I have a Cisco layer 3 switch (Catalyst 3560) and a wireless LAN that uses a Cisco LAN Controller (WLC 2504) and AP1042 access points.
I have connected the Sonos components to the wired LAN on the same subnet as a computer with my music library, and it is able to connect to the Sonos components.
However, I am unable to get my iOS devices on the WiFi network (same subnet) to connect to the Sonos components. I have enabled multicast on the WLC, and added the multicast group address 22.214.171.124 that I found on forum number 27459. (The iOS AppleTV Remote app started working when I enabled multicast, so there's some indication that it's working generally.)
Does anyone have experience with this that you could share? Are there other configuration parameters--on the WLC or the switch--that need to be set?