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### Instruction:
How to define the configuration register boot value in Cisco IOS XR?
### Response:
To define the configuration register boot value, which determines how the router functions during initialization, use the 'config-register' command in administration EXEC mode. RP/0/RSP0/CPU0:router#admin
RP/0/RSP0/CPU0:router(admin)#config-register 0x2
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