Patent ID: 8134920
Filing Date: 2012-03-13
Classification: H04J,H04L,H04Q

Abstract:
1. A backup path bandwidth keeping method for keeping a bandwidth of a backup path to which an active path is switched when the active path becomes unavailable in nodes of a communication network, the backup path bandwidth keeping method including: a step of keeping a backup path bandwidth by sending identification information indicating that a path for which a bandwidth is to be kept is a backup path, and sending risk classification number information of at least one of a link or a node of the link and the node through which an active path of the backup path to be set passes, to a destination-side node existing in a destination side of the backup path via each node on a route, the route being determined for the backup path before sending the identification information to the destination-side node; and a step of sending, before the active path becomes unavailable and to a source side node existing in a start point side of the backup path via each node on the route, a signaling message for keeping the bandwidth of the backup path, the signaling message including, for each link of the backup path, channel identification information of a backup channel or channel group identification information of a backup channel group, the channel identification information and the channel group identification information each specifying a communication resource to be used by the backup path on each link through which the backup path passes, wherein the channel identification information identifies a particular channel as the backup channel and the channel group identification information identifies a particular backup channel group as the backup channel group.