mininet / mininet / topolib.py @ ea97dea9
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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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class TreeTopo( Topo ): 
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"Topology for a tree network with a given depth and fanout."

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