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diff --git a/custom/topo-2sw-2host.py b/custom/topo-2sw-2host.py
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+"""Custom topology example
+
+Two directly connected switches plus a host for each switch:
+
+ host --- switch --- switch --- host
+
+Adding the 'topos' dict with a key/value pair to generate our newly defined
+topology enables one to pass in '--topo=mytopo' from the command line.
+"""
+
+from mininet.topo import Topo
+
+class MyTopo( Topo ):
+ "Simple topology example."
+
+ def __init__( self ):
+ "Create custom topo."
+
+ # Initialize topology
+ Topo.__init__( self )
+
+ # Add hosts and switches
+ leftHost = self.addHost( 'h1' )
+ rightHost = self.addHost( 'h2' )
+ leftSwitch = self.addSwitch( 's3' )
+ rightSwitch = self.addSwitch( 's4' )
+
+ # Add links
+ self.addLink( leftHost, leftSwitch )
+ self.addLink( leftSwitch, rightSwitch )
+ self.addLink( rightSwitch, rightHost )
+
+
+topos = { 'mytopo': ( lambda: MyTopo() ) }