2 radius server

How to config HotSpot to use 2 radius servers for authorization?

I have one central mikrotik with HotSpot setup.
So, I want to use 2 radius servers for authorization, if user cannot be detected on 1 radius server/usermanager that it automatically is directed and/or to be detected on another radius server/usermanager?

I know that once I get an ACCESS-REJECT no further RADIUS servers are checked but can I solve my problem using some kind of domains configuration. Is it possible to setup?
Thanks very much and best regards.
2 radius server.JPG

If the first radius server returns a reject, then MT ROS does not try the second Radius server but immediately returns reject. It does not even try to connect to the second one. If however, the first radius server times out, with no response at all, then it tries the second radius entry.

Found this thread perhaps it could help

http://forum.mikrotik.com/t/hotspot-with-more-than-one-radius-userman/36710/1