Cisco, Dell Authentication for Admins

[brain conflict]

Hello,
Just looking for guidance to the easiest way to handle
Privilege-level access to Dell or Cisco Network hardware, such as
Routers, and switches. Currently I have freeRADIUS running for 802.1x
WiFi authentication, which accesses a Kerberos database. i only need
to identify a small group of Network Engineers as Admins and allow
them access to the devices, but nobody else. What's the easiest way to
accomplish this in freeRADIUS, or if I need to use another method? I'm
not worried about command Authorization at the moment, although that
would be a "nice to have".

Thanks!
-brconflict