diff --git a/vmware_nsx/services/l2gateway/nsx_v/driver.py b/vmware_nsx/services/l2gateway/nsx_v/driver.py
index d22849865c..6f9705a32e 100644
--- a/vmware_nsx/services/l2gateway/nsx_v/driver.py
+++ b/vmware_nsx/services/l2gateway/nsx_v/driver.py
@@ -15,6 +15,7 @@
 #    under the License.
 
 from networking_l2gw.db.l2gateway import l2gateway_db
+from networking_l2gw.db.l2gateway import l2gateway_models as models
 from networking_l2gw.services.l2gateway.common import constants as l2gw_const
 from networking_l2gw.services.l2gateway import exceptions as l2gw_exc
 from neutron_lib import exceptions as n_exc
@@ -61,7 +62,14 @@ class NsxvL2GatewayDriver(l2gateway_db.L2GatewayMixin):
             msg = _("Only a single device is supported for one L2 gateway")
             raise n_exc.InvalidInput(error_message=msg)
 
-    def _validate_interface_list(self, interfaces):
+    def _get_l2gateway_interface(self, context, interface_name):
+        """Get all l2gateway_interfaces_by interface_name."""
+        session = context.session
+        with session.begin():
+            return session.query(models.L2GatewayInterface).filter_by(
+                interface_name=interface_name).all()
+
+    def _validate_interface_list(self, context, interfaces):
         # In NSXv, interface is mapped to a vDS VLAN port group.
         # Since HA is not supported, only one interface is expected
         if len(interfaces) != 1:
@@ -70,6 +78,11 @@ class NsxvL2GatewayDriver(l2gateway_db.L2GatewayMixin):
         if not self._nsxv.vcns.validate_network(interfaces[0]['name']):
             msg = _("Configured interface not found")
             raise n_exc.InvalidInput(error_message=msg)
+        interface = self.get_l2gateway_interfaces(context,
+                                                  interfaces[0]['name'])
+        if interface:
+            msg = _("%s is already used.") % interfaces[0]['name']
+            raise n_exc.InvalidInput(error_message=msg)
 
     def create_l2_gateway_precommit(self, context, l2_gateway):
         pass
@@ -84,7 +97,7 @@ class NsxvL2GatewayDriver(l2gateway_db.L2GatewayMixin):
         devices = gw['devices']
         self._validate_device_list(devices)
         interfaces = devices[0]['interfaces']
-        self._validate_interface_list(interfaces)
+        self._validate_interface_list(context, interfaces)
         # Create a dedicated DLR
         try:
             edge_id = self._create_l2_gateway_edge(context)
diff --git a/vmware_nsx/tests/unit/services/l2gateway/test_nsxv_driver.py b/vmware_nsx/tests/unit/services/l2gateway/test_nsxv_driver.py
index b8b6c592ad..ac70d502be 100644
--- a/vmware_nsx/tests/unit/services/l2gateway/test_nsxv_driver.py
+++ b/vmware_nsx/tests/unit/services/l2gateway/test_nsxv_driver.py
@@ -70,6 +70,7 @@ class TestL2gatewayDriver(base.BaseTestCase):
         _nsxv.vcns.validate_network.return_value = False
         self.assertRaises(n_exc.InvalidInput,
                           self.plugin._validate_interface_list,
+                          self.context,
                           fake_interfaces)
 
     @mock.patch('vmware_nsx.services.l2gateway.'
@@ -130,7 +131,7 @@ class TestL2gatewayDriver(base.BaseTestCase):
         self.plugin.create_l2_gateway(self.context, fake_l2gw_dict)
         _admin_check.assert_called_with(self.context, 'CREATE')
         val_dev.assert_called_with(fake_devices)
-        val_inter.assert_called_with(fake_interfaces)
+        val_inter.assert_called_with(self.context, fake_interfaces)
 
     @mock.patch('networking_l2gw.db.l2gateway.l2gateway_db.'
                 'L2GatewayMixin._admin_check')