What happens when a segment-routing TE tunnel loses the link and there is no secondary path in place?
The headend router generates a new path to the tail-end router using bandwidth to determine the best path.
The tail-end router sends an alert to the syslog server that the tunnel and the secondary route are inaccessible.
The headend router starts the invalidation timer to bring the tunnel down.
The headend and tail-end routers revalidate SID hops to determine the proper label stack to reroute the traffic.
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