3Com Switch 8800 Family Configuration Guide

52
VPLS CONFIGURATION
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The service processor card mentioned in this chapter refers to the 3C17548 VPLS
Application Module.
VPLS Overview
Introduction to VPLS Today, IP networks have spread throughout the world. And the operators are
focusing on using their existing IP networks to provide enterprises with low-cost
private networks. Now, an easily implemented technique called MPLS VPN
(multiprotocol label switching VPN) emerges as the times require, which enables
the operators to provide arbitrary-rate MPLS-based virtual private network (VPN)
services over IP networks.
MPLS VPN services fall into two types: L3 MPLS VPN and L2 MPLS VPN. The latter
includes VPLS (virtual private LAN service) and VLL (virtual leased line). VLL only
applies to point-to-point networking, while VPLS can apply to
multipoint-to-multipoint VPN networking. VPLS provides the operators using
point-to-point L2VPN with a better solution. In addition, unlike L3VPN, VPLS does
not participate in user’s internal routing. Now, operators need only manage and
operate a single network to provide multiple kinds of services such as best-effort,
L3VPN, L2VPN, traffic-engineering, and distinguished services. This greatly reduces
their costs on network construction, operation and maintenance.
With VPLS, users in different areas can be connected with each other through
MAN/WAN just like they are in one LAN. Switch 8800 Family series provide a VPLS
solution. This solution uses MPLS-based virtual links as the links of Ethernet
bridges and provides transparent transmission LAN services (TLS) over MPLS
networks.
The following table lists the acronyms referred in this document:
Tab le 568 Acronyms
Acronym Full name
AC Attachment Circuit
CE Customer Edge
FEC Forwarding Equivalence Class
FR Frame Relay
NPE Network Facing PE
PE Provider Edge Router
PW Pseudowire
PHP Penultimate Hop Popping