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  • Robert Powers thinks this is interesting:

For OSPF, the command works slightly differently, with the show ip ospf interface brief command listing all OSPF-enabled interfaces (including passive interfaces). Using this command, along with the list of passive interfaces listed by the show ip protocols command, again identifies all fully enabled OSPF interfaces as well as all passive interfaces.

Note

Answering routing protocol troubleshooting question #1 - which interfaces are included with the protocol vs which should be included (ospf)