With the rapid development of cloud computing, our traditional technology faces a huge threat. Among them, it is worthwhile to talk about traditional network virtualization. The network bears the role of transmission, but in the process of transmission, routing is indispensable. Partly, but because of the mixing, the efficiency is getting lower and lower.
When large-scale data centers emerge, devices, networks, and the like become more complex. Therefore, in order to solve the network problem, the "transport" and "control" layers are separated, and virtual networking occurs. What is a virtual network? In essence, it separates the “transport†layer and the “routing (control)†layer in the traditional network, and abstracts the traditional network infrastructure device into small modules with only transmission functions. The network characteristics and data transmission routes are all defined by the upper layer software and are precisely controlled.
With the development of IT technology, we have seen that traditional network virtualization is facing new challenges. The background of this challenge is that the in-depth development of the mobile Internet has completely changed people's lives and work. When it is transmitted to enterprises, its business is undergoing rapid changes. For example, many users' application scenarios need to achieve a million-level packet forwarding speed, so GB or even 10 GB of bandwidth throughput is required.
On the other hand, unlike CPU and memory and IO traffic, the processing of network packet forwarding and business logic is very complicated. It is necessary to add common rules in the middle of the entire network forwarding process, such as route lookup, flow control, and traffic statistics. Wait for a lot of business logic processing. As a result, on the one hand, there is a need for very high speed network data throughput, and on the other hand, these high speed forwarded data are required for complex business logic processing. The contradiction between the two causes the network performance to be unable to reach a high level for a period of time.
For the user, the traditional virtualized network has three major pain points: performance, the throughput has a bottleneck, can not meet the short-term high-incidence needs of enterprises, and the delay is high. For example, in some video playbacks, once the delay is too long, it will have a very bad impact on the amount of playback and user experience. Second, stability. Traditional virtualized networks not only have large fluctuations in performance, but also often cause packet loss problems. Finally, in terms of isolation, traditional virtualized networks have resource competition and cyber attacks.
Most importantly, with the diversification of enterprise business, there are many uncertain user scenarios in traditional virtualized networks. For example, telecom service forwarding, mobile games and online games acceleration, databases, caching, messaging middleware, Hadoop, Spark, live streaming, streaming media, and NFV. For example, in the case of telecom service forwarding and mobile game or online game acceleration service, these two scenarios are essentially high-speed forwarding scenarios for some small packets, and these scenarios have very high throughput for the network.
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