Hi, I finally got it properly working. changes I've made: igmp querier and BCC server in same vlan and subnet, Although the latter is not really a hard requirement, but better to do anyhow. More important and very obvious but easy to overlook, disable unknown multicast stream flooding on all switches. 🙂 Tracing shows, clients need to explicitly join the streams and block these when leaving/changing the stream. it is all IGMPv3. What I do lack is a proper overview of the clients joining particular streams. Meraki is currently the only switch vendor not showing this. I made a request to Meraki to have this incorporated in the Meraki features. Thanks to all for your feedback
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