Fast rerouting method through generalized multi-protocol label switching

摘要

The present invention provides a fast rerouting method through Generalized Multi-Protocol Label Switching (GMPLS). The method performs fast rerouting through when a failure occurs on a link and node in an optical network having a plurality of nodes. In the fast rerouting method, current node of the optical network receives the path message for label request from a higher node thereof and establish the main LSP. Further, the current node calculates a detour path therefrom to a next but one node thereof so as to provide against a failure of the next node. Further, if it is checked that the Loss Of Light (LOL) occurs in the current node, the current node establishes the detour path to allow data to flow through the calculated detour path.