A recovery method for multicast service connection in automatic switching optical network

Abstract

The invention proposes a recovery method for multicasting service connection in an automatically switched optical network, which includes the following steps: a root node calculates and establishes an optical multicasting tree according to a multicasting service demand and sets multicasting service attribute and a multicasting ID, and simultaneously sets recovery strategy for branch nodes; various network elements in a network detect that a fault happens to nodes and/or links; the node network element detecting the fault searches for the service connection on the invalid link and/or the service connection among the invalid network elements; if the service connection comprises the multicasting service connection, the node network element sends the signaling message containing the invalid link and/or invalid node to the branch node network element of the multicasting service connection; the branch node combining the set recovery strategy recalculates one restoration route or one restoration multicasting tree route with the branch node network element serving as a source and a leaf node influenced by the fault serving as a destination; and the branch node starts signaling process of establishing the restoration route or the restoration multicasting tree and sets the attribute and the multicasting ID same in the original service connection for the new service connection.

Description

technical field [0001] The invention belongs to the technical field of survivability in the automatic switching optical network ASON, in particular to the optical multicast service in the ASON network. Background technique [0002] Automatically switched optical network ASON is defined by ITU-T SG15 group, and it is a hot spot in network research and implementation at present. Compared with the traditional optical network, ASON increases the control plane, strengthens the management and control of the network, can dynamically and automatically complete the establishment, removal and modification of the end-to-end optical channel, and when the network fails , can dynamically assign the best recovery route according to network topology information, available resource information, configuration information, etc., and its essence lies in on-demand dynamic bandwidth assignment, intelligent connection management, and fast and effective survivability strategies. [0003] With the ...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a recovery method for automatically switching optical network multicast service connections, avoiding the problem of establishing another group due to insufficient network resources. The problem that the multicast service cannot be restored due to the multicast tree, so that the network resources can be effectively used and the survivability of the multicast service can be improved

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