diff --git a/ryu/app/hub.py b/ryu/app/hub.py
new file mode 100644
index 000000000..a29478030
--- /dev/null
+++ b/ryu/app/hub.py
@@ -0,0 +1,57 @@
+# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
+#
+# 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 ryu.base import app_manager
+from ryu.controller import ofp_event
+from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
+from ryu.controller.handler import set_ev_cls
+from ryu.ofproto import ofproto_v1_3
+from ryu.lib.packet import packet
+from ryu.lib.packet import ethernet
+from ryu.lib.packet import ether_types
+
+
+class SimpleSwitch13(app_manager.RyuApp):
+    OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
+
+    def __init__(self, *args, **kwargs):
+        super(SimpleSwitch13, self).__init__(*args, **kwargs)
+        self.mac_to_port = {}
+
+    @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
+    def switch_features_handler(self, ev):
+        datapath = ev.msg.datapath
+        ofproto = datapath.ofproto
+        parser = datapath.ofproto_parser
+
+        # writing flood entry
+        match = parser.OFPMatch()
+        actions = [parser.OFPActionOutput(port=ofproto.OFPP_FLOOD)]
+        self.add_flow(datapath, 0, match, actions)
+
+    def add_flow(self, datapath, priority, match, actions, buffer_id=None):
+        ofproto = datapath.ofproto
+        parser = datapath.ofproto_parser
+
+        inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
+                                             actions)]
+        if buffer_id:
+            mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
+                                    priority=priority, match=match,
+                                    instructions=inst)
+        else:
+            mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
+                                    match=match, instructions=inst)
+        datapath.send_msg(mod)