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TP-LINK(config)# radius accounting secondary-ip 10.20.1.101 
radius accounting port 
Description 
The  radius accounting port command is used to set the UDP port of 
accounting server(s). To restore to the default value, please use no radius 
accounting port. 
Syntax 
radius accounting port port-num 
no radius accounting port 
Parameter 
port-num ——The UDP port of accounting server(s) ranging from 1 to 65535. 
The default port is 1813. 
Command Mode 
Global Configuration Mode 
Example 
Set the UDP port of accounting server(s) as 1816: 
TP-LINK(config)# radius accounting port 1816 
radius accounting key 
Description 
The radius accounting key command is used to configure the shared 
password for the switch and the accounting servers to exchange messages.To 
clear the shared password for the switch and the accounting servers, please 
use no radius accounting key command. 
Syntax 
radius accounting key key-string 
no radius accounting key 
Parameter 
key-string ——The shared password for the switch and the accounting servers 
to exchange messages which contains 15 characters at most.