6
System debugging
The device supports debugging for the majority of protocols and features, and provides debugging
information to help users diagnose errors.
Debugging information control switches
The following switches control the display of debugging information:
•
Module debugging switch
—Controls whether to generate the module-specific debugging
information.
•
Screen output switch
—Controls whether to display the debugging information on a certain
screen. Use
terminal monitor
and
terminal logging level
commands to turn on the screen
output switch. For more information about these two commands, see
Network Management
and Monitoring Command Reference
.
As shown in
, the device can provide debugging for the three modules 1, 2, and 3. The
debugging information can be output on a terminal only when both the module debugging switch and
the screen output switch are turned on.
Debugging information is typically displayed on a console. You can also send debugging information
to other destinations. For more information, see "
Configuring the information center
Figure 4 Relationship between the module and screen output switch
Debugging a feature module
Output of debugging commands is memory intensive. To guarantee system performance, enable
debugging only for modules that are in an exceptional condition. When debugging is complete, use
the
undo debugging all
command to disable all the debugging functions.
To debug a feature module:
Step
Command
Remarks
1.
Enable debugging for a
module in user view.
debugging
module-name
[
option
]
By default, all debugging
functions are disabled.
1
3
1
2
3
1
3
1
3
Debugging
information
Protocol
debugging
switch
Screen
output switch
Debugging
information
Protocol
debugging
switch
Screen
output switch
ON
OFF
ON
OFF
1
2
3
ON
OFF
ON
ON
