HP ProCurve 6400cl Series Management And Configuration Manual page 462

Troubleshooting
Debug and Syslog Messaging Operation
C-42
Example: Suppose that there are no Syslog servers configured on the switch
(the default). Configuring one Syslog server enables debug logging to that
server and also enables Event Log messages to be sent to the server.
Figure C-16.Example of Configuring Basic Syslog Operation
Note that after you enable Syslog logging, if you do not want Event Log
messages sent to the Syslog server(s), you can block such messages by
executing no debug event. (This has no effect on standard logging of messages
in the switch's Event Log.)
Displays the default debug
configuration. (There are no Syslog
server IP addresses or debug
types configured.)
When the logging command
configures a Syslog IP address, the
switch automatically enables
debug messaging to the Syslog
address, the user facility on the
Syslog server, and the Event debug
message type.