R1 show ip ospf interface fastethernet0/0 R2 debug ip ospf hello R1 conf t interface fastethernet0/0 ip ospf priority 0 ! show ip ospf interface fastethernet0/0 R2 un all show ip ospf interface fastethernet0/0 ! conf t interface fastethernet0/0 ip ospf priority 255 ! show ip ospf interface fastethernet0/0