Enabling the Exchange of Labeled IPv4 Routes

In inter-AS VPN Option C mode, a BGP LSP needs to be established between ASs, and labeled IPv4 routes need to be exchanged between BGP peers.

Procedure

Configure the PE.
1. Run system-view
  The system view is displayed.
2. Run bgp as-number
  The BGP view is displayed.
3. Run peer ipv4-address label-route-capability
  The function to exchange labeled IPv4 routes with the ASBR in the same AS is enabled.
4. Run commit
  The configuration is committed.
Configure the ASBR.
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. Run ip address ip-address { mask | mask-length }
  The IP address of the interface is configured.
4. Run mpls
  The MPLS capability is enabled.
5. Run commit
  The configuration is committed.
6. Run quit
  Return to the system view.
7. Run bgp as-number
  The BGP view is displayed.
8. Run peer ipv4-address label-route-capability
  The function to exchange labeled IPv4 routes with the PE in the same AS is enabled.
  
  In inter-AS VPN Option C mode, you must establish an inter-AS VPN LSP. The related PEs and the ASBRs exchange public network routes with the MPLS labels.
  
  The ASBR establishes a common EBGP peer relationship with the remote ASBR to switch labeled IPv4 routes.
  
  The public network routes with the MPLS labels are advertised by MP-BGP. According to relevant standards (Carrying Label Information in BGP-4), the label mapping information of a route is carried in advertised BGP update packets. This feature is implemented using extended BGP attributes, which requires BGP peers to process the labeled IPv4 routes.
9. Run peer ipv4-address as-number as-number
  The peer ASBR is specified as an EBGP peer.
10. Run peer ipv4-address label-route-capability
  The function to exchange labeled IPv4 routes with the peer ASBR is enabled.
11. Run commit
  The configuration is committed.