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EV-401M / EV-401S User's Manual
19
4. SWITCH OPERATION
4.1 MAC Address Table and Learning
The converter built in with a MAC address table that is
composed of many entries. Each entry is used to store the
address information of network nodes on the network,
including MAC address, port ID, etc. The information is the
most important base to do packet filtering and forwarding.
When one packet comes in from any port, the switch will
learn the source address, port ID, and the other related
information in address table. Therefore, the content of the
MAC table will update dynamically.
4.2 Filtering and Forwarding
When one packet comes in from any port of the switch, it
will check the destination address besides the source
address learning. The switch will look up the address table
for the destination address. If not found, this packet will be
forwarded to all the other ports except the source port. If
found and the destination address is located at different
port from this packet comes in, the packet will be
forwarded to the port where this destination address is
located according to the information of address table. But,
if the destination address is located at the same port as
this packet comes in then this packet will be filtered.
4.3 Store and Forward
Store-and-forward is one kind of packet-forwarding
methodology. As a store-and-forward switch, it will store the
complete packet in the internal buffer and do the complete error
checking before transmitting to the network. Therefore, no error
packets will disturb the network. It is the best choice when a
network needs efficiency and stability.