It’s possible to have the LWAPP AP connected to another WLC when the primary WLC is failing.
First we’re creating the Mobility Group with the WLC’s.
At the AP Page, we can specify the primary, secondairy and tertiary WLC.
Don’t put an ip address here, but the NAME of the WLC !
Now we have to enable the fallback at the page Controller / General
AP Fallback : enable
This feature makes sure that the AP returns to the primary WLC when it’s again up and running.