LDP establishes targeted sessions to the remote PEs configured at the edge of the service provider’s MPLS core network. The number of targeted sessions supported for a local PE router is equal to the total number of other PE routers that participate in the VPLS instances configured on the local PE router. As is the case with Martini encapsulation for Ethernet layer 2 services over MPLS, a targeted session to a remote PE router can have many pseudowires that terminate at the same remote PE router.
To enable LDP to establish targeted sessions with remote PEs across the MPLS core, you must issue both the mpls ldp vpls-id command to configure a VPLS identifier for the VPLS instance, and the mpls ldp vpls neighbor command to configure a list of neighbor (peer) addresses to which LDP can send or from which LDP can receive targeted hello messages.