![]() The switch sends them directly to the local multicast router, which then interprets them to join the virtual machine to or remove it from the group. The switch does not interpret the IGMP messages that a virtual machine sends to join or leave a group. ![]() The switch saves the mapping between the port and the destination multicast MAC address in a local forwarding table. ![]() When joining a multicast group, the guest operating system pushes the multicast MAC address of the group down to the network through the switch. 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. ![]() In addition to the default basic mode for filtering multicast traffic, vSphere Distributed Switch 6.0.0 and later releases support multicast snooping that forwards multicast traffic in a more precise way based on the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) messages from virtual machines. ![]()
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