METHOD, SYSTEM AND NODE DEVICE FOR REALIZING SERVICE PROTECTION IN THE AUTOMATICALLY SWITCHED OPTICAL NETWORK

摘要

The present invention refers to the field of network communication technique, and in examples a method for realizing service protection in the automatically switched optical network is provided. The method includes following steps: after any defect occurs on the working paths that carry the service, the first node and the last node of the said working paths send the requests to recover the paths establishment in opposite directions respectively; the middle nodes on the recovering paths establish connections according to the recovering paths establishment request, and transmit the said recovering paths establishment request in every hopping, until the establishment of the said recovering paths is finished; the service is switched from the said working paths to the said recovering paths. A system for realizing service protection in the automatically switched optical network and a node device in the automatically switched optical network are also provided. The paths recovering process can be faster observably using this invention, and the recovering time can be cut, and the work efficiency and reliability can be improved, and the service can be promised to set right.