Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2005-11-14
2009-11-24
Ryman, Daniel J. (Department: 2419)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S224000, C370S258000, C370S403000, C370S404000, C370S405000, C709S242000, C709S243000
Reexamination Certificate
active
07623446
ABSTRACT:
A virtual ring representing a community of interest is constructed from an interconnected mesh of nodes in a packet network. The virtual ring instantiates ring labels in respective forwarding tables for each node in the virtual ring and then advertises the ring labels to all other nodes in the virtual ring, for example by flooding BGP advertisements. Data packets entering the ring are assigned a ring label which is then stripped off when exiting the ring. The data packets are forwarded around the virtual ring using the ring labels. The virtual ring can operate using BGP/LDP Multi Protocol Label Switching (MPLS). Multiple virtual rings can be bridged together using a central hub or alternatively multiple virtual rings can be redundantly bridged together using tandem hubs.
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Allan David
Ashwood Smith Peter
Blake Cassels & Graydon LLP
Crutchfield Christopher
Daniels Kent
Nortel Networks Limited
Ryman Daniel J.
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