Techniques presented herein provide for the ability to improve Topology Independent Loop-Free Alternate Fast Re-route (TI-LFA) with node protection by embedding backup path information (on a per segment basis) in a stack itself. In particular, techniques herein introduce a Node protected Prefix/Adjacency Segment Identifier (NP-SID) with a new (yet simple) forwarding semantic that can be used to embed backup path information directly in a segment stack. The NP-SID is always followed by the backup node information in the segment stack and the forwarding semantic to the NP-SID will involve a lookup on the backup information only if a protected node fails. The techniques may provide a benefit of being purely stateless by not involving context tables on nodes.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.