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### Instruction:
How to configure an IPv4 address on an interface?
### Response:
To configure an IPv4 address on an interface in Cisco IOS XR, use the 'ipv4 address' command in interface configuration mode. RP/0/RP0/CPU0:router(config)#interface GigabitEthernet0/0/0/0
RP/0/RP0/CPU0:router(config-if)#ipv4 address 192.168.1.1 255.255.255.0
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