SDN第二次上机作业

1.安装floodlight

参考链接：http://www.sdnlab.com/19189.html

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

生成拓扑代码：

 from mininet.topo import Topo
class MyTopo( Topo ):
"Simple topology example."
def __init__( self ):
    "Create custom topo."
    # Initialize topology
    Topo.__init__( self )
   # Add hosts and switches
    host1 = self.addHost( 'h1' )
    host2 = self.addHost( 'h2' )
    host3 = self.addHost( 'h3' )
    switch1 = self.addSwitch( 's1' )
    switch2 = self.addSwitch( 's2' )
    switch3 = self.addSwitch( 's3' )
    switch4 = self.addSwitch( 's4' )
    # Add links
    self.addLink( host1, switch2 )
    self.addLink( host2, switch3 )
    self.addLink( host3, switch4 )
    self.addLink( switch1, switch2 )
    self.addLink( switch1, switch3 )
    self.addLink( switch1, switch4 )
    topos = { 'mytopo': ( lambda: MyTopo() ) }

运行代码：

测试连通性：

floodlight查看拓扑图：

3.利用字符界面下发流表，使得“h1”和“h2”ping不通

4.利用字符界面下发流表，通过测试“h1”和“h2”的联通性，来验证openflow的hardtime机制