N+1 protection using a processor-based protection device

Details N+1 protection using a processor-based protection device N+1 protection using a processor-based protection device

2009-08-12

2011-11-15

Yao, Kwang B (Department: 2473)

Multiplex communications

Fault recovery

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

C370S228000

Reexamination Certificate

active

08059526

ABSTRACT:
In an N+1 protection scheme for a router in a data or telecommunications network, a processor-based protection unit has a replica device handle, corresponding to each of the N working units, stored in the protection unit's local memory. Each replica device handle is an image of the connections provided by the corresponding working unit. In one implementation, upon detection of a failure of one of the working units, the router's controller unit sends a single command to instruct the protection unit to reconfigure itself using the corresponding locally stored replica device handle to assume the routing functions of the failed working unit.

REFERENCES:
patent: 6901047 (2005-05-01), Griffith et al.
patent: 2003/0193890 (2003-10-01), Tsillas et al.
patent: 2008/0259786 (2008-10-01), Gonda
patent: 2010/0189114 (2010-07-01), Oishi et al.

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