07-22-2014 01:10 PM
Technically, there is no limit to the number of IAP-225 in a cluster. They all must, however, be in the same management vlan in order to see each other. The general practice is to limit each cluster to around 130 - 150. Some people on this board, however, choose to break them up into smaller clusters then enable L3 Roaming between them.
07-22-2014 01:27 PM
The latest user guide does recommend a max cluster size of 128, though in theory you can have more.
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ACCP, ACMP, ACMX #294