blocks|key|1611521|text|你可能会发现这个很有用：SDN+Layer+Architecture|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1611522|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc7426/^0|C|M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You may find useful this: <a href="https://www.rfc-editor.org/rfc/rfc7426/" rel="nofollow noreferrer">SDN Layer Architecture</a>

blocks|key|1611602|text|在进入SDN之前，我们需要了解一些术语。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1611603|控制平面：决定将流量发送到何处的平面|offset|length|style|BOLD|1611604|数据平面：执行这些决策并转发流量的平面|1611605|管理平面:系统的元素，用于配置、监视网络堆栈的所有层和系统的其他部分，并向其提供管理、监视和配置服务|1611606|传统网络设备：|1611607|1611608|控制平面、管理平面和数据平面驻留在设备本身上。|unordered-list-item|1611609|每个设备都有自己的大脑，并且彼此断开连接，并使用各种协议来保持连接，这些协议很复杂，而且控制这些协议的行动的弹性程度也很高。complex.|1611610|Think+|1611611|传统网络的一种类型，由于多个断开连接的大脑不能协同工作，因此更容易发生故障。|1611612|1611613|SDN:+(将硬件与软件解耦)|1611614|SDN架构分为三层|1611615|1611616|应用程序Layer|ordered-list-item|1611617|Control+Layer|1611618|Infrastructure+Layer|1611619|1611620|基础设施层：|1611621|由网络设备组成，其中包含数据平面和工作在Open+Flow协议上，或者您可以说使用Open+Flow+API进行通信。|1611622|控制层：|1611623|由控制平面和管理平面组成。|1611624|应用层：|1611625|在这一层中，用户可以获得设备的概述并查看拓扑。|1611626|应用层和控制层之间的链路通常称为NorthBound接口|1611627|控制层和基础架构之间的链路称为SouthBound接口|1611628|SDN的优势：|1611629|1611630|解耦控制和数据平面涉及将数据平面与网络硬件分开，并将控制平面移动到软件层。|1611631|通过将网络从硬件中抽象出来，策略不再需要在硬件本身上执行。|1611632|相反，使用集中式软件应用程序作为控制平面使网络虚拟化成为可能。|1611633|1611634|entityMap^0|0|0|5|0|0|5|0|0|8|0|0|7|0|0|0|0|0|0|0|0|4|0|0|0|0|0|0|0|0|6|0|0|0|4|0|0|0|4|0|0|G|C|0|F|C|0|4|3|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|23|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|24|8|@$D|25|E|26|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|27|8|@$D|28|E|29|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|2A|8|@$D|2B|E|2C|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|2D|8|@$D|2E|E|2F|F|G]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|2G|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|2H|8|@]|9|@]|A|$]]|$1|R|3|S|5|Q|7|2I|8|@]|9|@]|A|$]]|$1|T|3|U|5|Q|7|2J|8|@]|9|@]|A|$]]|$1|V|3|W|5|Q|7|2K|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|2L|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|2M|8|@$D|2N|E|2O|F|G]]|9|@]|A|$]]|$1|10|3|11|5|6|7|2P|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|2Q|8|@]|9|@]|A|$]]|$1|13|3|14|5|15|7|2R|8|@]|9|@]|A|$]]|$1|16|3|17|5|15|7|2S|8|@]|9|@]|A|$]]|$1|18|3|19|5|15|7|2T|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|2U|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|2V|8|@$D|2W|E|2X|F|G]]|9|@]|A|$]]|$1|1D|3|1E|5|6|7|2Y|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|6|7|2Z|8|@$D|30|E|31|F|G]]|9|@]|A|$]]|$1|1H|3|1I|5|6|7|32|8|@]|9|@]|A|$]]|$1|1J|3|1K|5|6|7|33|8|@$D|34|E|35|F|G]]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|36|8|@]|9|@]|A|$]]|$1|1N|3|1O|5|6|7|37|8|@$D|38|E|39|F|G]]|9|@]|A|$]]|$1|1P|3|1Q|5|6|7|3A|8|@$D|3B|E|3C|F|G]]|9|@]|A|$]]|$1|1R|3|1S|5|6|7|3D|8|@$D|3E|E|3F|F|G]]|9|@]|A|$]]|$1|1T|3|-4|5|6|7|3G|8|@]|9|@]|A|$]]|$1|1U|3|1V|5|Q|7|3H|8|@]|9|@]|A|$]]|$1|1W|3|1X|5|Q|7|3I|8|@]|9|@]|A|$]]|$1|1Y|3|1Z|5|Q|7|3J|8|@]|9|@]|A|$]]|$1|20|3|-4|5|6|7|3K|8|@]|9|@]|A|$]]|$1|21|3|-4|5|6|7|3L|8|@]|9|@]|A|$]]]|22|$]]

We need to understand few terms before going to SDN.

Control Plane: The plane that determines where to send traffic

Data Plane: The plane that executes these decisions and forwards traffic

Management Plane: Element of a system that configures, monitors, and provides management, monitoring and configuration services to, all layers of the network stack and other parts of the system

Traditional Network Devices:

<ul>
<li>Control Plane, Management Plane and Data Plane reside on device itself. </li>
<li>Each device has its own brain and disconnected from each other and uses all sorts of protocols to stay connected.</li>
<li>Yet such protocols are complex and levels of resiliency to control action of such protocols also complex.</li>
<li>Think of traditional network as the type of network that is more prone to failure due to multiple disconnected brains not working together with one another.</li>
</ul>

SDN: (Decoupling hardware from Software)

SDN architecture is divided into 3 layers

<ol>
<li>Application Layer</li>
<li>Control Layer</li>
<li>Infrastructure Layer</li>
</ol>

Infrastructure Layer:

Consist of Network Devices which contains Data Plane and work on Open Flow Protocol or you can say uses Open Flow API to communicate.

Control Layer:

Consist of Control Plane and Management Plane. 

Application Layer:

In this layer user can get an overview of Devices and see Topology. 

Link between Application and Control Layer is generally called NorthBound Interface

Link between Control Layer and Infrastructure is called SouthBound Interface

Benefit of SDN:

<ul>
<li>Decoupling Control and Data planes involves leaving the data plane with network hardware and moving the control plane into a software layer. </li>
<li>By abstracting the network from the hardware, policies no longer have to be executed on the hardware itself. </li>
<li>Instead, the use of a centralized software application functioning as the control plane makes network virtualization possible. </li>
</ul>

I am very new to SDN and want to know just a basic understanding of it so that I can explain to some simple what it is. From what I know that the architecture is broken into the three layers. The infrastructure layer is just the switches and routers, and other devices that makes up a network. The controller layer maps how the devices are connected and how forwarding of packets should be sent from one device to another. For the controller layer to actually do the work in mapping and knowing how to forward the packets, the application layer provides the logic to do so and this is the layer where you create your network application in certain programming language like Python. Did I get a basic understanding of how SDN layers work?

SDN architecture understanding

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我是SDN的新手，只想知道它的基本理解，这样我就可以向一些简单的解释它是什么。据我所知，架构分为三层。基础架构层只是交换机和路由器，以及组成网络的其他设备。控制器层映射设备的连接方式，以及应如何将数据包从一台设备发送到另一台设备。为了让控制器层实际执行映射和知道如何转发数据包的工作，应用程序层提供了执行此操作的逻辑，这...

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