Multicast MAC Addresses Notation

We spoke about Layer3 addressing on multicast, what about the Layer2 which is the MAC address? Do we have special MAC addresses on multicast? The answer is yes.
IANA has allocated also for Layer2 multicast addressing a range. The range start from 01:00:5E:00:00:00 through 01:00:5E:7F:FF:FF. This will leave for us 23 bits available to be used for multicast group ID.

Bottom line, whenever you see a MAC address going to a destination and starting with 01:00:5E, then know that this is a multicast Layer2 addressing.

This is all what I wanted to explain in this chapter. I know you are wondering where the LABS are, I promise you that starting next chapter we will start doing LABS and a lot of them ????. See you in the upcoming chapter.


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