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CHAPTER 14
VPWS Overview
VPWS Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes virtual private wire service (VPWS) L2VPNs, and contains the
following sections:
VPWS Overview on page 639
BGP Signaling for L2VPNs Overview on page 641
VPWS Components Overview on page 642
VPWS and BGP/MPLS VPNs Overview on page 643
BGP Multihoming for VPWS Overview on page 644
Designated VE Device Selection for a Multihomed Site on page 646
Multihoming Reaction to Failures in the Network on page 648
VPWS Supported Features on page 649
VPWS Platform Considerations on page 649
VPWS References on page 650
VPWS L2VPNs employ layer 2 services over MPLS to build a topology of point-to-point
connections that connect end customer sites in a VPN. These L2VPNs provide an
alternative to private networks that have been provisioned by means of dedicated leased
lines or by means of layer 2 virtual circuits that employ ATM or Frame Relay. The service
provisioned with these L2VPNs is known as Virtual Private Wire Service (VPWS). VPWS
L2VPNs are sometimes called Kompella L2VPNs. You configure a VPWS instance on
each associated edge router for each VPWS L2VPN.
Traditional VPNs over layer 2 circuits require the provisioning and maintenance of separate
networks for IP and for VPN services. In contrast, VPWS enables the sharing of a provider's
core network infrastructure between IP and L2VPN services, reducing the cost of providing
those services.
VPWS also uses BGP as the signaling protocol, and consequently has a simpler design
and requires less provisioning overhead than traditional VPNs over layer 2 circuits. BGP
signaling also enables autodiscovery of L2VPN peers. VPWS is similar to BGP/MPLS
VPNs and VPLS in many respects, because all three types of services employ BGP for
signaling.
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