diff --git a/apps/simplefabric/mininet-simplefabric.py b/apps/simplefabric/mininet-simplefabric.py
new file mode 100755
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+++ b/apps/simplefabric/mininet-simplefabric.py
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+#!/usr/bin/python
+# Mininet model for Simple Leaf-Spine Network
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from mininet.topo import Topo
+from mininet.net import Mininet
+from mininet.node import Host, OVSSwitch, RemoteController
+from mininet.log import setLogLevel
+from mininet.cli import CLI
+
+
+"Create custom topo."
+
+net = Mininet()
+
+# Add leaf switch and hosts in rack 1
+# subnet: 10.0.1.0/24
+s10 = net.addSwitch('s10', dpid='0000000000000011')
+h11 = net.addHost('h11', mac='00:00:10:00:01:11', ip='10.0.1.11/24', defaultRoute='via 10.0.1.1')
+h12 = net.addHost('h12', mac='00:00:10:00:01:12', ip='10.0.1.12/24', defaultRoute='via 10.0.1.1')
+h13 = net.addHost('h13', mac='00:00:10:00:01:13', ip='10.0.1.13/24', defaultRoute='via 10.0.1.1')
+h14 = net.addHost('h14', mac='00:00:10:00:01:14', ip='10.0.1.14/24', defaultRoute='via 10.0.1.1')
+d11 = net.addHost('d11', mac='00:00:10:00:01:a1', ip='10.0.1.111/24', defaultRoute='via 10.0.1.1')
+d12 = net.addHost('d12', mac='00:00:10:00:01:a2', ip='10.0.1.112/24', defaultRoute='via 10.0.1.1')
+net.addLink(s10, h11)
+net.addLink(s10, h12)
+net.addLink(s10, h13)
+net.addLink(s10, h14)
+net.addLink(s10, d11)
+net.addLink(s10, d12)
+
+# Add leaf switch and hosts in rack 2
+# subnet: 10.0.2.0/24
+s20 = net.addSwitch('s20', dpid='0000000000000012')
+h21 = net.addHost('h21', mac='00:00:10:00:02:21', ip='10.0.2.21/24', defaultRoute='via 10.0.2.1')
+h22 = net.addHost('h22', mac='00:00:10:00:02:22', ip='10.0.2.22/24', defaultRoute='via 10.0.2.1')
+h23 = net.addHost('h23', mac='00:00:10:00:02:23', ip='10.0.2.23/24', defaultRoute='via 10.0.2.1')
+h24 = net.addHost('h24', mac='00:00:10:00:02:24', ip='10.0.2.24/24', defaultRoute='via 10.0.2.1')
+d21 = net.addHost('d21', mac='00:00:10:00:02:b1', ip='10.0.2.221/24', defaultRoute='via 10.0.2.1')
+d22 = net.addHost('d22', mac='00:00:10:00:02:b2', ip='10.0.2.222/24', defaultRoute='via 10.0.2.1')
+net.addLink(s20, h21)
+net.addLink(s20, h22)
+net.addLink(s20, h23)
+net.addLink(s20, h24)
+net.addLink(s20, d21)
+net.addLink(s20, d22)
+
+# Add spine switches and nat
+# subnet: 10.0.0.0/16
+ss1 = net.addSwitch('ss1', dpid='0000000000000021')
+ss2 = net.addSwitch('ss2', dpid='0000000000000022')
+net.addLink(ss1, s10)
+net.addLink(ss1, s20)
+net.addLink(ss2, s10)
+net.addLink(ss2, s20)
+
+# Add External Router
+#h31 = net.addHost('h31', mac='00:00:10:00:00:31', ip='10.0.0.31/24', defaultRoute='via 10.0.0.1')
+#h32 = net.addHost('h32', mac='00:00:10:00:00:32', ip='10.0.0.32/24', defaultRoute='via 10.0.0.1')
+#net.addLink(ss1, h31);
+#net.addLink(ss2, h32);
+
+# Add ONOS/RemoteController; set your ONOS node ip address
+net.addController(RemoteController('c1', ip='10.10.108.140'))
+
+# Main
+setLogLevel('info')
+net.start()
+
+# reveal hosts to switches
+#for h in [h11, h12, h13, h14, d11, d12] :
+#  net.ping(hosts=[h, h31], timeout='1')
+#  net.ping(hosts=[h, h31], timeout='1')
+#for h in [h21, h22, h23, h24, d21, d22] :
+#  net.ping(hosts=[h, h32], timeout='1')
+#  net.ping(hosts=[h, h32], timeout='1')
+
+# do interactive shell
+CLI(net)
+net.stop()
+