How do you check for excessive broadcast traffic on a Cisco switch? Learn why the “show interfaces” command is essential for diagnosing broadcast storms—key knowledge for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
A technician is diagnosing a network performance issue and suspects a broadcast storm. What command should be used to verify excessive broadcast traffic on a Cisco switch?
A. show interfaces
B. show mac address-table
C. show spanning-tree
D. show ip route
E. show arp
Answer
A. show interfaces
Explanation
The show interfaces command provides details about the interface, including excessive broadcasts, errors, and packet statistics.
The command used to verify excessive broadcast traffic on a Cisco switch is show interfaces.
- The show interfaces command provides detailed statistics for each interface, including the number of broadcast packets received and transmitted.
- By examining the broadcast counters in the output, you can identify interfaces experiencing unusually high levels of broadcast traffic, which is a key indicator of a broadcast storm.
- For more targeted analysis, you can clear the counters with clear counters and then use show interfaces again after a short interval to measure the broadcast rate over time.
- This approach allows you to pinpoint the affected interface and take corrective action, such as investigating connected devices or configuring storm control.
The show interfaces command displays per-interface statistics, including the count of broadcast packets, making it the primary tool for detecting and diagnosing excessive broadcast traffic on Cisco switches.
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