Main Structure and Application Scope of application layer Switches

An application layer switch is used to unlock each layer of encapsulation of various data packets, and then identify the switch information to understand the structure of the application layer switch. Exchange Technology is moving towards two directions. One direction is that the speed is getting faster and faster, and it has jumped from 1g to 10g. The other direction is from the first layer-2 exchange to layer-3 Exchange, which has now evolved to the layer-7 Application Layer exchange of the network. In an image, the speed is getting faster and faster, that is, the path of quantitative change, the level of exchange is getting higher and higher than the path of qualitative change.

How to make full use of bandwidth resources to manage applications and content on the Internet has increasingly become the focus of service providers. In the case of bandwidth applications, the network layer is no longer the key to the problem. Instead, it is to improve the level of network services and complete the transformation from the Internet to intelligence. How to solve the problem from the transport layer to the application layer is becoming very important. This is the most fundamental reason for the development of the application layer exchange technology.

The application layer switch identifies the content by unbinding each layer encapsulation of each data packet and identifying the information of the application layer switch. To solve the problem of distinguishing applications, it is a good way to identify devices by network and forward the corresponding traffic based on different application services.

Structure of the application layer switch

Because the application layer information required to complete the above functions is inside the data packet, this requires the content recognition device to peat the inside of each data packet in each session. If a software-based architecture is adopted, serious latency and performance deterioration will occur, and congestion will inevitably occur. Therefore, all application-layer switches implemented by hardware have achieved technical advantages. The application layer switch enables all the functions of the High-level network to maximize the use of network resources. the application layer switch is placed on the core layer or aggregation layer instead of close to the lower layer intervention layer, this allows network managers to allocate network resources at a lower cost.

In terms of structure, application layer switches focus all functions on a dedicated special application integrated circuit or ASIC. ASIC is cheaper than the CPU of traditional routers, and is usually distributed on Network Ports. It includes 50 ASIC in a single device and supports hundreds of interfaces. The new ASIC allows smart switches/routers to forward data at extremely high speed on all ports-no matter what type of network traffic, it is called line rate forwarding Application Layer traffic.

In terms of high availability and load balancing, there are many advanced tools that can use the application layer switch information returned by the application to the end user. The user can not only verify whether the correct content is being sent, but also enable the packets transmitted over the network, and make a load balancing decision based on the information in the packet. This kind of intelligent migration surpasses the fourth layer of functionality. Devices with a maximum of layer-4 functionality cannot identify different types of transmission streams flowing through this port, so they treat all transmission streams equally.

However, the transmission streams are not all the same. For Server Load balancer products, it is useful to know whether the data flowing through this port is streaming media or simple requests for a commodity in the product catalog, maybe the merchant wants to give the customer who needs this directory item a higher priority. Many devices with layer-4 functions treat these two types of data in the same way, so they may send streaming media data to servers that cannot respond, resulting in incorrect information and latency.

The intelligence on the seventh layer can further control all transmission streams and content. Some of these features of a layer-7 cognitive product ensure that different types of transmission streams can be given different priorities. Devices with layer-7 cognition do not rely on routing devices or applications to identify the transmission streams of Differentiated Services, General open policy services, or other service quality protocols, it can filter transmission streams and assign priority values. Therefore, you do not have to rely on applications or network devices to achieve these goals. Layer-7 switching can achieve effective data flow optimization and intelligent load balancing.

Application Scope

In the Internet, Intranet, and exclusive networks, application-layer switches have great application aspirations.

Internet applications-e-commerce and online customer support from enterprises to consumers; Server Load balancer; user priority arrangement and control; adaptive operation redundancy-State fault recovery; Electronic Transaction Processing guarantee; bandwidth management of the Kyrgyzstan byte rate.

Intranet application-personnel planning and construction, market sales automation, customer service, firewall load balancing, best server traffic targeting, mobile request processing; arrange content and transaction processing priorities and use the high-speed cache of Web sites to accelerate content supply.

Extranet applications-enterprise-to-enterprise e-commerce, Supply Chain Automation, sales/service channel interaction; Global Server Load balancer; access control; advanced traffic management for e-commerce; content Filtering and bandwidth management.

XML is the only choice in the era of e-commerce that seeks data unification. To quickly and correctly process each piece of data that flows through the network, the purpose of XML exchange is to process XML data, the challenge of XML exchange is to quickly and correctly process each piece of data that flows through, and it is also an application-layer-based exchange.