![]() ![]() ![]() The 24-bit MAC address prefix 01-00-5E is reserved for layer 2 multicast. 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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