1-37For inter-provider VPN option B, two configuration methods are available:z Do not change the next hop on an ASBR. With this method, you still need to configure MPLS LDPbetween ASBRs.z Change the next hop on an ASBR. With this method, MPLS LDP is not required between ASBRs.Currently, only the second method is supported. Therefore, MP-EBGP routes will get their next hopschanged by default before being redistributed to MP-IBGP. On conventional BGP, however, EBGProutes to be advertised to IBGP do not have their next hops changed by default. If the next hops need tobe changed to the local addresses, you can configure the peer { ip-address | group-name }next-hop-local command. For information about the command, refer to BGP Configuration in the IPRouting Volume.Configuring Inter-Provider VPN Option CConfiguring the PEsYou need to establish ordinary IBGP peer relationship between PEs and ASBR PEs in an AS andMP-EBGP peer relationship between PEs of different ASs.The PEs and ASBR PEs in an AS must be able to exchange labeled IPv4 routes.Follow these steps to configure a PE for inter-provider VPN option C:To do… Use the command… RemarksEnter system view system-view —Enter BGP view bgp as-number —Configure the ASBR PE in thesame AS as the IBGP peerpeer { group-name |ip-address } as-numberas-numberRequiredEnable the PE to exchangelabeled IPv4 routes with theASBR PE in the same ASpeer { group-name |ip-address }label-route-capabilityRequiredBy default, the device does notadvertise labeled routes to theIPv4 peer/peer group.Configure the PE of another ASas the EBGP peerpeer { group-name |ip-address } as-numberas-numberRequiredEnter BGP-VPNv4 subaddressfamily view ipv4-family vpnv4 —Enable the PE to exchangeBGP VPNv4 routinginformation with the peerpeer { group-name |ip-address } enable RequiredConfigure the PE not to changethe next hop of a route whenadvertising it to the EBGP peerpeer { group-name |ip-address }next-hop-invariableOptionalRequired only when RRs areused to advertise VPNv4routes, where the next hop of aroute advertised between RRscannot be changed.
