mntopo.py

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.link import TCLink
from mininet.util import custom

# Topology to be instantiated in Mininet
class MNTopo(Topo):
    "Mininet test topology"

    def __init__(self):
        "Custom Topo."

        # Initialize topo
        Topo.__init__(self)

        # Hosts and switches
        s1 = self.addSwitch('s1')
        s2 = self.addSwitch('s2')
        s3 = self.addSwitch('s3')
        s4 = self.addSwitch('s4')
        s5 = self.addSwitch('s5')
        s6 = self.addSwitch('s6')
        s7 = self.addSwitch('s7')
        client = self.addHost('client')
        server = self.addHost('server')

        # Wire receiver
        self.addLink(server, s2)

        # Wire sender
        self.addLink(client, s1)

        # Wire switches
        self.addLink(s1, s3)
        self.addLink(s1, s4)
        self.addLink(s1, s5)
        self.addLink(s1, s6)
        self.addLink(s1, s7)
        self.addLink(s2, s3)
        self.addLink(s2, s4)
        self.addLink(s2, s5)
        self.addLink(s2, s6)
        self.addLink(s2, s7)

topos = { 'mntopo': ( lambda: MNTopo() ) }