script.py

import os

from mininet.cli import CLI
from mininet.log import setLogLevel
from mininet.net import Mininet
from mininet.node import Controller


class POXBridge(Controller):
        def start(self):
                "Start POX learning switch"
                cout = '/tmp/' + self.name + '.log'
                fakeways = self.params.get('fakeways', []);
                module = self.params.get('module', 'forwarding.l2_learning')
                self.pox = '%s/pox/pox.py' % os.environ['HOME']
                cmd = 'openflow.of_01 --port=%d %s' % (self.port, module)
                if fakeways:
                        cmd += ' --fakeways=' + ','.join(fakeways)
                self.cmd(self.pox, cmd + ' 1>' + cout + ' 2>' + cout + ' &')

        def stop(self):
                "Stop POX"
                self.cmd('kill %' + self.pox)


def configure_network(network):
        # Setup hosts and switch
        h1 = network.addHost('h1', ip='10.0.1.10/24', mac='00:00:00:01:10')
        h2 = network.addHost('h2', ip='10.0.1.11/24', mac='00:00:00:01:11')
        h3 = network.addHost('h3', ip='10.0.2.10/24', mac='00:00:00:02:10')
        h4 = network.addHost('h4', ip='10.0.2.11/24', mac='00:00:00:02:11')
        s1 = network.addSwitch('s1')
        s2 = network.addSwitch('s2')
        r1 = network.addSwitch('r1')

        # Add links
        network.addLink(h1, s1)
        network.addLink(h2, s1)
        network.addLink(h3, s2)
        network.addLink(h4, s2)
        network.addLink(r1, s1)
        network.addLink(r1, s2)

        c1 = network.addController('c1', controller=POXBridge, port=3366, 
                                   module='forwarding.l2_learning')
        c2 = network.addController('c2', controller=POXBridge, port=3367,
                                   module='forwarding.l3_learning', 
                                   fakeways=['10.0.1.1', '10.0.2.1'])

        network.build()

        c1.start()
        c2.start()

        s1.start([c1])
        s2.start([c1])
        r1.start([c2])

        h1.cmdPrint("ip route add 10.0.2.0/24 via 10.0.1.1")
        h2.cmdPrint("ip route add 10.0.2.0/24 via 10.0.1.1")
        h3.cmdPrint("ip route add 10.0.1.0/24 via 10.0.2.1")
        h4.cmdPrint("ip route add 10.0.1.0/24 via 10.0.2.1")

if __name__ == '__main__':
        setLogLevel('info')
        net = Mininet(build=False, controller=None)
        configure_network(net)
        net.pingAll()
        CLI(net)
        net.stop()