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from mininet.topo import Topo
from mininet.net import Mininet
from mininet.cli import CLI

class CustomTopology(Topo):
    def build(self):
        switch1 = self.addSwitch('s1')
        switch2 = self.addSwitch('s2')
        host1 = self.addHost('h1')
        host2 = self.addHost('h2')
        host3 = self.addHost('h3')
        self.addLink(switch1, host1)
        self.addLink(switch1, host2)
        self.addLink(switch2, host3)
        self.addLink(switch1, switch2)

topo = CustomTopology()
net = Mininet(topo)
net.start()
CLI(net)
net.stop()