Cisco Cisco 2504 Wireless Controller Troubleshooting Guide

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Bonjour messages would quickly consume up valuable airtime across the network. The VLAN
Select feature can be used to assign clients to an array of VLANs on the backend, essentially
breaking up the multicast domain. An option of the VLAN Select feature is the Multicast VLAN
which allows a specific interface to be selected for downstream multicast traffic.
For more information on VLAN Select, refer to 
VLAN Select and Multicast Optimization Features
Deployment Guide
.
Using VLAN Select with the multicast VLAN feature allows a separate subnet to be used for Apple
TV devices, while still enabling AirPlay for use by all clients on a separate WLAN.
Note: The use of VLAN Select with other Bonjour applications (like messaging, or iTunes sharing)
is limited because they are dependent on end user devices being able to send out announcements
to other end user devices.
Complete these steps:
Go to the Controller tab > Interfaces on the left-hand menu. Create the necessary
interfaces for the client VLANs (client-a1 and client-a2 in this example) and also an interface
for the Apple TV subnet (client-mcast in this
example).
1.