Each path can be locally protected through the network using LFA, remote LFA, or TI-LFA next hop whenever possible. The protection of a node SID reuses the LFA and remote LFA features introduced with SR shortest path tunnels. The protection of an adjacency SID has been added to the 7705 SAR in the specific context of an SR-TE LSP to augment the protection level. The user must enable the LFA, remote LFA, or TI-LFA option in IS-IS or OSPF.
This behavior is supported in the SR shortest path tunnel feature at both the LER and LSR. An SR-TE LSP that transits at an LSR and that matches the ILM of a downstream node SID automatically takes advantage of this protection when enabled. If required, node SID protection can be disabled under the IGP instance by excluding the prefix of the SID node from LFA.