The ip ospf passive-interface command is used to prevent OSPF adjacency and routing updates from being sent or received on a specific interface, while still advertising the interface subnet via OSPF. This command is useful for stub networks or loopback interfaces that do not need to form OSPF neighbor relationships. The other commands either enable OSPF adjacency by default, change the OSPF network type, or disable OSPF passive mode. References: * Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide, Release 9.3(x) - Configuring OSPF [Cisco Nexus 9000 Series Switches], Configuring OSPF, Configuring OSPF Interfaces * Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide, Release 9.3(x) - Configuring OSPF [Cisco Nexus 9000 Series Switches], Configuring OSPF, Configuring OSPF Passive Interfaces * Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide, Release 9.3(x) - Configuring OSPF [Cisco Nexus 9000 Series Switches], Configuring OSPF, Configuring OSPF Network Types