Hi Kosuke,
There is no hard limit for the number of licenses which can be installed. We can install any number of licenses exceeding the platform limits on a given controller. With centralized licensing enabled, these licenses can be shared with the other controller in the cluster.
(Aruba) #show license aggregate
Aggregate License Table
-----------------------
Hostname IP Address AP PEF RF Protect xSec Module ACR Last update (secs. ago)
-------- ---------- --- --- ---------- ----------- --- -----------------------
Aruba 10.17.170.194 10752 5527 0 0 0 14
Total AP License Count :10752
Total PEF License Count :5527
Total RF Protect License Count :0
Total XSEC License Count :0
Total ACR License Count :0
Cheers,
Sukumar Krishnamoorthy