There is a MAC address forwarding table in the switch. It records the correspondence between the MAC address and the switch port. A port can correspond to multiple MAC addresses, but one MAC address can not correspond to multiple ports. Which makes the switch with multi-level cascading capabilities, each switch in the forward message only need to know that the destination MAC from which of my port to reach on the line, and then put the frame to the port, as the back He does not care how the equipment is handled. Such a level of forwarding, know the computer's network card to connect the switch to the network after the card, the network card is a look at the MAC is their own, and then on the solution, by the three-tier protocol stack for processing.< /p>

The above is a process of forwarding tables and forwarding, then another key question is how the MAC address table of the switch is established, based on the origination of the request message, the source MAC and the port from which the establishment of the Corresponding to the other part of the message received when the MAC table if there is no such purpose MAC, then in addition to the port received other than the port of a flood, waiting for the end of the MAC terminal response.