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

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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.

Other related questions:
Why does not an S series switch functioning as an ABR summarize addresses while advertising the routes
Perform the following operations on the S series switch functioning as the ABR to solve the problem. Run the display current configuration command to check whether all network segments in the area are consecutive. If not, divide the network segments into several groups of consecutive network segments. Run the abr-summary command on the ABR to summarize each group of consecutive network segments into one network segment. Check the filter export command in the area view and ensure that the LSA for ABR route summarization is not filtered out.

What are the differences in AP-side switch interface configuration and intermediate switch configuration in direct and tunnel forwarding modes
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Why does not the MTU configuration take effect on tunnel interfaces of a switch
The maximum transmission unit (MTU) configuration is valid for packets sent to and from the control plane, but invalid for packets directly forwarded by hardware. To limit the size of packets forwarded by hardware, configure the MTU on physical interfaces.

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