PLANET GSD-805 - Manual (Page 15)

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3. Switch Operation
3.1 Address Table
The Gigabit Ethernet Switch is implemented with an address
table. This address table composed of many entries. Each
entry is used to store the address information of some node in
network, including MAC address, port no, etc. This information
comes from the learning process of Gigabit Ethernet Switch.
3.2 Learning
When one packet comes in from any port. The Gigabit Ethernet
Switch will record the source address, port no. And the other
related information in address table. This information will be
used to decide either forwarding or filtering for future packets.
3.3 Forwarding & Filtering
When one packet comes from some port of the Gigabit Ethernet
Switch, it will also check the destination address besides the
source address learning. The Gigabit Ethernet Switch will lookup
the address-table for the destination address. If not found,
this packet will be forwarded to all the other ports except the
port which this packet comes in. And these ports will transmit
this packet to the network it connected. If found, and the
destination address is located at different port from this packet
comes in, the Gigabit Ethernet Switch will forward this packet
to the port where this destination address is located according
to the information from address table. But, if the destination
address is located at the same port with this packet comes in,
then this packet will be filtered. Thereby increasing the network
throughput and availability.