Method for sharing part of path resources of main channel and backup channel in ASON (automatically switched optical network)

Abstract

The invention discloses a method for sharing part of path resources of a main channel and a backup channel in an ASON (automatically switched optical network). The method comprises the following steps: all path share markers in network topology are set to be non-sharable; the main channel is established and passes m nodes, and the (m-1) path passed by the main channel is removed from the network topology; the share marker of the (m-1) path is judged with a DFS (depth first search) algorithm, non-sharable paths are removed from the network topology, and sharable paths are retained; the backup channel in the network topology is calculated with an OSPF (open shortest path first) protocol. With adoption of the method, resource share on part of paths is allowed for permanent (1+1) main and backup channels, only one channel of the permanent (1+1) main and backup channels can be allowed in a working state, so that share of part of path resources cannot affect signal transmission, backup channels can be established continuously to protect follow-up failure of the non-sharable paths when the traditional permanent (1+1) backup channel cannot be established, meanwhile, the idle resource occupation amount of the backup channel is reduced, and the adaptability of the permanent (1+1) protection function to the network topology is improved.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a method for sharing partial path resources of active and standby channels in ASON. Background technique [0002] ASON (Automatically Switched Optical Network, Automatically Switched Optical Network) is a flexible and highly scalable optical network that can directly provide services on demand. The transmission equipment is the basic transmission carrier of ASON, usually providing linear or ring group net structure. ASON adds a distributed intelligent control plane on the basis of the traditional optical network transmission plane and management plane, which combines transmission, switching and data networks, and realizes routing settings, end-to-end service scheduling and network management in the true sense. Automatic recovery. The control plane shields the underlying signal transmission process and provides a logical optical channel to the upper layer. When the optica...

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Problems solved by technology

[0005] For logical channels that carry important transmission services, the permanent 1+1 protection function is almost necessary and can basically guarantee the stability of transmission services. For a long time, the resources of the backup channel are idle. Therefore, in a network topology where resources are relatively scarce, whether to use the permanent 1+1 protection function to protect important transmission services needs to be carefully considered.

[0006] With the traditional permanent 1+1 protection function, the backup channel cannot occupy the resources of the main channel. Simultaneous failure of the active and standby channels will not occur, but if figure 1 shown when only a few paths are faulty and most resources are available, or when figure 2 In some special network topology scenarios shown, the route calculation of the backup channel will fail, resulting in the failure of the permanent 1+1 protection function

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