true));
             }
         }
 
         private void instPortRemoved(InstancePort instPort) {
             Network network = osNetworkAdminService.network(instPort.networkId());
-            if (network.getNetworkType() == FLAT) {
+            Type netType = osNetworkAdminService.networkType(instPort.networkId());
+
+            if (netType == FLAT) {
                 return;
             }
 
@@ -1314,7 +1327,7 @@
                                 gwNode.intgBridge(),
                                 Long.parseLong(network.getProviderSegID()),
                                 IpPrefix.valueOf(instPort.ipAddress(), VM_PREFIX),
-                                instPort.deviceId(), network.getNetworkType(), false));
+                                instPort.deviceId(), netType, false));
             }
         }
     }
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingIcmpHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingIcmpHandler.java
index 41c973e..977fe36 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingIcmpHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingIcmpHandler.java
@@ -102,10 +102,6 @@
     private static final String ERR_REQ = "Failed to handle ICMP request: ";
     private static final String ERR_DUPLICATE = " already exists";
 
-    private static final String VXLAN = "VXLAN";
-    private static final String GRE = "GRE";
-    private static final String VLAN = "VLAN";
-
     @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
index 1f0f874..d1072cb 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
@@ -42,6 +42,7 @@
 import org.onosproject.openstacknetworking.api.InstancePort;
 import org.onosproject.openstacknetworking.api.InstancePortService;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterService;
 import org.onosproject.openstacknetworking.util.RulePopulatorUtil;
@@ -54,7 +55,6 @@
 import org.onosproject.store.service.StorageService;
 import org.openstack4j.model.network.IP;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Port;
 import org.openstack4j.model.network.Subnet;
 import org.osgi.service.component.annotations.Activate;
@@ -229,6 +229,8 @@
                                        TpPort patPort, IpAddress externalIp,
                                        ExternalPeerRouter externalPeerRouter) {
         Network osNet = osNetworkService.network(srcInstPort.networkId());
+        Type netType = osNetworkService.networkType(srcInstPort.networkId());
+
         if (osNet == null) {
             final String error = String.format("%s network %s not found",
                                         ERR_PACKETIN, srcInstPort.networkId());
@@ -237,14 +239,14 @@
 
         setDownstreamRules(srcInstPort,
                 osNet.getProviderSegID(),
-                osNet.getNetworkType(),
+                netType,
                 externalIp,
                 externalPeerRouter,
                 patPort,
                 packetIn);
 
         setUpstreamRules(osNet.getProviderSegID(),
-                osNet.getNetworkType(),
+                netType,
                 externalIp,
                 externalPeerRouter,
                 patPort,
@@ -252,7 +254,7 @@
     }
 
     private void setDownstreamRules(InstancePort srcInstPort, String segmentId,
-                                    NetworkType networkType,
+                                    Type networkType,
                                     IpAddress externalIp,
                                     ExternalPeerRouter externalPeerRouter,
                                     TpPort patPort,
@@ -323,7 +325,7 @@
         });
     }
 
-    private TrafficTreatment getDownStreamTreatment(NetworkType networkType,
+    private TrafficTreatment getDownStreamTreatment(Type networkType,
                                                     TrafficTreatment.Builder tBuilder,
                                                     OpenstackNode gNode,
                                                     OpenstackNode srcNode) {
@@ -332,7 +334,7 @@
         switch (networkType) {
             case VXLAN:
             case GRE:
-                PortNumber portNum = tunnelPortNumByNetType(networkType.name(), gNode);
+                PortNumber portNum = tunnelPortNumByNetType(networkType, gNode);
                 tmpBuilder.extension(RulePopulatorUtil.buildExtension(
                         deviceService,
                         gNode.intgBridge(),
@@ -352,7 +354,7 @@
     }
 
     private void setUpstreamRules(String segmentId,
-                                  NetworkType networkType,
+                                  Type networkType,
                                   IpAddress externalIp,
                                   ExternalPeerRouter externalPeerRouter,
                                   TpPort patPort,
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSecurityGroupHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSecurityGroupHandler.java
index d162920..15920fe 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSecurityGroupHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSecurityGroupHandler.java
@@ -48,6 +48,7 @@
 import org.onosproject.openstacknetworking.api.InstancePortEvent;
 import org.onosproject.openstacknetworking.api.InstancePortListener;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkEvent;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkListener;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
@@ -63,7 +64,6 @@
 import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.StorageService;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Port;
 import org.openstack4j.model.network.SecurityGroup;
 import org.openstack4j.model.network.SecurityGroupRule;
@@ -107,6 +107,9 @@
 import static org.onosproject.openstacknetworking.api.Constants.PRIORITY_CT_DROP_RULE;
 import static org.onosproject.openstacknetworking.api.Constants.PRIORITY_CT_HOOK_RULE;
 import static org.onosproject.openstacknetworking.api.Constants.PRIORITY_CT_RULE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.GRE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VLAN;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VXLAN;
 import static org.onosproject.openstacknetworking.api.OpenstackNetworkEvent.Type.OPENSTACK_PORT_PRE_REMOVE;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.USE_SECURITY_GROUP;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.USE_SECURITY_GROUP_DEFAULT;
@@ -217,10 +220,6 @@
     private static final String INGRESS = "INGRESS";
     private static final IpPrefix IP_PREFIX_ANY = Ip4Prefix.valueOf("0.0.0.0/0");
 
-    private static final String VXLAN = "VXLAN";
-    private static final String GRE = "GRE";
-    private static final String VLAN = "VLAN";
-
     // We expose pipeline structure to SONA application considering removing pipeline soon.
     private static final int GOTO_CONNTRACK_TABLE = CT_TABLE;
     private static final int GOTO_JUMP_TABLE = JUMP_TABLE;
@@ -582,11 +581,11 @@
 
     private void buildTunnelId(TrafficSelector.Builder sBuilder, String netId) {
         String segId = osNetService.segmentId(netId);
-        String netType = osNetService.networkType(netId);
+        Type netType = osNetService.networkType(netId);
 
-        if (VLAN.equals(netType)) {
+        if (netType == VLAN) {
             sBuilder.matchVlanId(VlanId.vlanId(segId));
-        } else if (VXLAN.equals(netType) || GRE.equals(netType)) {
+        } else if (netType == VXLAN || netType == GRE) {
             sBuilder.matchTunnelId(Long.valueOf(segId));
         } else {
             log.warn("Cannot tag the VID due to lack of support of virtual network type {}", netType);
@@ -907,7 +906,7 @@
             TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
 
             Network net = osNetService.network(instPort.networkId());
-            NetworkType netType = net.getNetworkType();
+            Type netType = osNetService.networkType(instPort.networkId());
             String segId = net.getProviderSegID();
 
             switch (netType) {
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingArpHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingArpHandler.java
index 3670390..3ac0c0d 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingArpHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingArpHandler.java
@@ -46,6 +46,7 @@
 import org.onosproject.openstacknetworking.api.InstancePortListener;
 import org.onosproject.openstacknetworking.api.InstancePortService;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkEvent;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkListener;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
@@ -54,7 +55,6 @@
 import org.onosproject.openstacknode.api.OpenstackNodeListener;
 import org.onosproject.openstacknode.api.OpenstackNodeService;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Subnet;
 import org.osgi.service.component.ComponentContext;
 import org.osgi.service.component.annotations.Activate;
@@ -85,6 +85,10 @@
 import static org.onosproject.openstacknetworking.api.Constants.PRIORITY_ARP_REPLY_RULE;
 import static org.onosproject.openstacknetworking.api.Constants.PRIORITY_ARP_REQUEST_RULE;
 import static org.onosproject.openstacknetworking.api.InstancePort.State.ACTIVE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.FLAT;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.GRE;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VLAN;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.VXLAN;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.ARP_MODE;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.ARP_MODE_DEFAULT;
 import static org.onosproject.openstacknetworking.impl.OsgiPropertyConstants.GATEWAY_MAC;
@@ -299,6 +303,8 @@
 
         if (ARP_BROADCAST_MODE.equals(getArpMode())) {
 
+            Type netType = osNetworkService.networkType(network.getId());
+
             String gateway = osSubnet.getGateway();
             if (gateway == null) {
                 return;
@@ -307,11 +313,10 @@
             TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
             TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
 
-            if (NetworkType.VLAN == network.getNetworkType()) {
+            if (netType == VLAN) {
                 sBuilder.matchVlanId(VlanId.vlanId(network.getProviderSegID()));
                 tBuilder.popVlan();
-            } else if (NetworkType.VXLAN == network.getNetworkType() ||
-                       NetworkType.GRE == network.getNetworkType()) {
+            } else if (netType == VXLAN || netType == GRE) {
                 // do not remove fake gateway ARP rules, if there is another gateway
                 // which has the same subnet that to be removed
                 // this only occurs if we have duplicated subnets associated with
@@ -371,9 +376,9 @@
      * @param install   installation flag
      */
     private void setArpRequestRule(InstancePort port, boolean install) {
-        NetworkType type = osNetworkService.network(port.networkId()).getNetworkType();
+        Type netType = osNetworkService.networkType(port.networkId());
 
-        switch (type) {
+        switch (netType) {
             case VXLAN:
             case GRE:
                 setRemoteArpRequestRuleForTunnel(port, install);
@@ -393,9 +398,9 @@
      * @param install   installation flag
      */
     private void setArpReplyRule(InstancePort port, boolean install) {
-        NetworkType type = osNetworkService.network(port.networkId()).getNetworkType();
+        Type netType = osNetworkService.networkType(port.networkId());
 
-        switch (type) {
+        switch (netType) {
             case VXLAN:
                 setArpReplyRuleForVxlan(port, install);
                 break;
@@ -510,26 +515,26 @@
 
     // a helper method
     private TrafficSelector getArpReplySelectorForVxlan(InstancePort port) {
-        return getArpReplySelectorForVnet(port, NetworkType.VXLAN);
+        return getArpReplySelectorForVnet(port, VXLAN);
     }
 
     // a helper method
     private TrafficSelector getArpReplySelectorForGre(InstancePort port) {
-        return getArpReplySelectorForVnet(port, NetworkType.GRE);
+        return getArpReplySelectorForVnet(port, GRE);
     }
 
     // a helper method
     private TrafficSelector getArpReplySelectorForVlan(InstancePort port) {
-        return getArpReplySelectorForVnet(port, NetworkType.VLAN);
+        return getArpReplySelectorForVnet(port, VLAN);
     }
 
     // a helper method
     private TrafficSelector getArpReplySelectorForVnet(InstancePort port,
-                                                       NetworkType type) {
+                                                       Type type) {
 
         TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
 
-        if (type == NetworkType.VLAN) {
+        if (type == VLAN) {
             String segId = osNetworkService.network(port.networkId()).getProviderSegID();
             sBuilder.matchVlanId(VlanId.vlanId(segId));
         }
@@ -546,31 +551,31 @@
     private void setLocalArpReplyTreatmentForVxlan(TrafficSelector selector,
                                                    InstancePort port,
                                                    boolean install) {
-        setLocalArpReplyTreatmentForVnet(selector, port, NetworkType.VXLAN, install);
+        setLocalArpReplyTreatmentForVnet(selector, port, VXLAN, install);
     }
 
     // a helper method
     private void setLocalArpReplyTreatmentForGre(TrafficSelector selector,
                                                  InstancePort port,
                                                  boolean install) {
-        setLocalArpReplyTreatmentForVnet(selector, port, NetworkType.GRE, install);
+        setLocalArpReplyTreatmentForVnet(selector, port, GRE, install);
     }
 
     // a helper method
     private void setLocalArpReplyTreatmentForVlan(TrafficSelector selector,
                                                   InstancePort port,
                                                   boolean install) {
-        setLocalArpReplyTreatmentForVnet(selector, port, NetworkType.VLAN, install);
+        setLocalArpReplyTreatmentForVnet(selector, port, VLAN, install);
     }
 
     // a helper method
     private void setLocalArpReplyTreatmentForVnet(TrafficSelector selector,
                                                   InstancePort port,
-                                                  NetworkType type,
+                                                  Type type,
                                                   boolean install) {
         TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
 
-        if (type == NetworkType.VLAN) {
+        if (type == VLAN) {
             tBuilder.popVlan();
         }
 
@@ -739,7 +744,7 @@
                 log.warn("Network is not specified.");
                 return false;
             } else {
-                return network.getNetworkType() != NetworkType.FLAT;
+                return network.getProviderSegID() != null;
             }
         }
 
@@ -865,8 +870,7 @@
             // delegated to switch to handle
             osNetworkService.subnets().stream().filter(subnet ->
                     osNetworkService.network(subnet.getNetworkId()) != null &&
-                            osNetworkService.network(subnet.getNetworkId())
-                                    .getNetworkType() != NetworkType.FLAT)
+                            osNetworkService.networkType(subnet.getNetworkId()) != FLAT)
                     .forEach(subnet -> {
                         String netId = subnet.getNetworkId();
                         Network net = osNetworkService.network(netId);
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHandler.java
index 7988375..e4b22b5 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHandler.java
@@ -39,13 +39,13 @@
 import org.onosproject.openstacknetworking.api.InstancePortListener;
 import org.onosproject.openstacknetworking.api.InstancePortService;
 import org.onosproject.openstacknetworking.api.OpenstackFlowRuleService;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkEvent;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkListener;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknode.api.OpenstackNode;
 import org.onosproject.openstacknode.api.OpenstackNodeService;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.openstack4j.model.network.Port;
 import org.osgi.service.component.annotations.Activate;
 import org.osgi.service.component.annotations.Component;
@@ -492,7 +492,7 @@
 
     private void setNetworkBlockRules(Network network, boolean install) {
 
-        NetworkType type = network.getNetworkType();
+        Type type = osNetworkService.networkType(network.getId());
 
         // TODO: we block a network traffic by referring to segment ID for now
         // we might need to find a better way to block the traffic of a network
@@ -740,8 +740,7 @@
          * @param install install flag, add the rule if true, remove it otherwise
          */
         private void setNetworkRules(InstancePort instPort, boolean install) {
-            Network network = osNetworkService.network(instPort.networkId());
-            NetworkType type = network.getNetworkType();
+            Type type = osNetworkService.networkType(instPort.networkId());
 
             switch (type) {
                 case VXLAN:
@@ -790,8 +789,7 @@
          * @param instPort instance port
          */
         private void removeVportRules(InstancePort instPort) {
-            Network network = osNetworkService.network(instPort.networkId());
-            NetworkType type = network.getNetworkType();
+            Type type = osNetworkService.networkType(instPort.networkId());
 
             switch (type) {
                 case VXLAN:
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
index 828e647..1b42ccf 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
@@ -41,13 +41,13 @@
 import org.onosproject.net.provider.AbstractProvider;
 import org.onosproject.net.provider.ProviderId;
 import org.onosproject.openstacknetworking.api.Constants;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknode.api.OpenstackNode;
 import org.onosproject.openstacknode.api.OpenstackNodeEvent;
 import org.onosproject.openstacknode.api.OpenstackNodeListener;
 import org.onosproject.openstacknode.api.OpenstackNodeService;
 import org.openstack4j.model.network.Network;
-import org.openstack4j.model.network.NetworkType;
 import org.osgi.service.component.annotations.Activate;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Deactivate;
@@ -72,6 +72,7 @@
 import static org.onosproject.openstacknetworking.api.Constants.PORT_NAME_PREFIX_VM;
 import static org.onosproject.openstacknetworking.api.Constants.PORT_NAME_VHOST_USER_PREFIX_VM;
 import static org.onosproject.openstacknetworking.api.Constants.portNamePrefixMap;
+import static org.onosproject.openstacknetworking.api.OpenstackNetwork.Type.FLAT;
 import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.vnicType;
 import static org.onosproject.openstacknode.api.OpenstackNode.NodeType.CONTROLLER;
 
@@ -230,7 +231,8 @@
                 .set(ANNOTATION_CREATE_TIME, String.valueOf(createTime));
 
         // FLAT typed network does not require segment ID
-        if (osNet.getNetworkType() != NetworkType.FLAT) {
+        Type netType = osNetworkService.networkType(osNet.getId());
+        if (netType != FLAT) {
             annotations.set(ANNOTATION_SEGMENT_ID, osNet.getProviderSegID());
         }
 
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
index 66d1f2a..c4e3803 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
@@ -59,6 +59,7 @@
 import org.onosproject.openstacknetworking.api.Constants.VnicType;
 import org.onosproject.openstacknetworking.api.ExternalPeerRouter;
 import org.onosproject.openstacknetworking.api.InstancePort;
+import org.onosproject.openstacknetworking.api.OpenstackNetwork.Type;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterAdminService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterService;
@@ -769,9 +770,9 @@
                     .append(COMMA);
 
             String modifiedDstIp = dstIp;
-            if (osNetService.networkType(srcInstancePort.networkId()).equals(VXLAN) ||
-                    osNetService.networkType(srcInstancePort.networkId()).equals(GRE) ||
-                    osNetService.networkType(srcInstancePort.networkId()).equals(VLAN)) {
+            if (osNetService.networkType(srcInstancePort.networkId()) == Type.VXLAN ||
+                    osNetService.networkType(srcInstancePort.networkId()) == Type.GRE ||
+                    osNetService.networkType(srcInstancePort.networkId()) == Type.VLAN) {
                 if (srcIp.equals(dstIp)) {
                     modifiedDstIp = osNetService.gatewayIp(srcInstancePort.portId());
                     requestStringBuilder.append(DL_DST)
@@ -797,9 +798,9 @@
                     .append(dstIp)
                     .append(COMMA);
 
-            if (osNetService.networkType(srcInstancePort.networkId()).equals(VXLAN) ||
-                    osNetService.networkType(srcInstancePort.networkId()).equals(GRE) ||
-                    osNetService.networkType(srcInstancePort.networkId()).equals(VLAN)) {
+            if (osNetService.networkType(srcInstancePort.networkId()) == Type.VXLAN ||
+                    osNetService.networkType(srcInstancePort.networkId()) == Type.GRE ||
+                    osNetService.networkType(srcInstancePort.networkId()) == Type.VLAN) {
                 requestStringBuilder.append(TUN_ID)
                         .append(osNetService.segmentId(srcInstancePort.networkId()))
                         .append(COMMA);
@@ -1060,7 +1061,7 @@
     public static PortNumber tunnelPortNumByNetId(String netId,
                                                   OpenstackNetworkService netService,
                                                   OpenstackNode osNode) {
-        String netType = netService.networkType(netId);
+        Type netType = netService.networkType(netId);
 
         if (netType == null) {
             return null;
@@ -1076,7 +1077,7 @@
      * @param osNode openstack node
      * @return tunnel port number
      */
-    public static PortNumber tunnelPortNumByNetType(String netType, OpenstackNode osNode) {
+    public static PortNumber tunnelPortNumByNetType(Type netType, OpenstackNode osNode) {
         switch (netType) {
             case VXLAN:
                 return osNode.vxlanTunnelPortNum();