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### Instruction:
What is the purpose of the 'mpls traffic-eng fast-reroute protect' command in IOS XR?
### Response:
The 'mpls traffic-eng fast-reroute protect' command is used to enable MPLS TE Fast Reroute (FRR) protection for a specific interface. When enabled, this interface can be used as a backup tunnel for protecting primary TE tunnels. FRR provides rapid traffic recovery in case of link or node failures by locally repairing the LSPs at the point of failure.
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