1.创建拓扑（python脚本）

     from mininet.topo import Topo 
       class MyTopo( Topo ):
          "Simple topology example."
        def __init__( self ):
         # Initialize topology
      Topo.__init__( self )

    s1 = self.addSwitch(‘s1‘)
    s2 = self.addSwitch(‘s2‘)

    h1 = self.addHost(‘h1‘)
    h2 = self.addHost(‘h2‘)
    h3 = self.addHost(‘h3‘)
    h4 = self.addHost(‘h4‘)
    h5 = self.addHost(‘h5‘)
    h6 = self.addHost(‘h6‘)

    self.addLink(h1,s1,1,1)
    self.addLink(h2,s1,1,2)
    self.addLink(h3,s1,1,3)
    self.addLink(h4,s2,1,1)
    self.addLink(h5,s2,1,2)
    self.addLink(h6,s2,1,3)
    self.addLink(s2,s1,4,4)
    topos = { ‘mytopo‘: ( lambda: MyTopo() ) }

2.利用OVS命令下发流表，实现VLAN功能

3.利用OVS命令查看流表

s1:

s2:

4.验证性测试

5.Wireshark抓包验证