How do you verify OSPF neighbor relationships on a Cisco router? Learn why the “show ip ospf neighbor” command is essential for diagnosing OSPF adjacency issues—key knowledge for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
A router is not learning routes from an OSPF neighbor. What command should be used to verify OSPF neighbor relationships?
A. show ip ospf
B. show ip route
C. show running-config
D. show cdp neighbors
E. show ip ospf neighbor
Answer
E. show ip ospf neighbor
Explanation
This command displays OSPF neighbor status, helping identify adjacency issues.
The command to verify OSPF neighbor relationships on a Cisco router is show ip ospf neighbor.
- The show ip ospf neighbor command displays the current OSPF neighbor table, showing critical information such as Neighbor ID, priority, state (e.g., FULL, 2WAY), dead time, neighbor IP address, and the local interface used for the adjacency.
- This information helps determine if OSPF adjacencies have formed correctly. If a neighbor is missing or not in the FULL state, it indicates an adjacency issue, which can prevent route exchange between routers.
- The command output is essential for troubleshooting OSPF because it pinpoints where the neighbor relationship process is failing—whether due to mismatched parameters, network connectivity, or OSPF configuration errors.
show ip ospf neighbor provides a real-time view of OSPF neighbor relationships, allowing technicians to quickly identify and resolve adjacency problems that prevent route learning.
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