Use Trace to Examine IS-IS Control Packets
Use trace as a debug tool to examine the code flow and Intermediate-System-to-Intermediate-System (IS-IS) control packets.
About this task
The default trace settings for CPU utilization are:
-
High CPU Utilization: 90%
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High Track Duration: 5 seconds
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Low CPU Utilization: 75%
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Low Track Duration: 5 seconds
Procedure
Example
Clear prior trace information, and then enable the display of trace output to the screen. Begin the trace operation for received IS-IS hello packets:
Switch:1#clear trace Switch:1>enable Switch:1#trace screen enable Switch:1#Screen tracing is on Switch:1#trace level 267 2
Variable Definitions
The following table defines parameters for the show trace command.
Variable |
Value |
---|---|
auto |
Displays the current configuration for the automatic trace function. |
file [tail] |
Displays the trace results saved to a file. |
level |
Displays the current trace level for all modules. |
modid-list |
Specifies the module ID list. |
The following table defines parameters for the trace command.
Variable |
Value |
---|---|
grep [WORD<0-128>] |
Specifies the search keyword. You can use a specific MAC address. You can search for errors, using the command, trace grep error. |
level [<Module_ID>] [<0-4>] |
Starts the trace by specifying the module ID and level. <Module_ID> specifies the module for the trace. Different hardware platforms support different IDs because of feature support differences. For feature support information, see Fabric Engine and VOSS Feature Matrix. To see the list of module IDs, use the show trace modid-list command or CLI command completion Help. 0–4 specifies the trace level:
|
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. |
The following table defines parameters for the save trace command.
Variable |
Value |
---|---|
file WORD<1–99> |
Specifies the file name in one of the following formats:
WORD<1–99> is a string of 1–99 characters. Note:
If you do not specify a file name, the file name is systrace.txt. |