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3. SWITCH OPERATION
3.1 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.
3.2 Learning
When 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.
3.3 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. There by increasing the network throughput and
availability.
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