Alcatel-Lucent 7210 SAS M - BGP-AD and Target LDP (T-LDP) Interaction; Figure 49: BGP-AD and T-LDP Interaction

BGP Auto-Discovery for LDP VPLS
Page 290 7210 SAS M Services Guide
BGP-AD and Target LDP (T-LDP) Interaction
BGP is responsible for discovering the location of VSIs that share the same VPLS membership.
LDP protocol is responsible for setting up the pseudowire infrastructure between the related VSIs
by exchanging service specific labels between them.
Once the local VPLS information is provisioned in the local PE, the related PEs participating in
the same VPLS are identified through BGP AD exchanges. A list of far-end PEs is generated and
triggers the creation, if required, of the necessary T-LDP sessions to these PEs and the exchange of
the service specific VPN labels. The steps for the BGP AD discovery process and LDP session
establishment and label exchange are shown in Figure 49.
Figure 49: BGP-AD and T-LDP Interaction
Key:
1. Establish I-BGP connectivity RR.
2. Configure VPN (10) on edge node (PE3).