First question is how are your APs discovering your controllers during the boot process? DHCP , DNS, ADP ?
- The best thing to do is add the 3rd one(7200) as Standby Master to the Master (M3) using VRRP that is in case both are in the same VLAN ?
- Then change the priority in the VRRP to be higher on the Standby master .
Note: Make sure all controllers are in the same AOS code
#7240