diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
index 5aa8eb8bde8..0431580f1da 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
@@ -1366,28 +1366,13 @@ class OVSNeutronAgent(l2population_rpc.L2populationRpcCallBackTunnelMixin,
             self.int_ofports[physical_network] = int_ofport
             self.phys_ofports[physical_network] = phys_ofport
 
-            # following drop operations are not necessary for
-            # dvr agent setup_dvr_flows. So skip it if dvr enabled
-            # the reason is for br_int it is duplicate
-            # for br_physical drop_port is dangerous because when dvr
-            # enabled the highest flow on table=0 is 2 which means
-            # basically everything will be dropped until setup_dvr_flows
-            # got executed.
+            # Drop packets from physical bridges that have not matched a higher
+            # priority flow to set a local vlan. This prevents these stray
+            # packets from being forwarded to other physical bridges which
+            # could cause a network loop in the physical network.
+            self.int_br.drop_port(in_port=int_ofport)
+
             if not self.enable_distributed_routing:
-                # These two drop flows are the root cause for the bug #1803919.
-                # And now we add a rpc check during agent start procedure. If
-                # ovs agent can not reach any neutron server, or all neutron
-                # servers are down, these flows will not be installed anymore.
-                # Bug #1803919 was fixed in that way.
-                # And as a reminder, we can not do much work on this. Because
-                # the bridge mappings can be varied. Provider (external)
-                # network can be implicitly set on any physical bridge
-                # due to the basic NORMAL flow.
-                # Different vlan range networks can also have many
-                # bridge map settings, these tenant network traffic can also be
-                # blocked by the following drop flows.
-                # block all untranslated traffic between bridges
-                self.int_br.drop_port(in_port=int_ofport)
                 br.drop_port(in_port=phys_ofport)
 
             if self.use_veth_interconnection:
diff --git a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
index 177a5a50310..67bf66a0607 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
@@ -1370,7 +1370,9 @@ class TestOvsNeutronAgent(object):
         self.assertIn('added_port_id', port_info['added'])
         self.assertNotIn('activated_port_id', port_info['added'])
 
-    def _test_setup_physical_bridges(self, port_exists=False):
+    def _test_setup_physical_bridges(self, port_exists=False,
+                                     dvr_enabled=False):
+        self.agent.enable_distributed_routing = dvr_enabled
         with mock.patch.object(ip_lib.IPDevice, "exists") as devex_fn,\
                 mock.patch.object(sys, "exit"),\
                 mock.patch.object(self.agent, 'br_phys_cls') as phys_br_cls,\
@@ -1427,8 +1429,13 @@ class TestOvsNeutronAgent(object):
                         'phy-br-eth', constants.NONEXISTENT_PEER),
                 ]
             expected_calls += [
-                mock.call.int_br.drop_port(in_port='int_ofport'),
-                mock.call.phys_br.drop_port(in_port='phy_ofport'),
+                    mock.call.int_br.drop_port(in_port='int_ofport')
+            ]
+            if not dvr_enabled:
+                expected_calls += [
+                        mock.call.phys_br.drop_port(in_port='phy_ofport')
+                ]
+            expected_calls += [
                 mock.call.int_br.set_db_attribute('Interface', 'int-br-eth',
                                                   'options',
                                                   {'peer': 'phy-br-eth'}),
@@ -1448,6 +1455,9 @@ class TestOvsNeutronAgent(object):
     def test_setup_physical_bridges_port_exists(self):
         self._test_setup_physical_bridges(port_exists=True)
 
+    def test_setup_physical_bridges_dvr_enabled(self):
+        self._test_setup_physical_bridges(dvr_enabled=True)
+
     def test_setup_physical_bridges_using_veth_interconnection(self):
         self.agent.use_veth_interconnection = True
         with mock.patch.object(ip_lib.IPDevice, "exists") as devex_fn,\