OpenFlow Switch v1.4.0规范是在2013年10月14号发布,规范涵盖了OpenFlow Switch各个组件的功能定义.Controller与Switch之间的通信协议Open Flow Protocol等.下文主要是基于个人理解整理的一些学习笔记,理解不到位的地方还请大家多多指教. 一.基础概念图: 首先我们先看下Open Flow Switch的整体结构,以便有一个初步的感性认识,如下图所示: 从上面架构图中,我们可以看到Open Flow Switch主要是由以下几个部

What is OpenFlow? OpenFlow is an open standard that enables researchers to run experimental protocols in the campus networks we use every day. OpenFlow is added as a feature to commercial Ethernet switches, routers and wireless access points – and pr

OpenFlow Ports是OpenFlow Switch与剩余网络之间传递Packet的网络接口.OpenFlow Switches之间通过OpenFlow Ports彼此相互逻辑连接.一个OpenFlow Switch准备了若干个可用的OpenFlow Ports用于OpenFlow processing,不过这里所说的OpenFlow Ports与传统的硬件交换机的网络接口并不是一样的概念,有些传统硬件交换机的网络接口在OpenFlow Switch里并不适用,OpenFlow Swit

List of OpenFlow Software Projects (that I know of) http://yuba.stanford.edu/~casado/of-sw.html (I am trying to keep a running list of all OpenFlow-related software projects where either the bits or the source are available online. If you know of one

An OpenFlow switch in an OpenFlow environment includes an attack determination module to collect statistical information on packet processing with respect to incoming packets to be processed in the OpenFlow switch at a predetermined period interval t

目录 文章目录 目录 OpenFlow 架构 OpenFlow 标准和规范 OpenFlow 的端口(Port) OpenFlow 的流表(Flow Table) OpenFlow 的组表(Group Table) OpenFlow 的 Meter 表 OpenFlow 的通信通道 OpenFlow 协议及相关数据结构 OpenFlow 的版本变化 OpenFlow 1.0 OpenFlow 1.1 OpenFlow 1.2 OpenFlow 1.3 OpenFlow 1.4 OpenFlow

MiniNet使用很简单,下面以下面帮助界面截图为例,简单讲述常见的几个命令即可: sudo mn --topo single,3--mac --switch ovsk--controller remotemn用于启动MiniNet.(1)--topo用于指定openflow网络拓扑,MiniNet已经为大多数应用实现了四种类型的openflow网络拓扑:tree,single,linear和minimal.缺省情况下,创建的是minimal拓扑包括四个元素:one OpenFlow kerne

一.switching hub by openflow: 用Ryu实现一个有如下功能的switching hub. • Learns the MAC address of the host connected to a port and retains it in the MAC address table.• When receiving packets addressed to a host already learned, transfers them to the port connec

过去20年中可编程网络的发展可以分为几个阶段?每个阶段的贡献是什么? Making computer networks more programmable enables innovation in network management and lowers the barrier to deploying new services. In this section, we review early work on programmable networks. We divide the his

1. 代码解析 ryu/app/example_switch_13.py: from ryu.base import app_manager from ryu.controller import ofp_event from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER from ryu.controller.handler import set_ev_cls from ryu.ofproto import of

任务目的 1. 掌握OpenFlow交换机发送Packet-in消息过程及其消息格式. 2. 掌握OpenFlow控制器发送Packet-out消息过程及其消息格式. 实验原理 Packet-In 使用Packet-In消息的目的是为了将到达OpenFlow交换机的数据包发送至OpenFlow控制器.以下2种情况即可发送Packet-In消息. 不存在与流表项一致的项目时(Table-miss),OFPR_NO_MATCH 匹配的流表项中记载的行动为"发送至OpenFlow控制器"时,

任务内容 1. 熟悉Flow-Mod消息触发场景. 2. 掌握Flow-Mod消息格式和常用字段含义. 实验原理 OpenFlow 协议支持3种消息类型:Controller-to-Switch(控制器-交换机).Asynchronous(异步)和Symmetric(对称),每一类消息又有多个子消息类型. 1. Controller-Switch(控制器-交换机)消息,这类消息由控制器发起.包括Features.Configuration.Modify-State.Read-State.Send

Software-Defined Networking Network intelligence is (logically) centralized in software-based SDN controllers network operators and administrators can programmatically configure this simplified network abstraction rather than having to hand-code tens

https://www.quora.com/What-is-the-relation-between-OpenStack-OpenDaylight-OpenFlow-and-Open-vSwitch-Are-there-other-options-in-place-of-any-of-these What is the relation between OpenStack, OpenDaylight, OpenFlow and Open vSwitch? Are there other opti

文章名称:OpenState: Programming Platform-independent Stateful OpenFlow Applications Inside the Switch OpenState:在交换机内部实现编程平台无关的带状态OpenFlow应用程序 发表时间:2018 期刊来源:ACM SIGCOMM Computer Communication Review ABSTRACT (摘要) 软件定义网络设想由中央控制器管理dumb的廉价交换机.事实上,在交换机上添加某种

注明:本文并不对openflow进行分析,本人也是略略知道这个概念,对flowvisor也只是对其API有所测试,更深的源码并未涉及,只是希望该文能对以后的flowvisor研究者提供些许帮助. 一:flowvisor简介 flowvisor是基于openflow的一个中间代理层,其目的在于对物理资源的抽象和分片,从而使得每个控制器下的slice相互隔离,从而做到网络的虚拟化.现有的openflow机制中,主要提供了虚拟交换机如open vswitch,还有控制器如POX,floodlight等

OpenFlow An open standard to innovative protocols in production networks provides a standardized hook to allow us to run experiments, without requiring vendors(供应商) to expose the internal workings of their network devices The standard communications

目录 文章目录 目录 前言 软件定义网络(SDN) 虚拟交换机(vSwitch) 为什么说云计算时代的 SDN 非常重要 OpenFlow 简介 Open vSwitch Open vSwitch 的架构 ovsdb(ovsdb-server) ovs-vswitchd(vswitchd) Datapatch(openvswitch.ko) OvS 的工具集 ovs-vsctl 常用指令 Open vSwitch 的工作原理 OpenvSwitch 的典型工作流程 Open vSwitch 的安

document.write的用处 document.write是JavaScript中对document.open所开启的文档流(document stream操作的API方法,它能够直接在文档流中写入字符串,一旦文档流已经关闭,那document.write就会重新利用document.open打开新的文档流并写入,此时原来的文档流会被清空,已渲染好的页面就会被清除,浏览器将重新构建DOM并渲染新的页面. 写入文本 下面来看看如何在利用document.write来写入脚本.先考虑如下代码:

(转自:http://blog.csdn.net/reille/article/details/7161942) 作者:reille 本博客网址:http://blog.csdn.net/reille/,转载本博客原创文章请注明出处. 本文内容概要: 代码中特殊的注释技术--TODO.FIXME和XXX的用处. 更多请关注:http://velep.com/ --------------------------------------- 前言:今天在阅读Qt  Creator的源代码时,发现一些

我们见到最简单的例子是: <div ng-repeat="link in links" ></div> 如果item的值有重复的,比如links=["1","1","2","2","3"] 那么angularjs 会报错,不允许值重复,原因是angular需要一个唯一值可以与生成的dom绑定,以便追踪. 然后这时候,track by的用处就体现出来了. <d