diff --git a/bin/mn b/bin/mn
index 0e9cded..71c76ec 100755
--- a/bin/mn
+++ b/bin/mn
@@ -26,7 +26,7 @@ from mininet.log import lg, LEVELS, info, debug, error
 from mininet.net import Mininet, MininetWithControlNet, VERSION
 from mininet.node import ( Host, CPULimitedHost, Controller, OVSController,
                            NOX, RemoteController, UserSwitch, OVSKernelSwitch,
-                           OVSLegacyKernelSwitch )
+                           OVSLegacyKernelSwitch, IVSSwitch )
 from mininet.link import Link, TCLink
 from mininet.topo import SingleSwitchTopo, LinearTopo, SingleSwitchReversedTopo
 from mininet.topolib import TreeTopo
@@ -45,7 +45,8 @@ TOPOS = { 'minimal': lambda: SingleSwitchTopo( k=2 ),
 SWITCHDEF = 'ovsk'
 SWITCHES = { 'user': UserSwitch,
              'ovsk': OVSKernelSwitch,
-             'ovsl': OVSLegacyKernelSwitch }
+             'ovsl': OVSLegacyKernelSwitch,
+             'ivs': IVSSwitch }
 
 HOSTDEF = 'proc'
 HOSTS = { 'proc': Host,
diff --git a/mininet/clean.py b/mininet/clean.py
index c5ef1ab..5162bf3 100755
--- a/mininet/clean.py
+++ b/mininet/clean.py
@@ -11,6 +11,7 @@ nothing irreplaceable!
 """
 
 from subprocess import Popen, PIPE
+import time
 
 from mininet.log import info
 from mininet.term import cleanUpScreens
@@ -27,10 +28,13 @@ def cleanup():
     info("*** Removing excess controllers/ofprotocols/ofdatapaths/pings/noxes"
          "\n")
     zombies = 'controller ofprotocol ofdatapath ping nox_core lt-nox_core '
-    zombies += 'ovs-openflowd ovs-controller udpbwtest mnexec'
+    zombies += 'ovs-openflowd ovs-controller udpbwtest mnexec ivs'
     # Note: real zombie processes can't actually be killed, since they
     # are already (un)dead. Then again,
     # you can't connect to them either, so they're mostly harmless.
+    # Send SIGTERM first to give processes a chance to shutdown cleanly.
+    sh( 'killall ' + zombies + ' 2> /dev/null' )
+    time.sleep(1)
     sh( 'killall -9 ' + zombies + ' 2> /dev/null' )
 
     # And kill off sudo mnexec
@@ -49,7 +53,7 @@ def cleanup():
             sh( 'dpctl deldp ' + dp )
 
     info( "***  Removing OVS datapaths" )
-    dps = sh("ovs-vsctl list-br").split( '\n' )
+    dps = sh("ovs-vsctl --timeout=1 list-br").split( '\n' )
     for dp in dps:
         if dp:
             sh( 'ovs-vsctl del-br ' + dp )
diff --git a/mininet/node.py b/mininet/node.py
index 639bae2..c51254d 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -1026,6 +1026,64 @@ class OVSSwitch( Switch ):
 OVSKernelSwitch = OVSSwitch
 
 
+class IVSSwitch(Switch):
+    """IVS virtual switch"""
+
+    def __init__( self, name, **kwargs ):
+        Switch.__init__( self, name, **kwargs )
+
+    @classmethod
+    def setup( cls ):
+        "Make sure IVS is installed"
+        pathCheck( 'ivs-ctl', 'ivs',
+                   moduleName="Indigo Virtual Switch (projectfloodlight.org)" )
+        out, err, exitcode = errRun( 'ivs-ctl show' )
+        if exitcode:
+            error( out + err +
+                   'ivs-ctl exited with code %d\n' % exitcode +
+                   '*** The openvswitch kernel module might '
+                   'not be loaded. Try modprobe openvswitch.\n' )
+            exit( 1 )
+
+    def start( self, controllers ):
+        "Start up a new IVS switch"
+        args = ['ivs']
+        args.extend( ['--name', self.name] )
+        args.extend( ['--dpid', self.dpid] )
+        args.extend( ['--verbose'] )
+        for intf in self.intfs.values():
+            if not intf.IP():
+                args.extend( ['-i', intf.name] )
+        for c in controllers:
+            args.extend( ['-c', '%s:%d' % (c.IP(), c.port)] )
+        if self.listenPort:
+            args.extend( ['--listen', '127.0.0.1:%i' % self.listenPort] )
+
+        logfile = '/tmp/ivs.%s.log' % self.name
+
+        self.cmd( ' '.join(args) + ' >' + logfile + ' 2>&1 </dev/null &' )
+
+    def stop( self ):
+        "Terminate IVS switch."
+        self.cmd( 'kill %ivs' )
+        self.deleteIntfs()
+
+    def attach( self, intf ):
+        "Connect a data port"
+        self.cmd( 'ivs-ctl', 'add-port', '--datapath', self.name, intf )
+
+    def detach( self, intf ):
+        "Disconnect a data port"
+        self.cmd( 'ivs-ctl', 'del-port', '--datapath', self.name, intf )
+
+    def dpctl( self, *args ):
+        "Run dpctl command"
+        if not self.listenPort:
+            return "can't run dpctl without passive listening port"
+        return self.cmd( 'ovs-ofctl ' + ' '.join( args ) +
+                         ' tcp:127.0.0.1:%i' % self.listenPort )
+
+
 class Controller( Node ):
     """A Controller is a Node that is running (or has execed?) an
        OpenFlow controller."""
diff --git a/mininet/test/test_hifi.py b/mininet/test/test_hifi.py
index ace7bb5..e881f3a 100755
--- a/mininet/test/test_hifi.py
+++ b/mininet/test/test_hifi.py
@@ -6,14 +6,12 @@
 import unittest
 
 from mininet.net import Mininet
-from mininet.node import OVSKernelSwitch
+from mininet.node import OVSKernelSwitch, UserSwitch, IVSSwitch
 from mininet.node import CPULimitedHost
 from mininet.link import TCLink
 from mininet.topo import Topo
 from mininet.log import setLogLevel
 
-
-SWITCH = OVSKernelSwitch
 # Number of hosts for each test
 N = 2
 
@@ -32,14 +30,16 @@ class SingleSwitchOptionsTopo(Topo):
             self.addLink(host, switch)
 
 
-class testOptionsTopo( unittest.TestCase ):
-    "Verify ability to create networks with host and link options."
+class testOptionsTopoCommon( object ):
+    "Verify ability to create networks with host and link options (common code)."
+
+    switchClass = None # overridden in subclasses
 
     def runOptionsTopoTest( self, n, hopts=None, lopts=None ):
         "Generic topology-with-options test runner."
         mn = Mininet( topo=SingleSwitchOptionsTopo( n=n, hopts=hopts,
                                                     lopts=lopts ),
-                      host=CPULimitedHost, link=TCLink )
+                      host=CPULimitedHost, link=TCLink, switch=self.switchClass )
         dropped = mn.run( mn.ping )
         self.assertEqual( dropped, 0 )
 
@@ -58,7 +58,7 @@ class testOptionsTopo( unittest.TestCase ):
         #self.runOptionsTopoTest( N, hopts=hopts )
 
         mn = Mininet( SingleSwitchOptionsTopo( n=N, hopts=hopts ),
-                      host=CPULimitedHost )
+                      host=CPULimitedHost, switch=self.switchClass )
         mn.start()
         results = mn.runCpuLimitTest( cpu=CPU_FRACTION )
         mn.stop()
@@ -73,7 +73,7 @@ class testOptionsTopo( unittest.TestCase ):
         lopts = { 'bw': BW, 'use_htb': True }
         # Also verify correctness of limit limitng within a bound.
         mn = Mininet( SingleSwitchOptionsTopo( n=N, lopts=lopts ),
-                      link=TCLink )
+                      link=TCLink, switch=self.switchClass )
         bw_strs = mn.run( mn.iperf )
         for bw_str in bw_strs:
             bw = float( bw_str.split(' ')[0] )
@@ -85,7 +85,7 @@ class testOptionsTopo( unittest.TestCase ):
         DELAY_TOLERANCE = 0.8  # Delay fraction below which test should fail
         lopts = { 'delay': '%sms' % DELAY_MS, 'use_htb': True }
         mn = Mininet( SingleSwitchOptionsTopo( n=N, lopts=lopts ),
-                      link=TCLink )
+                      link=TCLink, switch=self.switchClass )
         ping_delays = mn.run( mn.pingFull )
         test_outputs = ping_delays[0]
         # Ignore unused variables below
@@ -105,7 +105,7 @@ class testOptionsTopo( unittest.TestCase ):
         REPS = 1
         lopts = { 'loss': LOSS_PERCENT, 'use_htb': True }
         mn = Mininet( topo=SingleSwitchOptionsTopo( n=N, lopts=lopts ),
-                      host=CPULimitedHost, link=TCLink )
+                      host=CPULimitedHost, link=TCLink, switch=self.switchClass )
         # Drops are probabilistic, but the chance of no dropped packets is
         # 1 in 100 million with 4 hops for a link w/99% loss.
         dropped_total = 0
@@ -121,6 +121,17 @@ class testOptionsTopo( unittest.TestCase ):
         hopts = { 'cpu': 0.5 / N }
         self.runOptionsTopoTest( N, hopts=hopts, lopts=lopts )
 
+class testOptionsTopoOVSKernel( testOptionsTopoCommon, unittest.TestCase ):
+    "Verify ability to create networks with host and link options (OVS kernel switch)."
+    switchClass = OVSKernelSwitch
+
+class testOptionsTopoIVS( testOptionsTopoCommon, unittest.TestCase ):
+    "Verify ability to create networks with host and link options (IVS switch)."
+    switchClass = IVSSwitch
+
+class testOptionsTopoUserspace( testOptionsTopoCommon, unittest.TestCase ):
+    "Verify ability to create networks with host and link options (Userspace switch)."
+    switchClass = UserSwitch
 
 if __name__ == '__main__':
     setLogLevel( 'warning' )
diff --git a/mininet/test/test_nets.py b/mininet/test/test_nets.py
index fde8e87..027bdd4 100755
--- a/mininet/test/test_nets.py
+++ b/mininet/test/test_nets.py
@@ -7,42 +7,63 @@ import unittest
 
 from mininet.net import Mininet
 from mininet.node import Host, Controller
-from mininet.node import UserSwitch, OVSKernelSwitch
+from mininet.node import UserSwitch, OVSKernelSwitch, IVSSwitch
 from mininet.topo import SingleSwitchTopo, LinearTopo
 from mininet.log import setLogLevel
 
-SWITCHES = { 'user': UserSwitch,
-             'ovsk': OVSKernelSwitch,
-}
 
+class testSingleSwitchCommon( object ):
+    "Test ping with single switch topology (common code)."
 
-class testSingleSwitch( unittest.TestCase ):
-    "For each datapath type, test ping with single switch topologies."
+    switchClass = None # overridden in subclasses
 
     def testMinimal( self ):
-        "Ping test with both datapaths on minimal topology"
-        for switch in SWITCHES.values():
-            mn = Mininet( SingleSwitchTopo(), switch, Host, Controller )
-            dropped = mn.run( mn.ping )
-            self.assertEqual( dropped, 0 )
+        "Ping test on minimal topology"
+        mn = Mininet( SingleSwitchTopo(), self.switchClass, Host, Controller )
+        dropped = mn.run( mn.ping )
+        self.assertEqual( dropped, 0 )
 
     def testSingle5( self ):
-        "Ping test with both datapaths on 5-host single-switch topology"
-        for switch in SWITCHES.values():
-            mn = Mininet( SingleSwitchTopo( k=5 ), switch, Host, Controller )
-            dropped = mn.run( mn.ping )
-            self.assertEqual( dropped, 0 )
+        "Ping test on 5-host single-switch topology"
+        mn = Mininet( SingleSwitchTopo( k=5 ), self.switchClass, Host, Controller )
+        dropped = mn.run( mn.ping )
+        self.assertEqual( dropped, 0 )
+
+class testSingleSwitchOVSKernel( testSingleSwitchCommon, unittest.TestCase ):
+    "Test ping with single switch topology (OVS kernel switch)."
+    switchClass = OVSKernelSwitch
+
+class testSingleSwitchIVS( testSingleSwitchCommon, unittest.TestCase ):
+    "Test ping with single switch topology (IVS switch)."
+    switchClass = IVSSwitch
+
+class testSingleSwitchUserspace( testSingleSwitchCommon, unittest.TestCase ):
+    "Test ping with single switch topology (Userspace switch)."
+    switchClass = UserSwitch
 
 
-class testLinear( unittest.TestCase ):
-    "For each datapath type, test all-pairs ping with LinearNet."
+class testLinearCommon( object ):
+    "Test all-pairs ping with LinearNet (common code)."
+
+    switchClass = None # overridden in subclasses
 
     def testLinear5( self ):
-        "Ping test with both datapaths on a 5-switch topology"
-        for switch in SWITCHES.values():
-            mn = Mininet( LinearTopo( k=5 ), switch, Host, Controller )
-            dropped = mn.run( mn.ping )
-            self.assertEqual( dropped, 0 )
+        "Ping test on a 5-switch topology"
+        mn = Mininet( LinearTopo( k=5 ), self.switchClass, Host, Controller )
+        dropped = mn.run( mn.ping )
+        self.assertEqual( dropped, 0 )
+
+class testLinearOVSKernel( testLinearCommon, unittest.TestCase ):
+    "Test all-pairs ping with LinearNet (OVS kernel switch)."
+    switchClass = OVSKernelSwitch
+
+class testLinearIVS( testLinearCommon, unittest.TestCase ):
+    "Test all-pairs ping with LinearNet (IVS switch)."
+    switchClass = IVSSwitch
+
+class testLinearUserspace( testLinearCommon, unittest.TestCase ):
+    "Test all-pairs ping with LinearNet (Userspace switch)."
+    switchClass = UserSwitch
 
 
 if __name__ == '__main__':
diff --git a/util/install.sh b/util/install.sh
index 0521612..136c8fa 100755
--- a/util/install.sh
+++ b/util/install.sh
@@ -84,10 +84,9 @@ OVS_RELEASE=1.4.0
 OVS_PACKAGE_LOC=https://github.com/downloads/mininet/mininet
 OVS_BUILDSUFFIX=-ignore # was -2
 OVS_PACKAGE_NAME=ovs-$OVS_RELEASE-core-$DIST_LC-$RELEASE-$ARCH$OVS_BUILDSUFFIX.tar
-OVS_SRC=$BUILD_DIR/openvswitch
 OVS_TAG=v$OVS_RELEASE
-OVS_BUILD=$OVS_SRC/build-$KERNEL_NAME
-OVS_KMODS=($OVS_BUILD/datapath/linux/{openvswitch_mod.ko,brcompat_mod.ko})
+
+IVS_TAG=v0.3
 
 # Command-line versions overrides that simplify custom VM creation
 # To use, pass in the vars on the cmd line before install.sh, e.g.
@@ -95,6 +94,7 @@ OVS_KMODS=($OVS_BUILD/datapath/linux/{openvswitch_mod.ko,brcompat_mod.ko})
 WS_DISSECTOR_REV=${WS_DISSECTOR_REV:-""}
 OF13_SWITCH_REV=${OF13_SWITCH_REV:-""}
 
+
 function kernel {
     echo "Install Mininet-compatible kernel if necessary"
     sudo apt-get update
@@ -287,6 +287,10 @@ function wireshark {
 function ovs {
     echo "Installing Open vSwitch..."
 
+    OVS_SRC=$BUILD_DIR/openvswitch
+    OVS_BUILD=$OVS_SRC/build-$KERNEL_NAME
+    OVS_KMODS=($OVS_BUILD/datapath/linux/{openvswitch_mod.ko,brcompat_mod.ko})
+
     # Required for module build/dkms install
     $install $KERNEL_HEADERS
 
@@ -399,6 +403,22 @@ function remove_ovs {
     echo "Done removing OVS"
 }
 
+function ivs {
+    echo "Installing Indigo Virtual Switch..."
+
+    IVS_SRC=$BUILD_DIR/ivs
+
+    # Install dependencies
+    $install git pkg-config gcc make libnl-3-dev libnl-route-3-dev libnl-genl-3-dev
+
+    # Install IVS from source
+    cd $BUILD_DIR
+    git clone git://github.com/floodlight/ivs $IVS_SRC -b $IVS_TAG --recursive
+    cd $IVS_SRC
+    make
+    sudo make install
+}
+
 # Install NOX with tutorial files
 function nox {
     echo "Installing NOX w/tutorial files..."
@@ -640,7 +660,7 @@ function vm_clean {
 }
 
 function usage {
-    printf '\nUsage: %s [-abcdfhkmnprtvwx03]\n\n' $(basename $0) >&2
+    printf '\nUsage: %s [-abcdfhikmnprtvwx03]\n\n' $(basename $0) >&2
 
     printf 'This install script attempts to install useful packages\n' >&2
     printf 'for Mininet. It should (hopefully) work on Ubuntu 11.10+\n' >&2
@@ -653,21 +673,22 @@ function usage {
     printf -- ' -b: install controller (B)enchmark (oflops)\n' >&2
     printf -- ' -c: (C)lean up after kernel install\n' >&2
     printf -- ' -d: (D)elete some sensitive files from a VM image\n' >&2
-    printf -- ' -f: install open(F)low\n' >&2
+    printf -- ' -e: install Mininet d(E)veloper dependencies\n' >&2
+    printf -- ' -f: install Open(F)low\n' >&2
     printf -- ' -h: print this (H)elp message\n' >&2
+    printf -- ' -i: install (I)ndigo Virtual Switch\n' >&2
     printf -- ' -k: install new (K)ernel\n' >&2
     printf -- ' -m: install Open vSwitch kernel (M)odule from source dir\n' >&2
-    printf -- ' -n: install mini(N)et dependencies + core files\n' >&2
-    printf -- ' -e: install mininet d(E)veloper dependencies\n' >&2
+    printf -- ' -n: install Mini(N)et dependencies + core files\n' >&2
     printf -- ' -p: install (P)OX OpenFlow Controller\n' >&2
     printf -- ' -r: remove existing Open vSwitch packages\n' >&2
+    printf -- ' -s <dir>: place dependency (S)ource/build trees in <dir>\n' >&2
     printf -- ' -t: complete o(T)her Mininet VM setup tasks\n' >&2
-    printf -- ' -v: install open (V)switch\n' >&2
-    printf -- ' -w: install OpenFlow (w)ireshark dissector\n' >&2
+    printf -- ' -v: install Open (V)switch\n' >&2
+    printf -- ' -w: install OpenFlow (W)ireshark dissector\n' >&2
     printf -- ' -x: install NO(X) Classic OpenFlow controller\n' >&2
     printf -- ' -0: (default) -0[fx] installs OpenFlow 1.0 versions\n' >&2
     printf -- ' -3: -3[fx] installs OpenFlow 1.3 versions\n' >&2
-    printf -- ' -i < directory >: sets the (I)nstallation directory for Mininet dependencies\n' >&2
     exit 2
 }
 
@@ -677,25 +698,29 @@ if [ $# -eq 0 ]
 then
     all
 else
-    while getopts 'abcdefhkmnprtvwx03i:' OPTION
+    while getopts 'abcdefhikmnprs:tvwx03' OPTION
     do
       case $OPTION in
       a)    all;;
       b)    cbench;;
       c)    kernel_clean;;
       d)    vm_clean;;
+      e)    mn_dev;;
       f)    case $OF_VERSION in
             1.0) of;;
             1.3) of13;;
             *)  echo "Invalid OpenFlow version $OF_VERSION";;
             esac;;
       h)    usage;;
+      i)    ivs;;
       k)    kernel;;
       m)    modprobe;;
       n)    mn_deps;;
-      e)    mn_dev;;
       p)    pox;;
       r)    remove_ovs;;
+      s)    mkdir -p $OPTARG; # ensure the directory is created
+            BUILD_DIR="$( cd -P "$OPTARG" && pwd )"; # get the full path
+            echo "Dependency installation directory: $BUILD_DIR";;
       t)    vm_other;;
       v)    ovs;;
       w)    wireshark;;
@@ -706,9 +731,6 @@ else
             esac;;
       0)    OF_VERSION=1.0;;
       3)    OF_VERSION=1.3;;
-      i)    mkdir -p $OPTARG; # ensure the directory is created
-            BUILD_DIR="$( cd -P "$OPTARG" && pwd )"; # get the full path of the directory
-            echo "Dependency installation directory: $BUILD_DIR";;
       ?)    usage;;
       esac
     done