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.
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Nainar, Nagendra Kumar; Raza, Kamran; Pignataro, Carlos M.; and Asati, Rajiv, "EMBEDDED BACKUP PATH INFORMATION FOR STATELESS SRV6 MICRO SEGMENT IDENTIFIER NODE PROTECTION", Technical Disclosure Commons, (December 16, 2020)