Multiplex communications – Wide area network – Packet switching
Patent
1990-12-20
1993-06-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 371 82, 371 111, 371 112, H04J 314
Patent
active
052186016
ABSTRACT:
A method includes the steps of 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 is connected to a sender node which detects the failure, information is transferred to the sender node via the N nodes, and the sender node serves as a start point of each alternate path which is to be established. The method also includes the step of c) broadcasting a restoration message to links which outgo from the sender node, where the restoration message has 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. The method als includes a step of d) determining whether or not a node being considered is one of the candidate nodes, where the node which is one of the candidate nodes is 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.
REFERENCES:
patent: 4953162 (1990-08-01), Lyons et al.
patent: 4993015 (1991-02-01), Fite, Jr.
Chujo Takafumi
Komine Hiroaki
Miyazaki Keiji
Ogura Takao
Soejima Tetsuo
Blum Russell W.
Fujitsu Limited
Olms Douglas W.
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