Establishing MP-IBGP Peer Relationships Between PEs

MP-IBGP uses extended community attributes to advertise VPNv6 routes between PEs.

Context

If VPN sites in a basic BGP/MPLS IPv6 VPN need to communicate, PEs must use MP-IBGP to advertise VPNv6 routes with the RD information to each other. Since all the PEs reside in the same AS, MP-IBGP peer relationships can be set up between them. In the current implementation, IPv4 BGP peer relationships are set up between PEs.

Perform the following steps on each PE.

Procedure

Run system-view
The system view is displayed.
Run bgp as-number
The BGP view is displayed.
Run peer ipv4-address as-number as-number
A peer PE is configured as a BGP peer.
Run peer ipv4-address connect-interface loopback interface-number
An interface used to establish a TCP connection is configured.

A PE must use a loopback interface address with a 32-bit mask to set up an MP-IBGP peer relationship with the peer PE so that VPN routes can recurse to tunnels. The route to the local loopback interface is advertised to the peer PE using an IGP on the MPLS backbone network.
Run ipv6-family vpnv6
The BGP-VPN IPv6 address family view is displayed.
Run peer ipv4-address enable
The function to exchange VPN-IPv6 routes with the BGP peer is enabled.
Run commit
The configuration is committed.