Enabling BGP Peers to Exchange Labeled IPv4 Routes

Procedure

1. Run system-view

   The system view is displayed.

2. Run bgp { as-number-plain | as-number-dot }

   The BGP view is displayed.

3. Run peer { ipv4-address | group-name } label-route-capability [ check-tunnel-reachable ]

   The ability to exchange labeled IPv4 routes with a BGP peer is enabled.

   By default, the capability of exchanging labeled IPv4 routes is disabled.

   The check-tunnel-reachable parameter helps prevent a data forwarding failure when the CSG and MASG successfully set up an MP-EBGP peer relationship but a section along the LSP between them fails to be established.

   • If the check-tunnel-reachable parameter is specified:

     When a tunnel between a local and remote device is unreachable, the local device advertises an IPv4 unicast route to its peer. When the tunnel is reachable, the local device advertises a labeled IPv4 route.

   • If the check-tunnel-reachable parameter is not specified:

     The local device advertises a labeled IPv4 route, regardless of whether a tunnel between the local and remote devices is reachable.