diff --git a/vmware_nsx/plugins/dvs/plugin.py b/vmware_nsx/plugins/dvs/plugin.py
index e3364018a2..d1d4ea1ad6 100644
--- a/vmware_nsx/plugins/dvs/plugin.py
+++ b/vmware_nsx/plugins/dvs/plugin.py
@@ -272,6 +272,14 @@ class NsxDvsV2(addr_pair_db.AllowedAddressPairsMixin,
         network_type_set = validators.is_attr_set(network_type)
         segmentation_id = net_data.get(pnet.SEGMENTATION_ID)
         segmentation_id_set = validators.is_attr_set(segmentation_id)
+        physical_network = net_data.get(pnet.PHYSICAL_NETWORK)
+        if network_type == 'vlan':
+            bindings = nsx_db.get_network_bindings_by_vlanid_and_physical_net(
+                context.session, segmentation_id, physical_network)
+            if bindings:
+                err_msg = _("Network with that dvs-id and vlan tag already "
+                            "exists")
+                raise n_exc.InvalidInput(error_message=err_msg)
         if not context.is_admin:
             err_msg = _("Only an admin can create a DVS provider "
                         "network")
diff --git a/vmware_nsx/tests/unit/dvs/test_plugin.py b/vmware_nsx/tests/unit/dvs/test_plugin.py
index c81674b2c6..1d1b9a0049 100644
--- a/vmware_nsx/tests/unit/dvs/test_plugin.py
+++ b/vmware_nsx/tests/unit/dvs/test_plugin.py
@@ -381,3 +381,25 @@ class NeutronSimpleDvsTest(NeutronSimpleDvsTestCase):
                             'admin_state_up': True}}
         self.assertRaises(exp.BadRequest, self._plugin.create_network,
                           context.get_admin_context(), data)
+
+    def test_create_vlan_network_fail_duplicate_dvs(self):
+        params = {'provider:network_type': 'vlan',
+                  'admin_state_up': True,
+                  'name': 'test_net',
+                  'tenant_id': 'fake_tenant',
+                  'shared': False,
+                  'provider:physical_network': 'fake-moid',
+                  'provider:segmentation_id': 7,
+                  'port_security_enabled': False}
+
+        with mock.patch.object(self._plugin._dvs,
+              'add_port_group'),\
+              mock.patch.object(dvs.DvsManager,
+              'add_port_group'),\
+              mock.patch.object(dvs.DvsManager,
+              'get_dvs_moref_by_name',
+               return_value=mock.MagicMock()):
+            ctx = context.get_admin_context()
+            self._plugin.create_network(ctx, {'network': params})
+            self.assertRaises(exp.InvalidInput, self._plugin.create_network,
+                              ctx, {'network': params})