System Message Logging
Configure event notification via IOS CLI

Message logging is enabled by default. It must be enabled to send messages to any destination other than the console. When enabled, log messages are sent to a logging process, which logs messages to designated locations asynchronously to the processes that generated the messages. Beginning in configuration mode, follow the steps in Figure to disable message logging. To re-enable message logging after it has been disabled, use the logging on global configuration command.

The logging synchronous global configuration command also affects the display of messages to the console. When this command is enabled, messages appear only after Return is pressed.

If message logging is enabled, messages can be sent to specific locations in addition to the console. Beginning in privileged EXEC mode, use one or more of the following commands to specify the locations that receive messages . Do not make the buffer size too large because the access point could run out of memory for other tasks. Use the show memory privileged EXEC command to view the free processor memory on the access point; however, this value is the maximum available, and the buffer size should not be set to this amount.

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.

By default, log messages are not timestamped. Beginning in configuration mode, follow the steps in Figure to enable timestamping of log messages. Because there is a chance that more than one log message can have the same timestamp, messages can be displayed with sequence numbers so that a single message can be easily found. By default, sequence numbers in log messages are not displayed.

From configuration mode, follow the steps in Figure to enable sequence numbers in log messages.

A sample IOS CLI login configuration is shown in Figure .


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