Environment : This article applies to all Aruba Instant platforms and versions.
If you set a static IP address on the virtual controller, the address becomes virtualized. If the primary virtual controller fails, the IP address is transferred (similar to VRRP) to the AP that becomes the new master. An automatic election process selects the new master.
If you then enable Proxy RADIUS, all authentication requests are sent from the virtual controller management address. This is highly beneficial because only a single NAS entry must be created on RADIUS to cover the whole Instant cluster of up to 16 IAPs.