diff --git a/dragonflow/controller/apps/provider.py b/dragonflow/controller/apps/provider.py
index 45ea0b343..a35ff119e 100644
--- a/dragonflow/controller/apps/provider.py
+++ b/dragonflow/controller/apps/provider.py
@@ -90,14 +90,17 @@ class ProviderApp(df_base_app.DFlowApp):
         self._update_bridge_mac(switch_port.name, None)
 
     def _update_bridge_mac(self, bridge, mac):
-        if bridge not in self.bridge_macs:
+        physical_network = self.reverse_bridge_mappings.get(bridge)
+        if not physical_network:
             return
 
-        old_mac = self.bridge_macs[bridge]
+        if physical_network not in self.bridge_macs:
+            return
+
+        old_mac = self.bridge_macs[physical_network]
         if old_mac == mac:
             return
 
-        physical_network = self.reverse_bridge_mappings[bridge]
         lswitch = self.db_store.get_one(
             l2.LogicalSwitch(physical_network=physical_network),
             index=l2.LogicalSwitch.get_index('physical_network'))
@@ -106,7 +109,7 @@ class ProviderApp(df_base_app.DFlowApp):
             self._remove_egress_placeholder_flow(lswitch.unique_key)
 
         if mac is not None:
-            self._egress_placeholder_flow(lswitch.unique_key)
+            self._egress_placeholder_flow(lswitch)
 
         self.bridge_macs[physical_network] = mac
 
@@ -251,12 +254,12 @@ class ProviderApp(df_base_app.DFlowApp):
         )
 
         if self.bridge_macs.get(physical_network) is not None:
-            self._egress_placeholder_flow(lport)
+            self._egress_placeholder_flow(lport.lswitch)
 
-    def _egress_placeholder_flow(self, lport):
+    def _egress_placeholder_flow(self, lswitch):
         # If dest MAC is the placeholder, update it to bridge MAC
-        network_id = lport.lswitch.unique_key
-        physical_network = lport.lswitch.physical_network
+        network_id = lswitch.unique_key
+        physical_network = lswitch.physical_network
         port_num = self.int_ofports[physical_network]
 
         self.mod_flow(
diff --git a/dragonflow/tests/unit/test_provider_net_app.py b/dragonflow/tests/unit/test_provider_net_app.py
index 1539ca886..e4d652a94 100644
--- a/dragonflow/tests/unit/test_provider_net_app.py
+++ b/dragonflow/tests/unit/test_provider_net_app.py
@@ -14,9 +14,12 @@
 #    under the License.
 
 import copy
+import mock
 
+from dragonflow.common import constants
 from dragonflow.controller.common import constants as const
 from dragonflow.db.models import l2
+from dragonflow.db.models import switch
 from dragonflow.tests.unit import test_app_base
 
 
@@ -29,7 +32,7 @@ class TestProviderNetsApp(test_app_base.DFAppTestBase):
 
     def setUp(self):
         super(TestProviderNetsApp, self).setUp()
-        fake_vlan_switch1 = l2.LogicalSwitch(
+        self.fake_vlan_switch1 = l2.LogicalSwitch(
                 network_type='vlan',
                 id='fake_vlan_switch1',
                 mtu=1454,
@@ -43,7 +46,7 @@ class TestProviderNetsApp(test_app_base.DFAppTestBase):
             test_app_base.fake_lswitch_default_subnets[0])
         fake_vlan_subnet.id = 'fake_vlan_subnet1'
         fake_vlan_subnet.lswitch = 'fake_vlan_switch1'
-        self.controller.update(fake_vlan_switch1)
+        self.controller.update(self.fake_vlan_switch1)
         self.controller.update(fake_vlan_subnet)
         self.app = self.open_flow_app.dispatcher.apps['provider']
         self.app.ofproto.OFPVID_PRESENT = 0x1000
@@ -88,3 +91,43 @@ class TestProviderNetsApp(test_app_base.DFAppTestBase):
             priority=const.PRIORITY_HIGH,
             match=match)
         self.app.mod_flow.reset_mock()
+
+    def test_provider_bridge(self):
+        self.app.int_ofports['phynet'] = 1
+        self.app.bridge_macs['phynet'] = '00:12:23:34:45:56'
+        self.app.reverse_bridge_mappings['private'] = 'phynet'
+
+        fake_local_vlan_port = make_fake_local_port(
+            lswitch='fake_vlan_switch1')
+        self.controller.update(fake_local_vlan_port)
+        self.app.mod_flow.reset_mock()
+
+        switch_port = switch.SwitchPort(
+            id='fake_switch_port', lport=fake_local_vlan_port.id,
+            port_num=1, admin_state='up', name='private',
+            mac_in_use='00:00:00:00:00:01',
+            type=constants.SWITCH_COMPUTE_INTERFACE)
+        self.controller.update(switch_port)
+
+        call_list = [
+            mock.call(
+                command=self.app.ofproto.OFPFC_DELETE,
+                table_id=const.EGRESS_EXTERNAL_TABLE,
+                priority=const.PRIORITY_HIGH,
+                match=self.app.parser.OFPMatch()),
+            mock.call(
+                table_id=const.EGRESS_EXTERNAL_TABLE,
+                priority=const.PRIORITY_HIGH,
+                match=self.app.parser.OFPMatch(),
+                inst=[self.app.parser.OFPInstructionActions()]
+            )]
+        self.assertEqual(len(call_list), self.app.mod_flow.call_count)
+        self.app.mod_flow.assert_has_calls(call_list)
+
+        self.app.mod_flow.reset_mock()
+        self.controller.delete(switch_port)
+        self.app.mod_flow.assert_called_with(
+            command=self.app.ofproto.OFPFC_DELETE,
+            table_id=const.EGRESS_EXTERNAL_TABLE,
+            priority=const.PRIORITY_HIGH,
+            match=self.app.parser.OFPMatch())