Planet XGS3-24042 User Manual download pdf (Page 711)

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Chapter 83 SWITCH OPERATION

83.1 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

in-formation comes from the learning process of Ethernet Switch.

83.2 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.

83.3 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

83.4 Store-and-Forward

Store-and-Forward is one type of packet-forwarding techniques. A Store-and-Forward Ethernet Switching

stores the incoming frame in an internal buffer, do the complete error checking before transmission. Therefore,

no error packets occurrence, it is the best choice when a network needs efficiency and stability.

The Ethernet Switch scans the destination address from the packet-header, searches the routing table

pro-vided for the incoming port and forwards the packet, only if required. The fast forwarding makes the

switch attractive for connecting servers directly to the network, thereby increasing throughput and availability.

How-ever, the switch is most commonly used to segment existence hubs, which nearly always improves

overall performance. An Ethernet Switching can be easily configured in any Ethernet network environment to

signifi-cantly boost bandwidth using conventional cabling and adapters.

Due to the learning function of the Ethernet switching, the source address and corresponding port number of

each incoming and outgoing packet are stored in a routing table. This information is subsequently used to

filter packets whose destination address is on the same segment as the source address. This confines

network traffic to its respective domain and reduce the overall load on the network.

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