ethernet logical addressing
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Ethernet Logical Addressing
In Ethernet, LAN devices must have a unique identifier on that specific domain. LAN devices
use a Media Access Control (MAC) address for such purpose. MAC addresses are also referred
to as hardware addresses or burned-in addresses because they are usually programmed into the
Ethernet adapter by the manufacturer of the hardware.
The format of a MAC address is a 48-bit hexadecimal address. Because hexadecimal uses the
digits 0-9 and the letters a-f (for numbers 10-15), this yields a 12-digit address. MAC addresses
are represented in any one of four formats. All the formats properly identify a MAC address and
differ only in the field separators, as follows:
Dashes between each two characters: 00-01-03-23-31-DD
Colons instead of dashes between each two characters: 00:01:03:23:31:DD
Periods between each fourth character: 0001.0323.31DD
The digits without dashes, periods, or colons: 0001032331DD
Cisco routers typically use the 0001.0323.31DD formatting, while Cisco switches running
Catalyst Operation System (Catalyst OS) images use 00:01:03:23:31:DD to represent the same
address.