Ldp Signaling For Vpls Overview; Targeted Sessions - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BGP AND MPLS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

JunosE 11.3.x BGP and MPLS Configuration Guide
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LDP Signaling for VPLS Overview

Targeted Sessions

588
signaling is actually a BGP-MPLS application that has much in common with BGP/MPLS
VPNs.
The procedures for configuring BGP signaling for BGP/MPLS VPNs and for VPLS are
similar except, for VPLS, you must configure both of the following BGP address families:
L2VPN—The L2VPN address family enables you to configure the PE router for VPLS
(or VPWS) L2VPNs to exchange layer 2 network layer reachability information (NLRI)
for all VPLS (or VPWS) instances. Optionally, you can use the signaling keyword with
the address-family command for the L2VPN address family to specify BGP signaling
of VPLS reachability information. Currently, you can omit the signaling keyword with
no adverse effects.
VPLS—The VPLS address family enables you to configure the PE router to exchange
layer 2 NLRI for a specified VPLS instance.
BGP can exchange information in a VPLS topology within these address families.
Specifically, BGP builds a full mesh of label-switched paths (LSPs) among all of the
VPLS instances on each of the PE routers participating in a particular VPLS domain.
Configuring BGP Signaling for VPLS on page 604
Configuring BGP Routing on page 3
Configuring BGP-MPLS Applications on page 385
When you configure VPLS with LDP signaling, LDP supports a full mesh of pseudowires
among the participating PE routers. This is analogous to BGP signaling, in which BGP
builds a full mesh of label-switched paths (LSPs) among all of the VPLS instances on
each of the PE routers participating in a particular VPLS domain.
Targeted Sessions on page 588
PWid FEC Element TLV on page 589
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.
Copyright © 2010, Juniper Networks, Inc.