Configuring a BGP LSP

Context

Before a BGP LSP is established, a routing policy must be configured to control label distribution. The egress of the BGP LSP to be established needs to distribute an MPLS label to the route advertised to an upstream node. If a transit node receives a labeled IPv4 route from downstream, the downstream node must re-distribute an MPLS label to the transit node and advertises the label upstream.

Procedure

Perform the following steps on each CSG and MASG:
1. Run system-view
  The system view is displayed.
2. Run route-policy route-policy-name permit node node
  A Route-Policy node is created.
3. Run apply mpls-label
  The local device is enabled to distribute MPLS labels to IPv4 routes.
  
  By default, the action of distributing MPLS labels to public routes is not configured in the routing policy.
4. Run quit
  Return to the system view.
5. Run bgp { as-number-plain | as-number-dot }
  The BGP view is displayed.
6. Run peer { ipv4-address | group-name } route-policy route-policy-name export
  A routing policy for advertising routes matching Route-Policy conditions to a BGP peer (group) is configured.
  
  By default, no routing policy for filtering routes from its BGP peer (group) or routes to be advertised to its BGP peer (group) is configured.
  
  Repeat this step for each BGP peer.
7. Run network ip-address [ mask | mask-length ] [ route-policy route-policy-name ]
  The route destined for the loopback interface address is advertised.
  
  This route is labeled and advertised along a path over which a BGP LSP is established.
Perform the following steps on each AGG and core ABR:
1. Run system-view
  The system view is displayed.
2. Run route-policy route-policy-name permit node node
  A Route-Policy node is created.
3. Run if-match mpls-label
  A matching rule based on the MPLS label is created.
  
  By default, no matching rule based on the MPLS label is configured.
4. Run apply mpls-label
  The local device is enabled to distribute MPLS labels to IPv4 routes.
  
  By default, the action of distributing MPLS labels to public routes is not configured in the routing policy.
5. Run quit
  Return to the system view.
6. Run bgp { as-number-plain | as-number-dot }
  The BGP view is displayed.
7. Run peer { ipv4-address | group-name } route-policy route-policy-name export
  A routing policy for advertising routes matching Route-Policy conditions to a BGP peer (group) is configured.
  
  By default, no routing policy for filtering routes from its BGP peer (group) or routes to be advertised to its BGP peer (group) is configured.
  
  Repeat this step for each BGP peer.