Interoperability Between BGP Signaling and LDP Signaling in VPLS
You can configure a VPLS routing instance where some of the PE routers use BGP for
signaling and some use LDP for signaling.
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.
The following concepts form the basis of the configuration needed to include both
BGP-signaled and LDP-signaled PE routers in a VPLS routing instance:
•
PE router mesh group—Consists of a set of routers participating in a VPLS routing
instance that share the same signaling protocol, either BGP or LDP, and are also fully
meshed. Each VPLS routing instance can have just one BGP mesh group. However,
you can configure multiple LDP mesh groups for each routing instance.
•
Border router—A PE router that must be reachable by all of the other PE routers
participating in a VPLS routing instance, whether they are LDP-signaled or BGP-signaled.
Bidirectional pseudowires are created between the border router and all of these PE
routers. The border router is aware of the composition of each PE mesh group configured
as a part of the VPLS routing instance. It can also have direct connections to local CE
routers, allowing it to act as a typical PE router in a VPLS routing instance.
The following sections describe how the LDP-signaled and BGP-signaled PE routers
function when configured to interoperate within a VPLS routing instance:
•
LDP-Signaled and BGP-Signaled PE Router Topology on page 1279
•
Flooding Unknown Packets Across Mesh Groups on page 1281
•
Unicast Packet Forwarding on page 1281
LDP-Signaled and BGP-Signaled PE Router Topology
Figure 64 on page 1280 illustrates a topology for a VPLS routing instance configured to
support both BGP and LDP signaling. Router B is the border router. Routers PE1 and PE2
are in the LDP-signaled mesh group LDP-1. Routers PE3, PE4, and PE5 are in the
LDP-signaled mesh group LDP-2. Routers PE6, PE7, PE8, and router B (the border router)
are in the BGP-signaled mesh group. The border router also acts as a standard VPLS PE
router (having local connections to CE routers). All of the PE routers shown are within
the same VPLS routing instance.
1279Copyright © 2017, Juniper Networks, Inc.
Chapter 35: Configuring Virtual Private LAN Service
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