https://www.cisco.com/c/en/us/support/docs/security/firepower-9000-series/212713-firepower-extensible-operating-system-f.html
Firepower eXtensible Operating System (FXOS) 2.2: Chassis Authentication and Authorization for...
This document describes how to configure RADIUS Authentication and Authorization for the Firepower eXtensible Operating System (FXOS) chassis via ACS
extensible operating systemfirepowerfxos