"Library of potentially useful topologies for Mininet"

from mininet.topo import Topo

from mininet.net import Mininet

class TreeTopo( Topo ):

"Topology for a tree network with a given depth and fanout."

def __init__( self, depth=1, fanout=2 ):

super( TreeTopo, self ).__init__()

# Numbering: h1..N, s1..M

self.hostNum = 1

self.switchNum = 1

# Build topology

self.addTree( depth, fanout )

def addTree( self, depth, fanout ):

"""Add a subtree starting with node n.

returns: last node added"""

isSwitch = depth > 0

if isSwitch:

node = self.add_switch( 's%s' % self.switchNum )

self.switchNum += 1

for _ in range( fanout ):

child = self.addTree( depth - 1, fanout )

self.add_link( node, child )

else:

node = self.add_host( 'h%s' % self.hostNum )

self.hostNum += 1

return node

def TreeNet( depth=1, fanout=2, **kwargs ):

"Convenience function for creating tree networks."

topo = TreeTopo( depth, fanout )

return Mininet( topo, **kwargs )