H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/1
H04Q 1/20 (2006.01) H04L 1/24 (2006.01) H04L 12/56 (2006.01) H04Q 3/00 (2006.01) H04Q 3/66 (2006.01)
Patent
CA 2032620
A method includes the steps of a) detecting a failure which occurs in a node or link, and b) identifying at most N (N is an integer equal to or greater than 2) nodes contained in each path affected by the occurrence of the failure, each path being connected to a sender node which detects the failure, information being transferred to the sender node via the N nodes, and the sender node serving as a start point of each alternate path which is to be established. The method also includes the steps of c) broadcasting a restoration message to links which outgo from the sender node, the restoration message having an identifier of the sender node and identifiers of the N nodes specified for each path affected by the occurrence of the failure, the identifiers of the N nodes specified for each path being candidate nodes of an end point of each alternate path, and d) determining whether or not a node being considered is one of the candidate nodes, the node which is one of the candidate nodes being a destination node. Further, the method includes the steps of e) passing the restoration message through a repeater node which is a node other than the candidate nodes, and f) determining a route via which the restoration message has been transferred to the destination node to be an alternate path connected between the sender node and the destination node.
Chujo Takafumi
Komine Hiroaki
Miyazaki Keiji
Ogura Takao
Soejima Tetsuo
Fetherstonhaugh & Co.
Fujitsu Limited
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