Patent ID: 7872967
Filing Date: 2011-01-18
Classification: H04L

Abstract:
1. A method for multi-protocol label switching (MPLS) label-switched path (LSP) protection switching, comprising the steps of: (a) setting a dedicated protection LSP and a return path for one working LSP, the return path transmitting a backward defect indication (BDI) packet indicating whether or not a failure occurs; (b) when the failure occurs, generating, at a transit node of the working LSP, a forward defect indication (FDI) packet having failure information and transmitting the FDI packet to an egress node; (c) when the FDI packet is detected at the egress node, inserting the BDI packet into the return path to an ingress node and switching the working LSP to the protection LSP; and (d) when the BDI packet is detected at the ingress node, multicasting MPLS traffic to the working LSP and the protection LSP, wherein when a first CV (connection verification) packet is detected at the egress node, determining that the working LSP normally works, inserting a second CV packet into the return path and receiving an MPLS packet through the working LSP.