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C-41
Troubleshooting
Debug/Syslog Operation
Debug/Syslog Operation
While the Event Log records switch-level progress, status, and warning
messages on the switch, the Debug/System Logging (
Syslog
) feature provides
a way to record Event Log and debug messages on a remote device. For
example, you can send messages about routing misconfigurations and other
network protocol details to an external device, and later use them to debug
network-level problems.
Debug/Syslog Messaging
The Debug/Syslog feature allows you to specify the types of Event Log and
debug messages that you want to send to an external device. As shown in
Figure C-12, you can perform the following operations:
■
Use the
debug
command to configure messaging reports for the following
event types:
•
ACL “deny” matches
•
Dynamic ARP protection events
•
DHCP snooping events
•
Events recorded in the switch’s Event Log
•
IP routing events
•
LLDP events
■
Use the
logging
command to select a subset of Event Log messages to send
to an external device for debugging purposes according to:
•
Severity level
•
System module
Debug/Syslog Destination Devices
To use Debug/Syslog messaging, you must configure an external device as the
logging destination by using the
logging
and
debug destination
commands. For
more information, see “Debug Destinations” on page C-51 and “Configuring a
Syslog Server” on page C-53.
A Debug/Syslog destination device can be a Syslog server and/or a console
session. You can configure debug and logging messages to be sent to:
■
Up to six Syslog servers
■
A CLI session through a direct RS-232 console connection, or a Telnet or
SSH session
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