Avocent CCM4850 Managing the Port History Buffer, Using port history mode commands

26CCM4850 Installer/User Guide

To enable or disable security lock-out:

1.To enable security lock-out, issue a Server Security command, using the Lockout parameter with a value between 1-99.

2.To disable security lock-out, issue a Server Security command, using the Lockout=0 parameter.

To unlock a locked-out user:

Issue a User Unlock command with the username.

Managing the Port History Buffer

Each CCM appliance serial port has a circular history buffer that contains the latest 64K bytes of data received from the attached serial device. This information may be helpful in analyzing attached device anomalies.

The history buffer begins filling with received data upon completion of CCM appliance initialization, even if no user is connected. When you connect to a serial port, the data that was received from the attached serial device prior to the connection is available in the buffer. Once online, new data continues to be stored in the buffer. You may choose whether to display the history buffer’s content automatically when you connect and whether to keep or discard the history buffer’s content at the end of a session.

When more than 64K bytes of data are sent to the history buffer, data at the top of the buffer is discarded to make room for the new data. As a result, the buffer always contains the most recent 64K bytes of port history.

Using port history mode commands

Once you are in port history mode, you may issue the commands listed in Table 3.5. Only the first letter of the command is required.

Table 3.5: Port History Mode Commands

Command Description

Bottom	B sets the view location to the bottom of the file minus 23 history display lines, if available.
Clear	C clears the port history buffer.
Next	N increments the current history display line by the number of lines per page and outputs a new
	history display page.
Prev	P decrements the current history display line by the number of lines per page and outputs a new
	history display page.
Quit	Q returns to the normal CLI.
Resume	R leaves port history mode and CLI mode and resumes the session with the attached serial
	device. This single command is equivalent to sequentially using the Quit and Resume commands.