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 eeb41ce34b0..9d739a9230c 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
@@ -1365,20 +1365,29 @@ class OVSNeutronAgent(l2population_rpc.L2populationRpcCallBackTunnelMixin,
             self.int_ofports[physical_network] = int_ofport
             self.phys_ofports[physical_network] = phys_ofport
 
-            # 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)
+            # 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.
+            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:
                 # enable veth to pass traffic