diff --git a/tools/test/topos/onos.py b/tools/test/topos/onos.py
new file mode 100755
index 0000000..ba09f67
--- /dev/null
+++ b/tools/test/topos/onos.py
@@ -0,0 +1,169 @@
+#!/usr/bin/env python
+
+# TODO add onos-app-fwd to features
+# TODO check if service is running... i think this might already be done by mn
+
+from mininet.node import Controller, OVSSwitch, CPULimitedHost, RemoteController
+from mininet.net import Mininet
+from mininet.cli import CLI
+from mininet.topo import LinearTopo, Topo
+from mininet.log import setLogLevel, info, warn
+from mininet.util import quietRun, numCores
+
+from shutil import copyfile
+from os import environ, path
+from functools import partial
+import time
+from sys import argv
+from time import sleep
+
+class ONOS( Controller ):
+    #def __init__( self, name, command='/opt/onos/bin/onos-service', **kwargs ):
+    #    Controller.__init__( self, name, command=command, inNamespace=True,  **kwargs )
+    #def __init__( self, name, inNamespace=False, command='controller',
+    #          cargs='-v ptcp:%d', cdir=None, ip="127.0.0.1",
+    #          port=6633, protocol='tcp', **params ):
+    #self.command = command
+    #self.cargs = cargs
+    #self.cdir = cdir
+    #self.ip = ip
+    #self.port = port
+    #self.protocol = protocol
+    #Node.__init__( self, name, inNamespace=inNamespace,
+    #               ip=ip, **params  )
+    #self.checkListening()
+    
+    ONOS_DIR = '/opt/onos/'
+    KARAF_DIR = ONOS_DIR + 'apache-karaf-3.0.1/'
+    reactive = True
+   
+    def start( self ):
+        # switch to the non-root user because karaf gets upset otherwise
+        # TODO we should look into why.... 
+        self.sendCmd( 'sudo su - %s' % self.findUser() )
+        self.waiting = False
+
+        if self.inNamespace:
+            self.cmd( self.KARAF_DIR + 'bin/instance create %s' % self.name )
+            src  = self.KARAF_DIR + 'etc/org.apache.karaf.features.cfg'
+            dst = self.KARAF_DIR + 'instances/%s/etc/org.apache.karaf.features.cfg' % self.name
+            self.cmd( 'cp %s %s' % (src, dst) )
+            self.updateProperties( dst )
+            self.cmd( self.KARAF_DIR + 'bin/instance start %s' % self.name )
+        else:
+            # we are running in the root namespace, so let's use the root instance
+            self.cmd( 'rm -rf '+ self.KARAF_DIR + 'data/' )
+            filename = self.KARAF_DIR + 'etc/org.apache.karaf.features.cfg'
+            self.updateProperties( filename )
+            self.cmd( self.KARAF_DIR + 'bin/start' )
+
+        #TODO we should wait for startup...
+
+    def stop( self ):
+        if self.inNamespace:
+            self.cmd( '/opt/onos/apache-karaf-3.0.1/bin/instance stop %s' % self.name )
+            self.cmd( '/opt/onos/apache-karaf-3.0.1/bin/instance destroy %s' % self.name )
+        else:
+            self.cmd( self.ONOS_DIR + 'apache-karaf-3.0.1/bin/stop' )
+        self.terminate()
+
+    def updateProperties( self, filename ):
+        with open( filename, 'r+' ) as f:
+            lines = f.readlines()
+            f.seek(0)
+            f.truncate()
+            for line in lines:
+                #print '?', line,
+                if 'featuresBoot=' in line:
+                    line = line.rstrip()
+                    #print ord(line[-1]), ord(line[-2]), ord(line[-3])
+                    if self.reactive:
+                        line += ',onos-app-fwd'
+                    line += '\n'
+                    #print '!', line,
+                f.write( line )
+
+    @classmethod
+    def isAvailable( self ):
+        return quietRun( 'ls /opt/onos' )
+
+    @staticmethod
+    def findUser():
+        "Try to return logged-in (usually non-root) user"
+        try:
+            # If we're running sudo
+            return os.environ[ 'SUDO_USER' ]
+        except:
+            try:
+                # Logged-in user (if we have a tty)
+                return quietRun( 'who am i' ).split()[ 0 ]
+            except:
+                # Give up and return effective user
+                return quietRun( 'whoami' )
+ 
+
+class ControlNetwork( Topo ):
+    "Control Network Topology"
+    def __init__( self, n, dataController=ONOS, **kwargs ):
+        """n: number of data network controller nodes
+           dataController: class for data network controllers"""
+        Topo.__init__( self, **kwargs )
+        # Connect everything to a single switch
+        cs0 = self.addSwitch( 'cs0' )
+        # Add hosts which will serve as data network controllers
+        for i in range( 0, n ):
+            c = self.addHost( 'c%s' % i, cls=dataController,
+                              inNamespace=True )
+            self.addLink( c, cs0 )
+        # Connect switch to root namespace so that data network
+        # switches will be able to talk to us
+        root = self.addHost( 'root', inNamespace=False )
+        self.addLink( root, cs0 )
+
+class ONOSCluster( Controller ):
+    # TODO
+    n = 4
+   
+    def start( self ):
+        ctopo = ControlNetwork( n=self.n, dataController=ONOS )
+        self.cnet = Mininet( topo=ctopo, ipBase='192.168.123.0/24', controller=None )
+        self.cnet.addController( 'cc0', controller=Controller )
+        self.cnet.start()
+
+        self.ctrls = []
+        for host in self.cnet.hosts:
+            if isinstance( host, Controller ):
+                self.ctrls.append( host )
+                host.start()
+
+    def stop( self ):
+        self.cnet.stop()
+        
+    def clist( self ):
+        "Return list of Controller proxies for this ONOS cluster"
+        print 'controllers:', self.ctrls
+        return self.ctrls
+
+class OVSSwitchONOS( OVSSwitch ):
+    "OVS switch which connects to multiple controllers"
+    def start( self, controllers ):
+        assert len( controllers ) == 1
+        c0 = controllers[ 0 ]
+        assert type( c0 ) == ONOSCluster
+        controllers = c0.clist()
+        OVSSwitch.start( self, controllers )
+
+controllers = { 'onos': ONOS }
+switches = { 'ovso': OVSSwitchONOS }
+
+if __name__ == '__main__':
+    # Simple test for ONOS() controller class
+    setLogLevel( 'info' )
+    size = 2 if len( argv ) != 2 else int( argv[ 1 ] )
+    net = Mininet( topo=LinearTopo( size ),
+                   controller=partial( ONOSCluster, n=4 ),
+                   switch=OVSSwitchONOS )
+    net.start()
+    #waitConnected( net.switches )
+    CLI( net )
+    net.stop()