Recovery method for control plane after node restart in automatic switching optical network

Abstract

The present invention discloses a recovery method of the control plane after a node in an ASON network restarts. The method includes three steps. Firstly, after receiving a Hello message from an adjacent restarting node, a non-restarting node sends a RSVP message to the adjacent restarting node; secondly, the resending timers on all of the nodes sending the RSVP messages are started, and if the responses of the RSVP messages are not received before the resending timers are overtime, then the RSVP messages are continuously sent in a preset interval until the resending timers are cleared after the responses of the RSVP messages are received; thirdly, the automatic maintenance timers on the nodes without the establishment of RSVP state maintenance with neighbors are started, and before the automatic maintenance timers are overtime, the refreshment of the RSVP state is restrained until the automatic maintenance timers are cleared after the establishment of RSVP state maintenance with the neighbors is achieved. The present invention realizes the recovery of the control plane after a plurality of discretionally continuous or discontinuous nodes restart.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method for recovering a control plane after a node is restarted in an ASON (Automatic Switched Optical Network, Automatically Switched Optical Network). Background technique [0002] In the ASON network, there is a basic principle: the failure of the control plane cannot affect the transmission plane, resulting in service interruption or instantaneous interruption. Therefore, when the control plane fails, such as after the node is restarted, it is very important to restore the original control information and re-control the business. In the ASON network, the failure of the control plane can be divided into two situations: one is that the network element node fails, such as the node restarts, and the control information is lost, but the underlying services still exist; the other situation is that the control channel fails, If the link between the two nodes connecting the co...

AI Technical Summary

Problems solved by technology

In an ASON network, the failure of the control layer cannot affect the services of the transport plane. In the above scenario, the restart of multiple nodes on the control plane leads to the deletion of services. This situation should not happen

[0005] In the Chinese patent application published on April 28, 2004, the publication number is CN1492601.A, and the invention name is "Recovery method for control plane after multi-node restart in intelligent optical network". The normal processing flow of the message, the actual interconnection and interoperability is not high; at the same time, the invention is only applicable to the restart of multiple consecutive nodes, and does not mention the failure of the control plane in other cases, and the application has certain limitations

[0006] In the Chinese patent application published on July 12, 2006, the publication number is CN1801802A, and the invention name is "method for node restart and recovery on a general multi-protocol label switching path", it does not fully consider the needs of the ASON system, and also That is, once the signaling message sent by a certain node does not respond, it will also cause the deletion of the service, so it is not suitable in the ASON network

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