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### Instruction:
What is the purpose of the MPLS TE FRR fast tunnel interface down detection feature?
### Response:
The MPLS TE FRR fast tunnel interface down detection feature provides a fast mechanism to detect the loss of the physical interface that is carrying TE backup tunnels. It uses hardware-based event detectors to quickly trigger FRR switching to an alternate backup tunnel or the release of protected resources. This minimizes traffic loss from failures of backup interfaces.
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