Route protection in a communication network

Details Route protection in a communication network Route protection in a communication network

2008-05-27

2008-05-27

Abdullahi, Salad E (Department: 2157)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

Alternate path routing

C714S004110, C370S216000, C370S242000

Reexamination Certificate

active

09848743

ABSTRACT:
A communications network comprises a lower transport layer and an upper overlay incorporating a plurality of routers. Adjacencies are defined between respective pairs of routers. Path protection is provided by defining a software model of the overlay of the network and defining in the model a hierarchy of protection levels for the main path. Each protection level is characterised by a respective set of one or more broken adjacencies in the model, the adjacencies to be broken being determined from a knowledge of the underlying topology. A protection level is selected and a protection path avoiding the broken adjacencies associated with that protection level is calculated. If this calculated path is not available in the real network, a lower protection level in the hierarchy is selected and the protection path calculation repeated. The process continues until a suitable protection path is identified.

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