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-15, 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
• IPv4 routing events
• LLDP events
• OSPF events
• SSH events
• VRRP events
• Wireless Services 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-52 and “Configuring a
Syslog Server” on page C-55.
C-41
