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radius authentication secondary-ip ip-addr 
no radius authentication secondary-ip 
Parameter 
ip-addr ——The IP address of the alternate authentication server. By default, it 
is 0.0.0.0. 
Command Mode 
Global Configuration Mode   
Example 
Configure the IP address of the alternate authentication server as 10.20.1.101: 
TP-LINK(config)# radius authentication secondary-ip 10.20.1.101 
radius authentication port 
Description 
The radius authendication port command is used to configure the 
authentication port of the alternate authentication server. To restore to the 
default value, please use no radius authendication port command.  
Syntax 
radius authentication port port-num 
no radius authentication port 
Parameter 
port-num ——The UDP port of authentication server(s) raging from 1 to 65535 
and the default port is 1812. 
Command Mode 
Global Configuration Mode 
Example 
Configure the authentication port of the alternate authentication server as 1815: 
TP-LINK(config)# radius authentication port 1815 
radius authentication key 
Description