Moved: Reply To: Ethernet Introduction for CCNA R&S

Hi Rakesh,

It’s unlikely that we ever will have issues with MAC address exhaustion. 2^24 = 16777216, that’s close to 17 million unique MAC addresses for 1 OUI.

Within a broadcast domain, you need to have unique MAC addresses. Broadcast domains are typically very small so it’s very rare to see duplicate MAC addresses within a broadcast domain. If a vendor runs out of MAC addresses for their OUI, they probably can get another OUI.

Perhaps someday we run out of MAC addresses but I doubt we will still be using MAC addresses by then :slight_smile:


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