Mihai,
Each controller model can support a specified number of active VNSs, as listed below:
• C5110 — Up to 128 VNSs
• C5210 — Up to 128 VNSs
• C4110 — Up to 64 VNSs
• C20 — Up to 8 VNSs
• C25 — Up to 16 VNSs
• V2110 — Up to 64 VNSs
The Wireless AP radios can be assigned to each of the configured WLAN services and, therefore, VNSs in a system. Each Wireless AP can be the subject of 16 service assignments — 8 assignments per radio — which corresponds to the number of SSIDs it can support. Once a radio has all 8 slots assigned, it is no longer eligible for further assignment.
Thanks,
Jason