Strict SPF and IGP shortcut

You can have segment routing algorithm 1 (strict SPF) SIDs advertised in IS-IS LSPDU and use these SIDs to create SR-TE tunnels to forward the traffic by using the shortest IGP path to reach the tunnel endpoint while avoiding loops. You can also specify a set of prefixes in the import policy, based on which the tunnel can redirect the traffic to a certain destination. Additionally, you can use algorithm 1 (strict SPF) along with algorithm 0 (default SPF) by default when Source Packet Routing in Networking (SPRING) is enabled.