M4100 Bonjour Configuration?

Hi,

We've got a combination of M4100 switches (26G, 50G, POE, etc...) as well as some smaller switches and we're finding that Bonjour is not always working. I suspect this "sometimes" is related to whether it's on Wi-Fi or not, or how far from the router (e.g., which switch).  Are there features (IGMP, multicast, etc...) that we should be turning on/off to allow for Bonjour to work on the M4100s?

Thanks!

Neil