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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 26 Configuring System Message Logging
Configuring System Message Logging
The logging buffered global configuration command copies logging messages to an internal buffer. The
buffer is circular, so newer messages overwrite older messages after the buffer is full. To display the
messages that are logged in the buffer, use the show logging privileged EXEC command. The first
message displayed is the oldest message in the buffer. To clear the contents of the buffer, use the clear
logging privileged EXEC command.
To disable logging to the console, use the no logging console global configuration command. To disable
logging to a file, use the no logging file [severity-level-number | type] global configuration command.
Synchronizing Log Messages
You can configure the system to synchronize unsolicited messages and debug privileged EXEC
command output with solicited device output and prompts for a specific console port line or virtual
terminal line. You can identify the types of messages to be output asynchronously based on the level of
severity. You can also determine the maximum number of buffers for storing asynchronous messages for
the terminal after which messages are dropped.
When synchronous logging of unsolicited messages and debug command output is enabled, unsolicited
device output appears on the console or is printed after solicited device output appears or is printed.
Unsolicited messages and debug command output appears on the console after the prompt for user input
is returned. Therefore, unsolicited messages and debug command output are not interspersed with
solicited device output and prompts. After the unsolicited messages appear, the console again displays
the user prompt.
Step 4 logging file flash:filename
[max-file-size] [min-file-size]
[severity-level-number | type]
Store log messages in a file in flash memory.
• For filename, enter the log message filename.
• (Optional) For max-file-size, specify the maximum logging file size.
The range is 4096 to 2147483647. The default is 4069 bytes.
• (Optional) For min-file-size, specify the minimum logging file size.
The range is 1024 to 2147483647. The default is 2048 bytes.
• (Optional) For severity-level-number | type, specify either the logging
severity level or the logging type. The severity range is 0 to 7. For a
list of logging type keywords, see Table 26-3 on page 26-8. By
default, the log file receives debugging messages and numerically
lower levels.
Step 5 end Return to privileged EXEC mode.
Step 6 terminal monitor Log messages to a nonconsole terminal during the current session.
Terminal parameter-setting commands are set locally and do not remain
in effect after the session has ended. You must perform this step for each
session to see the debugging messages.
Step 7 show running-config Verify your entries.
Step 8 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose