Patent ID: 9590844
Date: 2017-03-07
CPC Classifications: H04L

Claim:
1. A method comprising: by a network device, identifying, based on network topology information obtained by an interior gateway protocol (IGP) executed by the network device, a potential next next hop merge point network device at least two hops from the network device that is (i) in an IGP area in which the PLR network device is positioned and (ii) along a path that avoids a given protected node within the IGP area; by the network device, automatically establishing a bypass label switched path (LSP) to the potential next next hop merge point network device, wherein the bypass LSP follows a path that avoids the protected node; by the network device, automatically establishing a targeted label distribution protocol (LDP) session to the potential next next hop merge point network device; by the network device, obtaining a label mapping from the potential next next hop merge point network device using the targeted LDP session; and by the network device, programming forwarding information to include a backup path to the potential next next hop merge point network device with a label stack having an inner label from the obtained label mapping for the potential next next hop merge point network device and an outer label for the bypass LSP to the potential next next hop merge point network device.