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#!/usr/bin/env python
from mininet.topo import Topo
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.node import RemoteController, OVSKernelSwitch
from mininet.log import setLogLevel
class TowerTopo( Topo ):
"""Create a tower topology"""
def build( self, k=4, h=6 ):
spines = []
leaves = []
hosts = []
# Create the two spine switches
spines.append(self.addSwitch('s1'))
spines.append(self.addSwitch('s2'))
# Create two links between the spine switches
self.addLink(spines[0], spines[1])
#TODO add second link between spines when multi-link topos are supported
#self.addLink(spines[0], spines[1])
# Now create the leaf switches, their hosts and connect them together
i = 1
c = 0
while i <= k:
leaves.append(self.addSwitch('s1%d' % i))
for spine in spines:
self.addLink(leaves[i-1], spine)
j = 1
while j <= h:
hosts.append(self.addHost('h%d%d' % (i, j)))
self.addLink(hosts[c], leaves[i-1])
j+=1
c+=1
i+=1
topos = { 'tower': TowerTopo }
def run():
topo = TowerTopo()
net = Mininet( topo=topo, controller=RemoteController, autoSetMacs=True )
net.start()
CLI( net )
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
run()
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