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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring System Message Logging and Smart Logging
Configuring System Message Logging
When the logging process is disabled, messages are sent only to the console. The messages are sent as
they are generated, so message and debug output are interspersed with prompts or output from other
commands. On Catalyst 3750-X switches, messages appear on the active consoles after the process that
generated them has finished. On Catalyst 3560-X switches, messages appear on the console after the
process that generated them has finished.
You can set the severity level of the messages to control the type of messages displayed on the consoles
and each of the destinations. You can time-stamp log messages or set the syslog source address to
enhance real-time debugging and management. For information on possible messages, see the system
message guide for this release.
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 Ethernet management port. In a switch
stack, all stack member consoles provide the same console output.
Configuring System Message Logging
• System Log Message Format, page 1-2
• Default System Message Logging Configuration, page 1-4
• Disabling Message Logging, page 1-4 (optional)
• Setting the Message Display Destination Device, page 1-5 (optional)
• Synchronizing Log Messages, page 1-6 (optional)
• Enabling and Disabling Time Stamps on Log Messages, page 1-8 (optional)
• Enabling and Disabling Sequence Numbers in Log Messages, page 1-8 (optional)
• Defining the Message Severity Level, page 1-9 (optional)
• Limiting Syslog Messages Sent to the History Table and to SNMP, page 1-10 (optional)
• Enabling the Configuration-Change Logger, page 1-11 (optional)
• Configuring UNIX Syslog Servers, page 1-12 (optional)
System Log Message Format
System log messages can contain up to 80 characters and a percent sign (%), which follows the optional
sequence number or time-stamp information, if configured. Messages appear in this format:
For Catalyst 3750-X switches, seq no:timestamp: %facility-severity-MNEMONIC:description
(hostname-n)
For Catalyst 3560-X 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.
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