Fujitsu Corporation

Yasuyuki Sato

Keiji Miyazaki

Takafumi Chujo

Yasuki Fujii

Kohei Iseda

Mitsuhiro Azuma

A path switching system and method for a multiple-node ATM network, in which a plurality of paths can be simultaneously switched preserving proper correspondence thereof. A key choosing unit provided in a node chooses first and second sorting keys out of the virtual paths between the nodes, based on a first and second path information stored in a path information memory unit. Two nodes located at both ends of the route failed due to trouble in the ATM network select a first pair of isolated virtual paths having the first sorting key, which were formerly connected to the failed route, and connect them to a first bypass route. The two nodes then connect in a similar way a second pair of isolated virtual paths both having the second sorting key to a second bypass route.

Path switching system and method

A system for searching for alternative routes in a network at the time of a failure in a node or link which executes a stage for initiation of failure restoration processing which starts up failure restoration processing in accordance with various types of messages when a failure occurs at a link or node, a stage for processing a restoration message for searching for an alternative route, a stage for processing an acknowledgment message for reserving an alternative route, a stage for processing a cancellation message for cancelling reservation of an alternative route, a stage for processing a confirmation message for confirming a reserved alternative route and making a switching of cross-connect equipment, a stage for processing a cross-connection completion message for notifying the completion of switching of the cross-connect equipment to the nodes, a stage for processing a cross-connection acknowledgment message for confirming the completion of switching of all of the cross-connect equipment on the alternative route, and a stage for processing a cross-connection confirmation message for performing processing to complete the search for an alternative route and which thereby searches for alternative routes autonomously in a distributed manner.

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Iwate, Japan

Yasuyuki Sato