To configure Multicast on a WLC, first you’ll have to enable it.
The 239/8 ip range can normally be used for Multicast, but due to some limitations it’s recommended to skip the 239.0.0.X – 239.128.0.X range.
Now config the router with :
Configure PIM on the Interface(s) of the router :
interface FastEthernet 0/0
ip pim dense-mode
On the switch configure :
ip igmp snooping vlan 10