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Cisco Certified Network Associate (CCNA) · Cisco
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Two basics ways to enable OSPFv2 in an active interface are: 1) OSPFv2 Traditional configuration: R1(config)# router ospf <process-id> R1(config-router)# network <network-adddress> <wildcard-mask> area <area-number> 2) OSPv2 Interface configuration: R1(config)# interface gigabitEthernet 0/0 R1(config-router)# ip ospf <process-if> area <area-number> Where: R1 is the hostname of the router. As you can see, the "process-id" and the "area-number" are necessary parameters in both configurations, including the quad-zero configuration that is similar to the "Traditional" way.
The trick is that you need the Process ID to configure OSPF but for routers to become neighbors it is not needed. IPV4 is OSPF V2
Key word is "enable", this is not pertaining to adjacency with neighbors.