a month ago
That question is not as simple to answer as you might think. There is no official limit, tested cluster size is 128 APs. There are probably other parameters, like network design, that can reduce performance in larger clusters.
Please check the Aruba Instant VRD for more information; or better work with your Aruba partner or local sales team to get to a proper design of your wireless network.
If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).