Recovery method, device and network node for multiplexing protection service

Abstract

The embodiment of the invention provides a method, a device and a network node for restoring multiplex section protection business, wherein an initial node of a business obtains ring automatically-protected reverse state information of a multiplex section sharing protection ring where the business passes through, the initial node of the business judges whether the multiplex section sharing protection ring fails or not according to the ring automatically-protected reverse state and the obtained ring topology and port alarm state information, and if the multiplex section sharing protection ringfails, and then, a rerouting is triggered to recover the business. The rerouting can be rapidly and accurately triggered in time through the method, the device and the network node of the invention.

Description

technical field [0001] The invention relates to optical network technology, in particular to a recovery method, device and network node of a multiplexing section protection service. Background technique [0002] SDH (Synchronous Digital Hierarchy) is a mature optical transmission technology that has been widely used at present. In SDH technology, multiplex section shared protection ring is the most representative technology in SDH network protection mechanism. The multiplex section shared protection ring is divided into two types: two-fiber and four-fiber. The four-fiber multiplex section ring supports section protection in addition to ring protection. The multiplex section sharing protection ring uses the APS (Automatic Protection Switching) protocol to make each node on the ring work together to complete the protection switching when a fault occurs, so that the service interruption time is less than 50ms. [0003] ASON (Automatically Switched Optical Network) introduces a...

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Problems solved by technology

[0006] However, this method will first cause a delay of 50 ms; secondly, in the absence of the multiplex section suppression function, it may not be able to deal with the misconnection of the service due to the multiplex section protection switching without channel alarm, but the service is actually interrupted In the end, because the service channel alarm may be caused by the voice service signal of the first and last node itself, in order to prevent rerouting by mistake, it is necessary to use a certain delay or detection mechanism to determine whether it is caused by a failure of the voice service signal channel alarms, which in turn will lead to delays in judgment

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