Allied Telesis AT-S39 - Manual (Page 311)

AT-S39 User’s Guide
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queries the next TACACS+ server in the list. If there aren’t
any more servers, than the switch will default to the
standard Manager and Operator accounts. The default is
30 seconds. The range is 1 to 30 seconds.
IP Address, Port #, and Encryption Key
Use these fields to specify the IP address, UDP port
number, and encryption key of each RADIUS server. You
can specify up to a maximum of three servers. You can
leave the encryption field blank if you entered the server’s
key in the Global Secret field.
c. After you have finished configuring the parameters, click Apply.