Automatic protection switching (APS) protocol state transition method and device

Abstract

The invention discloses an automatic protection switching (APS) protocol state transition method and device. The method comprises the steps of: receiving an APS message of an opposite end device in an APS protocol; obtaining an APS state of the opposite end device from information carried in the APS message; obtaining the APS state of a local device; and when the APS state of the local device is a no request (NR) state and a requested signal of the NR state is an invalid signal, transiting the APS state of the local device from the NR state to the DNR (No Not Revert) state. The invention can be used for perfecting and implementing the transition condition of the NR state in the APS protocol and transiting the NR state into the DNR state aiming at the special condition that an NR state device receives the APS message of a DNR state device so that two end devices have consistent states, ensures data streams of the two end devices of the APS protocol are not interrupted, and ensures normal communication.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an automatic protection switching APS protocol state transition method and a device thereof. Background technique [0002] The APS (Automatic Protection Switching, automatic protection switching) protocol is a protocol for realizing automatic protection switching. The implementation method of the APS protocol mechanism is simple and the switching is fast. Its basic principle is: when there are multiple paths between point-to-point or point-to-multipoint, backups can be formed between the multiple paths, and the paths in use are defined as As the working path, define other backup paths as protection paths, and quickly switch to other protection paths when the initially selected working path fails. [0003] The devices at both ends of the APS protocol will send APS protocol packets to each other, and the APS status of the peer device will be notified to the local device thr...

AI Technical Summary

Problems solved by technology

However, in practical applications, it may happen that the local device in the NR-null signal state receives the APS packet sent by the peer device in the DNR state. At this time, because there is no provision in the APS protocol, the local device will not be sent NR status will remain unchanged, resulting in inconsistencies in the APS status of the devices at both ends of the APS protocol, resulting in inconsistencies in the paths selected by the devices at both ends of the APS protocol, and the data flow between the devices at both ends will be interrupted, making it impossible to perform normal operations. communication

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