Cisco Catalyst 4500 Series - Configuring System Message Logging

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex

Chapter 70 Configuring System Message Logging

Configuring System Message Logging

You can remotely monitor system messages by viewing the logs on a syslog server or by accessing the

switch through Telnet or using the console port.

Configuring System Message Logging

These sections describe how to configure system message logging:

• System Log Message Format, page 70-2

• Default System Message Logging Configuration, page 70-3

• Disabling Message Logging, page 70-3

• Setting the Message Display Destination Device, page 70-4

• Synchronizing Log Messages, page 70-5

• Enabling and Disabling Timestamps on Log Messages, page 70-6

• Enabling and Disabling Sequence Numbers in Log Messages (Optional), page 70-7

• Defining the Message Severity Level (Optional), page 70-8

• Limiting Syslog Messages Sent to the History Table and to SNMP (Optional), page 70-9

• Configuring UNIX Syslog Servers, page 70-10

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 are displayed 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] command or the

service timestamps log uptime global configuration command.

Table 70-1 describes the elements of syslog messages.

Table 70-1 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 Numbers in Log Messages

(Optional)” section on page 70-7.

timestamp formats:

mm/dd hh:mm:ss

hh:mm:ss (short uptime)

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 70-6.

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