diff --git a/nova/api/openstack/common.py b/nova/api/openstack/common.py
index 770dcfec1f..36f6ed739a 100644
--- a/nova/api/openstack/common.py
+++ b/nova/api/openstack/common.py
@@ -30,6 +30,7 @@ from nova.compute import vm_states
 import nova.conf
 from nova import exception
 from nova.i18n import _
+from nova.network.neutronv2 import constants
 from nova import objects
 from nova import quota
 from nova import utils
@@ -578,9 +579,9 @@ def instance_has_port_with_resource_request(
     # instance has no port with resource request. If the instance is shelve
     # offloaded then we still have to hit neutron.
     search_opts = {'device_id': instance_uuid,
-                   'fields': ['resource_request']}
+                   'fields': [constants.RESOURCE_REQUEST]}
     ports = network_api.list_ports(context, **search_opts).get('ports', [])
     for port in ports:
-        if port.get('resource_request'):
+        if port.get(constants.RESOURCE_REQUEST):
             return True
     return False
diff --git a/nova/cmd/manage.py b/nova/cmd/manage.py
index 35be2d6bda..7b628e1710 100644
--- a/nova/cmd/manage.py
+++ b/nova/cmd/manage.py
@@ -1677,7 +1677,8 @@ class PlacementCommands(object):
         try:
             return neutron.list_ports(
                 ctxt, device_id=instance.uuid,
-                fields=['id', 'resource_request', constants.BINDING_PROFILE]
+                fields=['id', constants.RESOURCE_REQUEST,
+                        constants.BINDING_PROFILE]
             )['ports']
         except neutron_client_exc.NeutronClientException as e:
             raise exception.UnableToQueryPorts(
@@ -1685,7 +1686,7 @@ class PlacementCommands(object):
 
     @staticmethod
     def _has_request_but_no_allocation(port):
-        request = port.get('resource_request')
+        request = port.get(constants.RESOURCE_REQUEST)
         binding_profile = port.get(constants.BINDING_PROFILE, {}) or {}
         allocation = binding_profile.get(constants.ALLOCATION)
         # We are defensive here about 'resources' and 'required' in the
@@ -1775,7 +1776,8 @@ class PlacementCommands(object):
             instance allocation dict.
         """
         matching_rp_uuids = self._get_rps_in_tree_with_required_traits(
-            ctxt, node_uuid, port['resource_request']['required'], placement)
+            ctxt, node_uuid, port[constants.RESOURCE_REQUEST]['required'],
+            placement)
 
         if len(matching_rp_uuids) > 1:
             # If there is more than one such RP then it is an ambiguous
@@ -1797,7 +1799,7 @@ class PlacementCommands(object):
             raise exception.NoResourceProviderToHealFrom(
                 port_id=port['id'],
                 instance_uuid=instance_uuid,
-                traits=port['resource_request']['required'],
+                traits=port[constants.RESOURCE_REQUEST]['required'],
                 node_uuid=node_uuid)
 
         # We found one RP that matches the traits. Assume that we can allocate
@@ -1807,7 +1809,7 @@ class PlacementCommands(object):
 
         port_allocation = {
             rp_uuid: {
-                'resources': port['resource_request']['resources']
+                'resources': port[constants.RESOURCE_REQUEST]['resources']
             }
         }
         return port_allocation
@@ -1881,7 +1883,7 @@ class PlacementCommands(object):
                      "traits for port %(port_uuid)s with resource request "
                      "%(request)s attached to instance %(instance_uuid)s") %
                      {"rp_uuid": rp_uuid, "port_uuid": port["id"],
-                      "request": port.get("resource_request"),
+                      "request": port.get(constants.RESOURCE_REQUEST),
                       "instance_uuid": instance.uuid})
 
         return allocations, ports_to_heal
diff --git a/nova/compute/api.py b/nova/compute/api.py
index a8eedbbbc7..a2b2eb6a9a 100644
--- a/nova/compute/api.py
+++ b/nova/compute/api.py
@@ -63,6 +63,7 @@ from nova.i18n import _
 from nova import image
 from nova import network
 from nova.network import model as network_model
+from nova.network.neutronv2 import constants
 from nova.network.security_group import openstack_driver
 from nova.network.security_group import security_group_base
 from nova import objects
@@ -4352,7 +4353,7 @@ class API(base.Base):
         # need a new scheduling if resource on this host is not available.
         if port_id:
             port = self.network_api.show_port(context, port_id)
-            if port['port'].get('resource_request'):
+            if port['port'].get(constants.RESOURCE_REQUEST):
                 raise exception.AttachInterfaceWithQoSPolicyNotSupported(
                     instance_uuid=instance.uuid)
 
diff --git a/nova/network/neutronv2/api.py b/nova/network/neutronv2/api.py
index 91c959f131..bd6931b7bf 100644
--- a/nova/network/neutronv2/api.py
+++ b/nova/network/neutronv2/api.py
@@ -462,7 +462,7 @@ class API(base_api.NetworkAPI):
             # such ports are currently not supported as they would at least
             # need resource allocation manipulation in placement but might also
             # need a new scheduling if resource on this host is not available.
-            if port.get('resource_request', None):
+            if port.get(constants.RESOURCE_REQUEST, None):
                 msg = _(
                     "The auto-created port %(port_id)s is being deleted due "
                     "to its network having QoS policy.")
@@ -1003,7 +1003,7 @@ class API(base_api.NetworkAPI):
         for port in requested_ports_dict.values():
             # only communicate the allocations if the port has resource
             # requests
-            if port.get('resource_request'):
+            if port.get(constants.RESOURCE_REQUEST):
                 profile = port.get(constants.BINDING_PROFILE, {})
                 # NOTE(gibi): In the resource provider mapping there can be
                 # more than one RP fulfilling a request group. But resource
@@ -1668,7 +1668,7 @@ class API(base_api.NetworkAPI):
         if port:
             # if there is resource associated to this port then that needs to
             # be deallocated so lets return info about such allocation
-            resource_request = port.get('resource_request')
+            resource_request = port.get(constants.RESOURCE_REQUEST)
             allocated_rp = port.get(
                 constants.BINDING_PROFILE, {}).get(constants.ALLOCATION)
             if resource_request and allocated_rp:
@@ -1955,7 +1955,7 @@ class API(base_api.NetworkAPI):
         port = self._show_port(
             context, port_id, neutron_client=neutron,
             fields=['binding:vnic_type', constants.BINDING_PROFILE,
-                    'network_id', 'resource_request'])
+                    'network_id', constants.RESOURCE_REQUEST])
         network_id = port.get('network_id')
         trusted = None
         vnic_type = port.get('binding:vnic_type',
@@ -1967,7 +1967,7 @@ class API(base_api.NetworkAPI):
         # set depending on neutron configuration, e.g. if QoS rules are
         # applied to the port/network and the port-resource-request API
         # extension is enabled.
-        resource_request = port.get('resource_request', None)
+        resource_request = port.get(constants.RESOURCE_REQUEST, None)
         return vnic_type, trusted, network_id, resource_request
 
     def create_resource_requests(self, context, requested_networks,
diff --git a/nova/network/neutronv2/constants.py b/nova/network/neutronv2/constants.py
index 19bf3565f0..1bb4605c9f 100644
--- a/nova/network/neutronv2/constants.py
+++ b/nova/network/neutronv2/constants.py
@@ -27,3 +27,4 @@ BINDING_HOST_ID = 'binding:host_id'
 MIGRATING_ATTR = 'migrating_to'
 L3_NETWORK_TYPES = ['vxlan', 'gre', 'geneve']
 ALLOCATION = 'allocation'
+RESOURCE_REQUEST = 'resource_request'
diff --git a/nova/tests/fixtures.py b/nova/tests/fixtures.py
index d513af5e90..5112fbf7a4 100644
--- a/nova/tests/fixtures.py
+++ b/nova/tests/fixtures.py
@@ -1284,7 +1284,7 @@ class NeutronFixture(fixtures.Fixture):
             }
         ],
         'tenant_id': tenant_id,
-        'resource_request': {
+        neutron_constants.RESOURCE_REQUEST: {
             "resources": {
                     orc.NET_BW_IGR_KILOBIT_PER_SEC: 1000,
                     orc.NET_BW_EGR_KILOBIT_PER_SEC: 1000},
@@ -1337,7 +1337,7 @@ class NeutronFixture(fixtures.Fixture):
             }
         ],
         'tenant_id': tenant_id,
-        'resource_request': {},
+        neutron_constants.RESOURCE_REQUEST: {},
         'binding:vnic_type': 'direct',
     }
 
@@ -1355,7 +1355,7 @@ class NeutronFixture(fixtures.Fixture):
             }
         ],
         'tenant_id': tenant_id,
-        'resource_request': {
+        neutron_constants.RESOURCE_REQUEST: {
             "resources": {
                 orc.NET_BW_IGR_KILOBIT_PER_SEC: 10000,
                 orc.NET_BW_EGR_KILOBIT_PER_SEC: 10000},
@@ -1378,7 +1378,7 @@ class NeutronFixture(fixtures.Fixture):
             }
         ],
         'tenant_id': tenant_id,
-        'resource_request': {
+        neutron_constants.RESOURCE_REQUEST: {
             "resources": {
                 orc.NET_BW_IGR_KILOBIT_PER_SEC: 10000,
                 orc.NET_BW_EGR_KILOBIT_PER_SEC: 10000},
diff --git a/nova/tests/functional/test_nova_manage.py b/nova/tests/functional/test_nova_manage.py
index 609e2a2a57..4ed16cc240 100644
--- a/nova/tests/functional/test_nova_manage.py
+++ b/nova/tests/functional/test_nova_manage.py
@@ -24,6 +24,7 @@ from nova.cmd import manage
 from nova import config
 from nova import context
 from nova import exception
+from nova.network.neutronv2 import constants
 from nova import objects
 from nova import test
 from nova.tests import fixtures as nova_fixtures
@@ -770,7 +771,7 @@ class TestNovaManagePlacementHealPortAllocations(
         # _ports list is safe as it is re-created for each Neutron fixture
         # instance therefore for each individual test using that fixture.
         bound_port = self.neutron._ports[port_id]
-        bound_port['resource_request'] = resource_request
+        bound_port[constants.RESOURCE_REQUEST] = resource_request
 
     def _create_server_with_missing_port_alloc(
             self, ports, resource_request=None):
@@ -822,7 +823,7 @@ class TestNovaManagePlacementHealPortAllocations(
         # bridge RP
         total_request = collections.defaultdict(int)
         for port in ports:
-            port_request = port['resource_request']['resources']
+            port_request = port[constants.RESOURCE_REQUEST]['resources']
             for rc, amount in port_request.items():
                 total_request[rc] += amount
         self.assertEqual(total_request, network_allocations)
diff --git a/nova/tests/functional/test_servers.py b/nova/tests/functional/test_servers.py
index c666cecc9b..22834e5d16 100644
--- a/nova/tests/functional/test_servers.py
+++ b/nova/tests/functional/test_servers.py
@@ -36,6 +36,7 @@ from nova.compute import instance_actions
 from nova.compute import manager as compute_manager
 from nova import context
 from nova import exception
+from nova.network.neutronv2 import constants
 from nova import objects
 from nova.objects import block_device as block_device_obj
 from nova.scheduler import utils
@@ -5655,7 +5656,7 @@ class PortResourceRequestBasedSchedulingTestBase(
         self._create_sriov_networking_rp_tree(compute_rp_uuid)
 
     def assertPortMatchesAllocation(self, port, allocations):
-        port_request = port['resource_request']['resources']
+        port_request = port[constants.RESOURCE_REQUEST]['resources']
         for rc, amount in allocations.items():
             self.assertEqual(port_request[rc], amount,
                              'port %s requested %d %s '
@@ -5674,8 +5675,9 @@ class UnsupportedPortResourceRequestBasedSchedulingTest(
         # _ports list is safe as it is re-created for each Neutron fixture
         # instance therefore for each individual test using that fixture.
         bound_port = self.neutron._ports[port_id]
-        bound_port['resource_request'] = (
-            self.neutron.port_with_resource_request['resource_request'])
+        bound_port[constants.RESOURCE_REQUEST] = (
+            self.neutron.port_with_resource_request[
+                constants.RESOURCE_REQUEST])
 
     def test_interface_attach_with_port_resource_request(self):
         # create a server
diff --git a/nova/tests/unit/compute/test_compute_api.py b/nova/tests/unit/compute/test_compute_api.py
index 59eb9431fc..58616b9b70 100644
--- a/nova/tests/unit/compute/test_compute_api.py
+++ b/nova/tests/unit/compute/test_compute_api.py
@@ -43,6 +43,7 @@ from nova.db import api as db
 from nova import exception
 from nova.image import api as image_api
 from nova.network.neutronv2 import api as neutron_api
+from nova.network.neutronv2 import constants
 from nova import objects
 from nova.objects import base as obj_base
 from nova.objects import block_device as block_device_obj
@@ -6219,7 +6220,7 @@ class ComputeAPIUnitTestCase(_ComputeAPIUnitTestMixIn, test.NoDBTestCase):
         with mock.patch.object(
                 self.compute_api.network_api, 'show_port',
                 return_value={'port': {
-                    'resource_request': {
+                    constants.RESOURCE_REQUEST: {
                         'resources': {'CUSTOM_RESOURCE_CLASS': 42}
                 }}}) as mock_show_port:
             self.assertRaises(
diff --git a/nova/tests/unit/network/test_neutronv2.py b/nova/tests/unit/network/test_neutronv2.py
index 4ba2cd03ad..8ef446ff4e 100644
--- a/nova/tests/unit/network/test_neutronv2.py
+++ b/nova/tests/unit/network/test_neutronv2.py
@@ -2135,7 +2135,8 @@ class TestNeutronv2(TestNeutronv2Base):
         if binding_vnic_type:
             test_port['port']['binding:vnic_type'] = binding_vnic_type
         if port_resource_request:
-            test_port['port']['resource_request'] = port_resource_request
+            test_port['port'][
+                constants.RESOURCE_REQUEST] = port_resource_request
 
         mock_get_client.reset_mock()
         mock_client = mock_get_client()
@@ -2147,7 +2148,7 @@ class TestNeutronv2(TestNeutronv2Base):
 
         mock_client.show_port.assert_called_once_with(test_port['port']['id'],
             fields=['binding:vnic_type', 'binding:profile', 'network_id',
-                    'resource_request'])
+                    constants.RESOURCE_REQUEST])
         self.assertEqual(expected_vnic_type, vnic_type)
         self.assertEqual('net-id', network_id)
         self.assertIsNone(trusted)
@@ -3523,7 +3524,7 @@ class TestNeutronv2WithMock(TestNeutronv2Base):
 
         mock_client.show_port.assert_called_once_with(test_port['port']['id'],
             fields=['binding:vnic_type', 'binding:profile', 'network_id',
-                    'resource_request'])
+                    constants.RESOURCE_REQUEST])
         self.assertEqual(model.VNIC_TYPE_DIRECT, vnic_type)
         self.assertEqual('net-id', network_id)
         self.assertTrue(trusted)
@@ -3968,7 +3969,8 @@ class TestNeutronv2WithMock(TestNeutronv2Base):
         mock_client = mock.MagicMock()
         mock_client.create_port.return_value = {'port': {
             'id': uuids.port_id,
-            'resource_request': {'resources': {'CUSTOM_RESOURCE_CLASS': 42}}
+            constants.RESOURCE_REQUEST: {
+                'resources': {'CUSTOM_RESOURCE_CLASS': 42}}
         }}
 
         exc = self.assertRaises(exception.NetworksWithQoSPolicyNotSupported,
@@ -3989,7 +3991,8 @@ class TestNeutronv2WithMock(TestNeutronv2Base):
         mock_client = mock.MagicMock()
         mock_client.create_port.return_value = {'port': {
             'id': uuids.port_id,
-            'resource_request': {'resources': {'CUSTOM_RESOURCE_CLASS': 42}}
+            constants.RESOURCE_REQUEST: {
+                'resources': {'CUSTOM_RESOURCE_CLASS': 42}}
         }}
         mock_client.delete_port.side_effect = \
             exceptions.NeutronClientException()
@@ -5038,7 +5041,7 @@ class TestNeutronv2WithMock(TestNeutronv2Base):
         mock_client = mock.Mock()
         mock_client.show_port.return_value = {
             'port': {
-                'resource_request': {
+                constants.RESOURCE_REQUEST: {
                     'resources': {
                         'NET_BW_EGR_KILOBIT_PER_SEC': 1000
                     }
@@ -5178,7 +5181,7 @@ class TestNeutronv2WithMock(TestNeutronv2Base):
             'tenant_id': uuids.project_id,
             'network_id': uuids.networkid_1,
             'mac_address': 'fake-mac',
-            'resource_request': 'fake-request'
+            constants.RESOURCE_REQUEST: 'fake-request'
         }
         mock_show_port.return_value = port
         mock_get_client.return_value.list_networks.return_value = {