2019 SDN上机第4次作业

用Python脚本搭建如下拓扑：

from mininet.topo import Topo
class Mytopo(Topo):
    def __init__(self):
        Topo.__init__(self)
        sw=self.addSwitch('s1')
        h1=self.addHost('h1')
    h2=self.addHost('h2')
        h3=self.addHost('h3')
    self.addLink(sw,h1)
        self.addLink(sw,h2)
    self.addLink(sw,h3)
topos = {'mytopo': (lambda:Mytopo())}

来源：https://www.cnblogs.com/xzhcode/p/11900775.html