What did layer-3 switching technology do for us?

The people who first proposed the layer-3 switch technology revealed that the layer-3 switch is an important factor in using Intranet applications, it organically and intelligently combines the advantages of L2 switches and L3 routers into a flexible solution to provide line rate performance at all levels.

This integrated structure also introduces policy management attributes, which not only associate Layer 2 with Layer 3, but also provides traffic prioritization, secure access mechanisms, and a variety of other flexible functions. Layer-3 switches are divided into three parts: LAN interface layer, layer-2 switching matrix layer, and layer-3 Switching Matrix routing control ,.

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With the continuous promotion and application of layer-3 switches in the market, layer-3 switching technology and its products have been widely used in the construction of enterprise networks/Campus Networks and broadband IP networks, such as man and Smart Community access, market demand and Technology Development boost the in-depth development of such applications.

Applications of layer-3 switching penetrate into the edge access layer from the initial backbone layer and the aggregation layer in the middle. Different manufacturers are also launching a series of L3 switches with better performance. Generally, these three-layer switching products use programmable and scalable ASIC chip technology and provide the following rich features: different products from different manufacturers or even the same manufacturer, only some of the features can be satisfied or partially satisfied)

The application of a layer-3 switch is actually very simple. It is mainly used to replace a traditional router as the core of the network. Therefore, all areas that require no WAN connection and require a router can be replaced by a layer-3 switch. In the enterprise network and teaching network.

A layer-3 switch is usually used in the core layer of the network. It uses a layer-3 switch technology to connect Gigabit ports or MB ports to different subnets or VLANs. Because of its relatively simple network structure, the number of nodes is relatively small. In addition, it does not require many control functions and requires low costs.

In the current hot broadband network construction, layer-3 switches are generally placed in the center of the residential area and the Convergence layer of multiple residential areas. The core layer generally uses high-speed routers. This is because network interconnection is only one requirement in the construction of a broadband network, because the user requirements in the broadband network are different, so more control functions are required, this is the weakness of a layer-3 switch. Therefore, the core of the broadband network is generally high-speed routers.

The full duplex of a switch means that the switch can receive data while sending data. The two are synchronized, as if we call each other and can hear the other party's voice while talking. All current vswitches support full duplex. The advantage of full duplex is low latency and high speed.

When talking about full duplex, we can't help but mention another concept closely related to it, that is, "Half Duplex". The so-called half duplex refers to only one action in a period of time. For example, a narrow road, with only one vehicle passing through.

When there are currently two vehicles on the road, in this case, only one vehicle is allowed to pass first, and then the other one is driving again. This example shows the principle of half duplex. Early walkie talkie and early hub devices are half duplex products. With the continuous advancement of technology, half duplex will gradually exit the stage of history.

In a broad sense, there are two types of network switches: WAN switches and LAN switches. WAN switches are mainly used in the telecom field to provide basic communication platforms. LAN switches are used in local networks to connect terminal devices, such as PCs and network printers.

The transmission media and transmission speed can be divided into three-layer switch technology, Fast Ethernet switch, Gigabit Ethernet switch, FDDI switch, ATM switch and ring switch. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches.

Generally, enterprise-level switches are rack-mounted, and department-level switches can have fewer rack-mounted slots) or fixed configurations, the working group-level switch is relatively simple with fixed configurations ).

On the other hand, from the perspective of application scale, enterprise-level switches support large enterprise applications with more than 500 information points as enterprise-level switches, and department-level switches support Switches of medium enterprises with less than 300 information points, switches that support less than 100 information points are working group-level switches. The vswitch mentioned in this Article refers to a LAN switch.

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