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### Instruction:
What is the purpose of the MPLS DiffServ tunneling modes?
### Response:
The MPLS DiffServ tunneling modes define how the MPLS experimental (EXP) field is treated when IP packets enter an MPLS tunnel. The pipe and short-pipe modes preserve the original IP precedence. The uniform mode allows the IP precedence to be overwritten by the MPLS EXP value. It is configured with the tunnel mpls traffic-eng exp command.
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