old_contents: #!/usr/bin/python
  
  """
  Create a network where different switches are connected to
  different controllers, by creating a custom Switch() subclass.
  """
  
  from mininet.net import Mininet
  from mininet.node import OVSSwitch, Controller, RemoteController
  from mininet.topolib import TreeTopo
  from mininet.log import setLogLevel
  from mininet.cli import CLI
  
  setLogLevel( 'info' )
  
  # Two local and one "external" controller (which is actually c0)
  # Ignore the warning message that the remote isn't (yet) running
  c0 = Controller( 'c0', port=6633 )
  c1 = Controller( 'c1', port=6634 )
  c2 = RemoteController( 'c2', ip='127.0.0.1' )
  
  cmap = { 's1': c0, 's2': c1, 's3': c2 }
  
  class MultiSwitch( OVSSwitch ):
      "Custom Switch() subclass that connects to different controllers"
      def start( self, controllers ):
          return OVSSwitch.start( self, [ cmap[ self.name ] ] )
  
  topo = TreeTopo( depth=2, fanout=2 )
  net = Mininet( topo=topo, switch=MultiSwitch, build=False )
  for c in [ c0, c1 ]:
      net.addController(c)
  net.build()
  net.start()
  CLI( net )
  net.stop()
  
new_contents: #!/usr/bin/python
  
  """
  Create a network where different switches are connected to
  different controllers, by creating a custom Switch() subclass.
  """
  
  from mininet.net import Mininet
  from mininet.node import OVSSwitch, Controller, RemoteController
  from mininet.topolib import TreeTopo
  from mininet.log import setLogLevel
  from mininet.cli import CLI
  
  setLogLevel( 'info' )
  
  # Two local and one "external" controller (which is actually c0)
  # Ignore the warning message that the remote isn't (yet) running
  c0 = Controller( 'c0', port=6633 )
  c1 = Controller( 'c1', port=6634 )
  c2 = RemoteController( 'c2', ip='127.0.0.1', port=6633 )
  
  cmap = { 's1': c0, 's2': c1, 's3': c2 }
  
  class MultiSwitch( OVSSwitch ):
      "Custom Switch() subclass that connects to different controllers"
      def start( self, controllers ):
          return OVSSwitch.start( self, [ cmap[ self.name ] ] )
  
  topo = TreeTopo( depth=2, fanout=2 )
  net = Mininet( topo=topo, switch=MultiSwitch, build=False )
  for c in [ c0, c1 ]:
      net.addController(c)
  net.build()
  net.start()
  CLI( net )
  net.stop()
  
subject: Allow RemoteController to connect to correct port.