Patent ID: 8976645
Filing Date: 2015-03-10
Classification: H04L

Abstract:
1. A method comprising: establishing a repair label switched path (LSP) for a primary LSP having a head-end node, the repair LSP extending from a neighboring upstream node of the head-end node to a downstream neighboring node of the head-end node in a network; detecting a failure of the head-end node; rerouting, by the neighboring upstream node, traffic onto the repair LSP, the rerouted traffic to rejoin the primary LSP at the downstream neighboring node; refreshing, by the neighboring upstream node, state of the primary LSP to maintain the primary LSP after failure of the head-end node; receiving, by the neighboring upstream node, a request from the head-end node to protect the head-end node from failure; and establishing the repair LSP in response to the request, wherein the primary LSP is associated with one or more address prefixes, and the rerouting reroutes traffic destined for the one or more address prefixes onto the repair LSP, and wherein the request indicates a selected subset of address prefixes reachable by the head-end node from a routing table and the rerouting reroutes traffic destined for the selected subset of address prefixes onto the repair LSP by associating said selected subset of address prefixes to a backup routing table.