Mac Address Table & Learning; Filtering And Forwarding; Store And Forward - Encore ENHGS-800 Manual

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4. Switch Operation

4.1 MAC Address Table and Learning

The switch is implemented with a MAC address table, which is composed of many

entries. Each entry is used to store the address information of network nodes on the

network, including MAC address, port ID, etc. The information is the most important

base to do packet filtering and forwarding.

When one packet comes in from any port, the switch will learn the source address,

port ID, and the other related information in address table. Therefore, the content of

the MAC table will update dynamically.

When one packet comes in from any port of the switch, it will check the destination

address besides the source address learning. The switch will look up the address

table for the destination address. If not found, this packet will be forwarded to all the

other ports except the port where the packet comes in. If found, and the destination

address is located at different port from this packet comes in, the packet will be

forwarded to the port where this destination address is located according to the

information of address table. But, if the destination address is located at the same

port as this packet comes in, this packet will be filtered.

Store-and-forward is one kind of packet-forwarding methodology. As a

store-and-forward switch, it will store the complete packet in the internal buffer and

do the complete error checking before transmitting to the network. Therefore, no

error packets will disturb the network. It is the best choice when a network needs

efficiency and stability.

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