300-410 Question 268
Select 3A network engineer is troubleshooting intermittent issues with OSPF neighbor adjacencies in a branch office. They decide to enable logging and use conditional debugging to isolate the issue. Which of the following steps should the engineer take to effectively troubleshoot the problem?
- A
Enable logging timestamps to correlate events.
- B
Use the 'debug ip ospf events' command to capture all OSPF-related activity.
- C
Configure an access control list (ACL) to filter specific IP traffic and apply it to the debugging.
- D
Use the 'debug condition interface
' command to limit debugging to the affected interface. - E
Set the logging level to 'critical' to avoid excessive log messages.
Show answer and explanation
Correct answers: A, C, D
Explanation
When troubleshooting a specific issue like OSPF neighbor adjacency problems, it is essential to use focused tools and methods to avoid excessive or irrelevant output. Enabling logging timestamps helps correlate events with specific problems. Using an ACL to filter relevant traffic and applying conditional debugging to the affected interface ensures that the debugging output is manageable and targeted. Setting the logging level too high or using generic debug commands without filtering could overwhelm the engineer with unnecessary information.
- A. Correct.
Enabling logging timestamps is crucial for correlating log messages with network events, especially when troubleshooting intermittent issues.
- B. Incorrect.
While 'debug ip ospf events' captures OSPF-related activity, it generates excessive output and is not filtered to the specific issue. This could make troubleshooting more difficult.
- C. Correct.
Using an ACL to filter specific IP traffic helps narrow down the debugging to relevant traffic, making the output more manageable and focused.
- D. Correct.
The 'debug condition interface
' command helps limit debugging output to only the affected interface, reducing noise and isolating the issue. - E. Incorrect.
Setting the logging level to 'critical' might suppress useful debugging messages required for troubleshooting OSPF neighbor adjacency issues.