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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 23 Configuring System Message Logging
Configur ing System Mes sage Loggin g

Configuring Sy stem Me ssage Logging

These sec ti ons de scr ibe how to c on figure s ystem m es sag e loggi n g:
•System Log Me ssage Format, page 23-2
•Default Syste m Message Logg ing Configurat ion, page 23-3
•Disabling a nd E nab lin g Messa ge L ogg ing, page 2 3-4
•Setting the Message Display Destination Device, page 23-4
•Synchroniz ing Log Me ssages, page 23-6
•Enab ling and Disab ling Timestamps on Log Me ssages, pa ge 23-7
•Enabling and Disabling Sequence Numbers in Log Messages, page 23-8
•Defining the Me ssag e Severity Level, page 23 -8
•Limiting Sy slog Messa ges Se nt to the Hi stor y Table a nd t o SNM P, page 23-10
•Configuring U NIX Sysl og Ser vers, page 2 3-10

System Log Message Format

System log messages can contain up to 80 characters and a percent sign (%), which follows the optional
sequenc e number or timestam p informat ion, if configured . Messa ges are display ed in this form at:
seq no:timestamp: %facility-severity-MNEMONIC:description
The part of the message preceding the percent sign depe nds on the settin g of the service
sequence-numbers, service timestamp s log dateti me, service timestamps log datetime [ localtime]
[msec] [show-timezone], or service timestamps log uptime global configurati on comm and.
Table 23-1 describes the elem ents of syslog me ssages.
Table 23-1 System Log Message Elements
Element Description
seq no: Stamps log me ssage s wit h a s equ en ce num be r onl y if th e service sequence-numbers glob al
configuration c om mand is con figured.
For more inf orma tion, see th e “Enabl ing a nd Di sab lin g Se qu en ce Num be rs i n L og Mes s ag es”
section on page 23-8.
timestamp formats:
mm/dd hh:mm:ss
or
hh:mm:ss (shor t up tim e)
or
d h (long upti me)
Date and time of the message or event. This information appears only if the service timestamps
log [datetime | log] glo ba l c onfigurati on com mand i s configu red.
For more information, see the “Enabling and Disabling Timestamps on Log Messages” section o n
page 23-7.
facility The facility t o which t he message re fers (fo r example, SNMP, SYS, and so fort h). For a list of
supported facilities, see Ta ble 23-4 on page 23-12.
severity Single-dig it co de from 0 to 7 t hat is t he severity of the messa ge. For a de scri pti on of th e severity
levels, see Tab le 23-3 on pag e 23-9.