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https://communities.vmware.com/thread/107659
Jun 09, 2010 · Unfortunately the NIC that VMware emulates does not support Multicast (some intel nic). I ran into this problem running (Junos - thats juniper OS) on vms for testing porpuses, routing protocols that used multicast traffic will not work. And had to be tweaked to use Unicast which made it all the much difficult.
https://kb.vmware.com/s/article/2044735
Multicast Filtering. Because of limitations in the original VMware vSwitch forwarding model and the construction of the multicast mechanism, multicast traffic passing through a vSwitch can be received by virtual machines which have not subscribed to the multicast group sending that traffic.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-97724211-5167-428F-A217-871963A7DFF7.html
In basic multicast filtering mode, a vSphere Standard Switch or vSphere Distributed Switch forwards multicast traffic for virtual machines according to the destination MAC address of the multicast group. When joining a multicast group, the guest operating system pushes the multicast MAC address of the group down to the network through the switch.
https://blogs.vmware.com/vsphere/2013/05/vxlan-series-multicast-basics-part-2.html
May 03, 2013 · When it comes to VXLAN, the multicast support requirements in the physical network are dictated by the number of transport VLAN used in the design. As mentioned in the last post, the transport VLAN carries VXLAN encapsulated traffic. If you are using a single transport VLAN then there is no need for multicast routing protocol (PIM).
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-50AF72D4-F766-4D68-8330-BA15250E4E99.html
Use multicast snooping on a vSphere Distributed Switch to forward traffic in a precise manner according to Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) membership information that virtual machines send to subscribe for multicast traffic.
https://www.reddit.com/r/vmware/comments/6k2om6/how_to_enable_multicast/
If you were running vSphere 6.5 it's possible you could have a version 5.5 vDSwitch which does not support IGMP snooping (multicast). But it seems like you wouldn't see it from some VMs and not others if that were the case.
https://blogs.vmware.com/vsphere/2014/09/virtual-san-networking-guidelines-multicast.html
Sep 30, 2014 · For instructions on modifying the multicast addresses of the cluster, please see VMware KB 2075451: Changing the multicast address used for a VMware Virtual SAN Cluster. Use tcpdump-uw and nc to validate that each Virtual SAN node can send and receive multicast traffic.
https://serverfault.com/questions/321155/virtualization-with-multicast-receive
guest OSes can receive multicast traffic from the host machine. some services running on the guest OS (eg: port 80) can be port forwarded, so it's visible on the host and other machines. I tried vmware player, it doesn't support multicast at all. I managed to set up port forwarding with Virtualbox, but multicast doesn't work seem to work.
https://www.borgcube.com/blog/2016/03/12/multicast-support-in-vsphere/
The short answer is the vSwitch does not play a role in the IGMP join and leave messages that the VMs send in order to start and stop receiving multicast groups respectively. The vSwitch, and this is for both for the VSS and vDS, have an inherent knowledge of the configuration of the VM’s vNICs.
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