Allied Telesis AT-S63 - Manual (Page 62)

Chapter 3: Basic Switch Parameters
62 Section I: Basic Operations
3. From the System Utilities menu, type 5 to select Reboot the switch.
The following prompt is displayed:
The switch is about to reboot. Do you want to proceed?
[Yes/No] ->
4. Type Y to reboot the switch or N to cancel the procedure.
Caution
The switch does not forward traffic while it reloads its operating
software, a process that takes approximately 20 seconds to
complete. Some packet traffic may be lost. After the switch finishes
rebooting, you must reestablish your management session if you
want to continue managing the unit.