Protection switching at a network node

Details Protection switching at a network node Protection switching at a network node

2007-10-09

2007-10-09

Jain, Raj K. (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

C370S217000, C370S218000, C370S219000, C370S223000, C370S227000, C370S352000, C370S353000, C370S354000, C370S355000, C370S356000, C370S229000, C370S230000, C370S231000, C370S232000

Reexamination Certificate

active

10340083

ABSTRACT:
Protection switching between primary and secondary paths in a packet-based network involves table entries that are pre-programmed with a primary path, a secondary path, and a value that identifies the primary path, referred to as a primary path identifier (PPI). When table entries are accessed to make forwarding decisions, the PPI is compared to a field that identifies that a particular path is down, referred to as a down path identifier (DPI). If the two fields match, (i.e., PPI=DPI), then the secondary path is selected instead of the primary path as the path on which the traffic should be forwarded.

REFERENCES:
patent: 5848227 (1998-12-01), Sheu
patent: 6463062 (2002-10-01), Buyukkoc et al.
patent: 6530032 (2003-03-01), Shew et al.
patent: 6738352 (2004-05-01), Yamada et al.
patent: 2001/0037401 (2001-11-01), Soumiya et al.
patent: 2002/0181395 (2002-12-01), Foster et al.
Forwarding and Control Element Protocol, Internet Engineering Task Force, Feb. 2002.

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