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GE-DS-82 and 82-PoE Ethernet Managed Switch User Manual 209
Chapter 7
Switch Operation
Address Table
The 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 Ethernet Switch.
Learning
When one packet comes in from any port, the 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.
Forwarding & Filtering
When one packet comes from some port of the Ethernet Switching, it will also check
the destination address besides the source address learning. The Ethernet Switching
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
Ethernet Switching 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