SDN第二次上机作业

作业链接

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

from mininet.topo import Topo
 
class MyTopo( Topo ):
    "Simple topology example."
 
    def __init__( self ):
 
        # Initialize topology
        Topo.__init__( self )
        
        sw1 = self.addSwitch('s1')
        sw2 = self.addSwitch('s2')
        sw3 = self.addSwitch('s3')
        sw4 = self.addSwitch('s4')

        h1 = self.addHost('h1')
        h2 = self.addHost('h2')
        h3 = self.addHost('h3')

        self.addLink(h1,sw2,1,1)
        self.addLink(h2,sw3,1,1)
        self.addLink(sw2,sw1,2,1)
        self.addLink(sw3,sw1,2,2)
        self.addLink(sw1,sw4,3,1)
        self.addLink(sw4,h3,2,1)

topos = { 'mytopo': ( lambda: MyTopo() ) }

2.利用字符界面下发流表，使得'h1'和'h2' ping 不通

3.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