Both KBA links Syamantak provided should be visible on our Support portal.
The first one is titled Sonos connection recommendations and guidelines:
https://support.ruckuswireless.com/articles/000006140The second one has details on disabling directed Multicast on Unleashed:
https://support.ruckuswireless.com/articles/000006234--
If you who have newest, other Sonos equipment, find that any of these do not help, or that other commands were helpful, please let me/us know, and we'll update our articles, thanks!