itm/itm-impl/src/main/java/org/opendaylight/genius/itm/confighelpers/ItmExternalTunnelAddWorker.java

   1 /*
   2  * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.genius.itm.confighelpers;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.util.concurrent.FutureCallback;
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import org.apache.commons.net.util.SubnetUtils;
  14 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  15 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  16 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  17 import org.opendaylight.genius.itm.globals.ITMConstants;
  18 import org.opendaylight.genius.itm.impl.ItmUtils;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
  21 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.Interfaces;
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
  23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.InterfaceKey;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.IdManagerService;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.TunnelMonitoringTypeBase;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.TunnelTypeBase;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.TunnelTypeVxlan;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.ExternalTunnelList;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.DPNTEPsInfo;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.TunnelEndPoints;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.tunnel.end.points.TzMembership;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.external.tunnel.list.ExternalTunnel;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.external.tunnel.list.ExternalTunnelKey;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.TransportZones;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZone;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZoneKey;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.Subnets;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.DeviceVteps;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.Vteps;
  40 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  41 import org.slf4j.Logger;
  42 import org.slf4j.LoggerFactory;
  43
  44 import java.math.BigInteger;
  45 import java.util.ArrayList;
  46 import java.util.List;
  47
  48 public class ItmExternalTunnelAddWorker {
  49     private static final Logger logger = LoggerFactory.getLogger(ItmExternalTunnelAddWorker.class);
  50
  51     private static Boolean monitorEnabled;
  52     private static Integer monitorInterval;
  53     private static Class<? extends TunnelMonitoringTypeBase> monitorProtocol;
  54
  55     private static final FutureCallback<Void> DEFAULT_CALLBACK =
  56             new FutureCallback<Void>() {
  57                 @Override
  58                 public void onSuccess(Void result) {
  59                     logger.debug("Success in Datastore operation");
  60                 }
  61
  62                 @Override
  63                 public void onFailure(Throwable error) {
  64                     logger.error("Error in Datastore operation", error);
  65                 }
  66
  67             };
  68
  69     public static List<ListenableFuture<Void>> buildTunnelsToExternalEndPoint(DataBroker dataBroker, IdManagerService idManagerService,
  70                                                                               List<DPNTEPsInfo> cfgDpnList, IpAddress extIp, Class<? extends TunnelTypeBase> tunType) {
  71         List<ListenableFuture<Void>> futures = new ArrayList<>();
  72         WriteTransaction t = dataBroker.newWriteOnlyTransaction();
  73         if (null != cfgDpnList) {
  74             for (DPNTEPsInfo teps : cfgDpnList) {
  75                 // CHECK -- Assumption -- Only one End Point / Dpn for GRE/Vxlan Tunnels
  76                 TunnelEndPoints firstEndPt = teps.getTunnelEndPoints().get(0);
  77                 String interfaceName = firstEndPt.getInterfaceName();
  78                 String tunTypeStr = tunType.getName();
  79                 String trunkInterfaceName = ItmUtils.getTrunkInterfaceName(idManagerService, interfaceName, firstEndPt.getIpAddress().getIpv4Address().getValue(), extIp.getIpv4Address().getValue(), tunTypeStr);
  80                 char[] subnetMaskArray = firstEndPt.getSubnetMask().getValue();
  81                 boolean useOfTunnel = ItmUtils.falseIfNull(firstEndPt.isOptionOfTunnel());
  82                 String subnetMaskStr = String.valueOf(subnetMaskArray);
  83                 SubnetUtils utils = new SubnetUtils(subnetMaskStr);
  84                 String dcGwyIpStr = String.valueOf(extIp.getValue());
  85                 IpAddress gatewayIpObj = new IpAddress("0.0.0.0".toCharArray());
  86                 IpAddress gwyIpAddress = utils.getInfo().isInRange(dcGwyIpStr) ? gatewayIpObj : firstEndPt.getGwIpAddress();
  87                 logger.debug(" Creating Trunk Interface with parameters trunk I/f Name - {}, parent I/f name - {}, source IP - {}, DC Gateway IP - {} gateway IP - {}", trunkInterfaceName, interfaceName, firstEndPt.getIpAddress(), extIp, gwyIpAddress);
  88                 Interface iface = ItmUtils.buildTunnelInterface(teps.getDPNID(), trunkInterfaceName,
  89                     String.format("%s %s", ItmUtils.convertTunnelTypetoString(tunType), "Trunk Interface"), true,
  90                     tunType, firstEndPt.getIpAddress(), extIp, gwyIpAddress, firstEndPt.getVLANID(), false, false,
  91                     ITMConstants.DEFAULT_MONITOR_PROTOCOL, null, useOfTunnel);
  92
  93                 logger.debug(" Trunk Interface builder - {} ", iface);
  94                 InstanceIdentifier<Interface> trunkIdentifier = ItmUtils.buildId(trunkInterfaceName);
  95                 logger.debug(" Trunk Interface Identifier - {} ", trunkIdentifier);
  96                 logger.trace(" Writing Trunk Interface to Config DS {}, {} ", trunkIdentifier, iface);
  97                 t.merge(LogicalDatastoreType.CONFIGURATION, trunkIdentifier, iface, true);
  98                 // update external_tunnel_list ds
  99                 InstanceIdentifier<ExternalTunnel> path = InstanceIdentifier.create(
 100                         ExternalTunnelList.class)
 101                         .child(ExternalTunnel.class, new ExternalTunnelKey(extIp.toString(), teps.getDPNID().toString(), tunType));
 102                 ExternalTunnel tnl = ItmUtils.buildExternalTunnel(  teps.getDPNID().toString(), extIp.toString(),
 103                         tunType, trunkInterfaceName);
 104                 t.merge(LogicalDatastoreType.CONFIGURATION, path, tnl, true);
 105             }
 106             futures.add(t.submit());
 107         }
 108         return futures;
 109     }
 110
 111     public static List<ListenableFuture<Void>> buildTunnelsFromDpnToExternalEndPoint(DataBroker dataBroker, IdManagerService idManagerService,
 112                                                                                      List<BigInteger> dpnId, IpAddress extIp, Class<? extends TunnelTypeBase> tunType) {
 113         List<ListenableFuture<Void>> futures = new ArrayList<>();
 114         List<DPNTEPsInfo> cfgDpnList = dpnId == null ? ItmUtils.getTunnelMeshInfo(dataBroker) : ItmUtils.getDPNTEPListFromDPNId(dataBroker, dpnId);
 115         futures = buildTunnelsToExternalEndPoint(dataBroker, idManagerService, cfgDpnList, extIp, tunType);
 116         return futures;
 117     }
 118
 119     public static List<ListenableFuture<Void>> buildHwVtepsTunnels(DataBroker dataBroker, IdManagerService idManagerService, List<DPNTEPsInfo> cfgdDpnList, List<HwVtep> cfgdHwVteps) {
 120         List<ListenableFuture<Void>> futures = new ArrayList<>();
 121         WriteTransaction t = dataBroker.newWriteOnlyTransaction();
 122         monitorInterval = ITMConstants.BFD_DEFAULT_MONITOR_INTERVAL;
 123         monitorProtocol = ITMConstants.DEFAULT_MONITOR_PROTOCOL;
 124         monitorEnabled = ItmUtils.readMonitoringStateFromCache(dataBroker);
 125         if (null != cfgdDpnList && !cfgdDpnList.isEmpty()) {
 126             logger.trace("calling tunnels from css {}",cfgdDpnList);
 127             tunnelsFromCSS(cfgdDpnList, idManagerService , futures, t , dataBroker);
 128
 129         }
 130         if (null != cfgdHwVteps && !cfgdHwVteps.isEmpty() ) {
 131             logger.trace("calling tunnels from hwTep {}",cfgdHwVteps);
 132             tunnelsFromhWVtep(cfgdHwVteps, idManagerService, futures, t, dataBroker);
 133         }
 134
 135         if (cfgdDpnList != null && !cfgdDpnList.isEmpty() || cfgdHwVteps != null && !cfgdHwVteps.isEmpty()) {
 136             futures.add(t.submit());
 137         }
 138         return futures;
 139     }
 140
 141     private static void tunnelsFromCSS(List<DPNTEPsInfo> cfgdDpnList, IdManagerService idManagerService, List<ListenableFuture<Void>> futures, WriteTransaction t, DataBroker dataBroker) {
 142         Boolean monitorEnabled = ItmUtils.readMonitoringStateFromCache(dataBroker);
 143         Class<? extends TunnelMonitoringTypeBase> monitorProtocol = ITMConstants.DEFAULT_MONITOR_PROTOCOL;
 144         for (DPNTEPsInfo dpn : cfgdDpnList) {
 145             logger.trace("processing dpn {}" , dpn);
 146             if (dpn.getTunnelEndPoints() != null && !dpn.getTunnelEndPoints().isEmpty()) {
 147                 for (TunnelEndPoints tep : dpn.getTunnelEndPoints()) {
 148                     for(TzMembership zone: tep.getTzMembership()) {
 149                         createTunnelsFromCSSinTransportZone(zone.getZoneName(), dpn, tep, idManagerService, futures, t, dataBroker);
 150                     }
 151                 }
 152             }
 153         }
 154     }
 155
 156     private static void createTunnelsFromCSSinTransportZone(String zoneName, DPNTEPsInfo dpn, TunnelEndPoints tep, IdManagerService idManagerService, List<ListenableFuture<Void>> futures, WriteTransaction t, DataBroker dataBroker) {
 157         InstanceIdentifier<TransportZone> tzonePath = InstanceIdentifier.builder(TransportZones.class).child(TransportZone.class, new TransportZoneKey(zoneName)).build();
 158         Optional<TransportZone> tZoneOptional = ItmUtils.read(LogicalDatastoreType.CONFIGURATION, tzonePath, dataBroker);
 159         if (tZoneOptional.isPresent()) {
 160             TransportZone tZone = tZoneOptional.get();
 161             //do we need to check tunnel type?
 162             if (tZone.getSubnets() != null && !tZone.getSubnets().isEmpty()) {
 163                 for (Subnets sub : tZone.getSubnets()) {
 164                     if (sub.getDeviceVteps() != null && !sub.getDeviceVteps().isEmpty()) {
 165                         for (DeviceVteps hwVtepDS : sub.getDeviceVteps()) {
 166                             //dont mesh if hwVteps and CSS-tep have same ip-address
 167                             if(hwVtepDS.getIpAddress().equals(tep.getIpAddress())) {
 168                                 continue;
 169                             }
 170                             String cssID = dpn.getDPNID().toString();
 171                             String nodeId = hwVtepDS.getNodeId();
 172                             boolean useOfTunnel = ItmUtils.falseIfNull(tep.isOptionOfTunnel());
 173                             logger.trace("wire up {} and {}",tep, hwVtepDS);
 174                             if (!wireUp(dpn.getDPNID(), tep.getPortname(), sub.getVlanId(),
 175                                     tep.getIpAddress(), useOfTunnel, nodeId, hwVtepDS.getIpAddress(),
 176                                     tep.getSubnetMask(), sub.getGatewayIp(), sub.getPrefix(),
 177                                     tZone.getTunnelType(), false, monitorProtocol, monitorInterval,
 178                                     idManagerService, dataBroker, futures, t)) {
 179                                 logger.error("Unable to build tunnel {} -- {}", tep.getIpAddress(), hwVtepDS.getIpAddress());
 180                             }
 181                             //TOR-CSS
 182                             logger.trace("wire up {} and {}", hwVtepDS,tep);
 183                             if (!wireUp(hwVtepDS.getTopologyId(), hwVtepDS.getNodeId(), hwVtepDS.getIpAddress(), cssID, tep.getIpAddress(), sub.getPrefix(),
 184                                     sub.getGatewayIp(), tep.getSubnetMask(), tZone.getTunnelType(), false, monitorProtocol, monitorInterval, idManagerService, dataBroker, futures, t)) {
 185                                 logger.error("Unable to build tunnel {} -- {}", hwVtepDS.getIpAddress(), tep.getIpAddress());
 186                             }
 187
 188                         }
 189                     }
 190                 }
 191             }
 192         }
 193     }
 194
 195     private static void tunnelsFromhWVtep(List<HwVtep> cfgdHwVteps, IdManagerService idManagerService, List<ListenableFuture<Void>> futures, WriteTransaction t, DataBroker dataBroker) {
 196         for (HwVtep hwTep : cfgdHwVteps) {
 197             InstanceIdentifier<TransportZone> tzonePath = InstanceIdentifier.builder(TransportZones.class).child(TransportZone.class, new TransportZoneKey(hwTep.getTransportZone())).build();
 198             Optional<TransportZone> tZoneOptional = ItmUtils.read(LogicalDatastoreType.CONFIGURATION, tzonePath, dataBroker);
 199             Class<? extends TunnelTypeBase> tunType = TunnelTypeVxlan.class;
 200             Boolean monitorEnabled = ItmUtils.readMonitoringStateFromCache(dataBroker);
 201             Class<? extends TunnelMonitoringTypeBase> monitorProtocol = ITMConstants.DEFAULT_MONITOR_PROTOCOL;
 202             if (tZoneOptional.isPresent()) {
 203                 TransportZone tZone = tZoneOptional.get();
 204                 //do we need to check tunnel type?
 205                 if (tZone.getSubnets() != null && !tZone.getSubnets().isEmpty()) {
 206                     for (Subnets sub : tZone.getSubnets()) {
 207                         if (sub.getDeviceVteps() != null && !sub.getDeviceVteps().isEmpty()) {
 208                             for (DeviceVteps hwVtepDS : sub.getDeviceVteps()) {
 209                                 if (hwVtepDS.getIpAddress().equals(hwTep.getHwIp()))
 210                                  {
 211                                     continue;//dont mesh with self
 212                                 }
 213                                 logger.trace("wire up {} and {}",hwTep, hwVtepDS);
 214                                 if (!wireUp(hwTep.getTopo_id(), hwTep.getNode_id(), hwTep.getHwIp(), hwVtepDS.getNodeId(), hwVtepDS.getIpAddress(),
 215                                         hwTep.getIpPrefix(), hwTep.getGatewayIP(), sub.getPrefix(), tunType,false,monitorProtocol,
 216                                                 monitorInterval, idManagerService, dataBroker, futures, t)) {
 217                                     logger.error("Unable to build tunnel {} -- {}", hwTep.getHwIp(), hwVtepDS.getIpAddress());
 218                                 }
 219                                 //TOR2-TOR1
 220                                 logger.trace("wire up {} and {}", hwVtepDS,hwTep);
 221                                 if (!wireUp(hwTep.getTopo_id(), hwVtepDS.getNodeId(), hwVtepDS.getIpAddress(), hwTep.getNode_id(), hwTep.getHwIp(),
 222                                         sub.getPrefix(), sub.getGatewayIp(), hwTep.getIpPrefix(), tunType, false,monitorProtocol, monitorInterval, idManagerService, dataBroker, futures, t)) {
 223                                     logger.error("Unable to build tunnel {} -- {}", hwVtepDS.getIpAddress(), hwTep.getHwIp());
 224                                 }
 225                             }
 226                         }
 227                         if (sub.getVteps() != null && !sub.getVteps().isEmpty()) {
 228                             for (Vteps vtep : sub.getVteps()) {
 229                                 if(vtep.getIpAddress().equals(hwTep.getHwIp())) {
 230                                     continue;
 231                                 }
 232                                 //TOR-CSS
 233                                 String cssID = vtep.getDpnId().toString();
 234                                 logger.trace("wire up {} and {}",hwTep, vtep);
 235                                 if(!wireUp(hwTep.getTopo_id(), hwTep.getNode_id(), hwTep.getHwIp(), cssID, vtep.getIpAddress(), hwTep.getIpPrefix(),
 236                                         hwTep.getGatewayIP(), sub.getPrefix(), tunType,false, monitorProtocol, monitorInterval, idManagerService, dataBroker, futures, t )) {
 237                                     logger.error("Unable to build tunnel {} -- {}", hwTep.getHwIp(), vtep.getIpAddress());
 238                                 }
 239                                 //CSS-TOR
 240                                 logger.trace("wire up {} and {}", vtep,hwTep);
 241                                 boolean useOfTunnel = ItmUtils.falseIfNull(vtep.isOptionOfTunnel());
 242                                 if(!wireUp(vtep.getDpnId(), vtep.getPortname(), sub.getVlanId(), vtep.getIpAddress(),
 243                                         useOfTunnel, hwTep.getNode_id(),hwTep.getHwIp(),sub.getPrefix(),
 244                                         sub.getGatewayIp(),hwTep.getIpPrefix(), tunType,false,monitorProtocol,
 245                                         monitorInterval, idManagerService, dataBroker, futures, t )) {
 246                                     ;
 247                                 }
 248                             }
 249
 250                         }
 251                     }
 252                 }
 253             }
 254         }
 255     }
 256
 257     //for tunnels from TOR device
 258     private static boolean wireUp(String topo_id, String srcNodeid, IpAddress srcIp, String dstNodeId, IpAddress dstIp, IpPrefix srcSubnet,
 259                                   IpAddress gWIp, IpPrefix dstSubnet, Class<? extends TunnelTypeBase> tunType,Boolean monitorEnabled,  Class<? extends TunnelMonitoringTypeBase> monitorProtocol,
 260                                   Integer monitorInterval,IdManagerService idManagerService, DataBroker dataBroker, List<ListenableFuture<Void>> futures, WriteTransaction t) {
 261         IpAddress gatewayIpObj = new IpAddress("0.0.0.0".toCharArray());
 262         IpAddress gwyIpAddress = srcSubnet.equals(dstSubnet) ? gatewayIpObj : gWIp;
 263         String parentIf =  ItmUtils.getHwParentIf(topo_id, srcNodeid);
 264         String tunTypeStr = tunType.getName();
 265         String tunnelIfName = ItmUtils.getTrunkInterfaceName(idManagerService, parentIf,
 266                 srcIp.getIpv4Address().getValue(), dstIp.getIpv4Address().getValue(), tunTypeStr);
 267         logger.debug(" Creating ExternalTrunk Interface with parameters Name - {}, parent I/f name - {}, source IP - {}, destination IP - {} gateway IP - {}", tunnelIfName, parentIf, srcIp, dstIp, gwyIpAddress);
 268         Interface hwTunnelIf = ItmUtils.buildHwTunnelInterface(tunnelIfName, String.format("%s %s", tunType.getName(), "Trunk Interface"),
 269                 true, topo_id, srcNodeid, tunType, srcIp, dstIp, gwyIpAddress, monitorEnabled, monitorProtocol, monitorInterval);
 270         InstanceIdentifier<Interface> ifIID = InstanceIdentifier.builder(Interfaces.class).child(Interface.class, new InterfaceKey(tunnelIfName)).build();
 271         logger.trace(" Writing Trunk Interface to Config DS {}, {} ", ifIID, hwTunnelIf);
 272         ItmUtils.itmCache.addInterface(hwTunnelIf);
 273         t.merge(LogicalDatastoreType.CONFIGURATION, ifIID, hwTunnelIf, true);
 274         // also update itm-state ds?
 275         InstanceIdentifier<ExternalTunnel> path = InstanceIdentifier.create(
 276                 ExternalTunnelList.class)
 277                 .child(ExternalTunnel.class, new ExternalTunnelKey( getExternalTunnelKey(dstNodeId), getExternalTunnelKey(srcNodeid), tunType));
 278         ExternalTunnel tnl = ItmUtils.buildExternalTunnel(  getExternalTunnelKey(srcNodeid),
 279                 getExternalTunnelKey(dstNodeId),
 280                 tunType, tunnelIfName);
 281         t.merge(LogicalDatastoreType.CONFIGURATION, path, tnl, true);
 282         ItmUtils.itmCache.addExternalTunnel(tnl);
 283         return true;
 284     }
 285
 286     //for tunnels from CSS
 287     private static boolean wireUp(BigInteger dpnId, String portname, Integer vlanId, IpAddress srcIp, Boolean remoteIpFlow, String dstNodeId, IpAddress dstIp, IpPrefix srcSubnet,
 288                                   IpAddress gWIp, IpPrefix dstSubnet, Class<? extends TunnelTypeBase> tunType, Boolean monitorEnabled, Class<? extends TunnelMonitoringTypeBase> monitorProtocol, Integer monitorInterval,
 289                                   IdManagerService idManagerService, DataBroker dataBroker, List<ListenableFuture<Void>> futures, WriteTransaction t) {
 290         IpAddress gatewayIpObj = new IpAddress("0.0.0.0".toCharArray());
 291         IpAddress gwyIpAddress = srcSubnet.equals(dstSubnet) ? gatewayIpObj : gWIp;
 292         String parentIf = ItmUtils.getInterfaceName(dpnId, portname, vlanId);
 293         String tunTypeStr = tunType.getName();
 294         String tunnelIfName = ItmUtils.getTrunkInterfaceName(idManagerService, parentIf,
 295                 srcIp.getIpv4Address().getValue(), dstIp.getIpv4Address().getValue(), tunTypeStr);
 296         logger.debug(" Creating ExternalTrunk Interface with parameters Name - {}, parent I/f name - {}, source IP - {}, destination IP - {} gateway IP - {}", tunnelIfName, parentIf, srcIp, dstIp, gwyIpAddress);
 297         Interface extTunnelIf = ItmUtils.buildTunnelInterface(dpnId, tunnelIfName,
 298                 String.format("%s %s", tunType.getName(), "Trunk Interface"), true, tunType, srcIp, dstIp, gwyIpAddress,
 299                 vlanId, false,monitorEnabled, monitorProtocol, monitorInterval, remoteIpFlow);
 300         InstanceIdentifier<Interface> ifIID = InstanceIdentifier.builder(Interfaces.class).child(Interface.class, new InterfaceKey(tunnelIfName)).build();
 301         logger.trace(" Writing Trunk Interface to Config DS {}, {} ", ifIID, extTunnelIf);
 302         t.merge(LogicalDatastoreType.CONFIGURATION, ifIID, extTunnelIf, true);
 303         ItmUtils.itmCache.addInterface(extTunnelIf);
 304         InstanceIdentifier<ExternalTunnel> path = InstanceIdentifier.create(
 305                 ExternalTunnelList.class)
 306                 .child(ExternalTunnel.class, new ExternalTunnelKey(getExternalTunnelKey(dstNodeId), dpnId.toString(), tunType));
 307         ExternalTunnel tnl = ItmUtils.buildExternalTunnel(  dpnId.toString(),
 308                 getExternalTunnelKey(dstNodeId),
 309                 tunType, tunnelIfName);
 310         t.merge(LogicalDatastoreType.CONFIGURATION, path, tnl, true);
 311         ItmUtils.itmCache.addExternalTunnel(tnl);
 312         return true;
 313     }
 314
 315     static String getExternalTunnelKey(String nodeid) {
 316         if (nodeid.indexOf("physicalswitch") > 0) {
 317             nodeid = nodeid.substring(0, nodeid.indexOf("physicalswitch") - 1);
 318         }
 319         return nodeid;
 320     }
 321
 322 }
 323