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### Instruction:
How to configure a VRF?
### Response:
To configure a VRF (Virtual Routing and Forwarding) instance, use the 'vrf' command in global configuration mode. RP/0/RP0/CPU0:router(config)#vrf Customer_A
RP/0/RP0/CPU0:router(config-vrf)#address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-vrf-af)#exit
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