Radius Authentication Example - Dell Networking N4000 Series Configuration Manual

Authenticating Without a Public Key
When authenticating without the public key, the switch prompts for the user
name and password. This is a SSH function, not a switch function. If the user
knows the administrator login and password, then they are able to
authenticate in this manner.

RADIUS Authentication Example

Use the following configuration to require RADIUS authentication to login
over a Telnet connection:
aaa authentication login "rad" radius
aaa authentication enable "raden" radius
radius-server host 1.2.3.4
key "secret"
exit
line telnet
login authentication rad
enable authentication raden
exit
The following describes each line in the above configuration:
225
Configuring Authentication, Authorization, and Accounting