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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 17 Configuring System Message Logging
Configuring System Message Logging
Limiting Syslog Messages Sent to the History Table and to SNMP
If you have enabled syslog message traps to be sent to an SNMP network management station by using
the snmp-server enable trap global configuration command, you can change the level of messages sent
and stored in the switch history table. You can also change the number of messages that are stored in the
history table.
Messages are stored in the history table because SNMP traps are not guaranteed to reach their
destination. By default, one message of the level warning and numerically lower levels (see
Table 17-3
on page 17-9
) are stored in the history table even if syslog traps are not enabled.
Beginning in privileged EXEC mode, follow these steps to change the level and history table size
defaults:
When the history table is full (it contains the maximum number of message entries specified with the
logging history size global configuration command), the oldest message entry is deleted from the table
to allow the new message entry to be stored.
To return the logging of syslog messages to the default level, use the no logging history global
configuration command. To return the number of messages in the history table to the default value, use
the no logging history size global configuration command.
Configuring UNIX Syslog Servers
The next sections describe how to configure the UNIX server syslog daemon and define the UNIX
system logging facility.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
logging history level
1
1.
Table 17-3
lists the level keywords and severity level. For SNMP usage, the severity level values increase by 1. For example, emergencies
equal 1, not 0, and critical equals 3, not 2.
Change the default level of syslog messages stored in the history file and
sent to the SNMP server.
See
Table 17-3 on page 17-9
for a list of level keywords.
By default, warnings, errors, critical, alerts, and emergencies messages
are sent.
Step 3
logging history size number
Specify the number of syslog messages that can be stored in the history
table.
The default is to store one message. The range is 1 to 500 messages.
Step 4
end
Return to privileged EXEC mode.
Step 5
show running-config
Verify your entries.
Step 6
copy running-config startup-config
(Optional) Save your entries in the configuration file.
