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#!/usr/bin/python

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import Controller, RemoteController
from mininet.cli import CLI
from mininet.log import setLogLevel

class SimpleTopo(Topo):

    dpid = 1

    def build( self ):

        # create 3 switches
        sw1 = self.addSwitch("s1", dpid++)
        sw2 = self.addSwitch("s2", dpid++)
        sw3 = self.addSwitch("s3", dpid++)

        # Link all switches to each other
        self.addLink(sw1, sw2)
        self.addLink(sw1, sw3)
        self.addLink(sw2, sw3)

        # create hosts and attach to each other
        h1 = self.addHost('h1', ip='10.1.1.1/24')
        h2 = self.addHost('h2', ip='10.1.1.2/24')

        # Link hosts
        self.addLink(h1, sw1)
        self.addLink(h2, sw2)

if __name__ == '__main__':
    topo = SimpleTopo()
    net = Mininet( topo=topo )

    net.start()
    success = net.pingAll()
    net.stop()