Backup path convergence in the APS environment

Details Backup path convergence in the APS environment Backup path convergence in the APS environment

2006-05-10

2011-10-18

Vu, Huy (Department: 2461)

Multiplex communications

Fault recovery

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

C370S228000, C370S254000, C370S390000, C370S395510

Reexamination Certificate

active

08040795

ABSTRACT:
A SONET network terminated by routers includes working paths and backup paths. The routers pre-establishes in their link state data bases the links in both for both the working and backup paths. However, the links involved in the backup paths are given higher costs, then the links working paths, that the routers select only the links in the working path. If there is a failure in a link in a working path, an APS arrangement provides rapid switchover of the optical links so as to substitute one or more links in the corresponding backup path. This is accomplished by changing the relative costs of the working and backup links involved, so that the routers select the backup links for their routing tables.

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