Configuring External Route Exchanges Between Level 2 Carrier PEs

An MP-BGP peer relationship is established between Level 2 carrier PEs to exchange IPv4 VPN routes.

Perform the following steps on the Level 2 carrier PE that accesses clients.

Run system-view
The system view is displayed.
Run bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
Run peer ipv4-address as-number { as-number-plain | as-number-dot }
The remote PE is configured as a peer.
Run peer ipv4-address connect-interface loopback interface-number
The interface for setting up a TCP connection is specified.
(Optional) Run peer ipv4-address ebgp-max-hop [ hop-count ]
The maximum number of hops supported in an EBGP connection is specified.

If the MP-EBGP peer relationship exists between the Level 2 carrier PEs, perform Step 5.
Run ipv4-family vpnv4 [ unicast ]
The BGP VPNv4 address family is displayed.
Run peer ipv4-address enable
The exchange of the IPv4 VPN routes with the peer is enabled.
Run commit
The configuration is committed.