diff --git a/tempest/api/network/admin/test_external_network_extension.py b/tempest/api/network/admin/test_external_network_extension.py
new file mode 100644
index 0000000..c7fde77
--- /dev/null
+++ b/tempest/api/network/admin/test_external_network_extension.py
@@ -0,0 +1,94 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.api.network import base
+from tempest.common.utils import data_utils
+
+
+class ExternalNetworksTestJSON(base.BaseAdminNetworkTest):
+    _interface = 'json'
+
+    @classmethod
+    def setUpClass(cls):
+        super(ExternalNetworksTestJSON, cls).setUpClass()
+        cls.network = cls.create_network()
+
+    def _create_network(self, external=True):
+        post_body = {'name': data_utils.rand_name('network-')}
+        if external:
+            post_body['router:external'] = external
+        resp, body = self.admin_client.create_network(**post_body)
+        network = body['network']
+        self.assertEqual('201', resp['status'])
+        self.addCleanup(self.admin_client.delete_network, network['id'])
+        return network
+
+    def test_create_external_network(self):
+        # Create a network as an admin user specifying the
+        # external network extension attribute
+        ext_network = self._create_network()
+        # Verifies router:external parameter
+        self.assertIsNotNone(ext_network['id'])
+        self.assertTrue(ext_network['router:external'])
+
+    def test_update_external_network(self):
+        # Update a network as an admin user specifying the
+        # external network extension attribute
+        network = self._create_network(external=False)
+        self.assertFalse(network.get('router:external', False))
+        update_body = {'router:external': True}
+        resp, body = self.admin_client.update_network(network['id'],
+                                                      **update_body)
+        self.assertEqual('200', resp['status'])
+        updated_network = body['network']
+        # Verify that router:external parameter was updated
+        self.assertTrue(updated_network['router:external'])
+
+    def test_list_external_networks(self):
+        # Create external_net
+        external_network = self._create_network()
+        # List networks as a normal user and confirm the external
+        # network extension attribute is returned for those networks
+        # that were created as external
+        resp, body = self.client.list_networks()
+        self.assertEqual('200', resp['status'])
+        networks_list = [net['id'] for net in body['networks']]
+        self.assertIn(external_network['id'], networks_list)
+        self.assertIn(self.network['id'], networks_list)
+        for net in body['networks']:
+            if net['id'] == self.network['id']:
+                self.assertFalse(net['router:external'])
+            elif net['id'] == external_network['id']:
+                self.assertTrue(net['router:external'])
+
+    def test_show_external_networks_attribute(self):
+        # Create external_net
+        external_network = self._create_network()
+        # Show an external network as a normal user and confirm the
+        # external network extension attribute is returned.
+        resp, body = self.client.show_network(external_network['id'])
+        self.assertEqual('200', resp['status'])
+        show_ext_net = body['network']
+        self.assertEqual(external_network['name'], show_ext_net['name'])
+        self.assertEqual(external_network['id'], show_ext_net['id'])
+        self.assertTrue(show_ext_net['router:external'])
+        resp, body = self.client.show_network(self.network['id'])
+        self.assertEqual('200', resp['status'])
+        show_net = body['network']
+        # Verify with show that router:external is False for network
+        self.assertEqual(self.network['name'], show_net['name'])
+        self.assertEqual(self.network['id'], show_net['id'])
+        self.assertFalse(show_net['router:external'])
+
+
+class ExternalNetworksTestXML(ExternalNetworksTestJSON):
+    _interface = 'xml'