Planet GSW-1200S User Manual download pdf (Page 35)

GSW-1200S User's Manual

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

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Planet GSW-1200S User Manual Page 35