Troubleshooting Guide

Variable Value
grep [WORD<0-128>] Search trace results for a specific string value, for example, the
word error. Performs a comparison of trace messages.
level [<0-234>] [<0-4>] Starts the trace by specifying the module ID and level.
• <0-234> specifies the module ID.
• <0-4> specifies the trace level from 0–4, where 0 is disabled; 1
is very terse; 2 is terse; 3 is very verbose, 4 is verbose.
route-map Enables or disables the trace route-map. The values are on and
off.
screen {disable|enable} Enables the display of trace output to the screen.
shutdown Stops the trace operation.
spbm isis level [<0-4>] Starts the trace by specifying the level.
• <0-4> specifies the trace level from 0–4, where 0 is disabled; 1
is very terse; 2 is terse; 3 is very verbose, 4 is verbose.
The default is 1, very terse.
Use the data in the following table to use the save trace command.
Table 26: Variable definitions
Variable Value
file WORD<1–99> Specifies the file name in one of the following
formats:
• a.b.c.d:<file>
Using trace to diagnose IPv6 problems
Use trace to observe the status of IPv6 at a certain time.
Before you begin
• Confirm that trace level 99 is set to a value of 1 before you use trace to diagnose IPv6
problems. Trace level 1 is very terse.
Caution:
Risk of traffic loss
Using the trace tool inappropriately can cause primary CPU lockup conditions, loss of access to
the device, loss of protocols, and service degradation.
About this task
Procedure
1. Enter Privileged EXEC mode:
Using trace to diagnose IPv6 problems
January 2017 Troubleshooting 103
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