I have like 20 Linux virtual machines and some Cisco routers I want to ask Can I use UCS as a centralized authentication for my Linux and Cisco machines ?
I mean instead of using SSH login each time ? and is it better FreeIPA ?
Yes you can.
install freeradius and configure it with your equipment!
When installing freeradius it automatically runs the LDAP-based authentication service
With this, you can authenticate your users via RADIUS against the LDAP. Network access can be configured per user or group. Then you just have to configure your UCS system as your RADIUS server in the cisco switches.