PLANET GSW-1200S - Manual (Page 35)

GSW-1200S User's Manual 29
4. SWITCH OPERATION
4.1 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.
4.2 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.
4.3 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
4.4 Store-and-Forward
Store-and-Forward is one type of packet-forwarding techniques.
A Store-and Forward Ethernet Switching stores the incoming