diff --git a/neutron/plugins/ml2/drivers/l2pop/mech_driver.py b/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
index 9bc839a453c..7e26bc93dad 100644
--- a/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
+++ b/neutron/plugins/ml2/drivers/l2pop/mech_driver.py
@@ -52,6 +52,14 @@ class L2populationMechanismDriver(api.MechanismDriver):
                                    ip_address=ip['ip_address'])
                 for ip in port['fixed_ips']]
 
+    def _remove_flooding(self, fdb_entries):
+        for network_fdb in fdb_entries.values():
+            for agent_fdb in network_fdb.get('ports', {}).values():
+                try:
+                    agent_fdb.remove(const.FLOODING_ENTRY)
+                except ValueError:
+                    pass
+
     def check_vlan_transparency(self, context):
         """L2population driver vlan transparency support."""
         return True
@@ -255,11 +263,15 @@ class L2populationMechanismDriver(api.MechanismDriver):
             l3plugin, "list_router_ids_on_host", None):
             admin_context = n_context.get_admin_context()
             port_context = context._plugin_context
-            if l3plugin.list_router_ids_on_host(
-                admin_context, agent_host, [port['device_id']]):
-                return
             fdb_entries = self._get_agent_fdb(
-                port_context, context.bottom_bound_segment, port, agent_host)
+                port_context, context.bottom_bound_segment, port, agent_host,
+                include_ha_router_ports=True)
+            if (fdb_entries and
+                l3plugin.list_router_ids_on_host(
+                    admin_context, agent_host, [port['device_id']])):
+                # NOTE(slaweq): in case this is HA router, remove unicast
+                # entries to this port but don't remove flood entry
+                self._remove_flooding(fdb_entries)
             self.L2populationAgentNotify.remove_fdb_entries(
                 self.rpc_ctx, fdb_entries)
 
@@ -310,7 +322,8 @@ class L2populationMechanismDriver(api.MechanismDriver):
         self.L2populationAgentNotify.add_fdb_entries(self.rpc_ctx,
                                                      other_fdb_entries)
 
-    def _get_agent_fdb(self, context, segment, port, agent_host):
+    def _get_agent_fdb(self, context, segment, port, agent_host,
+                       include_ha_router_ports=False):
         if not agent_host:
             return
 
@@ -338,9 +351,10 @@ class L2populationMechanismDriver(api.MechanismDriver):
                 const.FLOODING_ENTRY)
         # Notify other agents to remove fdb rules for current port
         if (port['device_owner'] != const.DEVICE_OWNER_DVR_INTERFACE and
+           (include_ha_router_ports or
             not l3_hamode_db.is_ha_router_port(context,
                                                port['device_owner'],
-                                               port['device_id'])):
+                                               port['device_id']))):
             fdb_entries = self._get_port_fdb_entries(port)
             other_fdb_entries[network_id]['ports'][agent_ip] += fdb_entries
 
diff --git a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
index 618b47f2180..972d6fb10ba 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
@@ -57,6 +57,7 @@ TEST_ROUTER_ID = 'router_id'
 
 NOTIFIER = 'neutron.plugins.ml2.rpc.AgentNotifierApi'
 DEVICE_OWNER_COMPUTE = constants.DEVICE_OWNER_COMPUTE_PREFIX + 'fake'
+DEVICE_OWNER_ROUTER_HA_INTF = constants.DEVICE_OWNER_ROUTER_HA_INTF + 'fake'
 
 
 class FakeL3PluginWithAgents(common_db_mixin.CommonDbMixin,
@@ -858,6 +859,45 @@ class TestL2PopulationRpcTestCase(test_plugin.Ml2PluginV2TestCase):
                     self.mock_fanout.assert_called_with(
                         mock.ANY, 'remove_fdb_entries', expected)
 
+    def test_update_port_down_ha_router_port(self):
+        router = self._create_ha_router()
+        directory.add_plugin(plugin_constants.L3, self.plugin)
+        with self.subnet(network=self._network, enable_dhcp=False) as snet:
+            subnet = snet['subnet']
+            router_port = self._add_router_interface(subnet, router, HOST)
+            router_port_device = 'tap' + router_port['id']
+
+            host_arg = {portbindings.HOST_ID: HOST_4, 'admin_state_up': True}
+            with self.port(subnet=snet,
+                           device_owner=DEVICE_OWNER_COMPUTE,
+                           arg_list=(portbindings.HOST_ID,),
+                           **host_arg) as port1:
+                p1 = port1['port']
+                device1 = 'tap' + p1['id']
+
+                self.callbacks.update_device_up(self.adminContext,
+                                                agent_id=HOST,
+                                                device=device1)
+                self.mock_fanout.reset_mock()
+                self.callbacks.update_device_down(self.adminContext,
+                                                  agent_id=HOST,
+                                                  device=router_port_device,
+                                                  host=HOST)
+
+                router_port_ips = [
+                    p['ip_address'] for p in router_port['fixed_ips']]
+                expected = {
+                    router_port['network_id']: {
+                        'ports': {
+                            '20.0.0.1': [
+                                l2pop_rpc.PortInfo(router_port['mac_address'],
+                                                   router_port_ips[0])]},
+                        'network_type': 'vxlan',
+                        'segment_id': 1}}
+
+                self.mock_fanout.assert_called_with(
+                    mock.ANY, 'remove_fdb_entries', expected)
+
     def test_delete_port(self):
         self._register_ml2_agents()