Pnni-based multi-link shortest path class-of service routing

Details Pnni-based multi-link shortest path class-of service routing Pnni-based multi-link shortest path class-of service routing

H - Electricity

04

L

H04L 29/02 (2006.01) H04L 12/56 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2337589

The present invention concerns a technique for providing Class-of-Service Routing in an ATM network (10) that utilizes the Private Network-Network Interface (PNNI) protocol. An originating node seeking to route a call to a terminating node does so by initially selecting a shortest length path therebetween. Each successive link on the selected path is examined for sufficient available bandwidth for the Class-of- Service of the call. If every link possesses sufficient available bandwidth, then the call passes on the selected path. Otherwise, should a link on the selected path lack sufficient bandwidth, then a crankback message is sent to the originating node, and the originating node selects the next shortest path. Thereafter, the process of examining each link for sufficient bandwidth is repeated. If no path is found, the call is ultimately blocked.

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