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The complete configuration:
radius server 188.8.131.52 authentication-port 1645 auth-primary source loopback0
radius shared-key test
aaa authentication-scheme login default radius local
ip address 184.108.40.206 255.255.255.255
user-interface vty 0 4
authentication-mode scheme default
The following explains each command and the points for attention:
aaa enable (Enable AAA)
radius server 220.127.116.11 authentication-port 1645 auth-primary source loopback0 (set the IP address of RADIUS server to 18.104.22.168 and the listening port number to 1645; the RADIUS server works as master RADIUS authentication server. Specify the address of loopback0 as the source address of packets sent to RADIUS server).
Note: If the source parameter is not configured, radius server will not return packets. You can find code=1 request (as follows) in the packets from NE40, but radius will not respond to it.
*3.1490195263 HS_YD_XDY_NE40_A AAA/8/Packet:send radius packet to
code=1 id=27 length=93
radius shared-key test (it is to configure the key of RADIUS server, which helps encrypt the user password and generate Response Authenticator).
Note: The key must agree with the one set for RADIUS server.
aaa authentication-scheme login default radius local (configure the default authentication plan of Login: RADIUS server authentication first, and then local authentication if no response).