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3. SWITCH OPERATION
3.1 Address Table
The Fast 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 Fast Ethernet Switch.
3.2 Learning
When one packet comes in from any port, the Fast 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 ltering for future packets.
3.3 Forwarding & Filtering
When one packet comes from some port of the Fast Ethernet Switch,
it will also check the destination address besides the source address
learning. The Fast 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 Fast 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 ltered.
There by increasing the network throughput and availability.