Patent ID: 9300568
Filing Date: 2016-03-29
CPC Classification: H04L

Claim Text:
1. A method implemented by a network device to determine loop free alternatives (LFA) for each next hop in a default route to border nodes of a level 1 intermediate system-intermediate system (IS-IS) area of the network device, the method comprising the steps of: selecting a next next-hop for the default route; looking up a corresponding border node for the selected next-hop in a local routing information base (RIB) of the network device; selecting a next next-hop of the corresponding border node; checking, by the network device, whether the selected next-hop of the corresponding border node is the same as selected next-hop of default route; and assigning, by the network device, an LFA of the selected next-hop of the corresponding border node as LFA of the selected next-hop of the default route.