diff --git a/vmware_nsx/tests/unit/nsx_v/test_plugin.py b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
index 25dd9e696c..787ddbee29 100644
--- a/vmware_nsx/tests/unit/nsx_v/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
@@ -3290,6 +3290,9 @@ class TestVdrTestCase(L3NatTest, L3NatTestCaseBase,
     def test_floatingip_multi_external_one_internal(self):
         self.skipTest('skipped')
 
+    def test_router_add_interface_dup_subnet2_returns_400(self):
+        self.skipTest('skipped')
+
     def test_floatingip_same_external_and_internal(self):
         self.skipTest('skipped')
 
diff --git a/vmware_nsx/tests/unit/nsx_v3/test_plugin.py b/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
index c30cdb6bb2..abcb4a749c 100644
--- a/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
@@ -511,6 +511,12 @@ class TestL3NatTestCase(L3NatTest,
     def test_floatingip_with_invalid_create_port(self):
         self._test_floatingip_with_invalid_create_port(self._plugin_name)
 
+    def test_router_add_interface_dup_subnet2_returns_400(self):
+        self.skipTest('not supported')
+
+    def test_router_add_interface_ipv6_port_existing_network_returns_400(self):
+        self.skipTest('not supported')
+
     def test_routes_update_for_multiple_routers(self):
         self.skipTest('not supported')