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HelloSDNWorld
实验环境：
Frenetic虚拟机：
实验步骤：
1.Start up a terminal window - – two are provided in the VM under Accessories: Byobu Terminal (which integrates nicely with tmux) and LXTerminal (which has graphical tabs). Either one will do.
打开一个终端。
注意，这里打开的终端，需要是Byobu Terminal或者是LXTerminal，不能是其他类型的Terminal。
2.Start up a Mininet sample network with a switch and 2 hosts:
$ sudo mn --topo=single,2 --controller=remote
使用Mininet创建有两个交换机的网络拓扑。
3.Try pinging the host h2 from the host h1:
$ h1 ping h2
Unfortunately, the ping won't work because you don't have an SDN network program in place! Press CTRL-C to stop the pinging.
交换机互ping。
注意：ping是不成功的！当看到ping失败的时候惊出冷汗，才发现是黑色幽默，ctrl+c终止ping。
4.Start up another terminal window and start up Frenetic:
$ frenetic http-controller --verbosity debug
在新的终端中打开一个controller。
我的操作是，先打开controller再创建Mininet拓扑。
未创建Mininet网络拓扑时：
创建网络拓扑，结束实验时：
5.In a third terminal window, start up the example program for the Python repeater:
$ python -m frenetic.examples.repeater
注意，请先创建Mininet拓扑。
在第三个终端，运行程序，执行Python repeater。
6.Now, back in the window running Mininet, the ping should now succeed:
mininet> h1 ping h2
Congratulations! You now have a working Software Defined Network.
再次互ping，恭喜您，在Frenetic的虚拟机中打开了SDN的大门。
2016/11/29