diff --git a/neutron/tests/tempest/api/test_trunk.py b/neutron/tests/tempest/api/test_trunk.py
index d5aa7db..3dc8f0d 100644
--- a/neutron/tests/tempest/api/test_trunk.py
+++ b/neutron/tests/tempest/api/test_trunk.py
@@ -12,11 +12,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
 from neutron.tests.tempest.api import base
+from neutron.tests.tempest import config
 
 
 def trunks_cleanup(client, trunks):
@@ -206,6 +208,85 @@
         self.assertEqual(1, len(observed_subports))
 
 
+class TrunkTestMtusJSONBase(TrunkTestJSONBase):
+
+    required_extensions = ['provider', 'trunk']
+
+    @classmethod
+    def skip_checks(cls):
+        super(TrunkTestMtusJSONBase, cls).skip_checks()
+        for ext in cls.required_extensions:
+            if not test.is_extension_enabled(ext, 'network'):
+                msg = "%s extension not enabled." % ext
+                raise cls.skipException(msg)
+
+        if any(t
+               not in config.CONF.neutron_plugin_options.available_type_drivers
+               for t in ['gre', 'vxlan']):
+            msg = "Either vxlan or gre type driver not enabled."
+            raise cls.skipException(msg)
+
+    def setUp(self):
+        super(TrunkTestMtusJSONBase, self).setUp()
+
+        # VXLAN autocomputed MTU (1450) is smaller than that of GRE (1458)
+        vxlan_kwargs = {'network_name': data_utils.rand_name('vxlan-net-'),
+                        'provider:network_type': 'vxlan'}
+        self.smaller_mtu_net = self.create_shared_network(**vxlan_kwargs)
+
+        gre_kwargs = {'network_name': data_utils.rand_name('gre-net-'),
+                      'provider:network_type': 'gre'}
+        self.larger_mtu_net = self.create_shared_network(**gre_kwargs)
+
+        self.smaller_mtu_port = self.create_port(self.smaller_mtu_net)
+        self.smaller_mtu_port_2 = self.create_port(self.smaller_mtu_net)
+        self.larger_mtu_port = self.create_port(self.larger_mtu_net)
+
+
+class TrunkTestMtusJSON(TrunkTestMtusJSONBase):
+
+    @test.idempotent_id('0f05d98e-41f5-4629-ac29-9aee269c9602')
+    def test_create_trunk_with_mtu_greater_than_subport(self):
+        subports = [{'port_id': self.smaller_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        trunk = self.client.create_trunk(self.larger_mtu_port['id'], subports)
+        self.trunks.append(trunk['trunk'])
+
+    @test.idempotent_id('2004c5c6-e557-4c43-8100-c820ad4953e8')
+    def test_add_subport_with_mtu_smaller_than_trunk(self):
+        subports = [{'port_id': self.smaller_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        trunk = self.client.create_trunk(self.larger_mtu_port['id'], None)
+        self.trunks.append(trunk['trunk'])
+
+        self.client.add_subports(trunk['trunk']['id'], subports)
+
+    @test.idempotent_id('22725101-f4bc-4e00-84ec-4e02cd7e0500')
+    def test_create_trunk_with_mtu_equal_to_subport(self):
+        subports = [{'port_id': self.smaller_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        trunk = self.client.create_trunk(self.smaller_mtu_port_2['id'],
+                                         subports)
+        self.trunks.append(trunk['trunk'])
+
+    @test.idempotent_id('175b05ae-66ad-44c7-857a-a12d16f1058f')
+    def test_add_subport_with_mtu_equal_to_trunk(self):
+        subports = [{'port_id': self.smaller_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        trunk = self.client.create_trunk(self.smaller_mtu_port_2['id'], None)
+        self.trunks.append(trunk['trunk'])
+
+        self.client.add_subports(trunk['trunk']['id'], subports)
+
+
 class TrunksSearchCriteriaTest(base.BaseSearchCriteriaTest):
 
     resource = 'trunk'
diff --git a/neutron/tests/tempest/api/test_trunk_negative.py b/neutron/tests/tempest/api/test_trunk_negative.py
index 654b497..a5ed4d5 100644
--- a/neutron/tests/tempest/api/test_trunk_negative.py
+++ b/neutron/tests/tempest/api/test_trunk_negative.py
@@ -12,6 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import testtools
+
 from oslo_utils import uuidutils
 from tempest.lib import exceptions as lib_exc
 from tempest import test
@@ -235,3 +237,35 @@
         self._create_trunk_with_network_and_parent(subports)
         self.assertRaises(lib_exc.Conflict, self.client.delete_port,
                           port['id'])
+
+
+class TrunkTestMtusJSON(test_trunk.TrunkTestMtusJSONBase):
+
+    required_extensions = (
+        ['net-mtu'] + test_trunk.TrunkTestMtusJSONBase.required_extensions)
+
+    @test.attr(type='negative')
+    @test.idempotent_id('228380ef-1b7a-495e-b759-5b1f08e3e858')
+    def test_create_trunk_with_mtu_smaller_than_subport(self):
+        subports = [{'port_id': self.larger_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        with testtools.ExpectedException(lib_exc.Conflict):
+            trunk = self.client.create_trunk(self.smaller_mtu_port['id'],
+                                             subports)
+            self.trunks.append(trunk['trunk'])
+
+    @test.attr(type='negative')
+    @test.idempotent_id('3b32bf77-8002-403e-ad01-6f4cf018daa5')
+    def test_add_subport_with_mtu_greater_than_trunk(self):
+        subports = [{'port_id': self.larger_mtu_port['id'],
+                     'segmentation_type': 'vlan',
+                     'segmentation_id': 2}]
+
+        trunk = self.client.create_trunk(self.smaller_mtu_port['id'], None)
+        self.trunks.append(trunk['trunk'])
+
+        self.assertRaises(lib_exc.Conflict,
+                          self.client.add_subports,
+                          trunk['trunk']['id'], subports)
diff --git a/neutron/tests/tempest/config.py b/neutron/tests/tempest/config.py
index f50fa39..479d909 100644
--- a/neutron/tests/tempest/config.py
+++ b/neutron/tests/tempest/config.py
@@ -22,7 +22,12 @@
     cfg.BoolOpt('specify_floating_ip_address_available',
                 default=True,
                 help='Allow passing an IP Address of the floating ip when '
-                     'creating the floating ip')]
+                     'creating the floating ip'),
+    cfg.ListOpt('available_type_drivers',
+                default=[],
+                help='List of network types available to neutron, '
+                     'e.g. vxlan,vlan,gre.'),
+]
 
 # TODO(amuller): Redo configuration options registration as part of the planned
 # transition to the Tempest plugin architecture