Friends,
According to Aruba controller documentation, when not doing load balancing, the list of RADIUS servers in a server group is an ordered list. By default, the first server in the list is always used unless it is unavailable, in which case the next server in the list is used.
I have two questions about how this fail over mechanism works.
First, how specifically does a controller determine that a RADIUS server in the list has failed? Is it based on the unresponsiveness of RADIUS messages and some hard coded timeout value? What are the precise rules for making this determination?
Second, will the controller periodically monitor a failed server to see if it has recovered, and bring it back into service, something often referred to as fail back? If so, how precisely does this work?
Thank you,
John