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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter32 Configuring System Message Logging
Configuring System Message Logging
You can access logged system messages by using the switch command-line interface (CLI) or by saving
them to a properly configured syslog server. The switch software saves syslog messages in an internal
buffer on a standalone switch, and in the case of a switch stack, on the stack master. If a standalone
switch or the stack master fails, the log is lost unless you had saved it to flash memory.
You can remotely monitor system messages by viewing the logs on a syslog server or by accessing the
switch through Telnet, through the console port, or through the Ethern et management port. In a switch
stack, all stack member consoles provide the same console out put.
Configuring System Message Logging
These sections contain this configuration information:
•System Log Message Format, page 32-2
•Default System Message Logging Configuration, page 32-4
•Disabling Message Logging, page 32-4 (optional)
•Setting the Message Display Destination Device, page 32-5 (optional)
•Synchronizing Log Messages, page 32-6 (optional)
•Enabling and Disabling Time Stamps on Log Messages, page 32-8 (optional)
•Enabling and Disabling Sequence Numbers in Log Messages, page 32-8 (optional)
•Defining the Message Severity Level, page 32-9 (optional)
•Limiting Syslog Messages Sent to the History Table and to SNMP, page 32-10 (optional)
•Enabling the Configuration-Change Logger, page 32-11 (optional)
•Configuring UNIX Syslog Servers, page 32-12 (optional)

System Log Message Format

System log messages can contain up to 80 characters a nd a percent sign (%), which follows the optional
sequence number or time-stamp information, if configured. Messages appear in this form at:
For Catalyst 3750-E switches, seq no:timestamp: %facility-severity-MNEMONIC:description
(hostname-n)
For Catalyst 3560-E switches, seq no:timestamp: %facility-severity-MNEMONIC:description
The part of the message preceding the percent sign depends on the setting of the service
sequence-numbers, service timestamps log datetime, service timestamps log datetime [localtime]
[msec] [show-timezone], or service timestamps log uptime global configuration command.