Ethernet Addressing
At the Data Link Layer, Ethernet, Token Ring and FDDI all share the same addressing format of 48 bits. This, as many other things in networking, came from Xerox PARC, but is now administered by the IEEE. Think of this like a social security number and a name. I am certain there is another Donna Harrington in the world, but we do not share the same social security number. I don't think I'll capture my social security number for you in Sniffer just in case.
Figure 5-16 illustrates some examples of vendor codes. It is not my intent to make any snide vendor remarks in the case of duplicate addresses because even the well-known manufacturers have made mistakes. Take a look at Example 5-21 or one of your previous show interfaces ...
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