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CHAPTER
29-1
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
29
Configuring System Message Logging
This chapter describes how to configure system message logging on the Catalyst 2960 and 2960-S
switches. Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.
Note Stacking is supported only on Catalyst 2960-S switches running the LAN base image.
For complete syntax and usage information for the commands used in this chapter, see the Cisco IOS
Configuration Fundamentals Command Reference, Release 12.2 from the Cisco.com page under
Documentation > Cisco IOS Software > 12.2 Mainline > Command References.
This chapter consists of these sections:
• Understanding System Message Logging, page 29-1
• Configuring System Message Logging, page 29-2
• Displaying the Logging Configuration, page 29-14
Caution Logging messages to the console at a high rate can cause high CPU utilization and adversely affect how
the switch operates.
Understanding System Message Logging
By default, a switch sends the output from system messages and debug privileged EXEC commands to
a logging process. Stack members can trigger system messages. A stack member that generates a system
message appends its hostname in the form of hostname-n, where n is a switch number from 1 to 4, and
redirects the output to the logging process on the stack master. Though the stack master is a stack
member, it does not append its hostname to system messages. The logging process controls the
distribution of logging messages to various destinations, such as the logging buffer, terminal lines, or a
UNIX syslog server, depending on your configuration. The process also sends messages to the console.
Note The syslog format is compatible with 4.3 BSD UNIX.
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. Messages appear on the active consoles after the process that generated them has finished.