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Chapter27 Configuring System Message Logging
Configuring System Message Logging
Configuring System Message Logging
These sections describe how to configure system message loggin g:
•System Log Message Format, page 27-2
•Default System Message Logging Configuration, page 27-3
•Disabling and Enabling Message Logging, page 27-4
•Setting the Message Display Destination Device, page 27-4
•Synchronizing Log Messages, page 27-6
•Enabling and Disabling Timestamps on Log Messages, page 27-7
•Enabling and Disabling Sequence Numbers in Log Messages, page 27-8
•Defining the Message Severity Level, page 27-8
•Limiting Syslog Messages Sent to the History Table and to SNMP, page 27-10
•Configuring UNIX Syslog Servers, page 27-11

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 timestamp information, if configured. Messages appear in this format:
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.
Table27-1 describes the elemen ts of syslog messag es.
Table27-1 System Log Message Elements
Element Description
seq no: Stamps log messages with a sequence number only if the service sequence-numbers global
configuration command is configured.
For more information, see the “Enabling and Disabling Sequence N um be rs in L og M ess ag es ”
section on page 27-8.
timestamp formats:
mm/dd hh:mm:ss
or
hh:mm:ss (short uptime)
or
d h (long uptime)
Date and time of the message or event. This information appears only if the service timestamps
log [datetime | log] global configuration command is configured.
For more information, see the “Enabling and Disabling Timestamps on Log Messages” section on
page 27-7.
facility The facility to which the message refers (for example, SNMP, SYS, and so forth). For a list of
supported facilities, see Table27-4 on page 27-12.
severity Single-digit code from 0 to 7 that is the severity of the message. For a descr ipti on of th e severity
levels, see Table27-3 on page 27-9.