VPLS interworking allows different types of VPLS networks to communicate.
LDP VPLS uses LDP signaling packets that carry the FEC 128 TLV to establish and maintain PWs after VPLS members are manually specified. BGP VPLS uses BGP to automatically discover VPLS members and BGP signaling packets to establish and maintain PWs. BGP AD VPLS uses BGP to automatically discover VPLS members and uses LDP signaling packets that carry the FEC 129 TLV to establish and maintain PWs. LDP VPLS applies to VPLS networks with few sites, whereas BGP VPLS and BGP AD VPLS apply to VPLS networks with large numbers of sites. For carriers with both LDP VPLS and BGP VPLS or both LDP VPLS and BGP AD VPLS networks, interworking between LDP VPLS and BGP VPLS or between LDP VPLS and BGP AD VPLS enables them to improve VPLS network expansibility and reduce network operation costs.
Before configuring VPLS interworking, complete the following tasks:
Configure interface IP addresses and routes on PEs and SPEs to ensure IP connectivity.
Configure LSR IDs and basic MPLS functions on PEs and SPEs.
Establish tunnels between PEs and between PEs and SPEs to transmit service traffic.