The same happens to me
I have configured IGMP Snooping on CSS
In igmp tab I can see all port where IGMP join packet are received
BUT anyway multicast is flooded as broadcast on all running interfaces...

What your firmware version?
My problem occurs in version 2.8.

I think I found the cause!
Next post : viewtopic.php?f=17&t=140408&p=692454

Previous post: https://forum.mikrotik.com/viewtopic.php?f=17&t=137552 I think I found the cause! In the IGMP snooping tab, there is only a port for the multicast the receiving device in the Members Port. EXCLUDE THE ROUTER(WAN) PORT! IGMP Packets are not flooded! So I can not see any IGMP Join m...

I am using a CSS326 switch. I have configured IGMP Snooping on VLAN90. However, multicast seems to be broadcast. The SwOS version is 2.8 and is the same in 2.7. Port stat sw.png IGMP snooping sw2.PNG After changing the IPTV channel, the screen will not appear for about 2 minutes and then it will com...