TACACS
ACIOps can be configured to authenticate users via TACACS+. Authentication is handled via TACACS+, while authorization is handled
by ACIOps server. The first time a user is authenticated via TACACS, the user will be assigned the basic role of operator
.

Once a TACACS server is added, it appears on the list of servers.

You can add multiple servers, but only one server can be primary at a time.