MOTOROLA MVME147S Embedded controller

An AT-8000 Series Fast Ethernet Switch has a MAC address table of 4 kilobytes. The switch uses the table to store the MAC addresses of the network end-nodes connected to the ports, along with the port number on which each address was learned. A switch learns the MAC addresses of the end-nodes by examining the source address of each packet received on a port. It adds the address and port on which the packet was received to the MAC table if the address had not already been entered in the table. The result is a table that contains all the MAC addresses of the devices that are connected to the switch’s ports, and the port number where each address was learned.

When the switch receives a packet

it also examines the destination address and, by referring to its MAC address table, determines the port on which the destination end-node is connected. It then forwards the packet to the appropriate port and on to the end-node. This increases network bandwidth by limiting each frame to the appropriate port when the intended end-node is located, freeing the other switch ports for receiving and transmitting data.

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