Inverse-arp

frame-relay scenario 1
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R6:
interface Serial0/0
   encapsulation frame-relay
   ip address x.x.x.x y.y.y.y

by default, frame-relay inverse-arp will be on. To confirm, check:
    show frame-relay map

To clear inverse-arp:
    clear inarp

To make sure PVC is active,
    show frame-relay pvc