R3166-R3206-HP High-End Firewalls System Management and Maintenance Configuration Guide-6PW101

8
System debugging
Introduction to system debugging
The device provides various debugging functions. For the majority of protocols and features supported,
the system provides corresponding debugging information to help users diagnose errors.
The following two switches control the display of debugging information:
• Protocol debugging switch, which controls protocol-specific debugging information.
• Screen output switch, which controls whether to display the debugging information on a certain
screen.
As Figure 4
illustrates, suppose the device can provide debugging for the three modules 1, 2, and 3.
Only when both the protocol debugging switch and the screen output switch are turned on can
debugging information be output on a terminal.
Figure 4 The relationship between the protocol and screen debugging switch
Configuring system debugging
Output of the debugging information may reduce system efficiency. The debugging commands are
usually used by administrators in diagnosing network failure. After completing the debugging, disable
the corresponding debugging function, or use the undo debugging all command to disable all the
debugging functions.
Output of debugging information is related to the configurations of the information center and the
debugging commands of each protocol and functional module. Displaying the debugging information
on a terminal (including console or VTY) is a common way to output debugging information. You can
also output debugging information to other destinations. For more information, see the chapter
“Information center configuration.” By default, you can output debugging information to a terminal by
following these steps: