Link-level protection of traffic in a packet-switched network

Details Link-level protection of traffic in a packet-switched network Link-level protection of traffic in a packet-switched network

2005-05-31

2005-05-31

Sam, Phirin (Department: 2661)

Multiplex communications

Fault recovery

Bypass an inoperative channel

C370S216000, C370S220000

Reexamination Certificate

active

06901048

ABSTRACT:
In a packet-switched network having a plurality of nodes interconnected by links, pre-defined protection paths provide protection of a selected plurality of links. Adjacent nodes connected by a protected link are adapted to detect a failure of the protected link, to encapsulate packets within tunnel packets, to differentiate between tunnel packets and non-tunnel packets and to exchange the tunnel packets via a protection path rather than via the failed link. This results in faster automatic protection switching of packet-based traffic. The invention is particularly suited to an Internet Protocol network.

REFERENCES:
patent: 5850505 (1998-12-01), Grover et al.
patent: 5870382 (1999-02-01), Tounai et al.
patent: 6163525 (2000-12-01), Bentall et al.
patent: 6456626 (2002-09-01), Whiting et al.
patent: 6512740 (2003-01-01), Baniewicz et al.
patent: 6549513 (2003-04-01), Chao et al.
patent: 6643254 (2003-11-01), Kajitani et al.

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