6
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 that there
is a route from Device A to 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
, 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
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