Configuring Inter-AS Seamless MPLS

In the inter-AS seamless MPLS networking, the access and aggregation layers belong to one AS, and the core layer belong to another AS. An inter-AS BGP LSP is established across the three layers to implement E2E service connectivity.

Pre-configuration Tasks

Before configuring inter-AS seamless MPLS, complete the following tasks:

• Configure IGP protocols to implement connectivity at the access, aggregation, and core layers and enable MPLS LDP to implement the MPLS forwarding on a public network.

• Configure an EBGP peer relationship between each pair of an AGG ASBR and core ASBR and an IBGP peer relationship between each pair of the following nodes:

  • CSG and AGG
  • AGG and AGG ASBR
  • Core ASBR and MASG