H3C Technologies H3C SR8800 - Manual (Page 18)

6
Configuring system debugging
Output of the debugging information may reduce system efficiency. Administrators usually use the
debugging commands to diagnose 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 depends on 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
“Configuring the information center.”
To enable the output of debugging information to a terminal:
Step Command Remarks
1. Enable the terminal
monitoring of system
information.
terminal monitor
Optional.
By default, the terminal monitoring
on the console is enabled and that
on the monitoring terminal is
disabled.
Available in user view.
2. Enable the terminal
display of debugging
information.
terminal debugging
By default, terminal display of
debugging information is
disabled.
Available in user view.
3. Enable debugging for a
specified module. debugging { all [ timeout time ] |
module-name [ option ] }
By default, debugging for a
specified module is disabled.
Available in user view
4. Display the enabled
debugging functions.
display debugging [ interface
interface-type interface-number ]
[ module-name ] [ | { begin | exclude
| include } regular-expression ]
Optional.
Available in any view.
NOTE:
You must configure the debugging, terminal debugging and terminal monitor commands first to display
the detailed debugging information on the terminal. For more information about the terminal debugging
and terminal monitor commands, see Network Management and Monitoring Command Reference.
Ping and tracert configuration example
Network requirements
As shown in Figure 4 , Device A failed to telnet Device C. Check whether Device A and Device C can
reach each other. If they cannot reach each other, locate the failed nodes in the network.