Hi Buzz,
I definitely feel your pain on this issue. My University, Washington and Lee, is starting to hear rumblings of Airplay requests from faculty. I witnessed a few demos at Educause that used display mirroring from an iPad over an Apple TV and was really impressed with what it adds to the teaching experience.
First off, I completely agree with everything that Colin mentioned. We have two SSIDs that are using VLAN pools to provide client IPs. As Colin mentioned, that is going to make it hard to come up with a solution. Also, we use the following firewall directives on each of our controllers:
firewall deny-inter-user-bridging
firewall deny-inter-user-traffic
This blocks all client to client communication.
Here's how we're dealing with Airplay now: we have a couple of demo "carts" that have a Linksys router with an Apple TV connected via an Ethernet cable. The problem with this solution is that it is not scalable and is a kludge, at best.
Here's what I've been thinking as a potential future solution:
1. Remove the above firewall commands.
2. Write an ACL that would be a deny user to user traffic for all of our current roles.
3. Add two new user roles, one for the iPads and one for the Apple TVs. These new roles would allow our Help Desk to easily monitor the devices in Airwave.
4. Add the MAC addresses of the Apple TV and the iPads to the internal DB on the master controller.
5. Here's what I'm not sure about... I would try hard coding the VLAN into the new roles that were created in step #3. I'm not sure if this would work with VLAN pooling enabled.
I think we could have a semi-scalable solution if step #5 would work.
My partner in crime at the University brought up another idea. He mentioned we could come up with a mobile cart comprised of Aruba gear. We could then provide a WPA2-PSK network that would be managed through the Aruba infrastructure and could provide a wireless network for the Apple TV and iPad. The only downside of this would be the additional cost of the access points in the cart and the potential of having a lot of gear "down" in Airwave.
-Mike