network.py

gistfile1.txt

#!/usr/bin/python

"""Custom topology example

Two directly connected switches plus a host for each switch:

   host --- switch --- switch --- host
         _/                   \_
   host /                       \ host

Adding the 'topos' dict with a key/value pair to generate our newly defined
topology enables one to pass in '--topo=mytopo' from the command line.
"""

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel
from mininet.cli import CLI

class TCPDemoTopo( Topo ):

    def __init__( self ):

        # Initialize topology
        Topo.__init__( self )

        # Add hosts and switches
        leftHost1 = self.addHost( 'h1' )
        leftHost2 = self.addHost( 'h2' )
        rightHost1 = self.addHost( 'h3' )
        rightHost2 = self.addHost( 'h4' )
        leftSwitch = self.addSwitch( 's1' )
        rightSwitch = self.addSwitch( 's2' )

        # Add links
        self.addLink( leftHost1, leftSwitch, bw=100, delay='10ms' )
        self.addLink( leftHost2, leftSwitch, bw=100, delay='10ms' )
        self.addLink( leftSwitch, rightSwitch, bw=10, delay='100ms' )
        self.addLink( rightSwitch, rightHost1, bw=100, delay='10ms' )
        self.addLink( rightSwitch, rightHost2, bw=100, delay='10ms' )

def setupTopo():

    "Create network"
    topo = TCPDemoTopo()
    net = Mininet( topo=topo, link=TCLink )
    net.start()
    print "Dumping host connections"
    dumpNodeConnections( net.hosts )
    print "Testing network connectivity"
    net.pingAll()
    CLI(net)
    net.stop()

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