2

from mininet.topo import Topo

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

def __init__( self ):
        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(s1,s2,4,4)
    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)

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

来源：https://www.cnblogs.com/Eason-Xu/p/11808287.html