A Fast Re-route Method Using GMPLS in Optical Transport Networks

摘要

PURPOSE: A fast re-route method through a GMPLS(Generalized Multi-Protocol Label Switching) function is provided to carry out a local repair process for a link restoration by using GMPLS signaling, routing, and LMP(Link Management Protocol) information, thereby realizing the link restoration. CONSTITUTION: If a node receives an LOL(Loss of Light) message(S601), the node extracts a port and a link number by referring to a link information table(S602). The node extracts label information(S603), and extracts an incoming port and a link number(S604). The node requests an OCMF to perform a test for confirming whether an LOL is generated in the incoming port(S605) and then receives a test result from the OCMF(S606). If the LOL is generated, the node writes a channel status message for informing an upper node of a failure(S608), and updates information on a link information table for the current node(S609). The written channel status message is transmitted to the upper node(S610).