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This article introduces the relevant knowledge of "what is the working principle of the switch in the switched LAN". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The working principle is to establish multiple concurrent connections between its multiple ports, in which the layer 2 switching of the LAN switch performs the bridging function and forwards data according to the MAC address. The exchange speed is fast, but the control function is weak and there is no routing function. Layer 3 switching forwards data according to IP address and has routing function.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

Basic working principle: the core equipment of the switched LAN is the LAN switch, which can establish multiple concurrent connections between its multiple ports, in which the layer 2 switching of the LAN switch performs the bridging function and forwards data according to the MAC address. The exchange speed is fast, but the control function is weak and there is no routing function. Layer 3 switching forwards data according to IP address and has routing function.

Low switching latency is the main feature of LAN switches. From the level of transmission delay, if the switch is tens of microseconds, the bridge is hundreds of microseconds, the router is several thousand microseconds; support different transmission rates and operating modes; high transmission broadband; support virtual LAN services. Switched local area network is the foundation of virtual local area network, and the current switches basically only hold virtual local area network.

Extended data:

The internal structure of the switch

1. Shared memory structure, which is easy to implement, but requires large memory capacity and high management cost. And because it takes time to access the memory, it is impossible to achieve wire-speed switching between a large number of ports, so it is more suitable for small system switches.

2. Cross-bus structure, which is suitable for single-point transmission and has some problems for multi-point transmission.

3. The hybrid cross-bus structure divides the integrated cross-bus matrix into small cross-bus matrices, which are connected by a high-performance bus. The advantage is that the number of cross buses is reduced, the cost is reduced, and the bus contention is reduced.

4. Ring bus structure, which is used to collect bus status, process routing, flow control and clean up data bus. The biggest advantage of the ring bus structure is strong scalability and low cost, because the ring structure is easy to gather bandwidth, when the number of ports increases, the bandwidth increases accordingly.

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