Pseudowire Redundancy; Vll Resilience With Two Destination Pe Nodes; Figure 24: Vll Resilience - Alcatel-Lucent 7750 SR OS Service Manual

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Pseudowire Redundancy

Pseudowire redundancy provides the ability to protect a pseudowire with a pre-provisioned

pseudowire and to switch traffic over to the secondary standby pseudowire in case of a SAP and/or

network failure condition. Normally, pseudowires are redundant by the virtue of the SDP

redundancy mechanism. For instance, if the SDP is an RSVP LSP and is protected by a secondary

standby path and/or by Fast-Reroute paths, the pseudowire is also protected. However, there are a

couple of applications in which SDP redundancy does not protect the end-to-end pseudowire path:

resilience for broadband service subscribers accessing the broadband service on the service

provider BRAS.

There are two different destination 7x50 PE nodes for the same VLL service. The main

use case is the provision of dual-homing of a CPE or access node to two 7x50 PE nodes

located in different POPs. The other use case is the provision of a pair of active and

standby BRAS nodes, or active and standby links to the same BRAS node, to provide

service resiliency to broadband service subscribers.

The pseudowire path is switched in the middle of the network and the 7x50 pseudowire

switching node fails. The 7x50 supports pseudowire switching.

illustrates the application of pseudowire redundancy to provide Ethernet VLL service

Figure 11: VLL Resilience

7750 SR OS Services Guide