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"Library of potentially useful topologies for Mininet"
from mininet.topo import Topo
from mininet.net import Mininet
# The build() method is expected to do this:
# pylint: disable=arguments-differ
class TreeTopo( Topo ):
"Topology for a tree network with a given depth and fanout."
def build( self, depth=1, fanout=2 ):
# 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.addSwitch( 's%s' % self.switchNum )
self.switchNum += 1
for _ in range( fanout ):
child = self.addTree( depth - 1, fanout )
self.addLink( node, child )
else:
node = self.addHost( '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 )
class TorusTopo( Topo ):
"""2-D Torus topology
WARNING: this topology has LOOPS and WILL NOT WORK
with the default controller or any Ethernet bridge
without STP turned on! It can be used with STP, e.g.:
# mn --topo torus,3,3 --switch lxbr,stp=1 --test pingall"""
def build( self, x, y, n=1 ):
"""x: dimension of torus in x-direction
y: dimension of torus in y-direction
n: number of hosts per switch"""
if x < 3 or y < 3:
raise Exception( 'Please use 3x3 or greater for compatibility '
'with 2.1' )
if n == 1:
genHostName = lambda loc, k: 'h%s' % ( loc )
else:
genHostName = lambda loc, k: 'h%sx%d' % ( loc, k )
hosts, switches, dpid = {}, {}, 0
# Create and wire interior
for i in range( 0, x ):
for j in range( 0, y ):
loc = '%dx%d' % ( i + 1, j + 1 )
# dpid cannot be zero for OVS
dpid = ( i + 1 ) * 256 + ( j + 1 )
switch = switches[ i, j ] = self.addSwitch(
's' + loc, dpid='%x' % dpid )
for k in range( 0, n ):
host = hosts[ i, j, k ] = self.addHost(
genHostName( loc, k + 1 ) )
self.addLink( host, switch )
# Connect switches
for i in range( 0, x ):
for j in range( 0, y ):
sw1 = switches[ i, j ]
sw2 = switches[ i, ( j + 1 ) % y ]
sw3 = switches[ ( i + 1 ) % x, j ]
self.addLink( sw1, sw2 )
self.addLink( sw1, sw3 )
# pylint: enable=arguments-differ