diff --git a/neutron/db/l3_hamode_db.py b/neutron/db/l3_hamode_db.py
index a8b68f55767..04384c48030 100644
--- a/neutron/db/l3_hamode_db.py
+++ b/neutron/db/l3_hamode_db.py
@@ -16,6 +16,7 @@
 import functools
 
 import netaddr
+from neutron_lib.api.definitions import provider_net as providernet
 from neutron_lib.api import validators
 from neutron_lib import constants
 from neutron_lib import exceptions as n_exc
@@ -48,7 +49,6 @@ from neutron.db.models import l3ha as l3ha_model
 from neutron.extensions import l3
 from neutron.extensions import l3_ext_ha_mode as l3_ha
 from neutron.extensions import portbindings
-from neutron.extensions import providernet
 from neutron.plugins.common import utils as p_utils
 
 
diff --git a/neutron/extensions/multiprovidernet.py b/neutron/extensions/multiprovidernet.py
index e03270910e9..f1f9e029c2f 100644
--- a/neutron/extensions/multiprovidernet.py
+++ b/neutron/extensions/multiprovidernet.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from neutron_lib.api import converters
+from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib.api import extensions
 from neutron_lib.api import validators
 from neutron_lib import constants
@@ -21,7 +22,6 @@ from neutron_lib import exceptions as nexception
 import webob.exc
 
 from neutron._i18n import _
-from neutron.extensions import providernet as pnet
 
 SEGMENTS = 'segments'
 
diff --git a/neutron/extensions/providernet.py b/neutron/extensions/providernet.py
index 5d440f35269..ae765890a28 100644
--- a/neutron/extensions/providernet.py
+++ b/neutron/extensions/providernet.py
@@ -13,53 +13,22 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron_lib.api import converters
+from neutron_lib.api.definitions import provider_net
 from neutron_lib.api import extensions
 from neutron_lib.api import validators
-from neutron_lib import constants
 from neutron_lib import exceptions as n_exc
 
 from neutron._i18n import _
 
 
-NETWORK_TYPE = 'provider:network_type'
-PHYSICAL_NETWORK = 'provider:physical_network'
-SEGMENTATION_ID = 'provider:segmentation_id'
-ATTRIBUTES = (NETWORK_TYPE, PHYSICAL_NETWORK, SEGMENTATION_ID)
-
-# Common definitions for maximum string field length
-NETWORK_TYPE_MAX_LEN = 32
-PHYSICAL_NETWORK_MAX_LEN = 64
-
-EXTENDED_ATTRIBUTES_2_0 = {
-    'networks': {
-        NETWORK_TYPE: {'allow_post': True, 'allow_put': True,
-                       'validate': {'type:string': NETWORK_TYPE_MAX_LEN},
-                       'default': constants.ATTR_NOT_SPECIFIED,
-                       'enforce_policy': True,
-                       'is_visible': True},
-        PHYSICAL_NETWORK: {'allow_post': True, 'allow_put': True,
-                           'validate': {'type:string':
-                                        PHYSICAL_NETWORK_MAX_LEN},
-                           'default': constants.ATTR_NOT_SPECIFIED,
-                           'enforce_policy': True,
-                           'is_visible': True},
-        SEGMENTATION_ID: {'allow_post': True, 'allow_put': True,
-                          'convert_to': converters.convert_to_int,
-                          'enforce_policy': True,
-                          'default': constants.ATTR_NOT_SPECIFIED,
-                          'is_visible': True},
-    }
-}
-
-
 def _raise_if_updates_provider_attributes(attrs):
     """Raise exception if provider attributes are present.
 
     This method is used for plugins that do not support
     updating provider networks.
     """
-    if any(validators.is_attr_set(attrs.get(a)) for a in ATTRIBUTES):
+    if any(validators.is_attr_set(attrs.get(a))
+           for a in provider_net.ATTRIBUTES):
         msg = _("Plugin does not support updating provider attributes")
         raise n_exc.InvalidInput(error_message=msg)
 
@@ -79,22 +48,22 @@ class Providernet(extensions.ExtensionDescriptor):
 
     @classmethod
     def get_name(cls):
-        return "Provider Network"
+        return provider_net.NAME
 
     @classmethod
     def get_alias(cls):
-        return "provider"
+        return provider_net.ALIAS
 
     @classmethod
     def get_description(cls):
-        return "Expose mapping of virtual networks to physical networks"
+        return provider_net.DESCRIPTION
 
     @classmethod
     def get_updated(cls):
-        return "2012-09-07T10:00:00-00:00"
+        return provider_net.UPDATED_TIMESTAMP
 
     def get_extended_resources(self, version):
         if version == "2.0":
-            return EXTENDED_ATTRIBUTES_2_0
+            return provider_net.RESOURCE_ATTRIBUTE_MAP
         else:
             return {}
diff --git a/neutron/extensions/segment.py b/neutron/extensions/segment.py
index b2ff822d0ee..3f2627ea704 100644
--- a/neutron/extensions/segment.py
+++ b/neutron/extensions/segment.py
@@ -16,6 +16,7 @@ import abc
 import six
 
 from neutron_lib.api import converters
+from neutron_lib.api.definitions import provider_net as providernet
 from neutron_lib.api import extensions as api_extensions
 from neutron_lib import constants
 from neutron_lib.db import constants as db_const
@@ -24,7 +25,6 @@ from neutron_lib.plugins import directory
 from neutron.api import extensions
 from neutron.api.v2 import attributes
 from neutron.api.v2 import base
-from neutron.extensions import providernet
 
 SEGMENT = 'segment'
 SEGMENTS = '%ss' % SEGMENT
diff --git a/neutron/plugins/ml2/managers.py b/neutron/plugins/ml2/managers.py
index 896f1a9a823..44012356b2b 100644
--- a/neutron/plugins/ml2/managers.py
+++ b/neutron/plugins/ml2/managers.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import provider_net as provider
 from neutron_lib.api import validators
 from neutron_lib import constants
 from neutron_lib import exceptions as exc
@@ -28,7 +29,6 @@ from neutron.db import segments_db
 from neutron.extensions import external_net
 from neutron.extensions import multiprovidernet as mpnet
 from neutron.extensions import portbindings
-from neutron.extensions import providernet as provider
 from neutron.extensions import vlantransparent
 from neutron.plugins.ml2.common import exceptions as ml2_exc
 from neutron.plugins.ml2 import driver_api as api
diff --git a/neutron/plugins/ml2/plugin.py b/neutron/plugins/ml2/plugin.py
index 1dbd7503017..0c2b32a0d5d 100644
--- a/neutron/plugins/ml2/plugin.py
+++ b/neutron/plugins/ml2/plugin.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from eventlet import greenthread
+from neutron_lib.api.definitions import provider_net
 from neutron_lib.api import validators
 from neutron_lib import constants as const
 from neutron_lib import exceptions as exc
@@ -698,7 +699,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
         except KeyError:
             segments = [network]
         for s in segments:
-            segment_type = s[provider.NETWORK_TYPE]
+            segment_type = s[provider_net.NETWORK_TYPE]
             try:
                 type_driver = self.type_manager.drivers[segment_type].obj
             except KeyError:
@@ -709,7 +710,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                 # a bad setup, it's better to be safe than sorry here. Also,
                 # several unit tests use non-existent driver types that may
                 # trigger the exception here.
-                if segment_type and s[provider.SEGMENTATION_ID]:
+                if segment_type and s[provider_net.SEGMENTATION_ID]:
                     LOG.warning(
                         _LW("Failed to determine MTU for segment "
                             "%(segment_type)s:%(segment_id)s; network "
@@ -717,12 +718,12 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                             "accurate"),
                         {
                             'segment_type': segment_type,
-                            'segment_id': s[provider.SEGMENTATION_ID],
+                            'segment_id': s[provider_net.SEGMENTATION_ID],
                             'network_id': network['id'],
                         }
                     )
             else:
-                mtu = type_driver.get_mtu(s[provider.PHYSICAL_NETWORK])
+                mtu = type_driver.get_mtu(s[provider_net.PHYSICAL_NETWORK])
                 # Some drivers, like 'local', may return None; the assumption
                 # then is that for the segment type, MTU has no meaning or
                 # unlimited, and so we should then ignore those values.
diff --git a/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py b/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
index 1e7d7079ad8..e43840d3a0e 100644
--- a/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
+++ b/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
@@ -16,6 +16,7 @@
 import collections
 from operator import attrgetter
 
+from neutron_lib.api.definitions import provider_net as providernet
 from neutron_lib import constants
 from neutron_lib import context
 import six
@@ -25,7 +26,6 @@ from neutron.db import agents_db
 from neutron.db import agentschedulers_db
 from neutron.db import common_db_mixin
 from neutron.db.network_dhcp_agent_binding import models as ndab_model
-from neutron.extensions import providernet
 from neutron.scheduler import dhcp_agent_scheduler
 from neutron.tests.common import helpers
 from neutron.tests.unit.plugins.ml2 import test_plugin
diff --git a/neutron/tests/unit/db/test_l3_hamode_db.py b/neutron/tests/unit/db/test_l3_hamode_db.py
index 94254c8802a..3eaddd3ba34 100644
--- a/neutron/tests/unit/db/test_l3_hamode_db.py
+++ b/neutron/tests/unit/db/test_l3_hamode_db.py
@@ -13,6 +13,7 @@
 # under the License.
 
 import mock
+from neutron_lib.api.definitions import provider_net as providernet
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib import exceptions as n_exc
@@ -40,7 +41,6 @@ from neutron.extensions import external_net
 from neutron.extensions import l3
 from neutron.extensions import l3_ext_ha_mode
 from neutron.extensions import portbindings
-from neutron.extensions import providernet
 from neutron.scheduler import l3_agent_scheduler
 from neutron.services.revisions import revision_plugin
 from neutron.tests.common import helpers
diff --git a/neutron/tests/unit/extensions/test_providernet.py b/neutron/tests/unit/extensions/test_providernet.py
index 1018990aad3..ab4eec1e246 100644
--- a/neutron/tests/unit/extensions/test_providernet.py
+++ b/neutron/tests/unit/extensions/test_providernet.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import mock
+from neutron_lib.api.definitions import provider_net
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib.plugins import directory
@@ -81,9 +82,9 @@ class ProvidernetExtensionTestCase(testlib_api.WebTestCase):
 
     def _prepare_net_data(self):
         return {'name': 'net1',
-                pnet.NETWORK_TYPE: 'sometype',
-                pnet.PHYSICAL_NETWORK: 'physnet',
-                pnet.SEGMENTATION_ID: 666}
+                provider_net.NETWORK_TYPE: 'sometype',
+                provider_net.PHYSICAL_NETWORK: 'physnet',
+                provider_net.SEGMENTATION_ID: 666}
 
     def _put_network_with_provider_attrs(self, ctx, expect_errors=False):
         data = self._prepare_net_data()
@@ -140,7 +141,7 @@ class ProvidernetExtensionTestCase(testlib_api.WebTestCase):
     def test_network_create_with_bad_provider_attrs_400(self):
         ctx = context.get_admin_context()
         ctx.tenant_id = 'an_admin'
-        bad_data = {pnet.SEGMENTATION_ID: "abc"}
+        bad_data = {provider_net.SEGMENTATION_ID: "abc"}
         res, _1 = self._post_network_with_bad_provider_attrs(ctx, bad_data,
                                                              True)
         self.assertEqual(web_exc.HTTPBadRequest.code, res.status_int)
diff --git a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
index f75982dcd89..1d7819d337d 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import mock
+from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib import exceptions
@@ -29,7 +30,6 @@ from neutron.db import common_db_mixin
 from neutron.db import l3_agentschedulers_db
 from neutron.db import l3_hamode_db
 from neutron.extensions import portbindings
-from neutron.extensions import providernet as pnet
 from neutron.plugins.ml2 import db as ml2_db
 from neutron.plugins.ml2 import driver_context
 from neutron.plugins.ml2.drivers.l2pop import db as l2pop_db
diff --git a/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py b/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
index eaec29bc5bd..fa7a5db3559 100644
--- a/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
+++ b/neutron/tests/unit/plugins/ml2/extensions/test_dns_integration.py
@@ -17,6 +17,7 @@ from keystoneauth1 import loading
 from keystoneauth1 import session
 import mock
 import netaddr
+from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib.plugins import directory
@@ -24,7 +25,6 @@ from oslo_utils import uuidutils
 import testtools
 
 from neutron.extensions import dns
-from neutron.extensions import providernet as pnet
 from neutron.objects import ports as port_obj
 from neutron.plugins.ml2 import config
 from neutron.plugins.ml2.extensions import dns_integration
diff --git a/neutron/tests/unit/plugins/ml2/test_plugin.py b/neutron/tests/unit/plugins/ml2/test_plugin.py
index 3ce3bc3f5b3..019101750bc 100644
--- a/neutron/tests/unit/plugins/ml2/test_plugin.py
+++ b/neutron/tests/unit/plugins/ml2/test_plugin.py
@@ -21,6 +21,7 @@ import six
 import testtools
 import webob
 
+from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib import exceptions as exc
@@ -44,7 +45,6 @@ from neutron.extensions import availability_zone as az_ext
 from neutron.extensions import external_net
 from neutron.extensions import multiprovidernet as mpnet
 from neutron.extensions import portbindings
-from neutron.extensions import providernet as pnet
 from neutron.plugins.common import constants as p_const
 from neutron.plugins.ml2.common import exceptions as ml2_exc
 from neutron.plugins.ml2 import config