User`s guide

AT-S39 Command Line Interface User’s Guide
147
The following command selects TACACS+ as the authentication
protocol with a global encryption key of tiger54:
set authentication method=tacacs secret=tiger54
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