Allied Telesis AT-S63 - Manual (Page 659)

AT-S63 Management Software Command Line Interface User’s Guide
Section VIII: Management Security 659
The following command selects RADIUS as the authentication protocol
with a global encryption key of leopard09 and a timeout of 15 seconds:
set authentication method=radius secret=leopard09 timeout=15
The following command removes the current global secret from the
RADIUS client without assigning a new value:
set authentication method=radius secret=none