In-depth analysis of the application fields of Ethernet Switches

The following articles describe in detail the functions and principles of Ethernet switches. For some users who have just come into contact with this industry, the term "Ethernet switches" is a strange thing for them, after reading this article, we will provide you with relevant benefits.

As the main connection device of the LAN, the Ethernet switch is one of the fastest-growing network devices. With the continuous development of switching technology, the price of Ethernet switches decreases sharply, and switching to the desktop is the trend of the times. If you have a large number of users, busy applications, and a variety of servers on the Ethernet.

And you have not made any adjustments to the network structure, the performance of the entire network may be very low. One solution is to add a 10/100 Mbps switch over Ethernet. It can not only process 10 Mbps of conventional Ethernet data streams, but also support Mbps of Fast Ethernet connections.

If the network usage exceeds 40% and the collision rate exceeds 10%, the switch can help you solve some problems. Vswitches with Mbps Fast Ethernet and 10 Mbps Ethernet ports can run in full duplex mode and can establish dedicated 20 Mbps to Mbps connections.

Not only do vswitches have different roles in different network environments, but the impact of adding new vswitches and adding switch ports of existing vswitches on the network is also different in the same network environment. Fully understanding and understanding the network traffic mode is a very important factor in whether the switch can play a role.

Because the purpose of using a vswitch is to minimize and filter data traffic in the network, if a vswitch in the network needs to forward almost all received packets due to improper installation location settings, instead of optimizing network performance, a vswitch reduces data transmission speeds and increases network latency.

In addition to the installation location, if you blindly add vswitches in networks with low load and low Information volume, it may also have a negative impact. It is affected by the data packet processing time, the buffer size of the switch, and the need to regenerate new data packets.

In this case, a simple HUB is more ideal than a vswitch. Therefore, we cannot always think that a vswitch has an advantage over a HUB, especially when the user's network is not crowded and there is still a lot of available space, using the HUB can make full use of the existing resources of the network.

"Switch" is the term "Switch". It is derived from the English word "Switch", which is originally intended to be "Switch". When China's technical community introduces this word, it is translated as "Exchange ". In English, the verb "Exchange" and the term "Switch" are the same word. Note that the "Exchange" here refers to the signal exchange in telecommunications technology, which is not the same as the exchange of goods ).

In 1993, LAN switching equipment emerged. In 1994, the exchange network technology boom began in China. In fact, the exchange technology is a simplified, low-cost, high-performance, and high-port intensive exchange product, reflecting the second-layer operations of the complex exchange technology in the OSI reference model.

Like the bridge, the Ethernet switch simply decides to forward information based on the MAC address in each package. This type of forwarding decision generally does not consider the deeper information hidden in the package. The difference with the bridge adapter is that the forwarding delay of the switch is very small, and the operation is similar to the performance of a single LAN, far exceeding the forwarding performance between common Bridging networks.

The exchange technology allows the shared and dedicated LAN segments to adjust the bandwidth to reduce the bottleneck of information flow between the LAN. Now there are Ethernet, fast Ethernet, FDDI and ATM exchange products.
Similar to traditional bridges, vswitches provide many network interconnection functions.

Ethernet switches can economically divide networks into small conflicting domains to provide higher bandwidth for each workstation. Protocol transparency allows the switch to be directly installed in a multi-protocol network with simple software configuration. The switch uses the NIC of the existing cable, repeater, hub, and workstation, you do not need to perform high-level hardware upgrades. vswitches are transparent to workstations. This reduces management costs and simplifies the operations of adding, moving, and changing network nodes.

Using a specially designed integrated circuit, the switch can forward information on all ports at a line rate in parallel, providing much higher operation performance than the traditional bridge. For example, theoretically, a single Ethernet port pair contains 64 octal packets.

Transmission Rate of 14880bps is supported. This means that a "line rate" Ethernet switch with 12 ports that support six parallel data streams must provide a total throughput of BPS and six information flows (X14880bps/information flows ). The dedicated integrated circuit technology enables the switch to run with more ports. The port cost is lower than that of the traditional bridge.

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