Configuring Interoperability Between Bgp Signaling And Ldp Signaling In Vpls; Vpls - Juniper EX9200 Features Manual

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Configuring Interoperability Between BGP Signaling and LDP Signaling in VPLS

Copyright © 2016, Juniper Networks, Inc.
This type of configuration only affects the control plane of the VPLS network (how routers
signal and tear down pseudowires to one another in the network). The actual data plane
state and forwarding paths for the VPLS traffic are not modified by the route reflectors.
Effectively, the VPLS pseudowires should take the same paths across the network whether
or not you have configured route reflectors. For a description of how VPLS selects the
best path to a PE router, see
The MAC addresses themselves are not exchanged or processed in any way by BGP.
Each VPLS PE router performs all MAC address learning and aging individually. BGP's
only function relative to VPLS is to exchange messages related to automatic discovery
of PE routers being added to and removed from the VPLS network and the MPLS label
exchange needed to signal a pseudowire from one PE router to another.
VPLS Path Selection Process for PE Routers on page 57
Example: Configuring a Route Reflector
Example: NG-VPLS Using Point-to-Multipoint LSPs
Example: Next-Generation VPLS for Multicast with Multihoming
A single VPLS routing instance can encompass one set of PE routers that use BGP for
signaling and another set of PE routers that use LDP for signaling. Within each set, all of
the PE routers are fully meshed in both the control and data planes and have a
bidirectional pseudowire to each of the other routers in the set. However, the BGP-signaled
routers cannot be directly connected to the LDP-signaled routers. To be able to manage
the two separate sets of PE routers in a single VPLS routing instance, a border PE router
must be configured to interconnect the two sets of routers.
The VPLS RFCs and Internet drafts require that all of the PE routers participating in a
single VPLS routing instance must be fully meshed in the data plane. In the control plane,
each fully meshed set of PE routers in a VPLS routing instance is called a PE router mesh
group. The border PE router must be reachable by and have bidirectional pseudowires
to all of the PE routers that are a part of the VPLS routing instance, both the LDP-signaled
and BGP-signaled routers.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
For LDP BGP interworking to function, LDP-signaled routers can be configured with
forwarding equivalence class (FEC) 128 or FEC 129.
The following sections describe how to configure BGP LDP interworking for VPLS:
LDP BGP Interworking Platform Support on page 16
Configuring FEC 128 VPLS Mesh Groups for LDP BGP Interworking on page 16
Configuring FEC 129 VPLS Mesh Groups for LDP BGP Interworking on page 17
Chapter 3: Configuring Signaling Protocols for VPLS
"VPLS Path Selection Process for PE Routers" on page 57.
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