I've been trying to discover for a while how primary and secondary RADIUS servers work on WLC 4400s. If the primary RADIUS server goes down, and the secondary is used, at what point does the controller go back to the primary once it's back up? Does it wait until the secondary goes down, or does it immediately switch back to the primary once it becomes available?
Thanks in advance!
On 4.2 and previous versions, if the primary goes down, then the secondary is used until the secondary is not available. So if you want to froce the primay to be the radius server to be used, reboot the secondary. Then the tertiary then back to the primary. 5.0 has a feature in which you can set a keep alive so that when the primary comes back up, the primary will be used again. 5.0 code in not a good code version though.