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### Instruction:
What is the purpose of the 'allocate global' sub-command under 'mpls label range'?
### Response:
The 'allocate global' sub-command is used to allocate labels from the global label pool. By default, IOS XR uses per-interface label space. The 'allocate global' command switches the label allocation to use the global label space, which is required for some MPLS applications such as L3VPN and MPLS TE.
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