Mechanism for automatic protection switching in a router

Details Mechanism for automatic protection switching in a router Mechanism for automatic protection switching in a router

2005-12-13

2005-12-13

Nguyen, Hanh (Department: 2662)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C370S419000, C370S426000

Reexamination Certificate

active

06975587

ABSTRACT:
In a router, externally received messages addressed to an active line card are bridged to a protection line card. Each line card in the router is programmed to respond to such externally received messages by directing them to the protection line card associated with the active line card as well as to the active line card. The protection line card is configured with inbound and outbound path tables that are the clones of the inbound and outbound path tables of its corresponding active line card. Bridging is accomplished by revising descriptors stored in a plurality of line cards to indicate an association between an active one of the line cards and its protection line card. Received messages are addressed using the revised descriptors to the active line card and also to its protection line card. Upon failure of an active line card, its physical interface can be disabled once its protection line card has clones of the inbound and outbound path tables and bridging has been set up.

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