The working principle of a backbone switch

Many new Huawei distributor Client/Server applications and multimedia skills, led to the shared network traditional far can not meet the requirements, it will promote the nextarea network Internet backbone switch show.

1, the definition of Internet backbone switch

LAN Internet backbone switch has many ports, each port has dedicated bandwidth himself, and can connect the different network segment. Between each port Internet backbone switch communication is also, in parallel, which greatly promoted the information throughput. In order to further enhance thefunction, each port can also connected only one device.

In order to complete the Internet backbone interconnection between the switchor high-end server connection, LAN Internet backbone switch common have high-speed port of one or a few, such as 100MB Ethernet port, FDDI port or a 155MBATM port, and to ensure that the entire network transmission function.

The frame buffer Internet backbone switch is mainly from the promotioncohesive server port speed and response of the size, to improve the function of the whole network, and then to meet the requirements of the customers.Some high-end Internet backbone switch adopts full-duplex skills to further enhance the port bandwidth.

The previous network equipment basically using task approach half duplex, i.e.when a host sends a packet, it will not be able to accept packets whenreceiving data packets, time, will not be able to send data packets.

Because of the full duplex skills, namely the host in the transmission data packet also, also can receive the packets, the popular 10M port can lead to 20M port, 100M port can become popular 200M port, it will further enhance theinformation throughput.

Principle 2, the Internet backbone switch

The essence of traditional Internet backbone switch is provided with a multi-port bridge traffic control, namely the traditional (two) Internet backbone switch. The routing technology into Internet backbone switch, can complete thenetwork layer routing, it is known as the three layer exchange, this is the new development of Internet backbone switch.

The Internet backbone switch (the two layer exchange) task truth Internetbackbone switches and bridges, is a task at the link layer, network equipment,each port it has bridging function, each port can connect to a LAN or a highfunctional web site or server, device can through the self learning to investigate each port connection status. All ports are controlled by dedicatedprocessor, and control governance forwarding information via a bus.

Also can use specialized management software for centralized management. In addition, the Internet backbone switch in order to improve the speed and efficiency of data exchange, the general support of various methods.

(1) for storing and forwarding:

All the usual practice of bridge are using this approach. They are the data before frame column other port, the received frame storage memory in the internal, the inspection and then sent to the other port, so the delay is equal to the sum of time and treatment time take a good data frame. If the cascade is long, will lead to serious problems of function, but this method can filter the data frame error.

(2) entry method:

This method only check the data frame destination address, which makes thedata frame Jane when erect can spread, and greatly reduce the delay.

The defects are: frame error will be reported to. Small probability of errorframe conditions, can be used to improve the transmission speed of entrymethod. Huawei Switch The frame error probability larger circumstances, can be used tostore and forward / retransmission to reduce the error frames.

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