We have a PIM-SM network set up for informacast. After upgrading to 10.19 and 10.20 from the 9.x firmware, my endpoint devices do not receive the multicast traffic. doing packet captures I can see the multicast traffic go into the uplink interface of the meraki switch but it never reaches the client port the device is connected to.
In the 9.x firmware I have IGMP Snooping disabled and Flood Multicast packets enabled for the whole network and this worked. Same settings in 10.x do not work.
I tried that. It helps my IP phones receive my MCast but it kills my IP speakers. If I turn it off again the speakers recive the MCast but not the phones. I have had this problem before with the speakers not supporting IGMP Snooping but as I said both speakers and phones worked with snooping off and flood on in the 9 firmware.