In a switched Ethernet network is there a use-case for having VLAN tags for frames that have a multicast MAC as destination address?
I cannot find a use-case because:
VLANs are generally used for limiting the broadcast domain and for security, both of which can be achieved using multicast frames when there is a switch in the network which knows which multicast MAC address is reachable on which all ports.
Best Answer
Yes, they are relevant. Multicast frames are layer 2 constructs, so they are still bound by the layer 2 domain. You still need a router to forward multicast frames to another L2 domain.