What command is used to determine if a routing protocol relationship has been established with an adjacent router?

The command that confirms whether a routing protocol relationship has been established with an adjacent router is "show ip ospf neighbor." This command provides detailed information about the OSPF (Open Shortest Path First) neighbors that the router has discovered. It displays various important attributes such as the state of the neighbor relationship, the timer settings, and the router IDs of the adjacent routers.

When you utilize this command, you can assess whether OSPF neighbors have formed an adjacency, which is crucial for the OSPF protocol to function correctly. The establishment of neighbor relationships allows routers to exchange OSPF routing information and updates, enabling a coherent view of the network.

Overall, using this command is essential for troubleshooting OSPF connectivity issues and ensuring that the OSPF process is correctly configured and operational on the network. This deeper understanding of neighbor relationships is vital for effective network configuration and maintenance.