Patent ID: 9491095
Filing Date: 2016-11-08
CPC Classification: H04L

Claim Text:
1. A method for implementing multi-protocol label switching traffic engineering (MPLS TE) fast reroute (FRR) in an MPLS TE network, the MPLS TE network including a bypass protection (BP)-label switching path (LSP) protecting a working LSP, the method comprising: receiving, at an at least one intermediate node of the working LSP, a packet including a label, wherein the label is an incoming label of the working LSP from an upstream adjacent node in the working LSP; replacing, at the at least one intermediate node, the label in the packet with an outgoing label of a wrapping protection (WP)-LSP when detecting a downlink adjacent node of the at least one intermediate node in the working LSP is unreachable, wherein the WP-LSP is in a reverse direction of the working LSP; and forwarding the packet with the outgoing label in the WP-LSP to an ingress node of the BP-LSP, wherein the ingress node of the BP-LSP forwards the packet via the BP-LSP to an egress node of the BP-LSP and the packet is forwarded from the BP-SLP to the working LSP.