We have over 500 iPads and 100 Apple TV's on one site. We are having issues with iOS8 trying to AirPlay to the Apple TV's as the list is to large. We have a SSID specifically for iPads & ATV's across the site and want to VLAN by building throughout the site to reduce the list. Our problems are that the buildings are within close proximity and want to make sure our devices when roaming around the site between buildings get the correct IP within a VLAN. (we are using iPad 2's). iPad users work across the whole site every hour.