H3C Technologies H3C MSR 5600 - Manual (Page 19)

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5. Use the debugging ip icmp command on Device A and Device C to verify that they can send and
receive the specific ICMP packets, or use the display ip routing-table command to verify the
connectivity between Device A and Device C.
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 Figure 4 , assume that 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.