In 7.2 WLC code, it appears it is now possible to specify which RADIUS servers are used as the preferred server for authentication (
Security > AAA > RADIUS > Fallback to open the RADIUS > Fallback Parameters ).
There are 3 mode for this: off, passive & active.
In the passive mode, the operation is described in the config guide as :
—Causes the controller to revert to a server with a lower priority from the available backup servers without using extraneous probe messages. The controller ignores all inactive servers for a time period and retries later when a RADIUS message needs to be sent.
Does anyone know how long this 'time period' is? If it is only a few seconds, then it could be that user authentications are being used to test against a failed RADIUS server frequently & will experience annoying time-out delays, causing support calls etc.
Anyone know what it is, or if its configurable? I don't see anything in the docs...
Here you go.
RADIUS Server Fallback Feature on WLC.
Found this query while searching for the Fallback methods. My WLC is 8.0 and i can see that the time for passive fall back is configurable (default 300sec)