# Add hosts and switches
        h1 = self.addHost('h1', ip='10.1.0.11/8')
        h2 = self.addHost('h2', ip='10.1.0.22/8')
        h3 = self.addHost('h3', ip='10.1.0.33/8')
        h4 = self.addHost('h4', ip='10.1.0.44/8)

        s1 = self.addSwitch('s1')
        s2 = self.addSwitch('s2')
        s3 = self.addSwitch('s3')
        s4 = self.addSwitch('s4')
        s5 = self.addSwitch('s5')

        # Add links
        self.addLink(h1, s1)
        self.addLink(h4, s4)
        self.addLink(h2, s5)
        self.addLink(h3, s5)
        self.addLink(s5, s2)
        self.addLink(s1, s2)
        self.addLink(s3, s2)
        self.addLink(s3, s4, bw=10, delay="30ms")