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diff --git a/tutorial/ovn/env4/setup.sh b/tutorial/ovn/env4/setup.sh
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+#!/bin/bash
+#
+# 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.
+#
+
+# This script simulates 2 chassis connected to a physical switch,
+# which we call "physnet1". We have two logical ports, one on each hypervisor,
+# that OVN will connect to physnet1.
+#
+# The way to accomplish this in OVN is to create a logical switch for each
+# logical port.  In addition to the normal logical port, each logical switch
+# has a special "localnet" port, which represents the connection to physnet1.
+#
+# In this setup we see the view of this environment from one of the hypervisors.
+
+set -o xtrace
+
+ovs-vsctl add-br br-eth1
+ovs-vsctl set open .  external-ids:ovn-bridge-mappings=physnet1:br-eth1
+
+ovn-sbctl chassis-add fakechassis geneve 127.0.0.1
+
+for n in 1 2 3 4; do
+    ovn-nbctl ls-add provnet1-$n
+
+    ovn-nbctl lsp-add provnet1-$n provnet1-$n-port1
+    ovn-nbctl lsp-set-addresses provnet1-$n-port1 00:00:00:00:00:0$n
+    ovn-nbctl lsp-set-port-security provnet1-$n-port1 00:00:00:00:00:0$n
+
+    ovn-nbctl lsp-add provnet1-$n provnet1-$n-physnet1
+    ovn-nbctl lsp-set-addresses provnet1-$n-physnet1 unknown
+    ovn-nbctl lsp-set-type provnet1-$n-physnet1 localnet
+    ovn-nbctl lsp-set-options provnet1-$n-physnet1 network_name=physnet1
+done
+
+ovs-vsctl add-port br-int lport1 -- set Interface lport1 external_ids:iface-id=provnet1-1-port1
+ovs-vsctl add-port br-int lport2 -- set Interface lport2 external_ids:iface-id=provnet1-2-port1
+
+ovn-sbctl lsp-bind provnet1-3-port1 fakechassis
+ovn-sbctl lsp-bind provnet1-4-port1 fakechassis