diff --git a/neutron/db/dhcp_rpc_base.py b/neutron/db/dhcp_rpc_base.py
index 5953be13673..bf7a3d07ef3 100644
--- a/neutron/db/dhcp_rpc_base.py
+++ b/neutron/db/dhcp_rpc_base.py
@@ -14,7 +14,6 @@
 # limitations under the License.
 
 from oslo.config import cfg
-from sqlalchemy.orm import exc
 
 from neutron.api.v2 import attributes
 from neutron.common import constants
@@ -138,8 +137,8 @@ class DhcpRpcCallbackMixin(object):
                 retval = plugin.update_port(context, port['id'],
                                             dict(port=port))
 
-        except exc.NoResultFound:
-            pass
+        except n_exc.NotFound as e:
+            LOG.warning(e)
 
         if retval is None:
             # No previous port exists, so create a new one.
diff --git a/neutron/tests/unit/test_db_rpc_base.py b/neutron/tests/unit/test_db_rpc_base.py
index 9e7a3e87b8d..e9f4a78be1a 100644
--- a/neutron/tests/unit/test_db_rpc_base.py
+++ b/neutron/tests/unit/test_db_rpc_base.py
@@ -80,7 +80,10 @@ class TestDhcpRpcCallackMixin(base.BaseTestCase):
             self.plugin.get_ports.return_value = [port_retval]
         else:
             self.plugin.get_ports.return_value = []
-        self.plugin.update_port.return_value = update_port
+        if isinstance(update_port, n_exc.NotFound):
+            self.plugin.update_port.side_effect = update_port
+        else:
+            self.plugin.update_port.return_value = update_port
         self.plugin.create_port.return_value = create_port
 
         retval = self.callbacks.get_dhcp_port(mock.Mock(),
@@ -135,7 +138,7 @@ class TestDhcpRpcCallackMixin(base.BaseTestCase):
         self._test_get_dhcp_port_with_failures(
             raise_create_port=n_exc.SubnetNotFound(subnet_id='b'))
 
-    def test_get_dhcp_port_create_new(self):
+    def _test_get_dhcp_port_create_new(self, update_port=None):
         self.plugin.get_network.return_value = dict(tenant_id='tenantid')
         create_spec = dict(tenant_id='tenantid', device_id='devid',
                            network_id='netid', name='',
@@ -153,10 +156,18 @@ class TestDhcpRpcCallackMixin(base.BaseTestCase):
             mock.call.create_port(mock.ANY, dict(port=create_spec))]
 
         retval = self._test_get_dhcp_port_helper(None, expectations,
+                                                 update_port=update_port,
                                                  create_port=create_retval)
         self.assertEqual(create_retval, retval)
         self.assertEqual(len(self.log.mock_calls), 2)
 
+    def test_get_dhcp_port_create_new(self):
+        self._test_get_dhcp_port_create_new()
+
+    def test_get_dhcp_port_create_new_with_failure_on_port_update(self):
+        self._test_get_dhcp_port_create_new(
+            update_port=n_exc.PortNotFound(port_id='foo'))
+
     def test_release_dhcp_port(self):
         port_retval = dict(id='port_id', fixed_ips=[dict(subnet_id='a')])
         self.plugin.get_ports.return_value = [port_retval]