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.
- Chapter 11. Troubleshooting IPv4 Routing Protocols
- from Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide
- Publisher: Cisco Press
- Released: May 2013
Answering routing protocol troubleshooting question #1 - which interfaces are included with the protocol vs which should be included (ospf)
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