Troubleshooting guide

A-5
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Appendix
Using the Debug Interface
E04FACB405.00 with ILMI
Switch# no debug lane client all
All possible debugging has been turned off
Switch#
The switch router continues to generate such output until you enter the corresponding no debug
command (in this case, no debug lane client all).
If you enable a debug command and no output is displayed, consider the following possibilities:
• The switch router might not be properly configured to generate the type of traffic you want to
monitor. Use the show running-config command to check the configuration of the switch router.
• Even a properly configured switch router might not generate the type of traffic you want to monitor
when debugging is enabled. Depending on the protocol you are debugging, you can use commands
such as the ping atm interface atm command to generate network traffic.
Redirecting Debugging and Error Message Output
By default, the network server sends the output from debug commands and system error messages to the
console terminal. If you use this default, monitor debugging output with a virtual terminal connection,
rather than the console port.
To redirect debugging output, use the variations of the logging command within configuration mode as
described in the following sections.
Possible destinations include the console terminal, virtual terminals, internal buffer, and UNIX hosts
running a syslog server. The syslog format is compatible with 4.3 Berkeley Standard Distribution (BSD)
UNIX and its derivatives.
Note Be aware that the debugging destination you use affects system overhead. Logging messages to the
console produces very high overhead, whereas logging messages to a virtual terminal produces less
overhead. Logging messages to a syslog server produces even less, and logging them to an internal
buffer produces the least overhead of any method.
To configure message logging, you need to be in configuration command mode. To enter this mode, use
the configure terminal command at the EXEC prompt.