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Three routers form a triangle, with a direct link and an alternate path.
Use OSPF to establish IP reachability before adding segment routing.
Enable segment routing for OSPF and configure the same global label block.
Map each loopback prefix to its own segment identifier.
Check the forwarding table for the destination label and direct next hop.
Shut down the direct link so OSPF selects the path through the transit router.
The destination label stays the same, while the outgoing interface changes.
Use an IP ping to check loopback reachability through the alternate path.
Shut down the remaining link and verify that the route and label are withdrawn.
The remote loopback no longer responds while both paths are down.
Restore the links and verify that the direct next hop and reachability return.
Save the configuration after checking the restored path.