VLAN broadcast not working unless MC is enabled

[gracino]

Have a Netonix WS-12-250-AC v1.5.0 that has the default VLAN and 4 other VLANs.
Having trouble reaching a device on one of the vlans unless I check the MC column on the ports page.
Seems the who-has broadcast message is not making it through the switch unless the MC option is checked.

Here is what I have.

Phone system ------vlan20---------Netonix-------vlan20-----PA sip device

I dont want multicast filtering on as some of the traffic going over that vlan is unsolicited multicast traffic for a school intercom.

what exactly does the MC option do and is this a bug?

[sirhc]

Multi cast should be ON.

what exactly does the MC option do

We did not write this feature it is a standard and is part of the switch core itself, we simply turn it ON or OFF

With that said multicast is handled pretty much the same way on most all switches:
https://en.wikipedia.org/wiki/Multicast