I have not been able to get our MS425 working with Multicasting. Its running on version 10.20.  As soon as I turn it on we get a bunch of DNS issues and the network goes bananas.  It also shows that the switch goes down and reboots.   We ended up moving our streams to 1 VLAN vs. 3 and turned on Snooping and that's the only way things have been stable. ... View more