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85 lines
2.9 KiB
Python
85 lines
2.9 KiB
Python
5 months ago
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"Library of potentially useful topologies for Mininet"
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from mininet.topo import Topo
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from mininet.net import Mininet
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# The build() method is expected to do this:
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# pylint: disable=arguments-differ
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class TreeTopo( Topo ):
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"Topology for a tree network with a given depth and fanout."
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def build( self, depth=1, fanout=2 ):
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# Numbering: h1..N, s1..M
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self.hostNum = 1
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self.switchNum = 1
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# Build topology
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self.addTree( depth, fanout )
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def addTree( self, depth, fanout ):
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"""Add a subtree starting with node n.
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returns: last node added"""
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isSwitch = depth > 0
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if isSwitch:
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node = self.addSwitch( 's%s' % self.switchNum )
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self.switchNum += 1
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for _ in range( fanout ):
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child = self.addTree( depth - 1, fanout )
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self.addLink( node, child )
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else:
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node = self.addHost( 'h%s' % self.hostNum )
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self.hostNum += 1
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return node
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def TreeNet( depth=1, fanout=2, **kwargs ):
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"Convenience function for creating tree networks."
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topo = TreeTopo( depth, fanout )
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return Mininet( topo, **kwargs )
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class TorusTopo( Topo ):
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"""2-D Torus topology
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WARNING: this topology has LOOPS and WILL NOT WORK
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with the default controller or any Ethernet bridge
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without STP turned on! It can be used with STP, e.g.:
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# mn --topo torus,3,3 --switch lxbr,stp=1 --test pingall"""
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def build( self, x, y, n=1 ):
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"""x: dimension of torus in x-direction
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y: dimension of torus in y-direction
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n: number of hosts per switch"""
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if x < 3 or y < 3:
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raise Exception( 'Please use 3x3 or greater for compatibility '
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'with 2.1' )
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if n == 1:
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def genHostName( loc, _k ):
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return 'h%s' % ( loc )
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else:
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def genHostName( loc, k ):
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return 'h%sx%d' % ( loc, k )
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hosts, switches, dpid = {}, {}, 0
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# Create and wire interior
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for i in range( 0, x ):
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for j in range( 0, y ):
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loc = '%dx%d' % ( i + 1, j + 1 )
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# dpid cannot be zero for OVS
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dpid = ( i + 1 ) * 256 + ( j + 1 )
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switch = switches[ i, j ] = self.addSwitch(
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's' + loc, dpid='%x' % dpid )
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for k in range( 0, n ):
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host = hosts[ i, j, k ] = self.addHost(
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genHostName( loc, k + 1 ) )
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self.addLink( host, switch )
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# Connect switches
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for i in range( 0, x ):
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for j in range( 0, y ):
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sw1 = switches[ i, j ]
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sw2 = switches[ i, ( j + 1 ) % y ]
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sw3 = switches[ ( i + 1 ) % x, j ]
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self.addLink( sw1, sw2 )
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self.addLink( sw1, sw3 )
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# pylint: enable=arguments-differ
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