Troubleshooting Guide

Procedure
1. Enter Privileged EXEC mode:
enable
2. Use the following trace command to begin the trace operation for additional information
related to Layer 2 querier:
trace level 23 <1-4>
3. Stop tracing:
trace shutdown
4. View the trace results:
trace screen enable
5. View trace saved to a file:
show trace file [tail]
Variable definitions
Use the data in the following table to use the trace command.
Variable Value
level [<0–234][<1–4>] Starts the trace by specifying the module ID and
level. <0-234> specifies the module ID. Module ID 23
represents the IGMP module
<0-4> specifies the trace level:
• 0 — Disabled
• 1 — Very terse
• 2 — Terse
• 3 — Verbose
• 4 — Very verbose
shutdown Stops the trace operation.
screen {disable|enable} Enables or disables the display of trace output to the
screen.
Important:
Avoid using the screen to view commands if you
use trace level 3 (verbose) or trace level 4 (very
verbose) due to the volume of information
generated and the effect on the system.
Use the data in the following table to use the show trace command.
Multicast troubleshooting
January 2017 Troubleshooting 264
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