H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 29/14 (2006.01) G11B 23/00 (2006.01) H04J 3/14 (2006.01) H04J 3/16 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2294693
A method and system for protecting virtual traffic travelling through a protected domain consisting of a bridge node connected to a selector node in a working path and a protection path. The method includes upon detecting failure of the traffic channels in the working path, the detecting node transmitting failure information to the selector node along the traffic channels and along an alarm channel in the working path. The method also includes the selector node initiating protection switching of the traffic channels as soon as it receives the failure information along the alarm channel. According to the invention, the alarm channel has a sufficiently high priority relative to the traffic channels to allow the selector node to initiate protection switching before failure information is received along any of the traffic channels. Thus, protection switching can be initiated by the selector node prior to the receipt of alarm cells on traffic channels, which significantly reduced the time during which the traffic channels contain alarm cells. Advantageously, the invention helps prevent premature termination of the end-to-end traffic connection.
Nortel Networks Corporation
Nortel Networks Limited
Smart & Biggar
LandOfFree
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