Advantek Networks ANS-2402G ユーザーズマニュアル

The switching hub is implemented with a MAC address table which 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 switching hub 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.

3.2

Filtering and Forwarding

When one packet comes in from any port of the switching hub, it will check the

destination address besides the source address learning. The hub 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 port which this packet comes in. 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.

3.3

Store and Forward

Store-and-forward is one kind of packet-forwarding methodology. As a

store-and-forward switching hub, 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.

Several things need to be avoided: