Pseudowire Switching With Protection; Figure 45: Vll Resilience With Pseudowire Redundancy And Switching - Alcatel-Lucent 7750 SR Manual

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Pseudowire Switching with Protection

Pseudowire switching scales VLL and VPLS services over a multi-area network by removing the

need for a full mesh of targeted LDP sessions between PE nodes.

pseudowire redundancy to provide a scalable and resilient VLL service across multiple IGP areas

in a provider network.

PW switching

In the network in

for the purpose of pseudowire signaling. A switching node will need to pass the SAP Interface

Parameters of each PE to the other.T-PE1 sends a label mapping message for the Layer 2 FEC to

the peer pseudowire switching node" for example, S-PE1. It will include the SAP interface

parameters, such as MTU, in the label mapping message. S-PE1 checks the FEC against the local

information and if a match exists, it appends the optional pseudowire switching point TLV to the

FEC TLV in which it records its system address. T-PE1 then relays the label mapping message to

S-PE2. S-PE2 performs similar operations and forwards a label mapping message to T-PE2. The

same procedures are followed for the label mapping message in the reverse direction, for example,

7750 SR OS Services Guide

Metro area B

Metro area A

45, PE nodes act as masters and pseudowire switching nodes act as slaves

Virtual Leased Line Services

illustrates the use of

PW switching