![]() What about layer 2? What MAC addresses do we use for multicast traffic?įor layer 2 we also have a reserved prefix to use for multicast traffic. On layer 3 IANA has reserved the class D range (224.0.0.0 – 239.255.255.255) for multicast IP addresses. For broadcast or multicast traffic this bit will be set to 1. ![]() When we have unicast traffic this bit will be set to 0. ![]() ![]() In the first octet, bit 0 has been reserved for broadcast or multicast traffic. Multicast IP address live in the 224.0.0.0 – 239.255.255.255 range but what about MAC addresses and Ethernet frames? What do we do on layer 2 to make multicast work? Let me show you an example of a MAC address:Ībove you see an example of a MAC address. ![]()
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