Which command is used to view OSPF neighbor relationships on a Cisco router?

The command used to view OSPF (Open Shortest Path First) neighbor relationships on a Cisco router is "show ip ospf neighbor." This command provides a detailed view of the OSPF neighbors, including their state, router ID, address, and the OSPF interface through which the neighbor relationship has been established. It helps network administrators troubleshoot and monitor OSPF operations by allowing them to see which routers are successfully communicating with each other and identifying any potential issues in the OSPF adjacency.

Understanding OSPF neighbor relationships is crucial because OSPF relies on these relationships to discover and maintain routes within an Autonomous System (AS). By using this command, you can ensure that OSPF is functioning correctly and that your routing topology is stable.