TP-Link T2600G-28TS Reference Manual page 414

auth-port port-id —— Specify the UDP destination port for authentication
requests. By default it is 1812.
acct-port port-id —— Specify the UDP destination port for accouting requests.
By deault it is 1813.
time —— Specify the time in seconds the switch waits for the server's response
before it times out. The time ranges from 1 to 9 seconds. The default is 5
seconds.
number —— Specify the number of times a RADIUS request is resent to a
server if the server is not responding in time. By default it is 2 times.
[ 0 ] string | 7 encrypted-string —— 0 and 7 are the encryption type. 0 indicates
that an unencrypted key will follow. 7 indicates that a symmetric encrypted key
with a fixed length will follow. By default, the encryption type is 0. "string" is the
shared key for the switch and the authentication servers to exchange messages
which contains 31 characters at most. The question marks and spaces are not
allowed. "encrypted-string" is a symmetric encrypted key with a fixed length,
which you can copy from another switch's configuration file. The key or
encrypted-key you configured here will be displayed in the encrypted form.
Always configure the key as the last item of this command.
Command Mode
Global Configuration Mode
Privilege Requirement
Only Admin level users have access to these commands.
User Guidelines
The RADIUS servers you configured are added in the server group "radius" by
default.
Example
Configure a RADIUS server with the IP address as 1.1.1.1, authentication port
as 1200, timeout as 6 seconds, retransmit times as 3, and the unencrypted key
string as 12345.
T2600G-28TS(config)# radius-server host 1.1.1.1 auth-port 1200 timeout 6
retransmit 3 key 12345
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