Exchange technology is developing in two directions. One direction is that the speed is getting faster and faster, and has jumped from gigabit to 10 gigabit.
The other direction is from the initial layer 2 switching to layer 3 switching,
It has been developed to the seventh layer of the network application layer exchange.
Visually speaking, the faster and faster the speed is to take the route of quantitative change, and the higher and higher the level of exchange is to take the path of qualitative change.
How to make full use of bandwidth resources and manage applications and content on the Internet has increasingly become the focus of service providers. In the case of bandwidth applications, below the network layer is no longer the key to the problem. Instead, it is to improve the level of network services and complete the transition from the Internet to intelligent. How to solve the problem from the transport layer to the application layer, the network technology that specifically manages the transport layer to the application layer becomes very important, which is the most fundamental reason for the development of the application layer switching technology.
Application layer switching is to unpack each layer of each data packet layer by layer, and to identify the application layer information, so as to realize the identification of the content. To solve the problem of distinguishing applications, it is a good way to use network identification devices to forward corresponding traffic according to different application services.
Application layer switching structure
Since the application layer information required to complete the above functions is inside the data packet, this requires the content recognition device to peek into the inside of each data packet of each session. If a software-based architecture is used, it will cause severe delays and performance degradation, and congestion is inevitable. As a result, the application-layer switching technology implemented entirely in hardware has achieved technical advantages. All the functions of the high-level network are realized through the application layer switches, and the network resources are used to the maximum. It becomes possible to allocate network resources better.
Structurally, the application layer switch concentrates all functions on a dedicated special application integrated circuit or ASIC. ASICs are cheaper than traditional router CPUs, and are usually distributed on network ports. They include 50 ASICs in a single device and can support hundreds of interfaces. The new ASIC allows smart switches / routers to forward data at extremely fast speeds on all ports—no matter what type of network traffic is called wire-speed forwarding application layer traffic.
In terms of high availability and load balancing, there are many advanced tools that can utilize the application layer information returned by the application to the end user. Users can not only verify whether the correct content is being sent, but also open the data packets transmitted on the network and make load balancing decisions based on the information in the packets.
This intelligent migration goes beyond the function of the fourth layer. Devices with at most Layer 4 functions cannot recognize the different types of transport streams flowing through this port, so they treat all transport streams equally.
But the transport streams are not all the same. For load balancing products, it is very useful to know whether the data flowing through this port is streaming media or a simple request for a product in the catalog. Perhaps the merchant wants to give customers who need this catalog item a higher priority. Many devices with Layer 4 functions treat these two types of data in the same way, so streaming media data may be sent to servers that cannot respond, resulting in erroneous information and delays.
The seventh layer of intelligence can be further controlled, that is, control of all transport streams and content. Part of the function of this type of product with the seventh layer of knowledge is to ensure that different types of transport streams can be given different priorities. A device with Layer 7 awareness does not rely on routing devices or applications to identify transport streams for differential services, general open policy services, or other service quality agreements. It can filter and assign priorities to transport streams. This saves you from having to rely on applications or network devices for these purposes. Layer 7 switching can achieve effective data flow optimization and intelligent load balancing.
Application range
On the Internet, Intranet, and Extranet networks, application-layer switches have great potential to use their ambitions.
Internet applications—business-to-consumer e-commerce, online customer support; server load balancing; user prioritization and control; adaptive operation redundancy—state failure recovery; electronic transaction processing guarantee; gigabyte-rate bandwidth management, etc. .
Intranet applications-personnel planning and construction, marketing automation, customer service; firewall load balancing; optimal server traffic orientation; mobile request processing; prioritization of content and transaction processing; and the use of Web site caches to accelerate content provision, etc.
Extranet applications-business-to-business e-commerce, supply chain automation, sales / service channel interaction; global server load balancing; access control; advanced traffic management for e-commerce; content filtering and bandwidth management.
In the era of e-commerce seeking data unification, XML is the only option. In order to quickly and correctly process each piece of data flowing through the network, the purpose of XML exchange is to specifically process XML data. The challenge faced by XML exchange is to quickly and correctly process each piece of data flowing through it. Application layer exchange.
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