What command displays the current OSPF neighbor relationships on a Cisco router?

The command "show ip ospf neighbors" is used to display the current OSPF (Open Shortest Path First) neighbor relationships on a Cisco router. OSPF relies on establishing adjacencies between routers to exchange routing information, and this command provides crucial details such as the state of the neighbor relationships, the router IDs of the neighbors, and their IP addresses.

When executed, this command reveals a summary of the OSPF neighbors, including their current status—whether they are in a full state, which indicates they have successfully exchanged routing information and are fully adjacent. Additionally, it shows the priority and dead interval settings, which are essential for understanding how OSPF elects designated routers and maintains relationships. This command is fundamental for troubleshooting OSPF connectivity issues and ensuring that routing information is being shared effectively among routers in an OSPF network.

The other commands listed do not serve the same purpose. For example, "show ip route ospf" focuses on displaying the routing table specifically for OSPF learned routes, while "show ospf status" and "show ip routing ospf" do not exist as valid commands in Cisco IOS, highlighting the specificity required in command syntax within the OSPF context.