Examples with ProviderTypes org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes used on opensource projects

Example 6 with ProviderTypes

use of org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes in project netvirt by opendaylight.

the class NatTunnelInterfaceStateListener method hndlTepAddForAllRtrs.

private boolean hndlTepAddForAllRtrs(BigInteger srcDpnId, String tunnelType, String tunnelName, String srcTepIp, String destTepIp, WriteTransaction writeFlowInvTx) {
    LOG.trace("hndlTepAddForAllRtrs: TEP ADD ----- for EXTERNAL/HWVTEP ITM Tunnel, TYPE {} ,State is UP b/w SRC IP" + " : {} and DEST IP: {}", fibManager.getTransportTypeStr(tunnelType), srcTepIp, destTepIp);
    InstanceIdentifier<DpnRoutersList> dpnRoutersListId = NatUtil.getDpnRoutersId(srcDpnId);
    Optional<DpnRoutersList> optionalRouterDpnList = SingleTransactionDataBroker.syncReadOptionalAndTreatReadFailedExceptionAsAbsentOptional(dataBroker, LogicalDatastoreType.OPERATIONAL, dpnRoutersListId);
    if (!optionalRouterDpnList.isPresent()) {
        LOG.info("hndlTepAddForAllRtrs : RouterDpnList model is empty for DPN {}. Hence ignoring TEP add event " + "for the ITM TUNNEL TYPE {} b/w SRC IP {} and DST IP {} and TUNNEL NAME {} ", srcDpnId, tunnelType, srcTepIp, destTepIp, tunnelName);
        return false;
    }
    List<RoutersList> routersList = optionalRouterDpnList.get().getRoutersList();
    if (routersList == null) {
        LOG.debug("hndlTepAddForAllRtrs : Ignoring TEP add for the DPN {} since no routers are associated" + " for the DPN having the TUNNEL TYPE {} b/w SRC IP {} and DST IP {} and" + "TUNNEL NAME {} ", srcDpnId, tunnelType, srcTepIp, destTepIp, tunnelName);
        return false;
    }
    String nextHopIp = NatUtil.getEndpointIpAddressForDPN(dataBroker, srcDpnId);
    for (RoutersList router : routersList) {
        String routerName = router.getRouter();
        long routerId = NatUtil.getVpnId(dataBroker, routerName);
        if (routerId == NatConstants.INVALID_ID) {
            LOG.error("hndlTepAddForAllRtrs :Invalid ROUTER-ID {} returned for routerName {}", routerId, routerName);
            return false;
        }
        LOG.debug("hndlTepAddForAllRtrs : TEP ADD : DNAT -> Advertising routes for router {} ", routerName);
        Uuid externalNetworkId = NatUtil.getNetworkIdFromRouterName(dataBroker, routerName);
        ProviderTypes extNwProvType = NatEvpnUtil.getExtNwProvTypeFromRouterName(dataBroker, routerName, externalNetworkId);
        if (extNwProvType == null) {
            return false;
        }
        hndlTepAddForDnatInEachRtr(router, routerId, nextHopIp, srcDpnId, extNwProvType, writeFlowInvTx);
        LOG.debug("hndlTepAddForAllRtrs : TEP ADD : SNAT -> Advertising routes for router {} ", routerName);
        hndlTepAddForSnatInEachRtr(router, routerId, srcDpnId, tunnelType, srcTepIp, destTepIp, tunnelName, nextHopIp, extNwProvType, writeFlowInvTx);
    }
    return true;
}

Example 7 with ProviderTypes

use of org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes in project netvirt by opendaylight.

the class NatTunnelInterfaceStateListener method hndlTepAddOnNaptSwitch.

private boolean hndlTepAddOnNaptSwitch(BigInteger srcDpnId, String tunnelType, String srcTepIp, String destTepIp, String tunnelName, long routerId, Optional<Routers> routerData, String nextHopIp, Uuid vpnName, ProviderTypes extNwProvType, WriteTransaction writeFlowInvTx) {
    if (!routerData.isPresent()) {
        LOG.warn("hndlTepAddOnNaptSwitch: routerData is not present");
        return false;
    }
    Routers router = routerData.get();
    String routerName = router.getRouterName();
    LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Processing TEP add for the DPN {} having the router {} since " + "its THE NAPT switch for the TUNNEL TYPE {} b/w SRC IP {} and DST IP {} " + "and TUNNEL NAME {} ", srcDpnId, routerName, tunnelType, srcTepIp, destTepIp, tunnelName);
    Uuid networkId = router.getNetworkId();
    if (networkId == null) {
        LOG.warn("hndlTepAddOnNaptSwitch : SNAT -> Ignoring TEP add since the router {} is not associated to the " + "external network", routerName);
        return false;
    }
    LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Router {} is associated with Ext nw {}", routerId, networkId);
    Long vpnId;
    if (vpnName == null) {
        LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Internal VPN associated to router {}", routerId);
        vpnId = NatUtil.getNetworkVpnIdFromRouterId(dataBroker, routerId);
        if (vpnId == NatConstants.INVALID_ID) {
            LOG.error("hndlTepAddOnNaptSwitch : Invalid External VPN-ID returned for routerName {}", routerName);
            return false;
        }
        LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Retrieved External VPN-ID {} for router {}", vpnId, routerId);
    } else {
        LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Private BGP VPN associated to router {}", routerId);
        vpnId = NatUtil.getVpnId(dataBroker, vpnName.getValue());
        if (vpnId == null || vpnId == NatConstants.INVALID_ID) {
            LOG.error("hndlTepAddOnNaptSwitch : Invalid vpnId returned for routerName {}", routerName);
            return false;
        }
        LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Retrieved vpnId {} for router {}", vpnId, routerId);
    }
    /*1) Withdraw the old route to the external IP from the BGP which was having the
             next hop as the old TEP IP.
          2) Advertise to the BGP about the new route to the external IP having the
          new TEP IP as the next hop.
          3) Populate a new FIB entry with the next hop IP as the new TEP IP using the
          FIB manager.
        */
    // Withdraw the old route to the external IP from the BGP which was having the
    // next hop as the old TEP IP.
    final String externalVpnName = NatUtil.getAssociatedVPN(dataBroker, networkId);
    if (externalVpnName == null) {
        LOG.error("hndlTepAddOnNaptSwitch :  SNAT -> No VPN associated with ext nw {} in router {}", networkId, routerId);
        return false;
    }
    Collection<String> externalIps = NatUtil.getExternalIpsForRouter(dataBroker, routerId);
    LOG.debug("hndlTepAddOnNaptSwitch : Clearing the FIB entries but not the BGP routes");
    for (String externalIp : externalIps) {
        String rd = NatUtil.getVpnRd(dataBroker, externalVpnName);
        LOG.debug("hndlTepAddOnNaptSwitch : Removing Fib entry rd {} prefix {}", rd, externalIp);
        fibManager.removeFibEntry(rd, externalIp, null);
    }
    /*
        Advertise to the BGP about the new route to the external IP having the
        new TEP IP as the next hop.
        Populate a new FIB entry with the next hop IP as the new TEP IP using the
        FIB manager.
        */
    String rd = NatUtil.getVpnRd(dataBroker, externalVpnName);
    if (extNwProvType == null) {
        return false;
    }
    String gwMacAddress = null;
    long l3Vni = 0;
    if (extNwProvType == ProviderTypes.VXLAN) {
        // Get the External Gateway MAC Address which is Router gateway MAC address for SNAT
        gwMacAddress = NatUtil.getExtGwMacAddFromRouterName(dataBroker, routerName);
        if (gwMacAddress != null) {
            LOG.debug("hndlTepAddOnNaptSwitch : External Gateway MAC address {} found for External Router ID {}", gwMacAddress, routerId);
        } else {
            LOG.error("hndlTepAddOnNaptSwitch : No External Gateway MAC address found for External Router ID {}", routerId);
            return false;
        }
        // get l3Vni value for external VPN
        l3Vni = NatEvpnUtil.getL3Vni(dataBroker, rd);
        if (l3Vni == NatConstants.DEFAULT_L3VNI_VALUE) {
            LOG.debug("hndlTepAddOnNaptSwitch : L3VNI value is not configured in Internet VPN {} and RD {} " + "Carve-out L3VNI value from OpenDaylight VXLAN VNI Pool and continue to installing " + "NAT flows", vpnName, rd);
            l3Vni = NatOverVxlanUtil.getInternetVpnVni(idManager, externalVpnName, routerId).longValue();
        }
    }
    for (final String externalIp : externalIps) {
        long serviceId = 0;
        String fibExternalIp = NatUtil.validateAndAddNetworkMask(externalIp);
        if (extNwProvType == ProviderTypes.VXLAN) {
            LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Advertise the route to the externalIp {} " + "having nextHopIp {}", externalIp, nextHopIp);
            NatEvpnUtil.addRoutesForVxLanProvType(dataBroker, bgpManager, fibManager, externalVpnName, rd, externalIp, nextHopIp, l3Vni, tunnelName, gwMacAddress, writeFlowInvTx, RouteOrigin.STATIC, srcDpnId);
            serviceId = l3Vni;
        } else {
            Long label = externalRouterListner.checkExternalIpLabel(routerId, externalIp);
            if (label == null || label == NatConstants.INVALID_ID) {
                LOG.error("hndlTepAddOnNaptSwitch : SNAT->Unable to advertise to the DC GW " + "since label is invalid");
                return false;
            }
            LOG.debug("hndlTepAddOnNaptSwitch : SNAT -> Advertise the route to the externalIp {} " + "having nextHopIp {}", externalIp, nextHopIp);
            long l3vni = 0;
            if (NatUtil.isOpenStackVniSemanticsEnforcedForGreAndVxlan(elanManager, extNwProvType)) {
                l3vni = NatOverVxlanUtil.getInternetVpnVni(idManager, externalVpnName, l3vni).longValue();
            }
            Uuid externalSubnetId = NatUtil.getExternalSubnetForRouterExternalIp(externalIp, router);
            NatUtil.addPrefixToBGP(dataBroker, bgpManager, fibManager, externalVpnName, rd, externalSubnetId, fibExternalIp, nextHopIp, networkId.getValue(), null, /* mac-address */
            label, l3vni, RouteOrigin.STATIC, srcDpnId);
            serviceId = label;
        }
        LOG.debug("hndlTepAddOnNaptSwitch: SNAT -> Install custom FIB routes " + "(Table 21 -> Push MPLS label to Tunnel port");
        List<Instruction> customInstructions = new ArrayList<>();
        int customInstructionIndex = 0;
        long externalSubnetVpnId = NatUtil.getExternalSubnetVpnIdForRouterExternalIp(dataBroker, externalIp, router);
        if (externalSubnetVpnId != NatConstants.INVALID_ID) {
            LOG.debug("hndlTepAddOnNaptSwitch : Will install custom FIB router with external subnet VPN ID {}", externalSubnetVpnId);
            BigInteger subnetIdMetaData = MetaDataUtil.getVpnIdMetadata(externalSubnetVpnId);
            customInstructions.add(new InstructionWriteMetadata(subnetIdMetaData, MetaDataUtil.METADATA_MASK_VRFID).buildInstruction(customInstructionIndex));
            customInstructionIndex++;
        }
        customInstructions.add(new InstructionGotoTable(NwConstants.INBOUND_NAPT_TABLE).buildInstruction(customInstructionIndex));
        CreateFibEntryInput input = new CreateFibEntryInputBuilder().setVpnName(externalVpnName).setSourceDpid(srcDpnId).setInstruction(customInstructions).setIpAddress(fibExternalIp).setServiceId(serviceId).setInstruction(customInstructions).build();
        Future<RpcResult<Void>> future = fibRpcService.createFibEntry(input);
        ListenableFuture<RpcResult<Void>> listenableFuture = JdkFutureAdapters.listenInPoolThread(future);
        Futures.addCallback(listenableFuture, new FutureCallback<RpcResult<Void>>() {

            @Override
            public void onFailure(@Nonnull Throwable error) {
                LOG.error("hndlTepAddOnNaptSwitch : SNAT->Error in generate label or fib install process", error);
            }

            @Override
            public void onSuccess(@Nonnull RpcResult<Void> result) {
                if (result.isSuccessful()) {
                    LOG.info("hndlTepAddOnNaptSwitch : SNAT -> Successfully installed custom FIB routes " + "for prefix {}", externalIp);
                } else {
                    LOG.error("hndlTepAddOnNaptSwitch : SNAT -> Error in rpc call to create custom Fib entries " + "for prefix {} in DPN {}, {}", externalIp, srcDpnId, result.getErrors());
                }
            }
        }, MoreExecutors.directExecutor());
    }
    return true;
}

Example 8 with ProviderTypes

use of org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes in project netvirt by opendaylight.

the class RouterDpnChangeListener method add.

@Override
protected void add(final InstanceIdentifier<DpnVpninterfacesList> identifier, final DpnVpninterfacesList dpnInfo) {
    LOG.trace("add : key: {}, value: {}", dpnInfo.getKey(), dpnInfo);
    final String routerUuid = identifier.firstKeyOf(RouterDpnList.class).getRouterId();
    BigInteger dpnId = dpnInfo.getDpnId();
    // check router is associated to external network
    InstanceIdentifier<Routers> id = NatUtil.buildRouterIdentifier(routerUuid);
    Optional<Routers> routerData = SingleTransactionDataBroker.syncReadOptionalAndTreatReadFailedExceptionAsAbsentOptional(dataBroker, LogicalDatastoreType.CONFIGURATION, id);
    if (routerData.isPresent()) {
        Routers router = routerData.get();
        Uuid networkId = router.getNetworkId();
        if (networkId != null) {
            if (natMode == NatMode.Conntrack) {
                BigInteger naptSwitch = NatUtil.getPrimaryNaptfromRouterName(dataBroker, router.getRouterName());
                if (naptSwitch == null || naptSwitch.equals(BigInteger.ZERO)) {
                    LOG.warn("add : NAPT switch is not selected.");
                    return;
                }
                // If it is for NAPT switch skip as the flows would be already programmed.
                if (naptSwitch.equals(dpnId)) {
                    LOG.debug("Skipping the notification recived for NAPT switch {}", routerUuid);
                    return;
                }
                natServiceManager.notify(router, naptSwitch, dpnId, SnatServiceManager.Action.SNAT_ROUTER_ENBL);
            } else {
                coordinator.enqueueJob(NatConstants.NAT_DJC_PREFIX + dpnInfo.getKey(), () -> {
                    WriteTransaction writeFlowInvTx = dataBroker.newWriteOnlyTransaction();
                    WriteTransaction removeFlowInvTx = dataBroker.newWriteOnlyTransaction();
                    LOG.debug("add : Router {} is associated with ext nw {}", routerUuid, networkId);
                    Uuid vpnName = NatUtil.getVpnForRouter(dataBroker, routerUuid);
                    Long routerId = NatUtil.getVpnId(dataBroker, routerUuid);
                    List<ListenableFuture<Void>> futures = new ArrayList<>();
                    if (routerId == NatConstants.INVALID_ID) {
                        LOG.error("add : Invalid routerId returned for routerName {}", routerUuid);
                        writeFlowInvTx.cancel();
                        removeFlowInvTx.cancel();
                        return futures;
                    }
                    extNetGroupInstaller.installExtNetGroupEntries(networkId, dpnId);
                    Long vpnId;
                    if (vpnName == null) {
                        LOG.debug("add : Internal vpn associated to router {}", routerUuid);
                        vpnId = routerId;
                        if (vpnId == NatConstants.INVALID_ID) {
                            LOG.error("add : Invalid vpnId returned for routerName {}", routerUuid);
                            writeFlowInvTx.cancel();
                            removeFlowInvTx.cancel();
                            return futures;
                        }
                        LOG.debug("add : Retrieved vpnId {} for router {}", vpnId, routerUuid);
                        // Install default entry in FIB to SNAT table
                        LOG.info("add : Installing default route in FIB on dpn {} for router {} with vpn {}", dpnId, routerUuid, vpnId);
                        installDefaultNatRouteForRouterExternalSubnets(dpnId, NatUtil.getExternalSubnetIdsFromExternalIps(router.getExternalIps()));
                        snatDefaultRouteProgrammer.installDefNATRouteInDPN(dpnId, vpnId, writeFlowInvTx);
                    } else {
                        LOG.debug("add : External BGP vpn associated to router {}", routerUuid);
                        vpnId = NatUtil.getVpnId(dataBroker, vpnName.getValue());
                        if (vpnId == NatConstants.INVALID_ID) {
                            LOG.error("add : Invalid vpnId returned for routerName {}", routerUuid);
                            writeFlowInvTx.cancel();
                            removeFlowInvTx.cancel();
                            return futures;
                        }
                        LOG.debug("add : Retrieved vpnId {} for router {}", vpnId, routerUuid);
                        // Install default entry in FIB to SNAT table
                        LOG.debug("add : Installing default route in FIB on dpn {} for routerId {} with " + "vpnId {}...", dpnId, routerUuid, vpnId);
                        installDefaultNatRouteForRouterExternalSubnets(dpnId, NatUtil.getExternalSubnetIdsFromExternalIps(router.getExternalIps()));
                        snatDefaultRouteProgrammer.installDefNATRouteInDPN(dpnId, vpnId, routerId, writeFlowInvTx);
                    }
                    if (router.isEnableSnat()) {
                        LOG.info("add : SNAT enabled for router {}", routerUuid);
                        ProviderTypes extNwProvType = NatEvpnUtil.getExtNwProvTypeFromRouterName(dataBroker, routerUuid, networkId);
                        if (extNwProvType == null) {
                            LOG.error("add : External Network Provider Type missing");
                            writeFlowInvTx.cancel();
                            removeFlowInvTx.cancel();
                            return futures;
                        }
                        handleSNATForDPN(dpnId, routerUuid, routerId, vpnId, writeFlowInvTx, removeFlowInvTx, extNwProvType);
                    } else {
                        LOG.info("add : SNAT is not enabled for router {} to handle addDPN event {}", routerUuid, dpnId);
                    }
                    futures.add(NatUtil.waitForTransactionToComplete(writeFlowInvTx));
                    futures.add(NatUtil.waitForTransactionToComplete(removeFlowInvTx));
                    return futures;
                }, NatConstants.NAT_DJC_MAX_RETRIES);
            }
        // end of controller based SNAT
        }
    } else {
        LOG.debug("add : Router {} is not associated with External network", routerUuid);
    }
}

Example 9 with ProviderTypes

use of org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes in project netvirt by opendaylight.

the class RouterDpnChangeListener method removeSNATFromDPN.

// TODO Clean up the exception handling
@SuppressWarnings("checkstyle:IllegalCatch")
void removeSNATFromDPN(BigInteger dpnId, String routerName, long routerId, long routerVpnId, Uuid extNetworkId, WriteTransaction removeFlowInvTx) {
    // irrespective of naptswitch or non-naptswitch, SNAT default miss entry need to be removed
    // remove miss entry to NAPT switch
    // if naptswitch elect new switch and install Snat flows and remove those flows in oldnaptswitch
    Collection<String> externalIpCache = NatUtil.getExternalIpsForRouter(dataBroker, routerId);
    ProviderTypes extNwProvType = NatEvpnUtil.getExtNwProvTypeFromRouterName(dataBroker, routerName, extNetworkId);
    if (extNwProvType == null) {
        return;
    }
    // Get the external IP labels other than VXLAN provider type. Since label is not applicable for VXLAN
    Map<String, Long> externalIpLabel;
    if (extNwProvType == ProviderTypes.VXLAN) {
        externalIpLabel = null;
    } else {
        externalIpLabel = NatUtil.getExternalIpsLabelForRouter(dataBroker, routerId);
    }
    BigInteger naptSwitch = NatUtil.getPrimaryNaptfromRouterName(dataBroker, routerName);
    if (naptSwitch == null || naptSwitch.equals(BigInteger.ZERO)) {
        LOG.error("removeSNATFromDPN : No naptSwitch is selected for router {}", routerName);
        return;
    }
    try {
        boolean naptStatus = naptSwitchHA.isNaptSwitchDown(routerName, routerId, dpnId, naptSwitch, routerVpnId, externalIpCache, removeFlowInvTx);
        if (!naptStatus) {
            LOG.debug("removeSNATFromDPN: Switch with DpnId {} is not naptSwitch for router {}", dpnId, routerName);
            long groupId = NatUtil.createGroupId(NatUtil.getGroupIdKey(routerName), idManager);
            FlowEntity flowEntity = null;
            try {
                flowEntity = naptSwitchHA.buildSnatFlowEntity(dpnId, routerName, groupId, routerVpnId, NatConstants.DEL_FLOW);
                if (flowEntity == null) {
                    LOG.error("removeSNATFromDPN : Failed to populate flowentity for router:{} " + "with dpnId:{} groupId:{}", routerName, dpnId, groupId);
                    return;
                }
                LOG.debug("removeSNATFromDPN : Removing default SNAT miss entry flow entity {}", flowEntity);
                mdsalManager.removeFlowToTx(flowEntity, removeFlowInvTx);
            } catch (Exception ex) {
                LOG.error("removeSNATFromDPN : Failed to remove default SNAT miss entry flow entity {}", flowEntity, ex);
                return;
            }
            LOG.debug("removeSNATFromDPN : Removed default SNAT miss entry flow for dpnID {} with routername {}", dpnId, routerName);
            // remove group
            GroupEntity groupEntity = null;
            try {
                groupEntity = MDSALUtil.buildGroupEntity(dpnId, groupId, routerName, GroupTypes.GroupAll, Collections.emptyList());
                LOG.info("removeSNATFromDPN : Removing NAPT GroupEntity:{}", groupEntity);
                mdsalManager.removeGroup(groupEntity);
            } catch (Exception ex) {
                LOG.error("removeSNATFromDPN : Failed to remove group entity {}", groupEntity, ex);
                return;
            }
            LOG.debug("removeSNATFromDPN : Removed default SNAT miss entry flow for dpnID {} with routerName {}", dpnId, routerName);
        } else {
            naptSwitchHA.removeSnatFlowsInOldNaptSwitch(routerName, routerId, naptSwitch, externalIpLabel, removeFlowInvTx);
            // remove table 26 flow ppointing to table46
            FlowEntity flowEntity = null;
            try {
                flowEntity = naptSwitchHA.buildSnatFlowEntityForNaptSwitch(dpnId, routerName, routerVpnId, NatConstants.DEL_FLOW);
                if (flowEntity == null) {
                    LOG.error("removeSNATFromDPN : Failed to populate flowentity for router {} with dpnId {}", routerName, dpnId);
                    return;
                }
                LOG.debug("removeSNATFromDPN : Removing default SNAT miss entry flow entity for router {} with " + "dpnId {} in napt switch {}", routerName, dpnId, naptSwitch);
                mdsalManager.removeFlowToTx(flowEntity, removeFlowInvTx);
            } catch (Exception ex) {
                LOG.error("removeSNATFromDPN : Failed to remove default SNAT miss entry flow entity {}", flowEntity, ex);
                return;
            }
            LOG.debug("removeSNATFromDPN : Removed default SNAT miss entry flow for dpnID {} with routername {}", dpnId, routerName);
            // best effort to check IntExt model
            naptSwitchHA.bestEffortDeletion(routerId, routerName, externalIpLabel, removeFlowInvTx);
        }
    } catch (Exception ex) {
        LOG.error("removeSNATFromDPN : Exception while handling naptSwitch down for router {}", routerName, ex);
    }
}

Example 10 with ProviderTypes

use of org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes in project netvirt by opendaylight.

the class RouterToVpnListener method onRouterDisassociatedFromVpn.

/**
 * router disassociation from vpn.
 */
@Override
public void onRouterDisassociatedFromVpn(RouterDisassociatedFromVpn notification) {
    String routerName = notification.getRouterId().getValue();
    String vpnName = notification.getVpnId().getValue();
    WriteTransaction writeFlowInvTx = dataBroker.newWriteOnlyTransaction();
    // check router is associated to external network
    String extNetwork = NatUtil.getAssociatedExternalNetwork(dataBroker, routerName);
    if (extNetwork != null) {
        LOG.debug("onRouterDisassociatedFromVpn : Router {} is associated with ext nw {}", routerName, extNetwork);
        handleDNATConfigurationForRouterDisassociation(routerName, vpnName, extNetwork);
        Uuid extNetworkUuid = NatUtil.getNetworkIdFromRouterName(dataBroker, routerName);
        if (extNetworkUuid == null) {
            LOG.error("onRouterDisassociatedFromVpn : Unable to retrieve external network Uuid for router {}", routerName);
            return;
        }
        ProviderTypes extNwProvType = NatEvpnUtil.getExtNwProvTypeFromRouterName(dataBroker, routerName, extNetworkUuid);
        if (extNwProvType == null) {
            LOG.error("onRouterDisassociatedFromVpn : External Network Provider Type missing");
            return;
        }
        long routerId = NatUtil.getVpnId(dataBroker, routerName);
        externalRoutersListener.changeBgpVpnIdToLocalVpnId(routerName, routerId, vpnName, writeFlowInvTx, extNwProvType);
    } else {
        LOG.debug("onRouterDisassociatedFromVpn : Ignoring the Router {} association with VPN {} " + "since it is not external router", routerName, vpnName);
    }
    NatUtil.waitForTransactionToComplete(writeFlowInvTx);
}