实验拓扑：
1.登录mininet
[plain] view plain copy sudo ssh -x openflow@openflow
2.启动floodlight
写一个把启动floodlight小脚本，用shell来运行
[plain] view plain copy #!/bin/sh cd /home/fei/workspace/floodlight-0.90/target java -jar floodlight.jar 终端中运行这个脚本
3.构建拓扑
[plain] view plain copy sudo mn --topo single,3 --controller=remote --ip=192.168.131.129 --port=6633
4.h2,h3,h4三个host相互ping，可以看到默认是可以拼通的，而且从每个host，第一个ping包time值比较大，可以猜测出默认转发端口是floodlight控制器
可以在floodlight包的
[plain] view plain copy src/main/resources/floodlightdefault.properties 文件中删除
[plain] view plain copy net.floodlightcontroller.forwarding.Forwarding 这一项，则默认是ping不同的
5.至此基本网络已经完成，接下来我们使用Static Flow Pusher 改变流表，让h2 ping不通h3,h4。 h3与h4能ping通，转发口使用floodlight控制器，我们设置从端口1的数据从端口1转发回去，也可以在actions域置为空，则丢弃从端口1来的包。
Python代码：
[python] view plain copy import httplib import json class StaticFlowPusher(object): def __init__(self, server): self.server = server def get(self, data): ret = self.rest_call({}, 'GET') return json.loads(ret[2]) def set(self, data): ret = self.rest_call(data, 'POST') return ret[0] == 200 def remove(self, objtype, data): ret = self.rest_call(data, 'DELETE') return ret[0] == 200 def rest_call(self, data, action): path = '/wm/staticflowentrypusher/json' headers = { 'Content-type': 'application/json', 'Accept': 'application/json', } body = json.dumps(data) conn = httplib.HTTPConnection(self.server, 8080) conn.request(action, path, body, headers) response = conn.getresponse() ret = (response.status, response.reason, response.read()) print ret conn.close() return ret pusher = StaticFlowPusher('192.168.131.129') #控制器ip flow1 = { 'switch':"00:00:00:00:00:00:00:01", "name":"flow-mod-1", "cookie":"0", "priority":"32768", "ingress-port":"1", "active":"true", "actions":"output=1" } flow2 = { 'switch':"00:00:00:00:00:00:00:01", "name":"flow-mod-2", "cookie":"0", "priority":"32768", "ingress-port":"2", "active":"true", "actions":"output=flood" } flow3 = { 'switch':"00:00:00:00:00:00:00:01", "name":"flow-mod-3", "cookie":"0", "priority":"32768", "ingress-port":"3", "active":"true", "actions":"output=flood" } #添加流表flow1，flow2，flow3 pusher.set(flow1) pusher.set(flow2) pusher.set(flow3) 运行python flow1.py，可以看到按代码添加了3个流表
在mininet执行
[plain] view plain copy dpctl dump-flows tcp:127.0.0.1:6634 查看流表，与代码一致
也可以在floodlight的web页面看到流表项
实验结果如下：
（1）h3与h4能ping通
（2）h2与h3不能ping通，当然h2与h4也是如此
下面将流表flow2，flow3项"actions":"output=flood"字段改成相应的端口，即2转发到3,3转发到2
通过ping h3，h4，可以看到第一个ping 包time值明显缩小，因为添加了直接转发的表项，而不是上面那样的经过控制器，不过跟后面的包time值还不是一个数量级，因为对控制器不是很熟悉，这些细节还有待学习。
