NETVIRT-1630 migrate to md-sal APIs
[netvirt.git] / neutronvpn / impl / src / main / java / org / opendaylight / netvirt / neutronvpn / NeutronPortChangeListener.java
index 4cb7d9da875f1da7687cd07eede88838af5d7a4e..5f4f768338c53dcc3c6d6df101fc187db3938d2b 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2015, 2017 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
+ * Copyright © 2015, 2018 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
@@ -7,15 +7,15 @@
  */
 package org.opendaylight.netvirt.neutronvpn;
 
-import static org.opendaylight.netvirt.neutronvpn.NeutronvpnUtils.buildfloatingIpIdToPortMappingIdentifier;
+import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
 
-import com.google.common.base.Optional;
 import com.google.common.base.Strings;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.gson.Gson;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -23,30 +23,44 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.ExecutionException;
 import java.util.stream.Collectors;
-import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import javax.inject.Inject;
 import javax.inject.Singleton;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
-import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
-import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
-import org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase;
+import org.apache.commons.lang3.ObjectUtils;
+import org.eclipse.jdt.annotation.Nullable;
 import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
+import org.opendaylight.genius.datastoreutils.listeners.DataTreeEventCallbackRegistrar;
+import org.opendaylight.genius.infra.Datastore;
 import org.opendaylight.genius.infra.ManagedNewTransactionRunner;
 import org.opendaylight.genius.infra.ManagedNewTransactionRunnerImpl;
+import org.opendaylight.genius.infra.TypedWriteTransaction;
 import org.opendaylight.genius.mdsalutil.MDSALUtil;
 import org.opendaylight.infrautils.jobcoordinator.JobCoordinator;
+import org.opendaylight.infrautils.utils.concurrent.Executors;
+import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
+import org.opendaylight.mdsal.binding.api.DataBroker;
+import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
+import org.opendaylight.mdsal.common.api.ReadFailedException;
 import org.opendaylight.netvirt.elanmanager.api.IElanService;
 import org.opendaylight.netvirt.neutronvpn.api.enums.IpVersionChoice;
 import org.opendaylight.netvirt.neutronvpn.api.utils.NeutronConstants;
 import org.opendaylight.netvirt.neutronvpn.api.utils.NeutronUtils;
-import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev140508.L2vlan;
+import org.opendaylight.serviceutils.tools.listener.AbstractAsyncDataTreeChangeListener;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev170119.L2vlan;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.InterfaceBuilder;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.IfL2vlan;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.IfL2vlanBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.ParentRefs;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.ParentRefsBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.SplitHorizon;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.SplitHorizonBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.l2.types.rev130827.VlanId;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.aclservice.rev160608.InterfaceAcl;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.aclservice.rev160608.InterfaceAclBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.aclservice.rev160608.interfaces._interface.AllowedAddressPairs;
@@ -59,6 +73,8 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev16011
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ext.routers.RoutersBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.floating.ip.port.info.FloatingIpIdToPortMappingBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.floating.ip.port.info.FloatingIpIdToPortMappingKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.config.rev160806.NeutronvpnConfig;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.neutron.vpn.port.id.subport.data.PortIdToSubport;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.subnetmaps.Subnetmap;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.binding.rev150712.PortBindingExtension;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.hostconfig.rev150712.hostconfig.attributes.hostconfigs.Hostconfig;
@@ -73,7 +89,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 @Singleton
-public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<Port, NeutronPortChangeListener> {
+public class NeutronPortChangeListener extends AbstractAsyncDataTreeChangeListener<Port> {
     private static final Logger LOG = LoggerFactory.getLogger(NeutronPortChangeListener.class);
     private final DataBroker dataBroker;
     private final ManagedNewTransactionRunner txRunner;
@@ -84,7 +100,10 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
     private final JobCoordinator jobCoordinator;
     private final NeutronvpnUtils neutronvpnUtils;
     private final HostConfigCache hostConfigCache;
+    private final DataTreeEventCallbackRegistrar eventCallbacks;
+    private final NeutronvpnConfig neutronvpnConfig;
 
+    @Inject
     public NeutronPortChangeListener(final DataBroker dataBroker,
                                      final NeutronvpnManager neutronvpnManager,
                                      final NeutronvpnNatManager neutronvpnNatManager,
@@ -92,8 +111,12 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                                      final IElanService elanService,
                                      final JobCoordinator jobCoordinator,
                                      final NeutronvpnUtils neutronvpnUtils,
-                                     final HostConfigCache hostConfigCache) {
-        super(Port.class, NeutronPortChangeListener.class);
+                                     final HostConfigCache hostConfigCache,
+                                     final DataTreeEventCallbackRegistrar dataTreeEventCallbackRegistrar,
+                                     final NeutronvpnConfig neutronvpnConfig) {
+        super(dataBroker, LogicalDatastoreType.CONFIGURATION, InstanceIdentifier.create(Neutron.class)
+                .child(Ports.class).child(Port.class),
+                Executors.newSingleThreadExecutor("NeutronPortChangeListener", LOG));
         this.dataBroker = dataBroker;
         this.txRunner = new ManagedNewTransactionRunnerImpl(dataBroker);
         nvpnManager = neutronvpnManager;
@@ -103,28 +126,25 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         this.jobCoordinator = jobCoordinator;
         this.neutronvpnUtils = neutronvpnUtils;
         this.hostConfigCache = hostConfigCache;
+        this.eventCallbacks = dataTreeEventCallbackRegistrar;
+        this.neutronvpnConfig = neutronvpnConfig;
+
     }
 
-    @Override
-    @PostConstruct
     public void init() {
         LOG.info("{} init", getClass().getSimpleName());
-        registerListener(LogicalDatastoreType.CONFIGURATION, dataBroker);
     }
 
     @Override
-    protected InstanceIdentifier<Port> getWildCardPath() {
-        return InstanceIdentifier.create(Neutron.class).child(Ports.class).child(Port.class);
+    @PreDestroy
+    public void close() {
+        super.close();
+        Executors.shutdownAndAwaitTermination(getExecutorService());
     }
 
     @Override
-    protected NeutronPortChangeListener getDataTreeChangeListener() {
-        return NeutronPortChangeListener.this;
-    }
-
-
-    @Override
-    protected void add(InstanceIdentifier<Port> identifier, Port input) {
+    public void add(InstanceIdentifier<Port> identifier, Port input) {
+        LOG.trace("Received port add event: port={}", input);
         String portName = input.getUuid().getValue();
         LOG.trace("Adding Port : key: {}, value={}", identifier, input);
         Network network = neutronvpnUtils.getNeutronNetwork(input.getNetworkId());
@@ -134,16 +154,17 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                     portName, network);
             return;
         }
+
         neutronvpnUtils.addToPortCache(input);
         String portStatus = NeutronUtils.PORT_STATUS_DOWN;
         if (!Strings.isNullOrEmpty(input.getDeviceOwner()) && !Strings.isNullOrEmpty(input.getDeviceId())) {
-            if (input.getDeviceOwner().equals(NeutronConstants.DEVICE_OWNER_ROUTER_INF)) {
+            if (NeutronConstants.DEVICE_OWNER_ROUTER_INF.equals(input.getDeviceOwner())) {
                 handleRouterInterfaceAdded(input);
                 NeutronUtils.createPortStatus(input.getUuid().getValue(), NeutronUtils.PORT_STATUS_ACTIVE, dataBroker);
                 return;
             }
             if (NeutronConstants.DEVICE_OWNER_GATEWAY_INF.equals(input.getDeviceOwner())) {
-                handleRouterGatewayUpdated(input);
+                handleRouterGatewayUpdated(input, false);
                 portStatus = NeutronUtils.PORT_STATUS_ACTIVE;
             } else if (NeutronConstants.DEVICE_OWNER_FLOATING_IP.equals(input.getDeviceOwner())) {
                 handleFloatingIpPortUpdated(null, input);
@@ -161,10 +182,12 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
     }
 
     @Override
-    protected void remove(InstanceIdentifier<Port> identifier, Port input) {
+    public void remove(InstanceIdentifier<Port> identifier, Port input) {
         LOG.trace("Removing Port : key: {}, value={}", identifier, input);
         Network network = neutronvpnUtils.getNeutronNetwork(input.getNetworkId());
-        if (network == null || !NeutronvpnUtils.isNetworkTypeSupported(network)) {
+        // need to proceed with deletion in case network is null for a case where v2 sync happens and a read for
+        // network from NN returns null, but the deletion process for port needs to continue
+        if (network != null && !NeutronvpnUtils.isNetworkTypeSupported(network)) {
             String portName = input.getUuid().getValue();
             LOG.warn("neutron vpn received a port remove() for a network without a provider extension augmentation "
                             + "or with an unsupported network type for the port {} which is part of network {}",
@@ -175,12 +198,13 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         NeutronUtils.deletePortStatus(input.getUuid().getValue(), dataBroker);
 
         if (!Strings.isNullOrEmpty(input.getDeviceOwner()) && !Strings.isNullOrEmpty(input.getDeviceId())) {
-            if (input.getDeviceOwner().equals(NeutronConstants.DEVICE_OWNER_ROUTER_INF)) {
+            if (NeutronConstants.DEVICE_OWNER_ROUTER_INF.equals(input.getDeviceOwner())) {
                 handleRouterInterfaceRemoved(input);
                 /* nothing else to do here */
                 return;
             } else if (NeutronConstants.DEVICE_OWNER_GATEWAY_INF.equals(input.getDeviceOwner())
                     || NeutronConstants.DEVICE_OWNER_FLOATING_IP.equals(input.getDeviceOwner())) {
+                handleRouterGatewayUpdated(input, true);
                 elanService.removeKnownL3DmacAddress(input.getMacAddress().getValue(), input.getNetworkId().getValue());
             }
         }
@@ -190,7 +214,8 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
     }
 
     @Override
-    protected void update(InstanceIdentifier<Port> identifier, Port original, Port update) {
+    public void update(InstanceIdentifier<Port> identifier, Port original, Port update) {
+        LOG.trace("Received port update event: original={}, update={}", original, update);
         // Switchdev ports need to be bounded to a host before creation
         // in order to validate the supported vnic types from the hostconfig
         if (isPortTypeSwitchdev(original)
@@ -200,9 +225,8 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         }
         final String portName = update.getUuid().getValue();
         Network network = neutronvpnUtils.getNeutronNetwork(update.getNetworkId());
-        LOG.info("Update port {} from network {}", portName, update.getNetworkId().toString());
         if (network == null || !NeutronvpnUtils.isNetworkTypeSupported(network)) {
-            LOG.error("neutron vpn received a port update() for a network without a provider extension augmentation "
+            LOG.warn("neutron vpn received a port update() for a network without a provider extension augmentation "
                     + "or with an unsupported network type for the port {} which is part of network {}",
                     portName, network);
             return;
@@ -212,12 +236,12 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         if ((Strings.isNullOrEmpty(original.getDeviceOwner()) || Strings.isNullOrEmpty(original.getDeviceId())
                 || NeutronConstants.FLOATING_IP_DEVICE_ID_PENDING.equalsIgnoreCase(original.getDeviceId()))
                 && !Strings.isNullOrEmpty(update.getDeviceOwner()) && !Strings.isNullOrEmpty(update.getDeviceId())) {
-            if (update.getDeviceOwner().equals(NeutronConstants.DEVICE_OWNER_ROUTER_INF)) {
+            if (NeutronConstants.DEVICE_OWNER_ROUTER_INF.equals(update.getDeviceOwner())) {
                 handleRouterInterfaceAdded(update);
                 return;
             }
             if (NeutronConstants.DEVICE_OWNER_GATEWAY_INF.equals(update.getDeviceOwner())) {
-                handleRouterGatewayUpdated(update);
+                handleRouterGatewayUpdated(update, false);
             } else if (NeutronConstants.DEVICE_OWNER_FLOATING_IP.equals(update.getDeviceOwner())) {
                 handleFloatingIpPortUpdated(original, update);
             }
@@ -232,40 +256,45 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         // check if port security enabled/disabled as part of port update
         boolean origSecurityEnabled = NeutronvpnUtils.getPortSecurityEnabled(original);
         boolean updatedSecurityEnabled = NeutronvpnUtils.getPortSecurityEnabled(update);
-
-        if (origSecurityEnabled || updatedSecurityEnabled) {
+        boolean isDhcpServerPort = neutronvpnConfig.isLimitBumtrafficToDhcpserver()
+                               && NeutronvpnUtils.isDhcpServerPort(update);
+        if (origSecurityEnabled || updatedSecurityEnabled || isDhcpServerPort) {
             InstanceIdentifier<Interface>  interfaceIdentifier = NeutronvpnUtils.buildVlanInterfaceIdentifier(portName);
             jobCoordinator.enqueueJob("PORT- " + portName, () -> {
-                WriteTransaction wrtConfigTxn = dataBroker.newWriteOnlyTransaction();
-                try {
-                    Optional<Interface> optionalInf =
-                            SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.CONFIGURATION,
-                                    interfaceIdentifier);
-                    if (optionalInf.isPresent()) {
-                        InterfaceBuilder interfaceBuilder = new InterfaceBuilder(optionalInf.get());
-                        InterfaceAcl infAcl = handlePortSecurityUpdated(original, update,
-                                origSecurityEnabled, updatedSecurityEnabled, interfaceBuilder).build();
-                        interfaceBuilder.addAugmentation(InterfaceAcl.class, infAcl);
-                        LOG.info("update: Of-port-interface updation for port {}", portName);
-                        // Update OFPort interface for this neutron port
-                        wrtConfigTxn.put(LogicalDatastoreType.CONFIGURATION, interfaceIdentifier,
-                                interfaceBuilder.build());
-                    } else {
-                        LOG.warn("update: Interface {} is not present", portName);
-                    }
-                } catch (ReadFailedException e) {
-                    LOG.error("update: Failed to update interface {}", portName, e);
-                }
-                List<ListenableFuture<Void>> futures = new ArrayList<>();
-                futures.add(wrtConfigTxn.submit());
-                return futures;
+                ListenableFuture<Void> future = txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION,
+                    confTx -> {
+                        Optional<Interface> optionalInf = confTx.read(interfaceIdentifier).get();
+                        if (optionalInf.isPresent()) {
+                            InterfaceBuilder interfaceBuilder = new InterfaceBuilder(optionalInf.get());
+                            if (origSecurityEnabled || updatedSecurityEnabled) {
+                                InterfaceAcl infAcl = handlePortSecurityUpdated(original, update, origSecurityEnabled,
+                                        updatedSecurityEnabled, interfaceBuilder).build();
+                                interfaceBuilder.addAugmentation(InterfaceAcl.class, infAcl);
+                            } else if (isDhcpServerPort) {
+                                Set<FixedIps> oldIPs = getFixedIpSet(original.getFixedIps());
+                                Set<FixedIps> newIPs = getFixedIpSet(update.getFixedIps());
+                                if (!oldIPs.equals(newIPs)) {
+                                    InterfaceAcl infAcl = neutronvpnUtils.getDhcpInterfaceAcl(update);
+                                    interfaceBuilder.addAugmentation(InterfaceAcl.class, infAcl);
+                                }
+                            }
+                            LOG.info("update: Of-port-interface updation for port {}", portName);
+                            // Update OFPort interface for this neutron port
+                            confTx.put(interfaceIdentifier, interfaceBuilder.build());
+                        } else {
+                            LOG.warn("update: Interface {} is not present", portName);
+                        }
+                    });
+                ListenableFutures.addErrorLogging(future, LOG,
+                        "update: Failed to update interface {} with networkId {}", portName, network);
+                return Collections.singletonList(future);
             });
         }
     }
 
-    private void handleFloatingIpPortUpdated(Port original, Port update) {
-        if ((original == null || original.getDeviceId().equals(NeutronConstants.FLOATING_IP_DEVICE_ID_PENDING))
-            && !update.getDeviceId().equals(NeutronConstants.FLOATING_IP_DEVICE_ID_PENDING)) {
+    private void handleFloatingIpPortUpdated(@Nullable Port original, Port update) {
+        if ((original == null || NeutronConstants.FLOATING_IP_DEVICE_ID_PENDING.equals(original.getDeviceId()))
+                && !NeutronConstants.FLOATING_IP_DEVICE_ID_PENDING.equals(update.getDeviceId())) {
             // populate floating-ip uuid and floating-ip port attributes (uuid, mac and subnet id for the ONLY
             // fixed IP) to be used by NAT, depopulated in NATService once mac is retrieved in the removal path
             addToFloatingIpPortInfo(new Uuid(update.getDeviceId()), update.getUuid(), update.getFixedIps().get(0)
@@ -290,16 +319,15 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                 listVpnIds.add(vpnId);
                 Uuid internetVpnId = neutronvpnUtils.getInternetvpnUuidBoundToRouterId(routerId);
                 List<Subnetmap> subnetMapList = new ArrayList<>();
-                List<FixedIps> portIps = routerPort.getFixedIps();
                 boolean portIsIpv6 = false;
-                for (FixedIps portIP : portIps) {
+                for (FixedIps portIP : routerPort.nonnullFixedIps()) {
                     // NOTE:  Please donot change the order of calls to updateSubnetNodeWithFixedIP
                     // and addSubnetToVpn here
                     if (internetVpnId != null
                         && portIP.getIpAddress().getIpv6Address() != null) {
                         portIsIpv6 = true;
                     }
-                    String ipValue = String.valueOf(portIP.getIpAddress().getValue());
+                    String ipValue = portIP.getIpAddress().stringValue();
                     Uuid subnetId = portIP.getSubnetId();
                     nvpnManager.updateSubnetNodeWithFixedIp(subnetId, routerId,
                             routerPort.getUuid(), ipValue, routerPort.getMacAddress().getValue(), vpnId);
@@ -308,24 +336,21 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                 }
                 if (portIsIpv6) {
                     listVpnIds.add(internetVpnId);
-                    if (neutronvpnUtils.shouldVpnHandleIpVersionChoiceChangeToAdd(
-                                     IpVersionChoice.IPV6, internetVpnId)) {
-                        neutronvpnUtils.updateVpnInstanceWithIpFamily(internetVpnId.getValue(),
-                                                                     IpVersionChoice.IPV6, true);
-                        neutronvpnUtils.updateVpnInstanceWithFallback(internetVpnId.getValue(), true);
+                    if (neutronvpnUtils.shouldVpnHandleIpVersionChoiceChange(
+                                     IpVersionChoice.IPV6, routerId, true)) {
+                        neutronvpnUtils.updateVpnInstanceWithIpFamily(internetVpnId.getValue(), IpVersionChoice.IPV6,
+                                true);
+                        neutronvpnUtils.updateVpnInstanceWithFallback(routerId, internetVpnId, true);
                     }
                 }
                 if (! subnetMapList.isEmpty()) {
                     nvpnManager.createVpnInterface(listVpnIds, routerPort, null);
                 }
-                for (FixedIps portIP : routerPort.getFixedIps()) {
-                    String ipValue = String.valueOf(portIP.getIpAddress().getValue());
-                    IpVersionChoice version = neutronvpnUtils.getIpVersionFromString(ipValue);
-                    if (neutronvpnUtils.shouldVpnHandleIpVersionChoiceChangeToAdd(version, vpnId)) {
-                        neutronvpnUtils.updateVpnInstanceWithIpFamily(vpnId.getValue(),
-                               version, true);
-                    }
-                    if (version.isIpVersionChosen(IpVersionChoice.IPV4)) {
+                IpVersionChoice ipVersion = IpVersionChoice.UNDEFINED;
+                for (FixedIps portIP : routerPort.nonnullFixedIps()) {
+                    String ipValue = portIP.getIpAddress().stringValue();
+                    ipVersion = NeutronvpnUtils.getIpVersionFromString(ipValue);
+                    if (ipVersion.isIpVersionChosen(IpVersionChoice.IPV4)) {
                         nvpnManager.addSubnetToVpn(vpnId, portIP.getSubnetId(),
                                                         null /* internet-vpn-id */);
                     } else {
@@ -335,12 +360,21 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                             ipValue, routerPort.getMacAddress(),
                             routerPort.getUuid().getValue(), vpnId.getValue());
                 }
+                if (neutronvpnUtils.shouldVpnHandleIpVersionChoiceChange(ipVersion, routerId, true)) {
+                    LOG.debug("vpnInstanceOpDataEntry is getting update with ip address family {} for VPN {}",
+                            ipVersion, vpnId.getValue());
+                    neutronvpnUtils.updateVpnInstanceWithIpFamily(vpnId.getValue(), ipVersion, true);
+                }
                 nvpnManager.addToNeutronRouterInterfacesMap(routerId, routerPort.getUuid().getValue());
-                nvpnNatManager.handleSubnetsForExternalRouter(routerId);
-                WriteTransaction wrtConfigTxn = dataBroker.newWriteOnlyTransaction();
-                String portInterfaceName = createOfPortInterface(routerPort, wrtConfigTxn);
-                createElanInterface(routerPort, portInterfaceName, wrtConfigTxn);
-                wrtConfigTxn.submit();
+                jobCoordinator.enqueueJob(routerId.toString(), () -> {
+                    nvpnNatManager.handleSubnetsForExternalRouter(routerId);
+                    return Collections.emptyList();
+                });
+                ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION,
+                    confTx -> {
+                        String portInterfaceName = createOfPortInterface(routerPort, confTx);
+                        createElanInterface(routerPort, portInterfaceName, confTx);
+                    }), LOG, "Error creating ELAN interface for {}", routerPort);
             } else {
                 LOG.error("Neutron network {} corresponding to router interface port {} for neutron router {}"
                     + " already associated to VPN {}", infNetworkId.getValue(), routerPort.getUuid().getValue(),
@@ -354,11 +388,9 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             Uuid routerId = new Uuid(routerPort.getDeviceId());
             Uuid infNetworkId = routerPort.getNetworkId();
             elanService.removeKnownL3DmacAddress(routerPort.getMacAddress().getValue(), infNetworkId.getValue());
-            Uuid vpnId = neutronvpnUtils.getVpnForRouter(routerId, true);
-            if (vpnId == null) {
-                vpnId = routerId;
-            }
-            List<FixedIps> portIps = routerPort.getFixedIps();
+            Uuid vpnId = ObjectUtils.defaultIfNull(neutronvpnUtils.getVpnForRouter(routerId, true),
+                    routerId);
+            List<FixedIps> portIps = routerPort.nonnullFixedIps();
             boolean vpnInstanceInternetIpVersionRemoved = false;
             Uuid vpnInstanceInternetUuid = null;
             for (FixedIps portIP : portIps) {
@@ -383,60 +415,77 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             nvpnManager.deleteVpnInterface(routerPort.getUuid().getValue(),
                                            null /* vpn-id */, null /* wrtConfigTxn*/);
             // update RouterInterfaces map
-            WriteTransaction wrtConfigTxn = dataBroker.newWriteOnlyTransaction();
-            boolean vpnInstanceIpVersionRemoved = false;
-            IpVersionChoice vpnInstanceIpVersionToRemove = IpVersionChoice.UNDEFINED;
-            for (FixedIps portIP : portIps) {
-                Subnetmap sn = neutronvpnUtils.getSubnetmap(portIP.getSubnetId());
-                // router Port have either IPv4 or IPv6, never both
-                if (neutronvpnUtils.shouldVpnHandleIpVersionChangeToRemove(sn, vpnId)) {
-                    vpnInstanceIpVersionRemoved = true;
-                    vpnInstanceIpVersionToRemove = neutronvpnUtils.getIpVersionFromString(sn.getSubnetIp());
-                }
-                String ipValue = String.valueOf(portIP.getIpAddress().getValue());
-                neutronvpnUtils.removeVpnPortFixedIpToPort(vpnId.getValue(), ipValue, wrtConfigTxn);
-                // NOTE:  Please donot change the order of calls to removeSubnetFromVpn and
-                // and updateSubnetNodeWithFixedIP
-                nvpnManager.removeSubnetFromVpn(vpnId, portIP.getSubnetId(), sn != null ? sn.getInternetVpnId() : null);
-                nvpnManager.updateSubnetNodeWithFixedIp(portIP.getSubnetId(), null, null, null, null, null);
-            }
-            nvpnManager.removeFromNeutronRouterInterfacesMap(routerId, routerPort.getUuid().getValue());
-            deleteElanInterface(routerPort.getUuid().getValue(), wrtConfigTxn);
-            deleteOfPortInterface(routerPort, wrtConfigTxn);
-            wrtConfigTxn.submit();
-            nvpnNatManager.handleSubnetsForExternalRouter(routerId);
-            if (vpnInstanceIpVersionRemoved) {
-                neutronvpnUtils.updateVpnInstanceWithIpFamily(vpnId.getValue(), vpnInstanceIpVersionToRemove,
-                          false);
-            }
+            ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION,
+                confTx -> {
+                    IpVersionChoice ipVersion = IpVersionChoice.UNDEFINED;
+                    for (FixedIps portIP : portIps) {
+                        Subnetmap sn = neutronvpnUtils.getSubnetmap(portIP.getSubnetId());
+                        if (null == sn) {
+                            LOG.error("Subnetmap for subnet {} not found", portIP.getSubnetId().getValue());
+                            continue;
+                        }
+                        // router Port have either IPv4 or IPv6, never both
+                        ipVersion = neutronvpnUtils.getIpVersionFromString(sn.getSubnetIp());
+                        String ipValue = portIP.getIpAddress().stringValue();
+                        neutronvpnUtils.removeVpnPortFixedIpToPort(vpnId.getValue(), ipValue, confTx);
+                        // NOTE:  Please donot change the order of calls to removeSubnetFromVpn and
+                        // and updateSubnetNodeWithFixedIP
+                        nvpnManager.removeSubnetFromVpn(vpnId, sn, sn.getInternetVpnId());
+                        nvpnManager.updateSubnetNodeWithFixedIp(portIP.getSubnetId(), null, null,
+                            null, null, null);
+                    }
+                    nvpnManager.removeFromNeutronRouterInterfacesMap(routerId, routerPort.getUuid().getValue());
+                    deleteElanInterface(routerPort.getUuid().getValue(), confTx);
+                    deleteOfPortInterface(routerPort, confTx);
+                    jobCoordinator.enqueueJob(routerId.toString(), () -> {
+                        nvpnNatManager.handleSubnetsForExternalRouter(routerId);
+                        return Collections.emptyList();
+                    });
+                    if (neutronvpnUtils.shouldVpnHandleIpVersionChoiceChange(ipVersion, routerId, false)) {
+                        LOG.debug("vpnInstanceOpDataEntry is getting update with ip address family {} for VPN {}",
+                                ipVersion, vpnId.getValue());
+                        neutronvpnUtils.updateVpnInstanceWithIpFamily(vpnId.getValue(), ipVersion, false);
+                    }
+                }), LOG, "Error handling interface removal");
             if (vpnInstanceInternetIpVersionRemoved) {
                 neutronvpnUtils.updateVpnInstanceWithIpFamily(vpnInstanceInternetUuid.getValue(),
-                                                             IpVersionChoice.IPV6, false);
-                neutronvpnUtils.updateVpnInstanceWithFallback(vpnInstanceInternetUuid.getValue(), false);
+                        IpVersionChoice.IPV6, false);
+                neutronvpnUtils.updateVpnInstanceWithFallback(routerId, vpnInstanceInternetUuid, false);
             }
         }
     }
 
-    private void handleRouterGatewayUpdated(Port routerGwPort) {
+    private void handleRouterGatewayUpdated(Port routerGwPort, boolean isRtrGwRemoved) {
         Uuid routerId = new Uuid(routerGwPort.getDeviceId());
         Uuid networkId = routerGwPort.getNetworkId();
         Network network = neutronvpnUtils.getNeutronNetwork(networkId);
         if (network == null) {
             return;
         }
-        boolean isExternal = neutronvpnUtils.getIsExternal(network);
+        boolean isExternal = NeutronvpnUtils.getIsExternal(network);
         if (isExternal) {
             Uuid vpnInternetId = neutronvpnUtils.getVpnForNetwork(networkId);
             if (vpnInternetId != null) {
+                if (!isRtrGwRemoved) {
+                    nvpnManager.updateVpnMaps(vpnInternetId, null, routerId, null, null);
+                }
                 List<Subnetmap> snList = neutronvpnUtils.getNeutronRouterSubnetMaps(routerId);
                 for (Subnetmap sn : snList) {
                     if (sn.getNetworkId() == networkId) {
                         continue;
                     }
-                    if (neutronvpnUtils.getIpVersionFromString(sn.getSubnetIp()) != IpVersionChoice.IPV6) {
+                    if (NeutronvpnUtils.getIpVersionFromString(sn.getSubnetIp()) != IpVersionChoice.IPV6) {
                         continue;
                     }
-                    nvpnManager.addSubnetToVpn(null, sn.getId(), vpnInternetId);
+                    if (isRtrGwRemoved) {
+                        nvpnManager.removeV6PrivateSubnetToExtNetwork(routerId, vpnInternetId, sn);
+                    } else {
+                        nvpnManager.addV6PrivateSubnetToExtNetwork(routerId, vpnInternetId, sn);
+                    }
+                }
+                //Update Internet BGP-VPN
+                if (isRtrGwRemoved) {
+                    nvpnManager.updateVpnMaps(vpnInternetId, null, null, null, null);
                 }
             }
         }
@@ -446,11 +495,25 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         if (router == null) {
             LOG.warn("No router found for router GW port {} for router {}", routerGwPort.getUuid().getValue(),
                     routerId.getValue());
+            // NETVIRT-1249
+            eventCallbacks.onAddOrUpdate(LogicalDatastoreType.CONFIGURATION,
+                    neutronvpnUtils.getNeutronRouterIid(routerId), (unused, newRouter) -> {
+                    setupGwMac(newRouter, routerGwPort, routerId);
+                    return DataTreeEventCallbackRegistrar.NextAction.UNREGISTER;
+                }, Duration.ofSeconds(3), iid -> {
+                    LOG.error("GwPort {} added without Router", routerGwPort.getUuid().getValue());
+                });
             return;
         }
-        gwMacResolver.sendArpRequestsToExtGateways(router);
+        setupGwMac(router, routerGwPort, routerId);
+    }
 
-        setExternalGwMac(routerGwPort, routerId);
+    private void setupGwMac(Router router, Port routerGwPort, Uuid routerId) {
+        gwMacResolver.sendArpRequestsToExtGateways(router);
+        jobCoordinator.enqueueJob(routerId.toString(), () -> {
+            setExternalGwMac(routerGwPort, routerId);
+            return Collections.emptyList();
+        });
     }
 
     private void setExternalGwMac(Port routerGwPort, Uuid routerId) {
@@ -458,24 +521,31 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         // the MAC of the router's gw port is not available to be set when the
         // router is written. We catch that here.
         InstanceIdentifier<Routers> routersId = NeutronvpnUtils.buildExtRoutersIdentifier(routerId);
-        Optional<Routers> optionalRouter = MDSALUtil.read(dataBroker, LogicalDatastoreType.CONFIGURATION, routersId);
-        if (!optionalRouter.isPresent()) {
-            return;
-        }
+        Optional<Routers> optionalRouter = null;
+        try {
+            optionalRouter = MDSALUtil.read(dataBroker, LogicalDatastoreType.CONFIGURATION, routersId);
+            if (!optionalRouter.isPresent()) {
+                return;
+            }
+            Routers extRouters = optionalRouter.get();
+            if (extRouters.getExtGwMacAddress() != null) {
+                return;
+            }
 
-        Routers extRouters = optionalRouter.get();
-        if (extRouters.getExtGwMacAddress() != null) {
-            return;
+            RoutersBuilder builder = new RoutersBuilder(extRouters);
+            builder.setExtGwMacAddress(routerGwPort.getMacAddress().getValue());
+            MDSALUtil.syncWrite(dataBroker, LogicalDatastoreType.CONFIGURATION, routersId, builder.build());
+        } catch (ExecutionException | InterruptedException e) {
+            LOG.error("setExternalGwMac: failed to read EXT-Routers for router Id {} rout-Gw port {} due to exception",
+                    routerId, routerGwPort, e);
         }
 
-        RoutersBuilder builder = new RoutersBuilder(extRouters);
-        builder.setExtGwMacAddress(routerGwPort.getMacAddress().getValue());
-        MDSALUtil.syncWrite(dataBroker, LogicalDatastoreType.CONFIGURATION, routersId, builder.build());
     }
 
+    @Nullable
     private String getPortHostId(final Port port) {
         if (port != null) {
-            PortBindingExtension portBinding = port.getAugmentation(PortBindingExtension.class);
+            PortBindingExtension portBinding = port.augmentation(PortBindingExtension.class);
             if (portBinding != null) {
                 return portBinding.getHostId();
             }
@@ -483,6 +553,7 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         return null;
     }
 
+    @Nullable
     private Hostconfig getHostConfig(final Port port) {
         String hostId = getPortHostId(port);
         if (hostId == null) {
@@ -495,7 +566,7 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             LOG.error("failed to read host config from host {}", hostId, e);
             return null;
         }
-        return hostConfig.isPresent() ? hostConfig.get() : null;
+        return hostConfig.orElse(null);
     }
 
     private boolean isPortBound(final Port port) {
@@ -504,13 +575,13 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
     }
 
     private boolean isPortVnicTypeDirect(Port port) {
-        PortBindingExtension portBinding = port.getAugmentation(PortBindingExtension.class);
+        PortBindingExtension portBinding = port.augmentation(PortBindingExtension.class);
         if (portBinding == null || portBinding.getVnicType() == null) {
             // By default, VNIC_TYPE is NORMAL
             return false;
         }
         String vnicType = portBinding.getVnicType().trim().toLowerCase(Locale.getDefault());
-        return vnicType.equals(NeutronConstants.VNIC_TYPE_DIRECT);
+        return NeutronConstants.VNIC_TYPE_DIRECT.equals(vnicType);
     }
 
     private boolean isSupportedVnicTypeByHost(final Port port, final String vnicType) {
@@ -522,13 +593,14 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         return false;
     }
 
+    @Nullable
     private Map<String, JsonElement> unmarshal(final String profile) {
         if (null == profile) {
             return null;
         }
         Gson gson = new Gson();
         JsonObject jsonObject = gson.fromJson(profile, JsonObject.class);
-        Map<String, JsonElement> map = new HashMap();
+        Map<String, JsonElement> map = new HashMap<>();
         for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
             map.put(entry.getKey(), entry.getValue());
         }
@@ -540,7 +612,7 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             return false;
         }
 
-        PortBindingExtension portBinding = port.getAugmentation(PortBindingExtension.class);
+        PortBindingExtension portBinding = port.augmentation(PortBindingExtension.class);
         String profile = portBinding.getProfile();
         if (profile == null || profile.isEmpty()) {
             LOG.debug("Port {} has no binding:profile values", port.getUuid());
@@ -565,23 +637,26 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
     private void handleNeutronPortCreated(final Port port) {
         final String portName = port.getUuid().getValue();
         final Uuid portId = port.getUuid();
-        final List<FixedIps> portIpAddrsList = port.getFixedIps();
+        final String networkId = port.getNetworkId().getValue();
+        final List<FixedIps> portIpAddrsList = port.nonnullFixedIps();
         if (NeutronConstants.IS_ODL_DHCP_PORT.test(port)) {
             return;
         }
+        if (!(NeutronUtils.isPortVnicTypeNormal(port)
+                || isPortTypeSwitchdev(port)
+                && isSupportedVnicTypeByHost(port, NeutronConstants.VNIC_TYPE_DIRECT))) {
+            for (FixedIps ip: portIpAddrsList) {
+                nvpnManager.updateSubnetmapNodeWithPorts(ip.getSubnetId(), null, portId);
+            }
+            LOG.info("Port {} is not a normal and not a direct with switchdev VNIC type ;"
+                    + "OF Port interfaces are not created", portName);
+            return;
+        }
         jobCoordinator.enqueueJob("PORT- " + portName, () -> {
             // add direct port to subnetMaps config DS
-            if (!(NeutronUtils.isPortVnicTypeNormal(port)
-                || (isPortTypeSwitchdev(port)
-                && isSupportedVnicTypeByHost(port, NeutronConstants.VNIC_TYPE_DIRECT)))) {
-                for (FixedIps ip: portIpAddrsList) {
-                    nvpnManager.updateSubnetmapNodeWithPorts(ip.getSubnetId(), null, portId);
-                }
-                LOG.info("Port {} is not a normal and not a direct with switchdev VNIC type ;"
-                         + "OF Port interfaces are not created", portName);
-                return Collections.emptyList();
-            }
-            return Collections.singletonList(txRunner.callWithNewWriteOnlyTransactionAndSubmit(tx -> {
+            // TODO: for direct port as well, operations should be carried out per subnet based on port IP
+
+            ListenableFuture<Void> future = txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, tx -> {
                 LOG.info("Of-port-interface creation for port {}", portName);
                 // Create of-port interface for this neutron port
                 String portInterfaceName = createOfPortInterface(port, tx);
@@ -611,70 +686,87 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                 if (!vpnIdList.isEmpty()) {
                     // create new vpn-interface for neutron port
                     LOG.debug("handleNeutronPortCreated: Adding VPN Interface for port {} from network {}", portName,
-                            port.getNetworkId().toString());
+                            networkId);
                     nvpnManager.createVpnInterface(vpnIdList, port, tx);
-                    if (!routerIds.isEmpty()) {
-                        for (Uuid routerId : routerIds) {
-                            nvpnManager.addToNeutronRouterInterfacesMap(routerId,port.getUuid().getValue());
-                        }
+                    for (Uuid routerId : routerIds) {
+                        nvpnManager.addToNeutronRouterInterfacesMap(routerId,port.getUuid().getValue());
                     }
                 }
-            }));
+            });
+            ListenableFutures.addErrorLogging(future, LOG,
+                    "handleNeutronPortCreated: Failed for port {} with networkId {}", portName, networkId);
+            return Collections.singletonList(future);
         });
     }
 
     private void handleNeutronPortDeleted(final Port port) {
         final String portName = port.getUuid().getValue();
         final Uuid portId = port.getUuid();
-        final List<FixedIps> portIpsList = port.getFixedIps();
-        jobCoordinator.enqueueJob("PORT- " + portName, () -> {
-            WriteTransaction wrtConfigTxn = dataBroker.newWriteOnlyTransaction();
-            List<ListenableFuture<Void>> futures = new ArrayList<>();
-            if (!(NeutronUtils.isPortVnicTypeNormal(port) || isPortTypeSwitchdev(port))) {
-                for (FixedIps ip: portIpsList) {
-                    // remove direct port from subnetMaps config DS
-                    nvpnManager.removePortsFromSubnetmapNode(ip.getSubnetId(), null, portId);
-                }
-                LOG.info("Port {} is not a normal and not a direct with switchdev VNIC type ;"
-                         + "Skipping OF Port interfaces removal", portName);
-                return futures;
+        final List<FixedIps> portIpsList = port.nonnullFixedIps();
+        if (!(NeutronUtils.isPortVnicTypeNormal(port) || isPortTypeSwitchdev(port))) {
+            for (FixedIps ip : portIpsList) {
+                // remove direct port from subnetMaps config DS
+                // TODO: for direct port as well, operations should be carried out per subnet based on port IP
+                nvpnManager.removePortsFromSubnetmapNode(ip.getSubnetId(), null, portId);
             }
-            Uuid vpnId = null;
-            Set<Uuid> routerIds = new HashSet<>();
-            Uuid internetVpnId = null;
-            for (FixedIps ip: portIpsList) {
-                Subnetmap subnetMap = nvpnManager.removePortsFromSubnetmapNode(ip.getSubnetId(), portId, null);
-                if (subnetMap == null) {
-                    continue;
-                }
-                if (subnetMap.getVpnId() != null) {
-                    // can't use NeutronvpnUtils.getVpnForNetwork to optimise here, because it gives BGPVPN id
-                    // obtained subnetMaps belongs to one network => vpnId must be the same for each port Ip
-                    vpnId = subnetMap.getVpnId();
-                }
-                if (subnetMap.getRouterId() != null) {
-                    routerIds.add(subnetMap.getRouterId());
+            LOG.info("Port {} is not a normal and not a direct with switchdev VNIC type ;"
+                    + "Skipping OF Port interfaces removal", portName);
+            return;
+        }
+        jobCoordinator.enqueueJob("PORT- " + portName, () -> {
+            ListenableFuture<Void> future = txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, confTx -> {
+
+                Uuid vpnId = null;
+                Set<Uuid> routerIds = new HashSet<>();
+                Uuid internetVpnId = null;
+                for (FixedIps ip : portIpsList) {
+                    Subnetmap subnetMap = nvpnManager.removePortsFromSubnetmapNode(ip.getSubnetId(), portId, null);
+                    if (subnetMap == null) {
+                        continue;
+                    }
+                    if (subnetMap.getVpnId() != null) {
+                        // can't use NeutronvpnUtils.getVpnForNetwork to optimise here, because it gives BGPVPN id
+                        // obtained subnetMaps belongs to one network => vpnId must be the same for each port Ip
+                        vpnId = subnetMap.getVpnId();
+                    }
+                    if (subnetMap.getRouterId() != null) {
+                        routerIds.add(subnetMap.getRouterId());
+                    }
+                    internetVpnId = subnetMap.getInternetVpnId();
+
+                    if (NeutronConstants.DEVICE_OWNER_GATEWAY_INF.equals(port.getDeviceOwner())
+                        || NeutronConstants.DEVICE_OWNER_FLOATING_IP.equals(port.getDeviceOwner())) {
+                        String ipAddress = ip.getIpAddress().stringValue();
+                        if (vpnId != null) {
+                            neutronvpnUtils.removeVpnPortFixedIpToPort(vpnId.getValue(), ipAddress, confTx);
+                        }
+                        if (internetVpnId != null) {
+                            neutronvpnUtils.removeVpnPortFixedIpToPort(internetVpnId.getValue(),
+                                ipAddress, confTx);
+                        }
+                    }
                 }
-                internetVpnId = subnetMap.getInternetVpnId();
-            }
-            if (vpnId != null || internetVpnId != null) {
-                // remove vpn-interface for this neutron port
-                LOG.debug("removing VPN Interface for port {}", portName);
-                if (!routerIds.isEmpty()) {
-                    for (Uuid routerId : routerIds) {
-                        nvpnManager.removeFromNeutronRouterInterfacesMap(routerId, portName);
+                if (vpnId != null || internetVpnId != null) {
+                    // remove vpn-interface for this neutron port
+                    LOG.debug("removing VPN Interface for port {}", portName);
+                    if (!routerIds.isEmpty()) {
+                        for (Uuid routerId : routerIds) {
+                            nvpnManager.removeFromNeutronRouterInterfacesMap(routerId, portName);
+                        }
                     }
+                    nvpnManager.deleteVpnInterface(portName, null /* vpn-id */, confTx);
                 }
-                nvpnManager.deleteVpnInterface(portName, null /* vpn-id */, wrtConfigTxn);
-            }
-            // Remove of-port interface for this neutron port
-            // ELAN interface is also implicitly deleted as part of this operation
-            LOG.debug("Of-port-interface removal for port {}", portName);
-            deleteOfPortInterface(port, wrtConfigTxn);
-            //dissociate fixedIP from floatingIP if associated
-            nvpnManager.dissociatefixedIPFromFloatingIP(port.getUuid().getValue());
-            futures.add(wrtConfigTxn.submit());
-            return futures;
+                // Remove of-port interface for this neutron port
+                // ELAN interface is also implicitly deleted as part of this operation
+                LOG.debug("Of-port-interface removal for port {}", portName);
+                deleteOfPortInterface(port, confTx);
+                //dissociate fixedIP from floatingIP if associated
+                nvpnManager.dissociatefixedIPFromFloatingIP(port.getUuid().getValue());
+            });
+            ListenableFutures.addErrorLogging(future, LOG,
+                    "handleNeutronPortDeleted: Failed to update interface {} with networkId", portName,
+                    port.getNetworkId().getValue());
+            return Collections.singletonList(future);
         });
     }
 
@@ -692,15 +784,19 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                       + "during subnet deletion event.", portupdate.getUuid().getValue());
             return;
         }
+
+        if (NeutronConstants.IS_ODL_DHCP_PORT.test(portupdate)) {
+            return;
+        }
+
         jobCoordinator.enqueueJob("PORT- " + portupdate.getUuid().getValue(),
-            () -> Collections.singletonList(txRunner.callWithNewWriteOnlyTransactionAndSubmit(tx -> {
+            () -> Collections.singletonList(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, confTx -> {
                 final List<Uuid> originalSnMapsIds = portoriginalIps.stream().map(FixedIps::getSubnetId)
                         .collect(Collectors.toList());
                 final List<Uuid> updateSnMapsIds = portupdateIps.stream().map(FixedIps::getSubnetId)
                         .collect(Collectors.toList());
                 Set<Uuid> originalRouterIds = new HashSet<>();
                 Set<Uuid> oldVpnIds = new HashSet<>();
-                Uuid oldRouterId = null;
                 for (Uuid snId: originalSnMapsIds) {
                     if (!updateSnMapsIds.remove(snId)) {
                         // snId was present in originalSnMapsIds, but not in updateSnMapsIds
@@ -717,7 +813,7 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                         }
                     }
                 }
-                Set<Uuid> newVpnIds = new HashSet();
+                Set<Uuid> newVpnIds = new HashSet<>();
                 Set<Uuid> newRouterIds = new HashSet<>();
                 for (Uuid snId: updateSnMapsIds) {
                     Subnetmap subnetMapNew = nvpnManager.updateSubnetmapNodeWithPorts(snId, portupdate.getUuid(), null);
@@ -733,7 +829,6 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                         }
                     }
                 }
-                WriteTransaction wrtConfigTxn = dataBroker.newWriteOnlyTransaction();
                 if (!oldVpnIds.isEmpty()) {
                     LOG.info("removing VPN Interface for port {}", portoriginal.getUuid().getValue());
                     if (!originalRouterIds.isEmpty()) {
@@ -743,11 +838,11 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                         }
                     }
                     nvpnManager.deleteVpnInterface(portoriginal.getUuid().getValue(),
-                                                   null /* vpn-id */, wrtConfigTxn);
+                                                   null /* vpn-id */, confTx);
                 }
                 if (!newVpnIds.isEmpty()) {
                     LOG.info("Adding VPN Interface for port {}", portupdate.getUuid().getValue());
-                    nvpnManager.createVpnInterface(newVpnIds, portupdate, wrtConfigTxn);
+                    nvpnManager.createVpnInterface(newVpnIds, portupdate, confTx);
                     if (!newRouterIds.isEmpty()) {
                         for (Uuid routerId : newRouterIds) {
                             nvpnManager.addToNeutronRouterInterfacesMap(routerId,portupdate.getUuid().getValue());
@@ -757,7 +852,8 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             })));
     }
 
-    private static InterfaceAclBuilder handlePortSecurityUpdated(Port portOriginal,
+    @Nullable
+    private InterfaceAclBuilder handlePortSecurityUpdated(Port portOriginal,
             Port portUpdated, boolean origSecurityEnabled, boolean updatedSecurityEnabled,
             InterfaceBuilder interfaceBuilder) {
         InterfaceAclBuilder interfaceAclBuilder = null;
@@ -766,16 +862,17 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
             interfaceAclBuilder.setPortSecurityEnabled(updatedSecurityEnabled);
             if (updatedSecurityEnabled) {
                 // Handle security group enabled
-                NeutronvpnUtils.populateInterfaceAclBuilder(interfaceAclBuilder, portUpdated);
+                neutronvpnUtils.populateInterfaceAclBuilder(interfaceAclBuilder, portUpdated);
             } else {
                 // Handle security group disabled
                 interfaceAclBuilder.setSecurityGroups(new ArrayList<>());
                 interfaceAclBuilder.setAllowedAddressPairs(new ArrayList<>());
+                interfaceAclBuilder.setSubnetInfo(new ArrayList<>());
             }
         } else {
             if (updatedSecurityEnabled) {
                 // handle SG add/delete delta
-                InterfaceAcl interfaceAcl = interfaceBuilder.getAugmentation(InterfaceAcl.class);
+                InterfaceAcl interfaceAcl = interfaceBuilder.augmentation(InterfaceAcl.class);
                 interfaceAclBuilder = new InterfaceAclBuilder(interfaceAcl);
                 interfaceAclBuilder.setSecurityGroups(
                         NeutronvpnUtils.getUpdatedSecurityGroups(interfaceAcl.getSecurityGroups(),
@@ -786,12 +883,17 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                 interfaceAclBuilder.setAllowedAddressPairs(NeutronvpnUtils.getAllowedAddressPairsForFixedIps(
                         updatedAddressPairs, portOriginal.getMacAddress(), portOriginal.getFixedIps(),
                         portUpdated.getFixedIps()));
+
+                if (portOriginal.getFixedIps() != null
+                        && !portOriginal.getFixedIps().equals(portUpdated.getFixedIps())) {
+                    neutronvpnUtils.populateSubnetInfo(interfaceAclBuilder, portUpdated);
+                }
             }
         }
         return interfaceAclBuilder;
     }
 
-    private String createOfPortInterface(Port port, WriteTransaction wrtConfigTxn) {
+    private String createOfPortInterface(Port port, TypedWriteTransaction<Datastore.Configuration> wrtConfigTxn) {
         Interface inf = createInterface(port);
         String infName = inf.getName();
 
@@ -801,21 +903,74 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                     SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.CONFIGURATION,
                             interfaceIdentifier);
             if (!optionalInf.isPresent()) {
-                wrtConfigTxn.put(LogicalDatastoreType.CONFIGURATION, interfaceIdentifier, inf);
+                wrtConfigTxn.put(interfaceIdentifier, inf);
+            } else if (isInterfaceUpdated(inf, optionalInf.get())) {
+               /*
+                Case where an update DTCN wasn't received by this class due to node going down
+                upon cluster reboot or any other unknown reason
+                In such a case, updates contained in the missed DTCN won't be processed and have to be handled
+                explicitly
+                Update of subports (vlanId, splithorizon tag) is handled here
+                Update of portSecurity (PortSecurityEnabled, SecurityGroups, AllowedAddressPairs) add is handled
+                Update of portSecurity update/removed is not handled
+                Update of parentrefs is not handled as parentrefs updation is handled by IFM Oxygen onwards
+                */
+                wrtConfigTxn.put(interfaceIdentifier, inf);
+                LOG.error("Interface {} is already present and is updated", infName);
             } else {
                 LOG.warn("Interface {} is already present", infName);
             }
-        } catch (ReadFailedException e) {
+        } catch (ExecutionException | InterruptedException e) {
             LOG.error("failed to create interface {}", infName, e);
         }
         return infName;
     }
 
+    // Not for generic use. For a special case where update DTCN isn't received
+    private static boolean isInterfaceUpdated(Interface newInterface, Interface oldInterface) {
+        if (newInterface.augmentation(SplitHorizon.class) != null) {
+            if (oldInterface.augmentation(SplitHorizon.class) == null) {
+                return true;
+            }
+            if (!newInterface.augmentation(SplitHorizon.class).equals(oldInterface
+                    .augmentation(SplitHorizon.class))) {
+                return true;
+            }
+        }
+        if (!newInterface.augmentation(IfL2vlan.class).equals(oldInterface.augmentation(IfL2vlan.class))) {
+            return true;
+        }
+        if (newInterface.augmentation(InterfaceAcl.class) != null && oldInterface
+                .augmentation(InterfaceAcl.class) == null) {
+            return true;
+        }
+        return false;
+    }
+
     private Interface createInterface(Port port) {
         String interfaceName = port.getUuid().getValue();
         IfL2vlan.L2vlanMode l2VlanMode = IfL2vlan.L2vlanMode.Trunk;
         InterfaceBuilder interfaceBuilder = new InterfaceBuilder();
         IfL2vlanBuilder ifL2vlanBuilder = new IfL2vlanBuilder();
+
+        Network network = neutronvpnUtils.getNeutronNetwork(port.getNetworkId());
+        Boolean isVlanTransparent = network.isVlanTransparent();
+        if (isVlanTransparent != null && isVlanTransparent) {
+            l2VlanMode = IfL2vlan.L2vlanMode.Transparent;
+        } else {
+            PortIdToSubport portIdToSubport = neutronvpnUtils.getPortIdToSubport(port.getUuid());
+            if (portIdToSubport != null) {
+                l2VlanMode = IfL2vlan.L2vlanMode.TrunkMember;
+                ifL2vlanBuilder.setVlanId(new VlanId(portIdToSubport.getVlanId().intValue()));
+                String parentRefName = portIdToSubport.getTrunkPortId().getValue();
+                ParentRefsBuilder parentRefsBuilder = new ParentRefsBuilder().setParentInterface(parentRefName);
+                interfaceBuilder.addAugmentation(ParentRefs.class, parentRefsBuilder.build());
+                SplitHorizon splitHorizon =
+                        new SplitHorizonBuilder().setOverrideSplitHorizonProtection(true).build();
+                interfaceBuilder.addAugmentation(SplitHorizon.class, splitHorizon);
+            }
+        }
+
         ifL2vlanBuilder.setL2vlanMode(l2VlanMode);
 
         interfaceBuilder.setEnabled(true).setName(interfaceName).setType(L2vlan.class)
@@ -824,14 +979,15 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
         if (NeutronvpnUtils.getPortSecurityEnabled(port)) {
             InterfaceAclBuilder interfaceAclBuilder = new InterfaceAclBuilder();
             interfaceAclBuilder.setPortSecurityEnabled(true);
-            NeutronvpnUtils.populateInterfaceAclBuilder(interfaceAclBuilder, port);
+            neutronvpnUtils.populateInterfaceAclBuilder(interfaceAclBuilder, port);
             interfaceBuilder.addAugmentation(InterfaceAcl.class, interfaceAclBuilder.build());
-            neutronvpnUtils.populateSubnetIpPrefixes(port);
+        } else if (neutronvpnConfig.isLimitBumtrafficToDhcpserver() && NeutronvpnUtils.isDhcpServerPort(port)) {
+            interfaceBuilder.addAugmentation(InterfaceAcl.class, neutronvpnUtils.getDhcpInterfaceAcl(port));
         }
         return interfaceBuilder.build();
     }
 
-    private void deleteOfPortInterface(Port port, WriteTransaction wrtConfigTxn) {
+    private void deleteOfPortInterface(Port port, TypedWriteTransaction<Datastore.Configuration> wrtConfigTxn) {
         String name = port.getUuid().getValue();
         LOG.debug("Removing OFPort Interface {}", name);
         InstanceIdentifier<Interface>  interfaceIdentifier = NeutronvpnUtils.buildVlanInterfaceIdentifier(name);
@@ -840,41 +996,42 @@ public class NeutronPortChangeListener extends AsyncDataTreeChangeListenerBase<P
                     SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.CONFIGURATION,
                             interfaceIdentifier);
             if (optionalInf.isPresent()) {
-                wrtConfigTxn.delete(LogicalDatastoreType.CONFIGURATION, interfaceIdentifier);
+                wrtConfigTxn.delete(interfaceIdentifier);
             } else {
                 LOG.warn("deleteOfPortInterface: Interface {} is not present", name);
             }
-        } catch (ReadFailedException e) {
+        } catch (ExecutionException | InterruptedException e) {
             LOG.error("deleteOfPortInterface: Failed to delete interface {}", name, e);
         }
     }
 
-    private void createElanInterface(Port port, String name, WriteTransaction wrtConfigTxn) {
+    private void createElanInterface(Port port, String name,
+                                     TypedWriteTransaction<Datastore.Configuration> wrtConfigTxn) {
         String elanInstanceName = port.getNetworkId().getValue();
         List<StaticMacEntries> staticMacEntries = NeutronvpnUtils.buildStaticMacEntry(port);
 
         InstanceIdentifier<ElanInterface> id = InstanceIdentifier.builder(ElanInterfaces.class).child(ElanInterface
                 .class, new ElanInterfaceKey(name)).build();
         ElanInterface elanInterface = new ElanInterfaceBuilder().setElanInstanceName(elanInstanceName)
-                .setName(name).setStaticMacEntries(staticMacEntries).setKey(new ElanInterfaceKey(name)).build();
-        wrtConfigTxn.put(LogicalDatastoreType.CONFIGURATION, id, elanInterface);
+                .setName(name).setStaticMacEntries(staticMacEntries).withKey(new ElanInterfaceKey(name)).build();
+        wrtConfigTxn.put(id, elanInterface);
         LOG.debug("Creating new ELan Interface {}", elanInterface);
     }
 
-    private void deleteElanInterface(String name, WriteTransaction wrtConfigTxn) {
+    private void deleteElanInterface(String name, TypedWriteTransaction<Datastore.Configuration> wrtConfigTxn) {
         InstanceIdentifier<ElanInterface> id = InstanceIdentifier.builder(ElanInterfaces.class).child(ElanInterface
                 .class, new ElanInterfaceKey(name)).build();
-        wrtConfigTxn.delete(LogicalDatastoreType.CONFIGURATION, id);
+        wrtConfigTxn.delete(id);
     }
 
     // TODO Clean up the exception handling
     @SuppressWarnings("checkstyle:IllegalCatch")
     private void addToFloatingIpPortInfo(Uuid floatingIpId, Uuid floatingIpPortId, Uuid floatingIpPortSubnetId, String
                                          floatingIpPortMacAddress) {
-        InstanceIdentifier id = buildfloatingIpIdToPortMappingIdentifier(floatingIpId);
+        InstanceIdentifier id = NeutronvpnUtils.buildfloatingIpIdToPortMappingIdentifier(floatingIpId);
         try {
             FloatingIpIdToPortMappingBuilder floatingipIdToPortMacMappingBuilder = new
-                FloatingIpIdToPortMappingBuilder().setKey(new FloatingIpIdToPortMappingKey(floatingIpId))
+                FloatingIpIdToPortMappingBuilder().withKey(new FloatingIpIdToPortMappingKey(floatingIpId))
                 .setFloatingIpId(floatingIpId).setFloatingIpPortId(floatingIpPortId)
                 .setFloatingIpPortSubnetId(floatingIpPortSubnetId)
                 .setFloatingIpPortMacAddress(floatingIpPortMacAddress);