SDN第二次上机作业

1、安装floodlight

-参考链接：http://www.sdnlab.com/19189.html
-截图：

2、生成拓扑并连接控制器floodlight，利用控制器floodlight查看图形拓扑

-截图：
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代码：
#!/usr/bin/python

 from mininet.topo import Topo
 from mininet.net import Mininet
 from mininet.node import RemoteController,CPULimitedHost
 from mininet.link import TCLink
 from mininet.util import dumpNodeConnections

 class MyTopo( Topo ):
"Simple topology example."

def __init__( self ):
    "Create custom topo."

    # Initialize topology
    Topo.__init__( self )

    #add hosts
    host1 = self.addHost(‘h1‘)
    host2 = self.addHost(‘h2‘)
    host3 = self.addHost(‘h3‘)
    
    #add switch
    switch1 = self.addSwitch(‘s1‘)
    switch2 = self.addSwitch(‘s2‘)
    switch3 = self.addSwitch(‘s3‘) 
    switch4 = self.addSwitch(‘s4‘)
    
    #add link 
self.addLink(host1,switch2,1,1)
self.addLink(host2,switch3,1,1)
self.addLink(host3,switch4,1,1)
self.addLink(switch1,switch2,1,2)       
self.addLink(switch1,switch3,2,2)
self.addLink(switch1,switch4,3,2)
topos = { ‘mytopo‘: ( lambda: MyTopo() ) }

3、利用字符界面下发流表，使得‘h1’和‘h2’ ping 不通

-截图：
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4、利用字符界面下发流表，通过测试‘h1’和‘h3’的联通性，来验证openflow的hardtime机制

-截图：
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