Session 4: Coding topologies in Mininet

The commands in the previous post help us to use the in-built topologies of Mininet. We could use Python to code our own topology. Here is a sample code to the below topology-

           H1    H2    H3     H4
               \   /             \    /
                S1              S2
                    \            /
                  Controller

#!/usr/bin/python

 from mininet.net import Mininet
from mininet.node import Controller, OVSKernelSwitch, RemoteController
from mininet.cli import CLI
from mininet.log import setLogLevel, info

 def emptyNet():

     net = Mininet(controller=RemoteController, switch=OVSKernelSwitch)

     c1 = net.addController('c1', controller=RemoteController, ip="0.0.0.0", port=6633)

     h1 = net.addHost( 'h1', ip='10.1.0.1' )
    h2 = net.addHost( 'h2', ip='10.1.0.2' )
    h3 = net.addHost( 'h3', ip='10.1.0.3' )
    h4 = net.addHost( 'h4', ip='10.1.0.4' )

     s1 = net.addSwitch( 's1' )
    s2 = net.addSwitch( 's2' )

     s1.linkTo( h1 )
    s1.linkTo( h2 )
    s1.linkTo( s2 )
    s2.linkTo( h3 )
    s2.linkTo( h4 )

     net.build()
    c1.start()
    #c2.start()
    #c3.start()
    s1.start([c1])
    s2.start([c1])

     net.start()
    net.staticArp()
    CLI( net )
    net.stop()

 if __name__ == '__main__':
    setLogLevel( 'info' )
    emptyNet()

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