| 摘要 |
A method of establishing a bi-directional Label Switched Path (LSP) in an optical network includes a bi-directional LSP establishing request as well as available upstream label set and available downstream label set are sent from the first node to the terminal node of the bi-directional LSP in a node-by-node manner. If the available upstream label set or the available downstream label set obtained by the terminal node or other nodes before the terminal node is null, the bi-directional LSP can't be established; if the bi-directional LSP establishing request is sent to the terminal node and both the received available upstream label set and available downstream label set are not null, the terminal node will choose an acceptable upstream label and an acceptable downstream label from the received available upstream label set and available downstream label set. The bi-directional LSP establishing response as well as said upstream label and said downstream label are sent from the terminal node to the foregoing nodes of the bi-directional LSP in a node-by-node manner, the terminal node chooses the upstream label and the downstream label from the available upstream label set and available downstream label set, and each of other nodes except the first node chooses an upstream label and a downstream label to the upstream node till the first node according to the upstream label and the downstream label provided by the downstream node.
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