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Title : Signaling Standby State of Pseudowire Groups in H-VPLS
Author(s) : P. Dutta, et al.
Filename : draft-pdutta-l2vpn-hvpls-standby-00.txt
Pages : 12
Date : 2006-10-17
H-VPLS is an architecture that follows hub-and-spoke connectivity
model among VPLS aware devices and is proposed in [VPLS-LDP] for
creating scalable VPLS implementations. To protect from failure of
the spoke PW or the failure of host PE-rs, MTU-s may be dual homed
to two PE-rs devices for a VPLS instance through primary spoke PW
and secondary(standby) spoke PW. The respective PE-rs devices(s) are
unaware of the primary or secondary status of spoke PWs. So
Broadcast, Unlearned unicast and Multicast (BUM) traffic received
from full mesh core by a PE-rs is replicated to MTU-s over secondary
spoke PW to get dropped at MTU-s. In such scenerios it may be
desirable to block the standby spoke PW at PE-rs end with minimal
compromise on traffic disruption when MTU-s performs a switchover to
secondary spoke PW. This document proposes an extension to PW status
TLV defined in [RFC 4447] to signal Standby or Active state of PW by
MTU-s to PE-rs in a scalable manner.
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