diff --git a/vmware_nsx/dhcp_meta/migration.py b/vmware_nsx/dhcp_meta/migration.py
index 2e7a0a45b5..d7ae2f081f 100644
--- a/vmware_nsx/dhcp_meta/migration.py
+++ b/vmware_nsx/dhcp_meta/migration.py
@@ -15,7 +15,7 @@
 #    under the License.
 #
 
-from neutron.extensions import external_net
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib import constants as const
 from neutron_lib import exceptions as n_exc
 from oslo_log import log as logging
@@ -114,7 +114,7 @@ class MigrationManager(object):
             reason = _("LSN already exist")
             raise p_exc.LsnMigrationConflict(net_id=network_id, reason=reason)
 
-        if network[external_net.EXTERNAL]:
+        if network[extnet_apidef.EXTERNAL]:
             reason = _("Cannot migrate an external network")
             raise n_exc.BadRequest(resource='network', msg=reason)
 
diff --git a/vmware_nsx/dhcp_meta/nsx.py b/vmware_nsx/dhcp_meta/nsx.py
index db4f9e7c1d..c453de4c6d 100644
--- a/vmware_nsx/dhcp_meta/nsx.py
+++ b/vmware_nsx/dhcp_meta/nsx.py
@@ -15,6 +15,7 @@
 #    under the License.
 #
 
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib import constants as const
 from neutron_lib import exceptions as n_exc
 from oslo_config import cfg
@@ -23,7 +24,6 @@ from oslo_utils import excutils
 
 from neutron.db import db_base_plugin_v2
 from neutron.db import l3_db
-from neutron.extensions import external_net
 
 from vmware_nsx._i18n import _
 from vmware_nsx.common import exceptions as p_exc
@@ -211,7 +211,7 @@ def handle_network_dhcp_access(plugin, context, network, action):
              {"action": action, "resource": network})
     if action == 'create_network':
         network_id = network['id']
-        if network.get(external_net.EXTERNAL):
+        if network.get(extnet_apidef.EXTERNAL):
             LOG.info("Network %s is external: no LSN to create",
                      network_id)
             return
@@ -280,7 +280,7 @@ def handle_port_metadata_access(plugin, context, port, is_delete=False):
     if is_user_port(port, check_dev_id=True):
         network_id = port["network_id"]
         network = plugin.get_network(context, network_id)
-        if network[external_net.EXTERNAL]:
+        if network[extnet_apidef.EXTERNAL]:
             LOG.info("Network %s is external: nothing to do",
                      network_id)
             return
diff --git a/vmware_nsx/plugins/nsx_mh/plugin.py b/vmware_nsx/plugins/nsx_mh/plugin.py
index 8533be683e..7502a9036f 100644
--- a/vmware_nsx/plugins/nsx_mh/plugin.py
+++ b/vmware_nsx/plugins/nsx_mh/plugin.py
@@ -15,6 +15,7 @@
 
 import uuid
 
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import port_security as psec
 from neutron_lib.api import validators
 from neutron_lib import constants
@@ -57,7 +58,6 @@ from neutron.db import portsecurity_db
 from neutron.db import quota_db  # noqa
 from neutron.db import securitygroups_db
 from neutron.extensions import allowedaddresspairs as addr_pair
-from neutron.extensions import external_net as ext_net_extn
 from neutron.extensions import extraroute
 from neutron.extensions import l3
 from neutron.extensions import multiprovidernet as mpnet
@@ -833,7 +833,7 @@ class NsxPluginV2(addr_pair_db.AllowedAddressPairsMixin,
                                 'min_id': constants.MIN_VLAN_TAG,
                                 'max_id': constants.MAX_VLAN_TAG})
                 # Network must be external
-                if not network.get(ext_net_extn.EXTERNAL):
+                if not network.get(extnet_apidef.EXTERNAL):
                     err_msg = (_("The l3_ext provide network type can be "
                                  "used with external networks only"))
             else:
@@ -949,7 +949,7 @@ class NsxPluginV2(addr_pair_db.AllowedAddressPairsMixin,
                         "network %s", net_data.get('name', '<unknown>'))
         transport_zone_config = self._convert_to_nsx_transport_zones(
             self.cluster, net_data)
-        external = net_data.get(ext_net_extn.EXTERNAL)
+        external = net_data.get(extnet_apidef.EXTERNAL)
         # NOTE(salv-orlando): Pre-generating uuid for Neutron
         # network. This will be removed once the network create operation
         # becomes an asynchronous task
diff --git a/vmware_nsx/plugins/nsx_v/plugin.py b/vmware_nsx/plugins/nsx_v/plugin.py
index e59e9983c3..e5c859bceb 100644
--- a/vmware_nsx/plugins/nsx_v/plugin.py
+++ b/vmware_nsx/plugins/nsx_v/plugin.py
@@ -17,6 +17,7 @@ from distutils import version
 import uuid
 
 import netaddr
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import extra_dhcp_opt as ext_edo
 from neutron_lib.api.definitions import network as net_def
 from neutron_lib.api.definitions import port as port_def
@@ -72,7 +73,6 @@ from neutron.db import securitygroups_db
 from neutron.db import vlantransparent_db
 from neutron.extensions import allowedaddresspairs as addr_pair
 from neutron.extensions import availability_zone as az_ext
-from neutron.extensions import external_net as ext_net_extn
 from neutron.extensions import flavors
 from neutron.extensions import l3
 from neutron.extensions import multiprovidernet as mpnet
@@ -657,7 +657,7 @@ class NsxVPluginV2(addr_pair_db.AllowedAddressPairsMixin,
                 if segmentation_id_set:
                     err_msg = _("Segmentation ID cannot be set with VXLAN")
             elif network_type == c_utils.NsxVNetworkTypes.PORTGROUP:
-                external = network.get(ext_net_extn.EXTERNAL)
+                external = network.get(extnet_apidef.EXTERNAL)
                 if segmentation_id_set:
                     err_msg = _("Segmentation ID cannot be set with portgroup")
                 if not physical_network_set:
@@ -1053,7 +1053,7 @@ class NsxVPluginV2(addr_pair_db.AllowedAddressPairsMixin,
         self._validate_availability_zones_in_obj(context, 'network', net_data)
         net_data['id'] = str(uuid.uuid4())
 
-        external = net_data.get(ext_net_extn.EXTERNAL)
+        external = net_data.get(extnet_apidef.EXTERNAL)
         backend_network = (not validators.is_attr_set(external) or
                            validators.is_attr_set(external) and not external)
         network_type = None
@@ -3200,7 +3200,7 @@ class NsxVPluginV2(addr_pair_db.AllowedAddressPairsMixin,
                         net = self.get_network(context.elevated(),
                                                subnet['network_id'])
                         route['network_id'] = net['id']
-                        if net.get(ext_net_extn.EXTERNAL):
+                        if net.get(extnet_apidef.EXTERNAL):
                             route['external'] = True
 
     def _prepare_edge_extra_routes(self, context, router_id):
@@ -3526,7 +3526,7 @@ class NsxVPluginV2(addr_pair_db.AllowedAddressPairsMixin,
         net_id, subnet_id = self._get_interface_info(context, interface_info)
         network = self.get_network(context.elevated(), net_id)
         # Do not support external subnet/port as a router interface
-        if network.get(ext_net_extn.EXTERNAL):
+        if network.get(extnet_apidef.EXTERNAL):
             msg = _("cannot add an external subnet/port as a router interface")
             raise n_exc.InvalidInput(error_message=msg)
 
diff --git a/vmware_nsx/plugins/nsx_v3/plugin.py b/vmware_nsx/plugins/nsx_v3/plugin.py
index 35f07e88be..07305c7cc1 100644
--- a/vmware_nsx/plugins/nsx_v3/plugin.py
+++ b/vmware_nsx/plugins/nsx_v3/plugin.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import netaddr
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import network as net_def
 from neutron_lib.api.definitions import port_security as psec
 from neutron_lib.exceptions import port_security as psec_exc
@@ -47,7 +48,6 @@ from neutron.db import portsecurity_db
 from neutron.db import securitygroups_db
 from neutron.extensions import allowedaddresspairs as addr_pair
 from neutron.extensions import availability_zone as az_ext
-from neutron.extensions import external_net as ext_net_extn
 from neutron.extensions import l3
 from neutron.extensions import providernet
 from neutron.extensions import securitygroup as ext_sg
@@ -906,7 +906,7 @@ class NsxV3Plugin(agentschedulers_db.AZDhcpAgentSchedulerDbMixin,
 
     def create_network(self, context, network):
         net_data = network['network']
-        external = net_data.get(ext_net_extn.EXTERNAL)
+        external = net_data.get(extnet_apidef.EXTERNAL)
         is_backend_network = False
         tenant_id = net_data['tenant_id']
 
diff --git a/vmware_nsx/services/dynamic_routing/nsx_v/driver.py b/vmware_nsx/services/dynamic_routing/nsx_v/driver.py
index 9464b0baef..3434139fec 100644
--- a/vmware_nsx/services/dynamic_routing/nsx_v/driver.py
+++ b/vmware_nsx/services/dynamic_routing/nsx_v/driver.py
@@ -20,8 +20,8 @@ from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import excutils
 
-from neutron.extensions import external_net
 from neutron_lib.api.definitions import address_scope
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib import constants as n_const
 from neutron_lib import exceptions as n_exc
 from neutron_lib.plugins import directory
@@ -392,7 +392,7 @@ class NSXvBgpDriver(object):
     def _validate_gateway_network(self, context, speaker_id, network_id):
         ext_net = self._core_plugin.get_network(context, network_id)
 
-        if not ext_net.get(external_net.EXTERNAL):
+        if not ext_net.get(extnet_apidef.EXTERNAL):
             raise nsx_exc.NsxBgpNetworkNotExternal(net_id=network_id)
         if not ext_net['subnets']:
             raise nsx_exc.NsxBgpGatewayNetworkHasNoSubnets(net_id=network_id)
diff --git a/vmware_nsx/services/ipam/nsx_v/driver.py b/vmware_nsx/services/ipam/nsx_v/driver.py
index 64cb143b00..a5211ae410 100644
--- a/vmware_nsx/services/ipam/nsx_v/driver.py
+++ b/vmware_nsx/services/ipam/nsx_v/driver.py
@@ -17,10 +17,10 @@
 import xml.etree.ElementTree as et
 
 import netaddr
-from neutron.extensions import external_net as ext_net_extn
 from neutron.extensions import multiprovidernet as mpnet
 from neutron.ipam import exceptions as ipam_exc
 from neutron.ipam import requests as ipam_req
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib.api import validators
 from oslo_log import log as logging
@@ -51,7 +51,7 @@ class NsxvIpamDriver(common.NsxAbstractIpamDriver, NsxVIpamBase):
         network_id = subnet_request.network_id
         if network_id:
             network = self._fetch_network(self._context, network_id)
-            if network.get(ext_net_extn.EXTERNAL):
+            if network.get(extnet_apidef.EXTERNAL):
                 # external network
                 return True
             if (validators.is_attr_set(network.get(mpnet.SEGMENTS)) or
diff --git a/vmware_nsx/tests/unit/nsx_mh/test_plugin.py b/vmware_nsx/tests/unit/nsx_mh/test_plugin.py
index 74c0940232..60ea13f979 100644
--- a/vmware_nsx/tests/unit/nsx_mh/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_mh/test_plugin.py
@@ -18,7 +18,6 @@ import uuid
 import mock
 from neutron.api.v2 import attributes
 from neutron.extensions import dvr
-from neutron.extensions import external_net
 from neutron.extensions import l3
 from neutron.extensions import l3_ext_gw_mode
 from neutron.extensions import securitygroup as secgrp
@@ -29,6 +28,7 @@ import neutron.tests.unit.extensions.test_l3 as test_l3_plugin
 import neutron.tests.unit.extensions.test_l3_ext_gw_mode as test_ext_gw_mode
 import neutron.tests.unit.extensions.test_securitygroup as ext_sg
 from neutron.tests.unit import testlib_api
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib import constants
@@ -72,8 +72,8 @@ class NsxPluginV2TestCase(test_plugin.NeutronDbPluginV2TestCase):
         # attributes containing a colon to be passed with
         # a double underscore instead
         kwargs = dict((k.replace('__', ':'), v) for k, v in kwargs.items())
-        if external_net.EXTERNAL in kwargs:
-            arg_list = (external_net.EXTERNAL, ) + (arg_list or ())
+        if extnet_apidef.EXTERNAL in kwargs:
+            arg_list = (extnet_apidef.EXTERNAL, ) + (arg_list or ())
 
         attrs = kwargs
         if providernet_args:
@@ -547,7 +547,7 @@ class TestL3NatTestCase(L3NatTest,
         net_type = utils.NetworkTypes.L3_EXT
         expected = [('subnets', []), ('name', name), ('admin_state_up', True),
                     ('status', 'ACTIVE'), ('shared', False),
-                    (external_net.EXTERNAL, True),
+                    (extnet_apidef.EXTERNAL, True),
                     (pnet.NETWORK_TYPE, net_type),
                     (pnet.PHYSICAL_NETWORK, 'l3_gw_uuid'),
                     (pnet.SEGMENTATION_ID, vlan_id)]
@@ -1027,7 +1027,7 @@ class NeutronNsxOutOfSync(NsxPluginV2TestCase,
         net_id = net['network']['id']
         if external:
             self._update('networks', net_id,
-                         {'network': {external_net.EXTERNAL: True}})
+                         {'network': {extnet_apidef.EXTERNAL: True}})
         sub_res = self._create_subnet('json', net_id, cidr)
         sub = self.deserialize('json', sub_res)
         return net_id, sub['subnet']['id']
diff --git a/vmware_nsx/tests/unit/nsx_v/test_plugin.py b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
index fd8891f723..ed37903fbd 100644
--- a/vmware_nsx/tests/unit/nsx_v/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
@@ -23,7 +23,6 @@ from neutron.api.v2 import attributes
 from neutron.extensions import address_scope
 from neutron.extensions import allowedaddresspairs as addr_pair
 from neutron.extensions import dvr as dist_router
-from neutron.extensions import external_net
 from neutron.extensions import l3
 from neutron.extensions import l3_ext_gw_mode
 from neutron.extensions import l3_flavors
@@ -42,6 +41,7 @@ import neutron.tests.unit.extensions.test_portsecurity as test_psec
 import neutron.tests.unit.extensions.test_securitygroup as ext_sg
 from neutron.tests.unit import testlib_api
 from neutron_lib.api.definitions import address_scope as addr_apidef
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import extra_dhcp_opt as edo_ext
 from neutron_lib.api.definitions import port_security as psec
 from neutron_lib.api.definitions import portbindings
@@ -126,8 +126,8 @@ class NsxVPluginV2TestCase(test_plugin.NeutronDbPluginV2TestCase):
         # attributes containing a colon to be passed with
         # a double underscore instead
         kwargs = dict((k.replace('__', ':'), v) for k, v in kwargs.items())
-        if external_net.EXTERNAL in kwargs:
-            arg_list = (external_net.EXTERNAL, ) + (arg_list or ())
+        if extnet_apidef.EXTERNAL in kwargs:
+            arg_list = (extnet_apidef.EXTERNAL, ) + (arg_list or ())
 
         attrs = kwargs
         if providernet_args:
@@ -311,17 +311,17 @@ class TestNetworksV2(test_plugin.TestNetworksV2, NsxVPluginV2TestCase):
         name = 'ext_net'
         expected = [('subnets', []), ('name', name), ('admin_state_up', True),
                     ('status', 'ACTIVE'), ('shared', False),
-                    (external_net.EXTERNAL, True),
+                    (extnet_apidef.EXTERNAL, True),
                     (pnet.NETWORK_TYPE, 'portgroup'),
                     (pnet.PHYSICAL_NETWORK, 'tzuuid')]
         providernet_args = {pnet.NETWORK_TYPE: 'portgroup',
                             pnet.PHYSICAL_NETWORK: 'tzuuid',
-                            external_net.EXTERNAL: True}
+                            extnet_apidef.EXTERNAL: True}
         with self.network(name=name,
                           providernet_args=providernet_args,
                           arg_list=(pnet.NETWORK_TYPE,
                                     pnet.PHYSICAL_NETWORK,
-                                    external_net.EXTERNAL)) as net:
+                                    extnet_apidef.EXTERNAL)) as net:
             for k, v in expected:
                 self.assertEqual(net['network'][k], v)
 
@@ -2241,7 +2241,7 @@ class L3NatTest(test_l3_plugin.L3BaseForIntTests, NsxVPluginV2TestCase):
 
     def _set_net_external(self, net_id):
         self._update('networks', net_id,
-                     {'network': {external_net.EXTERNAL: True}})
+                     {'network': {extnet_apidef.EXTERNAL: True}})
 
     def _add_external_gateway_to_router(self, router_id, network_id,
                                         expected_code=webob.exc.HTTPOk.code,
@@ -2786,7 +2786,7 @@ class TestExclusiveRouterTestCase(L3NatTest, L3NatTestCaseBase,
         name = 'l3_ext_net'
         expected = [('subnets', []), ('name', name), ('admin_state_up', True),
                     ('status', 'ACTIVE'), ('shared', False),
-                    (external_net.EXTERNAL, True)]
+                    (extnet_apidef.EXTERNAL, True)]
         with self._create_l3_ext_network(vlan_id) as net:
             for k, v in expected:
                 self.assertEqual(net['network'][k], v)
diff --git a/vmware_nsx/tests/unit/nsx_v3/test_plugin.py b/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
index 99d661f8e7..cf6071f3e3 100644
--- a/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_v3/test_plugin.py
@@ -21,7 +21,6 @@ from webob import exc
 from neutron.api.v2 import attributes
 from neutron.db import models_v2
 from neutron.extensions import address_scope
-from neutron.extensions import external_net
 from neutron.extensions import extraroute
 from neutron.extensions import l3
 from neutron.extensions import l3_ext_gw_mode
@@ -38,6 +37,7 @@ from neutron.tests.unit.scheduler \
     import test_dhcp_agent_scheduler as test_dhcpagent
 
 from neutron_lib.api.definitions import address_scope as addr_apidef
+from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import port_security as psec
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import provider_net as pnet
@@ -223,8 +223,8 @@ class NsxV3PluginTestCaseMixin(test_plugin.NeutronDbPluginV2TestCase,
         # attributes containing a colon to be passed with
         # a double underscore instead
         kwargs = dict((k.replace('__', ':'), v) for k, v in kwargs.items())
-        if external_net.EXTERNAL in kwargs:
-            arg_list = (external_net.EXTERNAL, ) + (arg_list or ())
+        if extnet_apidef.EXTERNAL in kwargs:
+            arg_list = (extnet_apidef.EXTERNAL, ) + (arg_list or ())
 
         if providernet_args:
             kwargs.update(providernet_args)
@@ -1054,7 +1054,7 @@ class TestL3NatTestCase(L3NatTest,
         net_type = utils.NetworkTypes.L3_EXT
         expected = [('subnets', []), ('name', name), ('admin_state_up', True),
                     ('status', 'ACTIVE'), ('shared', False),
-                    (external_net.EXTERNAL, True),
+                    (extnet_apidef.EXTERNAL, True),
                     (pnet.NETWORK_TYPE, net_type),
                     (pnet.PHYSICAL_NETWORK, physical_network)]
         with self._create_l3_ext_network(physical_network) as net: