Allied Telesis AT-S21 - Manual (Page 19)

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To set your switch to the factory defaults, do the following:
Warning
This operation deletes existing switch configurations.
1. Attach a terminal to the RS232 port located on the front panel of
the switch and begin the terminal emulation program.
2. Press located on the right side of the switch’s front panel.
3. Immediately press any key when you see Hit any key to run
diagnostics or to reload system software . A menu
then displays.
4. Select D from the menu. The following warning message displays:
WARNING: This will erase all current
configuration data!
Continue? Y/N
5. Select Y .
The system displays: All configuration data has
been reset to factory default values .
Press to boot the switch software