Switching Logic
MAC Addresses
Ultimately, the role of a LAN switch is to forward Ethernet frames. To achieve that goal, switches use logic—logic based on the source and destination MAC address in each frame’s Ethernet header.
This book discusses how switches forward unicast frames and broadcast frames, ignoring multicast Ethernet frames. Unicast frames have a unicast address as a destination; these addresses represent a single device. A broadcast frame has a destination MAC address of FFFF.FFFF.FFFF; this frame should be delivered to all devices on the LAN.
LAN switches receive Ethernet frames and then make a switching decision: either forward ...
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