Why does not an S series switch advertise IGP shortcuts and Forwarding Adjacency to the tunnel interface

Question: Why the IGP shortcuts and Forwarding Adjacency are not advertised to the tunnel interface?

Answer: Perform the following operations on the S series switch to solve the problem.
Ensure that the enable traffic-adjustment [ advertise ] command is configured.
Ensure that OSPF supports tunnel traffic adjustment.
Ensure that the metric type and metric value are configured on the tunnel as required.
Ensure that the MPLS TE is correctly configured on the tunnel interface.

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