Introduction To Vpls - Huawei quidway s7700 Configuration Manual

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Quidway S7700 Smart Routing Switch

Configuration Guide - VPN

7.1 Introduction to VPLS

The Virtual Private LAN Service (VPLS), also called the Transparent LAN Service (TLS) or

virtual private switched network service, is an L2VPN technology that is based on Multi-

Protocol Label Switching (MPLS) and Ethernet technologies.

With the development of Ethernet technology, Ethernet has become a crucial LAN technology.

As an access technology, it is widely applied to Metropolitan Area Network (MAN) and Wide

Area Network (WAN).

Virtual Private LAN Service (VPLS) is used to connect more than one Ethernet LAN segment

through the PSN and make them operate in an environment similar to a LAN.

The VPLS is also called Transparent LAN Service (TLS) or Virtual Private Switched Network

Service, and differs from the point-to-point service of the common L2VPN. With the VPLS

technology, the service provider offers Ethernet-based multi-point service to clients through the

MPLS backbone network.

In a simple case, a VPLS contains multiple sites connected to the Provider Edge Device (PE) to

implement emulated LAN.

Figure 7-1 VPLS architecture

In VPLS, the PSN simulates network bridge devices and forwards packets based on MAC

addresses, or MAC addresses and VLAN tags.

The following lists basic concepts of VPLS:

Issue 01 (2011-07-15)

Huawei Proprietary and Confidential

7 VPLS Configuration