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CHAPTER 11
VPLS Overview
VPLS Protocol Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes the virtual private LAN service (VPLS), and contains the following
sections:
VPLS Protocol Overview on page 573
VPLS Components Overview on page 574
VPLS and Transparent Bridging Overview on page 576
Subscriber Policies for VPLS Network Interfaces Overview on page 577
BGP Signaling for VPLS Overview on page 579
LDP Signaling for VPLS Overview on page 580
BGP Multihoming for VPLS Overview on page 581
VPLS Supported Features on page 585
VPLS Platform Considerations on page 586
VPLS References on page 587
JunosE Software enables you to configure one or more instances of VPLS, referred to as
VPLS instances, on the router. VPLS employs an Ethernet-based layer 2 VPN to connect
multiple individual LANs across a service provider's MPLS core network. The geographically
dispersed multiple LANs function as a single virtual LAN. VPLS provides a
point-to-multipoint capability for traffic forwarding. In contrast, L2VPNs that enable a
virtual private wire service (VPWS) provide only a point-to-point traffic forwarding
capability.
VPLS preserves the broadcast and multicast capabilities of the physical LANs.
Consequently, any broadcast or multicast traffic from a given customer end station is
sent to all sites that participate in the VPLS instance.
You can use either BGP or LDP to provide signaling for VPLS, as follows:
BGP signaling—VPLS with BGP signaling, which is referred to as BGP-based VPLS,
uses BGP as the protocol that signals reachability for the VPLS domain in which the
VPLS instance participates. You must configure BGP on each provider edge (PE) router
in your topology to provide signaling for each VPLS domain.
573
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