Patent ID: 7924707
Filing Date: 2011-04-12
Classification: H04L

Abstract:
1. A method for realizing many to many protection switching of ring network, comprising: determining, by a source node of a switch request, information about a type of the switch request, a destination node of the switch request, a flag of long or short path, a status of bridging and switching, a channel number of protected working channel, and utilization condition of protection channels of M:N protection switching of the ring network; wherein one of the protection channels that is available to be used by the protection switching, the information of flag of long or short path of the protection channel, and the status of bridging and switching are determined based on the utilization condition of protection channels in a utilization condition table saved locally at the source node, and wherein the utilization condition table comprising the utilization condition of protection channels in each span of the ring network is saved by each of network nodes in the ring network; carrying the information and information about the source node of the switch request in a signaling and transferring the signaling on the ring network; wherein the signaling is based on the Automatic Protection switching (APS) protocol signaling, and is carried and transmitted by overhead bytes or a Protocol Data Unit(PDU) message; wherein the signaling is transferred through a protection channel in the ring network or a private control channel in the ring network; in the case the signaling is transmitted by a private control channel, the channel number of the protection channel initiating the switch request is carried in the signaling; upon receipt of the signaling, performing the M:N protection switching of the ring network by a ring network node according to the information in the signaling; and upon receipt of the switch request, updating the utilization condition of protection channels in the utilization condition table saved locally by a network node of the ring network based on the content carried by the signaling of the switch request, and determining whether the corresponding protection channel is allowed to be used based on the condition of a local switch request, and if yes, transferring the switch request to the destination end of the span corresponding to the switch request, otherwise, terminating the switch request.