I've to upgrade old 802.11b Cisco WLAN to Aruba. As budget is very limited we will use IAP and virtual controller. 95% of APs will be IAP-103 (140 units) we will have also have IAP-205 (6 units). I'm worry about IAP scalability - what is maximum AP and clients supported in one IAP domain ?
It is recommended to have up to 128 IAPs within the same cluster (Not a hard set limit)
It can support up to 2048 Clients (Not a hard set limit)
But you can enable Layer-3 mobility between two Clusters that way users can roam between the two
If it's important if Master AP (Instant Controller) will be IAP-205 or IAP-103 - I assume 103 can have less RAM and CPU power than 205.
The AP with the most capable HW will be the Master