R1

show ip ospf neighbor

debug ip ospf events

conf t
router ospf 1
 network 12.12.12.1 0.0.0.0 area 2


R2

conf t
router ospf 2
 network 12.12.12.0 0.0.0.255 area 2




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R4

conf t
router ospf 4
 network 24.24.24.4 0.0.0.0 area 0


R2

inter fastethernet 1/0
 ip ospf 2 area 0


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R1

show ip ospf neighbor

R2

show ip ospf neighbor