vpnmanager/impl/src/main/java/org/opendaylight/netvirt/vpnmanager/intervpnlink/IVpnLinkServiceImpl.java

   1 /*
   2  * Copyright (c) 2017 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.netvirt.vpnmanager.intervpnlink;
   9
  10 import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
  11
  12 import com.google.common.base.Optional;
  13 import com.google.common.base.Preconditions;
  14 import java.util.ArrayList;
  15 import java.util.Collections;
  16 import java.util.HashMap;
  17 import java.util.List;
  18 import java.util.Map;
  19 import java.util.Objects;
  20 import java.util.stream.Collectors;
  21 import javax.annotation.PostConstruct;
  22 import javax.annotation.PreDestroy;
  23 import javax.inject.Inject;
  24 import javax.inject.Singleton;
  25 import org.eclipse.jdt.annotation.Nullable;
  26 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  27 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  28 import org.opendaylight.genius.infra.ManagedNewTransactionRunner;
  29 import org.opendaylight.genius.infra.ManagedNewTransactionRunnerImpl;
  30 import org.opendaylight.genius.mdsalutil.MDSALUtil;
  31 import org.opendaylight.genius.mdsalutil.NwConstants;
  32 import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
  33 import org.opendaylight.netvirt.bgpmanager.api.IBgpManager;
  34 import org.opendaylight.netvirt.fibmanager.api.FibHelper;
  35 import org.opendaylight.netvirt.fibmanager.api.IFibManager;
  36 import org.opendaylight.netvirt.fibmanager.api.RouteOrigin;
  37 import org.opendaylight.netvirt.neutronvpn.api.utils.NeutronUtils;
  38 import org.opendaylight.netvirt.vpnmanager.VpnConstants;
  39 import org.opendaylight.netvirt.vpnmanager.VpnUtil;
  40 import org.opendaylight.netvirt.vpnmanager.api.InterfaceUtils;
  41 import org.opendaylight.netvirt.vpnmanager.api.intervpnlink.IVpnLinkService;
  42 import org.opendaylight.netvirt.vpnmanager.api.intervpnlink.InterVpnLinkCache;
  43 import org.opendaylight.netvirt.vpnmanager.api.intervpnlink.InterVpnLinkDataComposite;
  44 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  45 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.IdManagerService;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.FibEntries;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.fibentries.VrfTables;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.fibentries.VrfTablesKey;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.vrfentries.VrfEntry;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.vrfentries.VrfEntryBuilder;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.vrfentries.VrfEntryKey;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.VpnMaps;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.vpnmaps.VpnMap;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.l3.attributes.Routes;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.Routers;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.routers.Router;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.rev150712.Neutron;
  59 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  60 import org.opendaylight.yangtools.yang.common.Uint32;
  61 import org.opendaylight.yangtools.yang.common.Uint64;
  62 import org.slf4j.Logger;
  63 import org.slf4j.LoggerFactory;
  64
  65 @Singleton
  66 public class IVpnLinkServiceImpl implements IVpnLinkService, AutoCloseable {
  67
  68     private static final Logger LOG = LoggerFactory.getLogger(IVpnLinkServiceImpl.class);
  69
  70     private final DataBroker dataBroker;
  71     private final ManagedNewTransactionRunner txRunner;
  72     private final IdManagerService idManager;
  73     private final IBgpManager bgpManager;
  74     private final IFibManager fibManager;
  75     private final InterVpnLinkCache interVpnLinkCache;
  76     private final VpnUtil vpnUtil;
  77     private final InterVpnLinkUtil interVpnLinkUtil;
  78
  79     @Inject
  80     public IVpnLinkServiceImpl(final DataBroker dataBroker, final IdManagerService idMgr, final IBgpManager bgpMgr,
  81                                final IFibManager fibMgr, final InterVpnLinkCache interVpnLinkCache,
  82                                VpnUtil vpnUtil, InterVpnLinkUtil interVpnLinkUtil) {
  83         this.dataBroker = dataBroker;
  84         this.txRunner = new ManagedNewTransactionRunnerImpl(dataBroker);
  85         this.idManager = idMgr;
  86         this.bgpManager = bgpMgr;
  87         this.fibManager = fibMgr;
  88         this.interVpnLinkCache = interVpnLinkCache;
  89         this.vpnUtil = vpnUtil;
  90         this.interVpnLinkUtil = interVpnLinkUtil;
  91     }
  92
  93     @PostConstruct
  94     public void start() {
  95         LOG.info("{} start", getClass().getSimpleName());
  96     }
  97
  98     @Override
  99     @PreDestroy
 100     public void close() {
 101     }
 102
 103     @Override
 104     public void leakRoute(String vpnName, String prefix, List<String> nextHopList, Uint32 label, int addOrRemove) {
 105         LOG.trace("leakRoute: vpnName={}  prefix={}  nhList={}  label={}", vpnName, prefix, nextHopList, label);
 106         Optional<InterVpnLinkDataComposite> optIVpnLink = interVpnLinkCache.getInterVpnLinkByVpnId(vpnName);
 107         if (!optIVpnLink.isPresent()) {
 108             LOG.debug("Vpn {} not involved in any InterVpnLink", vpnName);
 109             return;
 110         }
 111         leakRoute(optIVpnLink.get(), vpnName, prefix, nextHopList, label, addOrRemove);
 112     }
 113
 114     // TODO Clean up the exception handling
 115     @SuppressWarnings("checkstyle:IllegalCatch")
 116     private void leakRoute(InterVpnLinkDataComposite interVpnLink, String vpnName, String prefix,
 117                            List<String> nextHopList, Uint32 label, int addOrRemove) {
 118
 119         String dstVpnName = interVpnLink.getOtherVpnName(vpnName);
 120
 121         LOG.trace("leakingRoute: from VPN={} to VPN={}: prefix={}  nhList={}  label={}",
 122                   vpnName, dstVpnName, prefix, nextHopList, label);
 123
 124         // For leaking, we need the InterVpnLink to be active.
 125         if (addOrRemove == NwConstants.ADD_FLOW && !interVpnLink.isActive()) {
 126             LOG.warn("Cannot leak route [prefix={}, label={}] from VPN {} to VPN {} because "
 127                      + "InterVpnLink {} is not active",
 128                      prefix, label, vpnName, dstVpnName, interVpnLink.getInterVpnLinkName());
 129             return;
 130         }
 131
 132         String dstVpnRd = vpnUtil.getVpnRd(dstVpnName);
 133         if (addOrRemove == NwConstants.ADD_FLOW) {
 134             LOG.debug("Leaking route (prefix={}, nexthop={}) from Vpn={} to Vpn={} (RD={})",
 135                       prefix, nextHopList, vpnName, dstVpnName, dstVpnRd);
 136             String key = dstVpnRd + VpnConstants.SEPARATOR + prefix;
 137             Uint32 leakedLabel = vpnUtil.getUniqueId(VpnConstants.VPN_IDPOOL_NAME, key);
 138             String leakedNexthop = interVpnLink.getEndpointIpAddr(vpnName);
 139             fibManager.addOrUpdateFibEntry(dstVpnRd, null /*macAddress*/, prefix,
 140                                            Collections.singletonList(leakedNexthop), VrfEntry.EncapType.Mplsgre,
 141                                            leakedLabel, Uint32.ZERO /*l3vni*/, null /*gatewayMacAddress*/,
 142                                            null /*parentVpnRd*/, RouteOrigin.INTERVPN, null /*writeConfigTxn*/);
 143
 144             List<String> ivlNexthops =
 145                 interVpnLink.getEndpointDpnsByVpnName(dstVpnName).stream()
 146                             .map(dpnId -> InterfaceUtils.getEndpointIpAddressForDPN(dataBroker, dpnId))
 147                             .collect(Collectors.toList());
 148             try {
 149                 bgpManager.advertisePrefix(dstVpnRd, null /*macAddress*/, prefix, ivlNexthops,
 150                                            VrfEntry.EncapType.Mplsgre, leakedLabel, Uint32.ZERO /*l3vni*/,
 151                                            Uint32.ZERO /*l2vni*/, null /*gwMacAddress*/);
 152             } catch (Exception e) {
 153                 LOG.error("Exception while advertising prefix {} on vpnRd {} for intervpn link", prefix, dstVpnRd, e);
 154             }
 155         } else {
 156             LOG.debug("Removing leaked route to {} from VPN {}", prefix, dstVpnName);
 157             fibManager.removeFibEntry(dstVpnRd, prefix, null, null /*writeConfigTxn*/);
 158             bgpManager.withdrawPrefix(dstVpnRd, prefix);
 159         }
 160     }
 161
 162     // TODO Clean up the exception handling
 163     @SuppressWarnings("checkstyle:IllegalCatch")
 164     @Override
 165     public void leakRoute(InterVpnLinkDataComposite interVpnLink, String srcVpnUuid, String dstVpnUuid,
 166                           String prefix, Uint32 label, @Nullable RouteOrigin forcedOrigin) {
 167         String ivpnLinkName = interVpnLink.getInterVpnLinkName();
 168         // The source VPN must participate in the InterVpnLink
 169         Preconditions.checkArgument(interVpnLink.isVpnLinked(srcVpnUuid),
 170                                     "The source VPN {} does not participate in the interVpnLink {}",
 171                                     srcVpnUuid, ivpnLinkName);
 172         // The destination VPN must participate in the InterVpnLink
 173         Preconditions.checkArgument(interVpnLink.isVpnLinked(dstVpnUuid),
 174                                     "The destination VPN {} does not participate in the interVpnLink {}",
 175                                     dstVpnUuid, ivpnLinkName);
 176
 177         String endpointIp = interVpnLink.getOtherEndpointIpAddr(dstVpnUuid);
 178         String leakedOrigin = forcedOrigin != null ? forcedOrigin.getValue() : RouteOrigin.INTERVPN.getValue();
 179         FibHelper.buildRoutePath(endpointIp, label);
 180         VrfEntry newVrfEntry =
 181             new VrfEntryBuilder().withKey(new VrfEntryKey(prefix)).setDestPrefix(prefix)
 182                                  .setRoutePaths(
 183                                      Collections.singletonList(FibHelper.buildRoutePath(endpointIp, label)))
 184                                  .setOrigin(leakedOrigin).build();
 185
 186         String dstVpnRd = vpnUtil.getVpnRd(dstVpnUuid);
 187         InstanceIdentifier<VrfEntry> newVrfEntryIid =
 188             InstanceIdentifier.builder(FibEntries.class)
 189                               .child(VrfTables.class, new VrfTablesKey(dstVpnRd))
 190                               .child(VrfEntry.class, new VrfEntryKey(newVrfEntry.getDestPrefix()))
 191                               .build();
 192         ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, tx ->
 193             tx.put(newVrfEntryIid, newVrfEntry)), LOG, "Error adding VRF entry {}", newVrfEntry);
 194
 195         // Finally, route is advertised it to the DC-GW. But while in the FibEntries the nexthop is the other
 196         // endpoint's IP, in the DC-GW the nexthop for those prefixes are the IPs of those DPNs where the target
 197         // VPN has been instantiated
 198         List<Uint64> srcDpnList = interVpnLink.getEndpointDpnsByVpnName(srcVpnUuid);
 199         List<String> nexthops =
 200             srcDpnList.stream().map(dpnId -> InterfaceUtils.getEndpointIpAddressForDPN(dataBroker, dpnId))
 201                                .collect(Collectors.toList());
 202
 203         LOG.debug("Advertising route in VPN={} [prefix={} label={}  nexthops={}] to DC-GW",
 204                   dstVpnRd, newVrfEntry.getDestPrefix(), label.intValue(), nexthops);
 205         try {
 206             bgpManager.advertisePrefix(dstVpnRd, null /*macAddress*/, prefix, nexthops,
 207                                        VrfEntry.EncapType.Mplsgre, label, Uint32.ZERO /*l3vni*/, Uint32.ZERO /*l2vni*/,
 208                                        null /*gwMacAddress*/);
 209         } catch (Exception e) {
 210             LOG.error("Exception while advertising prefix {} on vpnRd {} for intervpn link", prefix, dstVpnRd, e);
 211         }
 212     }
 213
 214     @Override
 215     public void leakRouteIfNeeded(String vpnName, String prefix, List<String> nextHopList, Uint32 label,
 216                                   RouteOrigin origin, int addOrRemove) {
 217
 218         Optional<InterVpnLinkDataComposite> optIVpnLink = interVpnLinkCache.getInterVpnLinkByVpnId(vpnName);
 219         if (!optIVpnLink.isPresent()) {
 220             LOG.debug("Vpn {} not involved in any InterVpnLink", vpnName);
 221             return;
 222         }
 223         InterVpnLinkDataComposite ivpnLink = optIVpnLink.get();
 224         if (addOrRemove == NwConstants.ADD_FLOW && !ivpnLink.isActive()) {
 225             // Note: for the removal case it is not necessary that ivpnlink is ACTIVE
 226             LOG.debug("Route to {} in VPN {} cannot be leaked because InterVpnLink {} is not ACTIVE",
 227                       prefix, vpnName, ivpnLink.getInterVpnLinkName());
 228             return;
 229         }
 230
 231         switch (origin) {
 232             case BGP:
 233                 if (!ivpnLink.isBgpRoutesLeaking()) {
 234                     LOG.debug("BGP route to {} not leaked because bgp-routes-leaking is disabled", prefix);
 235                     return;
 236                 }
 237                 leakRoute(vpnName, prefix, nextHopList, label, addOrRemove);
 238                 break;
 239             case STATIC:
 240                 /* NOTE: There are 2 types of static routes depending on the next hop:
 241                     + static route when next hop is a VM, the DC-GW or a DPNIP
 242                     + static route when next hop is an Inter-VPN Link
 243                  Only the 1st type should be considered since the 2nd has a special treatment */
 244                 if (!ivpnLink.isStaticRoutesLeaking()) {
 245                     LOG.debug("Static route to {} not leaked because static-routes-leaking is disabled", prefix);
 246                     return;
 247                 }
 248                 leakRoute(vpnName, prefix, nextHopList, label, addOrRemove);
 249                 break;
 250             case CONNECTED:
 251                 if (!ivpnLink.isConnectedRoutesLeaking()) {
 252                     LOG.debug("Connected route to {} not leaked because connected-routes-leaking is disabled", prefix);
 253                     return;
 254                 }
 255                 leakRoute(vpnName, prefix, nextHopList, label, addOrRemove);
 256                 break;
 257             default:
 258                 LOG.warn("origin {} not considered in Route-leaking", origin.getValue());
 259         }
 260
 261     }
 262
 263     @Override
 264     public void exchangeRoutes(InterVpnLinkDataComposite ivpnLink) {
 265         if (!ivpnLink.isComplete()) {
 266             return;
 267         }
 268
 269         // The type of routes to exchange depend on the leaking flags that have been activated
 270         List<RouteOrigin> originsToConsider = new ArrayList<>();
 271         if (ivpnLink.isBgpRoutesLeaking()) {
 272             originsToConsider.add(RouteOrigin.BGP);
 273         }
 274         if (ivpnLink.isStaticRoutesLeaking()) {
 275             originsToConsider.add(RouteOrigin.STATIC);
 276         }
 277         if (ivpnLink.isConnectedRoutesLeaking()) {
 278             originsToConsider.add(RouteOrigin.CONNECTED);
 279         }
 280
 281         String vpn1Uuid = ivpnLink.getFirstEndpointVpnUuid().get();
 282         String vpn2Uuid = ivpnLink.getSecondEndpointVpnUuid().get();
 283
 284         if (! originsToConsider.isEmpty()) {
 285             // 1st Endpoint ==> 2nd endpoint
 286             leakRoutes(ivpnLink, vpn1Uuid, vpn2Uuid, originsToConsider);
 287
 288
 289             // 2nd Endpoint ==> 1st endpoint
 290             leakRoutes(ivpnLink, vpn2Uuid, vpn1Uuid, originsToConsider);
 291         }
 292
 293         // Static routes in Vpn1 pointing to Vpn2's endpoint
 294         leakExtraRoutesToVpnEndpoint(ivpnLink, vpn1Uuid, vpn2Uuid);
 295
 296         // Static routes in Vpn2 pointing to Vpn1's endpoint
 297         leakExtraRoutesToVpnEndpoint(ivpnLink, vpn2Uuid, vpn1Uuid);
 298     }
 299
 300     /*
 301      * Checks if there are static routes in Vpn1 whose nexthop is Vpn2's endpoint.
 302      * Those routes must be leaked to Vpn1.
 303      *
 304      * @param vpnLink
 305      * @param vpn1Uuid
 306      * @param vpn2Uuid
 307      */
 308     private void leakExtraRoutesToVpnEndpoint(InterVpnLinkDataComposite vpnLink, String vpn1Uuid, String vpn2Uuid) {
 309
 310         String vpn1Rd = vpnUtil.getVpnRd(vpn1Uuid);
 311         String vpn2Endpoint = vpnLink.getOtherEndpointIpAddr(vpn2Uuid);
 312         List<VrfEntry> allVpnVrfEntries = vpnUtil.getAllVrfEntries(vpn1Rd);
 313         for (VrfEntry vrfEntry : allVpnVrfEntries) {
 314             vrfEntry.nonnullRoutePaths().stream()
 315                     .filter(routePath -> Objects.equals(routePath.getNexthopAddress(), vpn2Endpoint))
 316                     .forEach(routePath -> {
 317                         // Vpn1 has a route pointing to Vpn2's endpoint. Forcing the leaking of the route will update
 318                         // the BGP accordingly
 319                         Uint32 label = vpnUtil.getUniqueId(VpnConstants.VPN_IDPOOL_NAME,
 320                                                          VpnUtil.getNextHopLabelKey(vpn1Rd, vrfEntry.getDestPrefix()));
 321                         if (label.longValue() == VpnConstants.INVALID_LABEL) {
 322                             LOG.error("Unable to fetch label from Id Manager. Bailing out of leaking extra routes for "
 323                                       + "InterVpnLink {} rd {} prefix {}",
 324                                       vpnLink.getInterVpnLinkName(), vpn1Rd, vrfEntry.getDestPrefix());
 325                         } else {
 326                             leakRoute(vpnLink, vpn2Uuid, vpn1Uuid, vrfEntry.getDestPrefix(), label,
 327                                       RouteOrigin.value(vrfEntry.getOrigin()));
 328                         }
 329                     });
 330
 331         }
 332     }
 333
 334     private void leakRoutes(InterVpnLinkDataComposite vpnLink, String srcVpnUuid, String dstVpnUuid,
 335                             List<RouteOrigin> originsToConsider) {
 336         String srcVpnRd = vpnUtil.getVpnRd(srcVpnUuid);
 337         String dstVpnRd = vpnUtil.getVpnRd(dstVpnUuid);
 338         List<VrfEntry> srcVpnRemoteVrfEntries = vpnUtil.getVrfEntriesByOrigin(srcVpnRd, originsToConsider);
 339         for (VrfEntry vrfEntry : srcVpnRemoteVrfEntries) {
 340             Uint32 label = vpnUtil.getUniqueId(VpnConstants.VPN_IDPOOL_NAME,
 341                                              VpnUtil.getNextHopLabelKey(dstVpnRd, vrfEntry.getDestPrefix()));
 342             if (label.longValue() == VpnConstants.INVALID_LABEL) {
 343                 LOG.error("Unable to fetch label from Id Manager. Bailing out of leaking routes for InterVpnLink {} "
 344                           + "rd {} prefix {}",
 345                         vpnLink.getInterVpnLinkName(), dstVpnRd, vrfEntry.getDestPrefix());
 346                 continue;
 347             }
 348             leakRoute(vpnLink, srcVpnUuid, dstVpnUuid, vrfEntry.getDestPrefix(), label, null /*NotForcedOrigin*/);
 349         }
 350     }
 351
 352     private Map<String, String> buildRouterXL3VPNMap() {
 353         InstanceIdentifier<VpnMaps> vpnMapsIdentifier = InstanceIdentifier.builder(VpnMaps.class).build();
 354         Optional<VpnMaps> optVpnMaps =
 355             MDSALUtil.read(dataBroker, LogicalDatastoreType.CONFIGURATION, vpnMapsIdentifier);
 356         if (!optVpnMaps.isPresent()) {
 357             LOG.info("Could not retrieve VpnMaps object from Configurational DS");
 358             return new HashMap<>();
 359         }
 360         Map<String,String> vmap = new HashMap<>();
 361         final List<VpnMap> VpnMapList = optVpnMaps.get().nonnullVpnMap();
 362         for (VpnMap map : VpnMapList) {
 363             if (map.getRouterIds() == null) {
 364                 continue;
 365             }
 366             final List<Uuid> vpnRouterIds = NeutronUtils.getVpnMapRouterIdsListUuid(map.getRouterIds());
 367             for (Uuid routerId : vpnRouterIds) {
 368                 if (map.getVpnId().getValue().equalsIgnoreCase(routerId.getValue())) {
 369                     break; // VPN is internal
 370                 }
 371                 vmap.put(routerId.getValue(), map.getVpnId().getValue());
 372             }
 373         }
 374         return vmap;
 375     }
 376
 377
 378     @Override
 379     public void handleStaticRoutes(InterVpnLinkDataComposite ivpnLink) {
 380         /*
 381          * Checks if there are any static routes pointing to any of both
 382          * InterVpnLink's endpoints. Goes through all routers checking if they have
 383          * a route whose nexthop is an InterVpnLink endpoint
 384          */
 385
 386         // Map that corresponds a routerId with the L3VPN that it's been assigned to.
 387         Map<String, String> routerXL3VpnMap = buildRouterXL3VPNMap();
 388
 389         // Retrieving all Routers
 390         InstanceIdentifier<Routers> routersIid = InstanceIdentifier.builder(Neutron.class)
 391                 .child(Routers.class).build();
 392         Optional<Routers> routerOpData = MDSALUtil.read(dataBroker, LogicalDatastoreType.CONFIGURATION, routersIid);
 393         if (!routerOpData.isPresent()) {
 394
 395             return;
 396         }
 397         List<Router> routers = routerOpData.get().nonnullRouter();
 398         for (Router router : routers) {
 399             String vpnId = routerXL3VpnMap.get(router.getUuid().getValue());
 400             if (vpnId == null) {
 401                 LOG.warn("Could not find suitable VPN for router {}", router.getUuid());
 402                 continue; // with next router
 403             }
 404             List<Routes> routerRoutes = router.getRoutes();
 405             if (routerRoutes != null) {
 406                 for (Routes route : routerRoutes) {
 407                     handleStaticRoute(vpnId, route, ivpnLink);
 408                 }
 409             }
 410         }
 411     }
 412
 413     /*
 414      * Takes care of an static route to see if flows related to interVpnLink
 415      * must be installed in tables 20 and 17
 416      *
 417      * @param vpnId Vpn to which the route belongs
 418      * @param route Route to handle. Will only be considered if its nexthop is the VPN's endpoint IpAddress
 419      *              at the other side of the InterVpnLink
 420      * @param iVpnLink
 421      */
 422     @SuppressWarnings("checkstyle:IllegalCatch")
 423     private void handleStaticRoute(String vpnId, Routes route, InterVpnLinkDataComposite ivpnLink) {
 424
 425         IpAddress nhIpAddr = route.getNexthop();
 426         String routeNextHop = nhIpAddr.getIpv4Address() != null ? nhIpAddr.getIpv4Address().getValue()
 427                                                                   : nhIpAddr.getIpv6Address().getValue();
 428         String destination = route.getDestination().stringValue();
 429
 430         // is nexthop the other endpoint's IP
 431         String otherEndpoint = ivpnLink.getOtherEndpoint(vpnId);
 432         if (!routeNextHop.equals(otherEndpoint)) {
 433             LOG.debug("VPN {}: Route to {} nexthop={} points to an InterVpnLink endpoint, but its not "
 434                       + "the other endpoint. Other endpoint is {}",
 435                       vpnId, destination, routeNextHop, otherEndpoint);
 436             return;
 437         }
 438
 439         // Lets work: 1) write Fibentry, 2) advertise to BGP and 3) check if it must be leaked
 440         String vpnRd = vpnUtil.getVpnRd(vpnId);
 441         if (vpnRd == null) {
 442             LOG.warn("Could not find Route-Distinguisher for VpnName {}", vpnId);
 443             return;
 444         }
 445
 446         Uint32 label = vpnUtil.getUniqueId(VpnConstants.VPN_IDPOOL_NAME,
 447                                 VpnUtil.getNextHopLabelKey(vpnId, destination));
 448
 449         try {
 450             interVpnLinkUtil.handleStaticRoute(ivpnLink, vpnId, destination, routeNextHop, label);
 451         } catch (Exception e) {
 452             LOG.error("Exception while advertising prefix for intervpn link", e);
 453         }
 454     }
 455 }