300-510 · Question #13
Which output from the show isis interface command helps an engineer troubleshoot an IS-IS adjacency problem on a Cisco IOS-XR platform?
The correct answer is C. circuit type. The circuit type field in 'show isis interface' reveals whether an interface is operating as Level-1 only, Level-2 only, or Level-1-2. A mismatch in circuit types is a very common cause of IS-IS adjacency failures: if one router's interface is Level-1 only and the peer is…
Question
Which output from the show isis interface command helps an engineer troubleshoot an IS-IS adjacency problem on a Cisco IOS-XR platform?
Options
- Ametric
- Bpriority
- Ccircuit type
- Dhello interval
How the community answered
(42 responses)- B2% (1)
- C93% (39)
- D5% (2)
Explanation
The circuit type field in 'show isis interface' reveals whether an interface is operating as Level-1 only, Level-2 only, or Level-1-2. A mismatch in circuit types is a very common cause of IS-IS adjacency failures: if one router's interface is Level-1 only and the peer is Level-2 only, they will never form an adjacency because they have no common level to operate on. While metric, priority, and hello interval are visible in the same output, they rarely block adjacency formation; mismatched circuit type is the most definitive adjacency-breaking indicator.
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