FreeRADIUS authentication

Good morning,
I would need some help in performing proper authentication via an external FreeRADIUS server.
The topology in question is simple: I have two OpenWRT devices that are connected via a cable where one acts as a supplicant (so it sends the authentication request) and the other one instead performs the authenticator role (connected to the freeRADIUS). I would like to understand how to properly configure the two files required for authentication, namely "wpa-supplicant.conf" and "hostapd.conf", but more importantly understand if it is possible to establish a network connectivity lockout as a result of a failed authentication.
Thank you in advance.