D-Link DGS-6600-48T Cli Reference Manual page 537

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Example
.
Switch(config)#aaa group server group1
Switch(config-aaa-groug-server)# server radius 172.19.10.100 auth-port 1500 key 12345678
Switch(config-aaa-group-server)# server radius 172.19.10.100 auth-port 1600 key 12345678
Switch(config-aaa-group-server)# end
Switch(config)#
CLI Reference Guide
dependent. However it is recommended to be 3 and use them as a backup
server scheme.
The encryption key is used to encrypt and authenticate all communication
between the TACACS+/RADIUS client and server. The same key must be
configured on the client and the server.
The following example shows the network access server configured to recognize
two RADIUS host entries. The second host entry configured acts as fail-over
backup to the first one (the RADIUS host entries are tried in the order in which
they are configured).
Verify the settings by entering the show aaa group server command.
server
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