diff --git a/tools/test/topos/metro.py b/tools/test/topos/metro.py
new file mode 100755
index 0000000..1979b10
--- /dev/null
+++ b/tools/test/topos/metro.py
@@ -0,0 +1,217 @@
+#!/usr/bin/env python
+
+from mininet.net import Mininet
+from mininet.node import UserSwitch, DefaultController, RemoteController, Host
+from mininet.topo import Topo
+from mininet.log import setLogLevel, info
+from mininet.cli import CLI
+from mininet.link import OVSIntf
+
+from opticalUtils import LINCSwitch, LINCLink
+
+class Domain(object):
+    """
+    A container for switch, host, link, and controller information to be dumped
+    into the Mininet mid-level API.
+    """
+
+    def __init__ (self, did=0):
+        # each Domain has a numeric ID for sanity/convenience
+        self.__dId = did
+
+        # information about network elements - for calling the "mid-level" APIs
+        self.__ctrls = {}
+        self.__switches = {}
+        self.__hosts = {}
+        self.__links = {}
+        # maps of devices, hosts, and controller names to actual objects
+        self.__smap = {}
+        self.__hmap = {}
+        self.__cmap = {}
+
+    def addController(self, name, **args):
+        self.__ctrls[name] = args if args else {}
+        return name
+
+    def addSwitch(self, name, **args):
+        self.__switches[name] = args if args else {}
+        return name
+
+    def addHost(self, name, **args):
+        self.__hosts[name] = args if args else {}
+        return name
+
+    def addLink(self, src, dst, **args):
+        self.__links[(src, dst)] = args if args else {}
+        return (src, dst)
+
+    def getId( self):
+        return self.__dId
+
+    def getControllers(self, name=None):
+        return self.__cmap.values() if not name else self.__cmap.get(name)
+
+    def getSwitches(self, name=None):
+        return self.__smap.values() if not name else self.__smap.get(name)
+
+    def getHosts(self, name=None):
+        return self.__hmap.values() if not name else self.__hmap.get(name)
+
+    def injectInto(self, net):
+        """ Adds available topology info to a supplied Mininet object. """
+        # add switches, hosts, then links to mininet object
+        for sw, args in self.__switches.iteritems():
+            self.__smap[sw] = net.addSwitch(sw, **args)
+        for h, args in self.__hosts.iteritems():
+            self.__hmap[h] = net.addHost(h, **args)
+        for l, args in self.__links.iteritems():
+            src = self.__smap.get(l[0])
+            dst = self.__smap.get(l[1])
+            net.addLink(src if src else self.__hmap.get(l[0]),
+                         dst if dst else self.__hmap.get(l[1]), **args)
+        # then controllers
+        for c, args in self.__ctrls.iteritems():
+            self.__cmap[c] = net.addController(c, **args)
+
+    def start(self):
+        """ starts the switches with the correct controller. """
+        map(lambda c: c.start(), self.__cmap.values())
+        map(lambda s: s.start(self.__cmap.values()), self.__smap.values())
+
+    def build(self, *args):
+        """ override for custom topology, similar to Topo """
+        pass
+
+
+class OpticalDomain(Domain):
+    """ An emulated optical metro core. It is Domain 0. """
+    def build(self):
+        oean = { "optical.regens": 0 }
+        for i in range (1,4):
+            self.addSwitch('OE%s' % i, dpid='0000ffffffffff0%s' % i, annotations=oean, cls=LINCSwitch)
+
+        an = { "optical.waves": 80, "optical.type": "WDM", "optical.kms": 1000, "durable": "true" }
+        self.addLink('OE1', 'OE2', port1=50, port2=30, annotations=an, cls=LINCLink)
+        self.addLink('OE2', 'OE3', port1=50, port2=30, annotations=an, cls=LINCLink)
+        self.addLink('OE3', 'OE1', port1=50, port2=30, annotations=an, cls=LINCLink)
+
+class FabricDomain(Domain):
+    """
+    An emulated CO fabric, which is basically a K(n,m) bipartite graph.
+
+    Each FabricDomain should be given a unique Domain ID (did) to ensure unique
+    names and addressing.
+    """
+    def __init__(self, did):
+        Domain.__init__(self, did)
+
+    def build(self, n=2, m=3, f=2):
+        # K(n,m) in bipartite graph
+        l_nsw=[]
+        l_msw=[]
+
+        # create n spine switches
+        for sw in range(n):
+            l_nsw.append(self.addSwitch('swn%s%s' % (self.getId(), sw+1), cls=UserSwitch))
+
+        # create connection point to optical core (a leaf switch)
+        tsw = self.addSwitch('swm%s01' % self.getId(), cls=UserSwitch)
+        self.addTether(tsw, 'sw000%s' % self.getId(), '0000ffffffff000%s' % self.getId())
+        l_msw.append(tsw)
+
+        # attach f hosts to last m-1 leaves
+        for sw in range(1, m):
+            msw = self.addSwitch('swm%s0%s' % (self.getId(), sw+1), cls=UserSwitch)
+            l_msw.append(msw)
+            for h in range(f):
+                host = self.addHost('h%s%s' % (self.getId(), sw * f+h+1), cls=IpHost,
+                                    ip='10.0.%s.%s/24' % ((self.getId()+sw+1), (f+1)),
+                                    gateway='10.0.%s.254' % (self.getId()+sw+1))
+                self.addLink(host, msw)
+        # link up spines and leaves
+        for nsw in l_nsw:
+            for msw in l_msw:
+                self.addLink(nsw, msw)
+
+    def addTether(self, name, tname, tdpid):
+        """
+        add an OVS with name 'tname' and dpid 'tdpid' for connecting fabric
+        domains to the core.  name: the UserSwitch to connect the OVS to.
+        """
+        self.__tether = self.addSwitch(tname, dpid=tdpid)
+        self.addLink(tname, name, port1=1)
+
+    def getTether(self):
+        """ get connection point of this fabric to the core """
+        return self.__tether
+
+
+class IpHost(Host):
+    def __init__(self, name, gateway, *args, **kwargs):
+        super(IpHost, self).__init__(name, *args, **kwargs)
+        self.gateway = gateway
+
+    def config(self, **kwargs):
+        Host.config(self, **kwargs)
+        mtu = "ifconfig "+self.name+"-eth0 mtu 1490"
+        self.cmd(mtu)
+        self.cmd('ip route add default via %s' % self.gateway)
+
+# fixed port numbers for attachment points (APs) between CORD and metro domains
+OVS_AP=2
+OE_AP=10
+
+def setup(argv):
+    domains = []
+    ctlsets = sys.argv[1:]
+
+    # the controllers for the optical domain
+    d0 = OpticalDomain()
+    domains.append(d0)
+    ctls = ctlsets[0].split(',')
+    for i in range (len(ctls)):
+        d0.addController('c0%s' % i, controller=RemoteController, ip=ctls[i])
+
+    # the fabric domains - position 1 for domain 1, 2 for 2 ...
+    for i in range (1,len(ctlsets)):
+        f = FabricDomain(i)
+        domains.append(f)
+        ctls = ctlsets[i].split(',')
+        for j in range (len(ctls)):
+            f.addController('c%s%s' % (i,j), controller=RemoteController, ip=ctls[j])
+
+    # make/setup Mininet object
+    net = Mininet()
+    for d in domains:
+        d.build()
+        d.injectInto(net)
+
+    # connect COs to core - sort of hard-wired at this moment
+    for i in range(1,len(domains)):
+        an = { "bandwidth": 100000, "optical.type": "cross-connect", "durable": "true" }
+        net.addLink(domains[i].getTether(), d0.getSwitches('OE%s' % i),
+                    port1=OVS_AP, port2=OE_AP, speed=10000, annotations=an, cls=LINCLink)
+
+    # fire everything up
+    net.build()
+    map(lambda x: x.start(), domains)
+
+    # create a minimal copy of the network for configuring LINC.
+    cfgnet = Mininet()
+    cfgnet.switches = net.switches
+    cfgnet.links = net.links
+    cfgnet.controllers = d0.getControllers()
+    LINCSwitch.bootOE(cfgnet, d0.getSwitches())
+
+    CLI(net)
+    net.stop()
+    LINCSwitch.shutdownOE()
+
+if __name__ == '__main__':
+    setLogLevel('info')
+    import sys
+    if len(sys.argv) < 5:
+        print ("Usage: sudo -E ./metro.py ctl-set1 ... ctl-set4\n\n",
+                "Where ctl-set are comma-separated controller IP's")
+    else:
+        setup(sys.argv)