diff --git a/neutron/api/v2/attributes.py b/neutron/api/v2/attributes.py
index 25ce8285c80..45ac2f12a44 100644
--- a/neutron/api/v2/attributes.py
+++ b/neutron/api/v2/attributes.py
@@ -14,6 +14,10 @@
 #    under the License.
 
 from neutron_lib.api import converters as lib_converters
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib import constants
 from neutron_lib.db import constants as db_const
 
@@ -22,18 +26,10 @@ from neutron_lib.db import constants as db_const
 SHARED = 'shared'
 
 # Define constants for base resource name
-NETWORK = 'network'
-NETWORKS = '%ss' % NETWORK
-PORT = 'port'
-PORTS = '%ss' % PORT
-SUBNET = 'subnet'
-SUBNETS = '%ss' % SUBNET
-SUBNETPOOL = 'subnetpool'
-SUBNETPOOLS = '%ss' % SUBNETPOOL
-CORE_RESOURCES = {'network': 'networks',
-                  'subnet': 'subnets',
-                  'subnetpool': 'subnetpools',
-                  'port': 'ports'}
+CORE_RESOURCES = {net_def.RESOURCE_NAME: net_def.COLLECTION_NAME,
+                  subnet_def.RESOURCE_NAME: subnet_def.COLLECTION_NAME,
+                  subnetpool_def.RESOURCE_NAME: subnetpool_def.COLLECTION_NAME,
+                  port_def.RESOURCE_NAME: port_def.COLLECTION_NAME}
 # Note: a default of ATTR_NOT_SPECIFIED indicates that an
 # attribute is not required, but will be generated by the plugin
 # if it is not specified.  Particularly, a value of ATTR_NOT_SPECIFIED
@@ -58,7 +54,7 @@ CORE_RESOURCES = {'network': 'networks',
 # mechanism, ie: there might be rules which refer to this attribute.
 
 RESOURCE_ATTRIBUTE_MAP = {
-    NETWORKS: {
+    net_def.COLLECTION_NAME: {
         'id': {'allow_post': False, 'allow_put': False,
                'validate': {'type:uuid': None},
                'is_visible': True,
@@ -88,7 +84,7 @@ RESOURCE_ATTRIBUTE_MAP = {
                  'required_by_policy': True,
                  'enforce_policy': True},
     },
-    PORTS: {
+    port_def.COLLECTION_NAME: {
         'id': {'allow_post': False, 'allow_put': False,
                'validate': {'type:uuid': None},
                'is_visible': True,
@@ -134,7 +130,7 @@ RESOURCE_ATTRIBUTE_MAP = {
         'status': {'allow_post': False, 'allow_put': False,
                    'is_visible': True},
     },
-    SUBNETS: {
+    subnet_def.COLLECTION_NAME: {
         'id': {'allow_post': False, 'allow_put': False,
                'validate': {'type:uuid': None},
                'is_visible': True,
@@ -215,7 +211,7 @@ RESOURCE_ATTRIBUTE_MAP = {
                  'required_by_policy': True,
                  'enforce_policy': True},
     },
-    SUBNETPOOLS: {
+    subnetpool_def.COLLECTION_NAME: {
         'id': {'allow_post': False,
                'allow_put': False,
                'validate': {'type:uuid': None},
@@ -282,7 +278,7 @@ RESOURCE_ATTRIBUTE_MAP = {
 # Identify the attribute used by a resource to reference another resource
 
 RESOURCE_FOREIGN_KEYS = {
-    NETWORKS: 'network_id'
+    net_def.COLLECTION_NAME: 'network_id'
 }
 
 
diff --git a/neutron/db/address_scope_db.py b/neutron/db/address_scope_db.py
index 5becc826595..f276d97a2af 100644
--- a/neutron/db/address_scope_db.py
+++ b/neutron/db/address_scope_db.py
@@ -12,11 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
 from neutron_lib import constants
 from oslo_utils import uuidutils
 
 from neutron._i18n import _
-from neutron.api.v2 import attributes as attr
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import _utils as db_utils
 from neutron.db import api as db_api
@@ -119,7 +119,7 @@ class AddressScopeDbMixin(ext_address_scope.AddressScopePluginBase):
             address_scope.delete()
 
     @staticmethod
-    @resource_extend.extends([attr.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_network_dict_address_scope(network_res, network_db):
         network_res[ext_address_scope.IPV4_ADDRESS_SCOPE] = None
         network_res[ext_address_scope.IPV6_ADDRESS_SCOPE] = None
diff --git a/neutron/db/allowedaddresspairs_db.py b/neutron/db/allowedaddresspairs_db.py
index 114b01142dd..af127880c5c 100644
--- a/neutron/db/allowedaddresspairs_db.py
+++ b/neutron/db/allowedaddresspairs_db.py
@@ -13,9 +13,9 @@
 #    under the License.
 #
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api import validators
 
-from neutron.api.v2 import attributes as attr
 from neutron.common import utils
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import _utils as db_utils
@@ -65,7 +65,7 @@ class AllowedAddressPairsMixin(object):
                 for pair in pairs]
 
     @staticmethod
-    @resource_extend.extends([attr.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_allowed_address_pairs(port_res, port_db):
         # If port_db is provided, allowed address pairs will be accessed via
         # sqlalchemy models. As they're loaded together with ports this
diff --git a/neutron/db/availability_zone/network.py b/neutron/db/availability_zone/network.py
index 6e9fccf0dcd..2e0c3ecf234 100644
--- a/neutron/db/availability_zone/network.py
+++ b/neutron/db/availability_zone/network.py
@@ -11,9 +11,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
 from neutron_lib.plugins import directory
 
-from neutron.api.v2 import attributes
 from neutron.db import _resource_extend as resource_extend
 from neutron.extensions import availability_zone as az_ext
 from neutron.extensions import network_availability_zone as net_az
@@ -24,7 +24,7 @@ class NetworkAvailabilityZoneMixin(net_az.NetworkAvailabilityZonePluginBase):
     """Mixin class to enable network's availability zone attributes."""
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_availability_zone(net_res, net_db):
         net_res[az_ext.AZ_HINTS] = az_ext.convert_az_string_to_list(
             net_db[az_ext.AZ_HINTS])
diff --git a/neutron/db/db_base_plugin_common.py b/neutron/db/db_base_plugin_common.py
index 4d9c4df3ebc..55a9b442a3f 100644
--- a/neutron/db/db_base_plugin_common.py
+++ b/neutron/db/db_base_plugin_common.py
@@ -15,6 +15,10 @@
 
 import functools
 
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib.api import validators
 from neutron_lib import constants
 from neutron_lib import exceptions as n_exc
@@ -23,7 +27,6 @@ from oslo_config import cfg
 from oslo_log import log as logging
 from sqlalchemy.orm import exc
 
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import exceptions
 from neutron.db import _model_query as model_query
@@ -154,7 +157,7 @@ class DbBasePluginCommon(common_db_mixin.CommonDbMixin):
         # The shared attribute for a subnet is the same as its parent network
         res['shared'] = self._is_network_shared(context, subnet.rbac_entries)
         # Call auxiliary extend functions, if any
-        resource_extend.apply_funcs(attributes.SUBNETS, res, subnet)
+        resource_extend.apply_funcs(subnet_def.COLLECTION_NAME, res, subnet)
         return db_utils.resource_fields(res, fields)
 
     def _make_subnetpool_dict(self, subnetpool, fields=None):
@@ -173,7 +176,8 @@ class DbBasePluginCommon(common_db_mixin.CommonDbMixin):
                'ip_version': subnetpool['ip_version'],
                'default_quota': subnetpool['default_quota'],
                'address_scope_id': subnetpool['address_scope_id']}
-        resource_extend.apply_funcs(attributes.SUBNETPOOLS, res, subnetpool)
+        resource_extend.apply_funcs(
+            subnetpool_def.COLLECTION_NAME, res, subnetpool)
         return db_utils.resource_fields(res, fields)
 
     def _make_port_dict(self, port, fields=None,
@@ -192,7 +196,7 @@ class DbBasePluginCommon(common_db_mixin.CommonDbMixin):
                "device_owner": port["device_owner"]}
         # Call auxiliary extend functions, if any
         if process_extensions:
-            resource_extend.apply_funcs(attributes.PORTS, res, port)
+            resource_extend.apply_funcs(port_def.COLLECTION_NAME, res, port)
         return db_utils.resource_fields(res, fields)
 
     def _get_network(self, context, id):
@@ -276,7 +280,7 @@ class DbBasePluginCommon(common_db_mixin.CommonDbMixin):
         res['shared'] = self._is_network_shared(context, network.rbac_entries)
         # Call auxiliary extend functions, if any
         if process_extensions:
-            resource_extend.apply_funcs(attributes.NETWORKS, res, network)
+            resource_extend.apply_funcs(net_def.COLLECTION_NAME, res, network)
         return db_utils.resource_fields(res, fields)
 
     def _is_network_shared(self, context, rbac_entries):
diff --git a/neutron/db/db_base_plugin_v2.py b/neutron/db/db_base_plugin_v2.py
index 8d0267376b1..bdaf8d4fdd8 100644
--- a/neutron/db/db_base_plugin_v2.py
+++ b/neutron/db/db_base_plugin_v2.py
@@ -16,6 +16,8 @@
 import functools
 
 import netaddr
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib.api import validators
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import exceptions
@@ -37,7 +39,6 @@ from sqlalchemy import not_
 
 from neutron._i18n import _, _LE, _LI
 from neutron.api.rpc.agentnotifiers import l3_rpc_agent_api
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import exceptions as n_exc
 from neutron.common import ipv6_utils
@@ -947,7 +948,7 @@ class NeutronDbPluginV2(db_base_plugin_common.DbBasePluginCommon,
             if auto_subnet:
                 # special flag to avoid re-allocation on auto subnets
                 fixed.append({'subnet_id': sub_id, 'delete_subnet': True})
-            data = {attributes.PORT: {'fixed_ips': fixed}}
+            data = {port_def.RESOURCE_NAME: {'fixed_ips': fixed}}
             self.update_port(context, port_id, data)
         except exc.PortNotFound:
             # port is gone
@@ -1159,7 +1160,7 @@ class NeutronDbPluginV2(db_base_plugin_common.DbBasePluginCommon,
 
         for key in ['min_prefixlen', 'max_prefixlen', 'default_prefixlen']:
             updated['key'] = str(updated[key])
-        resource_extend.apply_funcs(attributes.SUBNETPOOLS,
+        resource_extend.apply_funcs(subnetpool_def.COLLECTION_NAME,
                                     updated, orig_sp.db_obj)
         return updated
 
diff --git a/neutron/db/external_net_db.py b/neutron/db/external_net_db.py
index b6a1aec1010..4e76a7629db 100644
--- a/neutron/db/external_net_db.py
+++ b/neutron/db/external_net_db.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
 from neutron_lib.api import validators
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
@@ -24,7 +25,6 @@ from neutron_lib.plugins import directory
 from sqlalchemy.sql import expression as expr
 
 from neutron._i18n import _
-from neutron.api.v2 import attributes
 from neutron.db import _model_query as model_query
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import _utils as db_utils
@@ -84,7 +84,7 @@ class External_net_db_mixin(object):
             context, network_id=net_id)
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_network_dict_l3(network_res, network_db):
         # Comparing with None for converting uuid into bool
         network_res[external_net.EXTERNAL] = network_db.external is not None
diff --git a/neutron/db/extradhcpopt_db.py b/neutron/db/extradhcpopt_db.py
index 1982db5fa53..5829b0c83d1 100644
--- a/neutron/db/extradhcpopt_db.py
+++ b/neutron/db/extradhcpopt_db.py
@@ -14,9 +14,8 @@
 #    under the License.
 
 from neutron_lib.api.definitions import extra_dhcp_opt as edo_ext
+from neutron_lib.api.definitions import port as port_def
 
-
-from neutron.api.v2 import attributes
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
 from neutron.objects.port.extensions import extra_dhcp_opt as obj_extra_dhcp
@@ -118,7 +117,7 @@ class ExtraDhcpOptMixin(object):
         return bool(dopts)
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_extra_dhcp_opt(res, port):
         res[edo_ext.EXTRADHCPOPTS] = [{'opt_name': dho.opt_name,
                                        'opt_value': dho.opt_value,
diff --git a/neutron/db/l3_hamode_db.py b/neutron/db/l3_hamode_db.py
index c5a13aeeacb..1efa11d5dd6 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 port as port_def
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import provider_net as providernet
 from neutron_lib.api import validators
@@ -35,7 +36,6 @@ from sqlalchemy import exc as sql_exc
 from sqlalchemy import orm
 
 from neutron._i18n import _, _LE, _LI, _LW
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import utils as n_utils
 from neutron.db import _utils as db_utils
@@ -698,7 +698,7 @@ class L3_HA_NAT_db_mixin(l3_dvr_db.L3_NAT_with_dvr_db_mixin,
             port[portbindings.HOST_ID] = host
             try:
                 self._core_plugin.update_port(admin_ctx, port['id'],
-                                              {attributes.PORT: port})
+                                              {port_def.RESOURCE_NAME: port})
             except (orm.exc.StaleDataError, orm.exc.ObjectDeletedError,
                     n_exc.PortNotFound):
                 # Take concurrently deleted interfaces in to account
diff --git a/neutron/db/models_v2.py b/neutron/db/models_v2.py
index fb680827101..579ee840ddd 100644
--- a/neutron/db/models_v2.py
+++ b/neutron/db/models_v2.py
@@ -13,6 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib import constants
 from neutron_lib.db import constants as db_const
 from neutron_lib.db import model_base
@@ -20,7 +24,6 @@ import sqlalchemy as sa
 from sqlalchemy import orm
 from sqlalchemy import sql
 
-from neutron.api.v2 import attributes as attr
 from neutron.db.network_dhcp_agent_binding import models as ndab_model
 from neutron.db import rbac_db_models
 from neutron.db import standard_attr
@@ -106,7 +109,7 @@ class Port(standard_attr.HasStandardAttributes, model_base.BASEV2,
             name='uniq_ports0network_id0mac_address'),
         model_base.BASEV2.__table_args__
     )
-    api_collections = [attr.PORTS]
+    api_collections = [port_def.COLLECTION_NAME]
 
     def __init__(self, id=None, tenant_id=None, project_id=None, name=None,
                  network_id=None, mac_address=None, admin_state_up=None,
@@ -198,7 +201,7 @@ class Subnet(standard_attr.HasStandardAttributes, model_base.BASEV2,
         rbac_db_models.NetworkRBAC, lazy='subquery', uselist=True,
         foreign_keys='Subnet.network_id',
         primaryjoin='Subnet.network_id==NetworkRBAC.object_id')
-    api_collections = [attr.SUBNETS]
+    api_collections = [subnet_def.COLLECTION_NAME]
 
 
 class SubnetPoolPrefix(model_base.BASEV2):
@@ -235,7 +238,7 @@ class SubnetPool(standard_attr.HasStandardAttributes, model_base.BASEV2,
                                 backref='subnetpools',
                                 cascade='all, delete, delete-orphan',
                                 lazy='subquery')
-    api_collections = [attr.SUBNETPOOLS]
+    api_collections = [subnetpool_def.COLLECTION_NAME]
 
 
 class Network(standard_attr.HasStandardAttributes, model_base.BASEV2,
@@ -256,4 +259,4 @@ class Network(standard_attr.HasStandardAttributes, model_base.BASEV2,
     dhcp_agents = orm.relationship(
         'Agent', lazy='subquery', viewonly=True,
         secondary=ndab_model.NetworkDhcpAgentBinding.__table__)
-    api_collections = [attr.NETWORKS]
+    api_collections = [net_def.COLLECTION_NAME]
diff --git a/neutron/db/portbindings_base.py b/neutron/db/portbindings_base.py
index d580029ea04..58c6243645d 100644
--- a/neutron/db/portbindings_base.py
+++ b/neutron/db/portbindings_base.py
@@ -13,9 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.plugins import directory
 
-from neutron.api.v2 import attributes
 from neutron.db import _resource_extend as resource_extend
 
 
@@ -34,7 +34,7 @@ class PortBindingBaseMixin(object):
             port_res.update(self.base_binding_dict)
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_binding(port_res, port_db):
         plugin = directory.get_plugin()
         if not isinstance(plugin, PortBindingBaseMixin):
diff --git a/neutron/db/portbindings_db.py b/neutron/db/portbindings_db.py
index 4de5b2ad7ba..6bb2922b4f1 100644
--- a/neutron/db/portbindings_db.py
+++ b/neutron/db/portbindings_db.py
@@ -13,11 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api import validators
 from neutron_lib.plugins import directory
 
-from neutron.api.v2 import attributes
 from neutron.db import _model_query as model_query
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
@@ -103,7 +103,7 @@ class PortBindingMixin(portbindings_base.PortBindingBaseMixin):
         self._extend_port_dict_binding_host(port_res, host)
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_binding(port_res, port_db):
         plugin = directory.get_plugin()
         if not isinstance(plugin, PortBindingMixin):
diff --git a/neutron/db/portsecurity_db.py b/neutron/db/portsecurity_db.py
index d1116d3bc85..aa95acf4b66 100644
--- a/neutron/db/portsecurity_db.py
+++ b/neutron/db/portsecurity_db.py
@@ -12,12 +12,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api.definitions import port_security as psec
 from neutron_lib.api import validators
 from neutron_lib.plugins import directory
 from neutron_lib.utils import net
 
-from neutron.api.v2 import attributes as attrs
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import portsecurity_db_common
 
@@ -26,7 +27,8 @@ from neutron.db import portsecurity_db_common
 class PortSecurityDbMixin(portsecurity_db_common.PortSecurityDbCommon):
 
     @staticmethod
-    @resource_extend.extends([attrs.NETWORKS, attrs.PORTS])
+    @resource_extend.extends([net_def.COLLECTION_NAME,
+                              port_def.COLLECTION_NAME])
     def _extend_port_security_dict(response_data, db_data):
         plugin = directory.get_plugin()
         if ('port-security' in
diff --git a/neutron/db/securitygroups_db.py b/neutron/db/securitygroups_db.py
index 3bdf6b98ce4..a48d152e0e8 100644
--- a/neutron/db/securitygroups_db.py
+++ b/neutron/db/securitygroups_db.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 import netaddr
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api import validators
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import exceptions
@@ -27,7 +28,6 @@ import six
 from sqlalchemy.orm import scoped_session
 
 from neutron._i18n import _
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import utils
 from neutron.db import _model_query as model_query
@@ -701,7 +701,7 @@ class SecurityGroupDbMixin(ext_sg.SecurityGroupPluginBase):
             **kwargs)
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_security_group(port_res, port_db):
         # Security group bindings will be retrieved from the SQLAlchemy
         # model. As they're loaded eagerly with ports because of the
diff --git a/neutron/db/subnet_service_type_db_models.py b/neutron/db/subnet_service_type_db_models.py
index 22e77d89998..a95a3e969f7 100644
--- a/neutron/db/subnet_service_type_db_models.py
+++ b/neutron/db/subnet_service_type_db_models.py
@@ -16,7 +16,8 @@
 # TODO(ihrachys): consider renaming the module since now it does not contain
 # any models at all
 
-from neutron.api.v2 import attributes
+from neutron_lib.api.definitions import subnet as subnet_def
+
 from neutron.db import _resource_extend as resource_extend
 
 
@@ -25,7 +26,7 @@ class SubnetServiceTypeMixin(object):
     """Mixin class to extend subnet with service type attribute"""
 
     @staticmethod
-    @resource_extend.extends([attributes.SUBNETS])
+    @resource_extend.extends([subnet_def.COLLECTION_NAME])
     def _extend_subnet_service_types(subnet_res, subnet_db):
         subnet_res['service_types'] = [service_type['service_type'] for
                                        service_type in
diff --git a/neutron/db/vlantransparent_db.py b/neutron/db/vlantransparent_db.py
index 33f76748077..588ae4fcc3c 100644
--- a/neutron/db/vlantransparent_db.py
+++ b/neutron/db/vlantransparent_db.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.api.v2 import attributes
+from neutron_lib.api.definitions import network as net_def
+
 from neutron.db import _resource_extend as resource_extend
 from neutron.extensions import vlantransparent
 
@@ -22,7 +23,7 @@ class Vlantransparent_db_mixin(object):
     """Mixin class to add vlan transparent methods to db_base_plugin_v2."""
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_network_dict_vlan_transparent(network_res, network_db):
         network_res[vlantransparent.VLANTRANSPARENT] = (
             network_db.vlan_transparent)
diff --git a/neutron/extensions/address_scope.py b/neutron/extensions/address_scope.py
index d601376f3b0..b463df20b55 100644
--- a/neutron/extensions/address_scope.py
+++ b/neutron/extensions/address_scope.py
@@ -15,6 +15,8 @@
 import abc
 
 from neutron_lib.api import converters
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib.api import extensions as api_extensions
 from neutron_lib import constants
 from neutron_lib.db import constants as db_const
@@ -64,14 +66,14 @@ RESOURCE_ATTRIBUTE_MAP = {
                        'validate': {'type:values': [4, 6]},
                        'is_visible': True},
     },
-    attr.SUBNETPOOLS: {
+    subnetpool_def.COLLECTION_NAME: {
         ADDRESS_SCOPE_ID: {'allow_post': True,
                            'allow_put': True,
                            'default': constants.ATTR_NOT_SPECIFIED,
                            'validate': {'type:uuid_or_none': None},
                            'is_visible': True}
     },
-    attr.NETWORKS: {
+    net_def.COLLECTION_NAME: {
         IPV4_ADDRESS_SCOPE: {'allow_post': False,
                              'allow_put': False,
                              'is_visible': True},
diff --git a/neutron/extensions/default_subnetpools.py b/neutron/extensions/default_subnetpools.py
index 24ae6b6beb1..6e9f3dd528d 100644
--- a/neutron/extensions/default_subnetpools.py
+++ b/neutron/extensions/default_subnetpools.py
@@ -12,14 +12,13 @@
 #    under the License.
 
 from neutron_lib.api import converters
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib.api import extensions
 from neutron_lib import constants
 
-from neutron.api.v2 import attributes
-
 
 EXTENDED_ATTRIBUTES_2_0 = {
-    attributes.SUBNETS: {
+    subnet_def.COLLECTION_NAME: {
         'use_default_subnetpool': {'allow_post': True,
                                    'allow_put': False,
                                    'default': False,
diff --git a/neutron/extensions/dns.py b/neutron/extensions/dns.py
index 0e8e2a77c29..546aad1e71a 100644
--- a/neutron/extensions/dns.py
+++ b/neutron/extensions/dns.py
@@ -15,6 +15,7 @@
 
 import re
 
+from neutron_lib.api.definitions import network as net_def
 from neutron_lib.api import extensions
 from neutron_lib.api import validators
 from neutron_lib import exceptions as n_exc
@@ -22,7 +23,6 @@ from oslo_config import cfg
 import six
 
 from neutron._i18n import _
-from neutron.api.v2 import attributes as attr
 from neutron.extensions import l3
 
 DNS_LABEL_MAX_LEN = 63
@@ -226,7 +226,7 @@ EXTENDED_ATTRIBUTES_2_0 = {
                     'validate': {'type:dns_domain': FQDN_MAX_LEN},
                     'is_visible': True},
     },
-    attr.NETWORKS: {
+    net_def.COLLECTION_NAME: {
         DNSDOMAIN: {'allow_post': True, 'allow_put': True,
                     'default': '',
                     'convert_to': convert_to_lowercase,
diff --git a/neutron/extensions/ip_allocation.py b/neutron/extensions/ip_allocation.py
index 8e43a4d86f2..4aac7bdf5d8 100644
--- a/neutron/extensions/ip_allocation.py
+++ b/neutron/extensions/ip_allocation.py
@@ -12,9 +12,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api import extensions
 
-from neutron.api.v2 import attributes
 
 IP_ALLOCATION = 'ip_allocation'
 IP_ALLOCATION_IMMEDIATE = 'immediate'
@@ -23,7 +23,7 @@ IP_ALLOCATION_NONE = 'none'
 
 # Attribute Map
 RESOURCE_ATTRIBUTE_MAP = {
-    attributes.PORTS: {
+    port_def.COLLECTION_NAME: {
         IP_ALLOCATION: {'allow_post': False,
                         'allow_put': False,
                         'is_visible': True, },
diff --git a/neutron/extensions/segment.py b/neutron/extensions/segment.py
index 3f2627ea704..422efd8ac61 100644
--- a/neutron/extensions/segment.py
+++ b/neutron/extensions/segment.py
@@ -17,13 +17,13 @@ import six
 
 from neutron_lib.api import converters
 from neutron_lib.api.definitions import provider_net as providernet
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib.api import extensions as api_extensions
 from neutron_lib import constants
 from neutron_lib.db import constants as db_const
 from neutron_lib.plugins import directory
 
 from neutron.api import extensions
-from neutron.api.v2 import attributes
 from neutron.api.v2 import base
 
 SEGMENT = 'segment'
@@ -80,7 +80,7 @@ RESOURCE_ATTRIBUTE_MAP = {
                         'validate': {'type:string_or_none': DESC_LEN},
                         'is_visible': True},
     },
-    attributes.SUBNETS: {
+    subnet_def.COLLECTION_NAME: {
         SEGMENT_ID: {'allow_post': True,
                      'allow_put': False,
                      'default': None,
diff --git a/neutron/extensions/subnet_service_types.py b/neutron/extensions/subnet_service_types.py
index 94000767c45..055d18d68e0 100644
--- a/neutron/extensions/subnet_service_types.py
+++ b/neutron/extensions/subnet_service_types.py
@@ -10,6 +10,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib.api import extensions
 from neutron_lib.api import validators
 from neutron_lib import constants
@@ -18,7 +19,6 @@ import six
 import webob.exc
 
 from neutron._i18n import _
-from neutron.api.v2 import attributes
 
 
 # List for service plugins to register their own prefixes
@@ -57,7 +57,7 @@ validators.add_validator('type:validate_subnet_service_types',
 
 
 EXTENDED_ATTRIBUTES_2_0 = {
-    attributes.SUBNETS: {
+    subnet_def.COLLECTION_NAME: {
         'service_types': {'allow_post': True,
                           'allow_put': True,
                           'default': constants.ATTR_NOT_SPECIFIED,
diff --git a/neutron/extensions/tag.py b/neutron/extensions/tag.py
index ab5a3c7a4aa..d8f3a9b3d4a 100644
--- a/neutron/extensions/tag.py
+++ b/neutron/extensions/tag.py
@@ -13,6 +13,7 @@
 
 import abc
 
+from neutron_lib.api.definitions import network
 from neutron_lib.api import extensions as api_extensions
 from neutron_lib.api import validators
 from neutron_lib import exceptions
@@ -23,7 +24,6 @@ import webob.exc
 
 from neutron._i18n import _
 from neutron.api import extensions
-from neutron.api.v2 import attributes
 from neutron.api.v2 import base
 from neutron.api.v2 import resource as api_resource
 from neutron.common import rpc as n_rpc
@@ -37,7 +37,7 @@ TAG_PLUGIN_TYPE = 'TAG'
 TAG_SUPPORTED_RESOURCES = {
     # We shouldn't add new resources here. If more resources need to be tagged,
     # we must add them in new extension.
-    attributes.NETWORKS: attributes.NETWORK,
+    network.COLLECTION_NAME: network.RESOURCE_NAME,
 }
 
 TAG_ATTRIBUTE_MAP = {
diff --git a/neutron/extensions/tag_ext.py b/neutron/extensions/tag_ext.py
index e2517e24088..88d2c0aa48a 100644
--- a/neutron/extensions/tag_ext.py
+++ b/neutron/extensions/tag_ext.py
@@ -11,11 +11,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib.api import extensions as api_extensions
 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.api.v2 import resource as api_resource
 from neutron.extensions import l3
@@ -24,9 +26,9 @@ from neutron.extensions import tag as tag_base
 TAG_SUPPORTED_RESOURCES = {
     # We shouldn't add new resources here. If more resources need to be tagged,
     # we must add them in new extension.
-    attributes.SUBNETS: attributes.SUBNET,
-    attributes.PORTS: attributes.PORT,
-    attributes.SUBNETPOOLS: attributes.SUBNETPOOL,
+    subnet_def.COLLECTION_NAME: subnet_def.RESOURCE_NAME,
+    port_def.COLLECTION_NAME: port_def.RESOURCE_NAME,
+    subnetpool_def.COLLECTION_NAME: subnetpool_def.RESOURCE_NAME,
     l3.ROUTERS: l3.ROUTER,
 }
 
diff --git a/neutron/plugins/common/utils.py b/neutron/plugins/common/utils.py
index 2af88f47398..638dcb3fe45 100644
--- a/neutron/plugins/common/utils.py
+++ b/neutron/plugins/common/utils.py
@@ -21,6 +21,9 @@ import contextlib
 import hashlib
 
 from neutron_lib.api import attributes as lib_attrs
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib import constants as n_const
 from neutron_lib import exceptions
 from oslo_config import cfg
@@ -166,21 +169,21 @@ def _fixup_res_dict(context, attr_name, res_dict, check_allow_post=True):
 
 
 def create_network(core_plugin, context, net, check_allow_post=True):
-    net_data = _fixup_res_dict(context, attributes.NETWORKS,
+    net_data = _fixup_res_dict(context, net_def.COLLECTION_NAME,
                                net.get('network', {}),
                                check_allow_post=check_allow_post)
     return core_plugin.create_network(context, {'network': net_data})
 
 
 def create_subnet(core_plugin, context, subnet, check_allow_post=True):
-    subnet_data = _fixup_res_dict(context, attributes.SUBNETS,
+    subnet_data = _fixup_res_dict(context, subnet_def.COLLECTION_NAME,
                                   subnet.get('subnet', {}),
                                   check_allow_post=check_allow_post)
     return core_plugin.create_subnet(context, {'subnet': subnet_data})
 
 
 def create_port(core_plugin, context, port, check_allow_post=True):
-    port_data = _fixup_res_dict(context, attributes.PORTS,
+    port_data = _fixup_res_dict(context, port_def.COLLECTION_NAME,
                                 port.get('port', {}),
                                 check_allow_post=check_allow_post)
     return core_plugin.create_port(context, {'port': port_data})
diff --git a/neutron/plugins/ml2/plugin.py b/neutron/plugins/ml2/plugin.py
index 778080e5269..1305d3847f9 100644
--- a/neutron/plugins/ml2/plugin.py
+++ b/neutron/plugins/ml2/plugin.py
@@ -15,9 +15,12 @@
 
 from eventlet import greenthread
 from neutron_lib.api.definitions import extra_dhcp_opt as edo_ext
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
 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
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib.api import validators
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import exceptions
@@ -48,7 +51,6 @@ from neutron.api.rpc.handlers import dvr_rpc
 from neutron.api.rpc.handlers import metadata_rpc
 from neutron.api.rpc.handlers import resources_rpc
 from neutron.api.rpc.handlers import securitygroups_rpc
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import rpc as n_rpc
 from neutron.common import topics
@@ -349,7 +351,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
             port['status'] = const.PORT_STATUS_DOWN
             super(Ml2Plugin, self).update_port(
                 mech_context._plugin_context, port_id,
-                {attributes.PORT: {'status': const.PORT_STATUS_DOWN}})
+                {port_def.RESOURCE_NAME: {'status': const.PORT_STATUS_DOWN}})
 
         if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE:
             binding.vif_type = portbindings.VIF_TYPE_UNBOUND
@@ -606,7 +608,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
         return {}
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _ml2_extend_port_dict_binding(port_res, port_db):
         plugin = directory.get_plugin()
         # None when called during unit tests for other plugins.
@@ -617,21 +619,21 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     # attributes for the resources to add those attributes to the result.
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _ml2_md_extend_network_dict(result, netdb):
         plugin = directory.get_plugin()
         session = plugin._object_session_or_new_session(netdb)
         plugin.extension_manager.extend_network_dict(session, netdb, result)
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _ml2_md_extend_port_dict(result, portdb):
         plugin = directory.get_plugin()
         session = plugin._object_session_or_new_session(portdb)
         plugin.extension_manager.extend_port_dict(session, portdb, result)
 
     @staticmethod
-    @resource_extend.extends([attributes.SUBNETS])
+    @resource_extend.extends([subnet_def.COLLECTION_NAME])
     def _ml2_md_extend_subnet_dict(result, subnetdb):
         plugin = directory.get_plugin()
         session = plugin._object_session_or_new_session(subnetdb)
@@ -755,12 +757,12 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
         return min(mtus) if mtus else 0
 
     def _before_create_network(self, context, network):
-        net_data = network[attributes.NETWORK]
+        net_data = network[net_def.RESOURCE_NAME]
         registry.notify(resources.NETWORK, events.BEFORE_CREATE, self,
                         context=context, network=net_data)
 
     def _create_network_db(self, context, network):
-        net_data = network[attributes.NETWORK]
+        net_data = network[net_def.RESOURCE_NAME]
         tenant_id = net_data['tenant_id']
         with db_api.context_manager.writer.using(context):
             net_db = self.create_network_db(context, network)
@@ -820,13 +822,14 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def create_network_bulk(self, context, networks):
-        objects = self._create_bulk_ml2(attributes.NETWORK, context, networks)
+        objects = self._create_bulk_ml2(
+            net_def.RESOURCE_NAME, context, networks)
         return [obj['result'] for obj in objects]
 
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def update_network(self, context, id, network):
-        net_data = network[attributes.NETWORK]
+        net_data = network[net_def.RESOURCE_NAME]
         provider._raise_if_updates_provider_attributes(net_data)
 
         with db_api.context_manager.writer.using(context):
@@ -961,7 +964,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
             result, net_db, ipam_sub = self._create_subnet_precommit(
                 context, subnet)
             self.extension_manager.process_create_subnet(
-                context, subnet[attributes.SUBNET], result)
+                context, subnet[subnet_def.RESOURCE_NAME], result)
             network = self._make_network_dict(net_db, context=context)
             self.type_manager.extend_network_dict_provider(context, network)
             network[api.MTU] = self._get_network_mtu(network)
@@ -997,7 +1000,8 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def create_subnet_bulk(self, context, subnets):
-        objects = self._create_bulk_ml2(attributes.SUBNET, context, subnets)
+        objects = self._create_bulk_ml2(
+            subnet_def.RESOURCE_NAME, context, subnets)
         return [obj['result'] for obj in objects]
 
     @utils.transaction_guard
@@ -1007,7 +1011,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
             updated_subnet, original_subnet = self._update_subnet_precommit(
                 context, id, subnet)
             self.extension_manager.process_update_subnet(
-                context, subnet[attributes.SUBNET], updated_subnet)
+                context, subnet[subnet_def.RESOURCE_NAME], updated_subnet)
             updated_subnet = self.get_subnet(context, id)
             mech_context = driver_context.SubnetContext(
                 self, context, updated_subnet, network=None,
@@ -1057,7 +1061,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     # TODO(yalei) - will be simplified after security group and address pair be
     # converted to ext driver too.
     def _portsec_ext_port_create_processing(self, context, port_data, port):
-        attrs = port[attributes.PORT]
+        attrs = port[port_def.RESOURCE_NAME]
         port_security = ((port_data.get(psec.PORTSECURITY) is None) or
                          port_data[psec.PORTSECURITY])
 
@@ -1091,7 +1095,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                 provisioning_blocks.DHCP_ENTITY)
 
     def _before_create_port(self, context, port):
-        attrs = port[attributes.PORT]
+        attrs = port[port_def.RESOURCE_NAME]
         if not attrs.get('status'):
             attrs['status'] = const.PORT_STATUS_DOWN
 
@@ -1102,7 +1106,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
         self._ensure_default_security_group(context, attrs['tenant_id'])
 
     def _create_port_db(self, context, port):
-        attrs = port[attributes.PORT]
+        attrs = port[port_def.RESOURCE_NAME]
         with db_api.context_manager.writer.using(context):
             dhcp_opts = attrs.get(edo_ext.EXTRADHCPOPTS, [])
             port_db = self.create_port_db(context, port)
@@ -1166,7 +1170,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def create_port_bulk(self, context, ports):
-        objects = self._create_bulk_ml2(attributes.PORT, context, ports)
+        objects = self._create_bulk_ml2(port_def.RESOURCE_NAME, context, ports)
         return [obj['result'] for obj in objects]
 
     # TODO(yalei) - will be simplified after security group and address pair be
@@ -1215,7 +1219,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def update_port(self, context, id, port):
-        attrs = port[attributes.PORT]
+        attrs = port[port_def.RESOURCE_NAME]
         need_port_update_notify = False
         bound_mech_contexts = []
         with db_api.context_manager.writer.using(context):
@@ -1371,7 +1375,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
     @utils.transaction_guard
     @db_api.retry_if_session_inactive()
     def update_distributed_port_binding(self, context, id, port):
-        attrs = port[attributes.PORT]
+        attrs = port[port_def.RESOURCE_NAME]
 
         host = attrs and attrs.get(portbindings.HOST_ID)
         host_set = validators.is_attr_set(host)
diff --git a/neutron/services/auto_allocate/db.py b/neutron/services/auto_allocate/db.py
index 48910ce573b..d8f6fdf97b8 100644
--- a/neutron/services/auto_allocate/db.py
+++ b/neutron/services/auto_allocate/db.py
@@ -14,6 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import network as net_def
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
@@ -23,7 +24,6 @@ from neutron_lib.plugins import directory
 from oslo_log import log as logging
 
 from neutron._i18n import _, _LE
-from neutron.api.v2 import attributes
 from neutron.common import exceptions as c_exc
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import _utils as db_utils
@@ -108,7 +108,7 @@ class AutoAllocatedTopologyMixin(common_db_mixin.CommonDbMixin):
         return self._l3_plugin
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_external_network_default(net_res, net_db):
         """Add is_default field to 'show' response."""
         if net_db.external is not None:
diff --git a/neutron/services/segments/plugin.py b/neutron/services/segments/plugin.py
index 67242c03c22..e6465c4ab01 100644
--- a/neutron/services/segments/plugin.py
+++ b/neutron/services/segments/plugin.py
@@ -16,6 +16,9 @@
 
 from keystoneauth1 import loading as ks_loading
 import netaddr
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
@@ -27,7 +30,6 @@ from oslo_config import cfg
 from oslo_log import log
 
 from neutron._i18n import _, _LE, _LI
-from neutron.api.v2 import attributes
 from neutron.common import exceptions as n_exc
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
@@ -61,7 +63,7 @@ class Plugin(db.SegmentDbMixin, segment.SegmentPluginBase):
         self.nova_updater = NovaSegmentNotifier()
 
     @staticmethod
-    @resource_extend.extends([attributes.NETWORKS])
+    @resource_extend.extends([net_def.COLLECTION_NAME])
     def _extend_network_dict_binding(network_res, network_db):
         if not directory.get_plugin('segments'):
             return
@@ -73,12 +75,12 @@ class Plugin(db.SegmentDbMixin, segment.SegmentPluginBase):
         network_res[l2_adjacency.L2_ADJACENCY] = is_adjacent
 
     @staticmethod
-    @resource_extend.extends([attributes.SUBNETS])
+    @resource_extend.extends([subnet_def.COLLECTION_NAME])
     def _extend_subnet_dict_binding(subnet_res, subnet_db):
         subnet_res['segment_id'] = subnet_db.get('segment_id')
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_dict_binding(port_res, port_db):
         if not directory.get_plugin('segments'):
             return
diff --git a/neutron/services/tag/tag_plugin.py b/neutron/services/tag/tag_plugin.py
index 5e423f7bf2a..afeae84b789 100644
--- a/neutron/services/tag/tag_plugin.py
+++ b/neutron/services/tag/tag_plugin.py
@@ -14,11 +14,14 @@
 
 import functools
 
+from neutron_lib.api.definitions import network as net_def
+from neutron_lib.api.definitions import port as port_def
+from neutron_lib.api.definitions import subnet as subnet_def
+from neutron_lib.api.definitions import subnetpool as subnetpool_def
 from neutron_lib.plugins import directory
 from oslo_log import helpers as log_helpers
 from sqlalchemy.orm import exc
 
-from neutron.api.v2 import attributes
 from neutron.db import _model_query as model_query
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
@@ -36,10 +39,10 @@ from neutron.objects import tag as tag_obj
 resource_model_map = {
     # When we'll add other resources, we must add new extension for them
     # if we don't have better discovery mechanism instead of it.
-    attributes.NETWORKS: models_v2.Network,
-    attributes.SUBNETS: models_v2.Subnet,
-    attributes.PORTS: models_v2.Port,
-    attributes.SUBNETPOOLS: models_v2.SubnetPool,
+    net_def.COLLECTION_NAME: models_v2.Network,
+    subnet_def.COLLECTION_NAME: models_v2.Subnet,
+    port_def.COLLECTION_NAME: models_v2.Port,
+    subnetpool_def.COLLECTION_NAME: models_v2.SubnetPool,
     l3_ext.ROUTERS: l3_model.Router,
 }
 
diff --git a/neutron/services/trunk/plugin.py b/neutron/services/trunk/plugin.py
index a469fbbc10e..f5043de61fd 100644
--- a/neutron/services/trunk/plugin.py
+++ b/neutron/services/trunk/plugin.py
@@ -14,6 +14,7 @@
 
 import copy
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
@@ -24,7 +25,6 @@ from neutron_lib.services import base as service_base
 from oslo_log import log as logging
 from oslo_utils import uuidutils
 
-from neutron.api.v2 import attributes
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
 from neutron.db import common_db_mixin
@@ -66,7 +66,7 @@ class TrunkPlugin(service_base.ServicePluginBase,
         self.check_compatibility()
 
     @staticmethod
-    @resource_extend.extends([attributes.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_trunk_details(port_res, port_db):
         """Add trunk details to a port."""
         if port_db.trunk_port:
diff --git a/neutron/tests/unit/extensions/test_data_plane_status.py b/neutron/tests/unit/extensions/test_data_plane_status.py
index edbc0a0fa3c..767a2813346 100644
--- a/neutron/tests/unit/extensions/test_data_plane_status.py
+++ b/neutron/tests/unit/extensions/test_data_plane_status.py
@@ -15,9 +15,9 @@
 from webob import exc as web_exc
 
 from neutron_lib.api.definitions import data_plane_status as dps_lib
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib import constants
 
-from neutron.api.v2 import attributes as attrs
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import data_plane_status_db as dps_db
 from neutron.db import db_base_plugin_v2
@@ -48,7 +48,7 @@ class DataPlaneStatusExtensionTestPlugin(db_base_plugin_v2.NeutronDbPluginV2,
     supported_extension_aliases = ["data-plane-status"]
 
     @staticmethod
-    @resource_extend.extends([attrs.PORTS])
+    @resource_extend.extends([port_def.COLLECTION_NAME])
     def _extend_port_data_plane_status(port_res, port_db):
         return dps_db.DataPlaneStatusMixin._extend_port_data_plane_status(
             port_res, port_db)
@@ -77,7 +77,7 @@ class DataPlaneStatusExtensionTestCase(
     def test_update_port_data_plane_status(self):
         with self.port() as port:
             data = {'port': {'data_plane_status': constants.ACTIVE}}
-            req = self.new_update_request(attrs.PORTS,
+            req = self.new_update_request(port_def.COLLECTION_NAME,
                                           data,
                                           port['port']['id'])
             res = req.get_response(self.api)
@@ -87,7 +87,8 @@ class DataPlaneStatusExtensionTestCase(
 
     def test_port_create_data_plane_status_default_none(self):
         with self.port(name='port1') as port:
-            req = self.new_show_request(attrs.PORTS, port['port']['id'])
+            req = self.new_show_request(
+                port_def.COLLECTION_NAME, port['port']['id'])
             res = self.deserialize(self.fmt, req.get_response(self.api))
             self.assertIsNone(res['port'][dps_lib.DATA_PLANE_STATUS])
 
@@ -102,10 +103,10 @@ class DataPlaneStatusExtensionTestCase(
 
     def test_port_update_preserves_data_plane_status(self):
         with self.port(name='port1') as port:
-            res = self._update(attrs.PORTS, port['port']['id'],
+            res = self._update(port_def.COLLECTION_NAME, port['port']['id'],
                                {'port': {dps_lib.DATA_PLANE_STATUS:
                                          constants.ACTIVE}})
-            res = self._update(attrs.PORTS, port['port']['id'],
+            res = self._update(port_def.COLLECTION_NAME, port['port']['id'],
                                {'port': {'name': 'port2'}})
             self.assertEqual(res['port']['name'], 'port2')
             self.assertEqual(res['port'][dps_lib.DATA_PLANE_STATUS],
@@ -113,7 +114,7 @@ class DataPlaneStatusExtensionTestCase(
 
     def test_port_update_with_invalid_data_plane_status(self):
         with self.port(name='port1') as port:
-            self._update(attrs.PORTS, port['port']['id'],
+            self._update(port_def.COLLECTION_NAME, port['port']['id'],
                          {'port': {dps_lib.DATA_PLANE_STATUS: "abc"}},
                          web_exc.HTTPBadRequest.code)
 
@@ -121,7 +122,7 @@ class DataPlaneStatusExtensionTestCase(
         expect_notify = set(['port.update.start',
                              'port.update.end'])
         with self.port(name='port1') as port:
-            self._update(attrs.PORTS, port['port']['id'],
+            self._update(port_def.COLLECTION_NAME, port['port']['id'],
                          {'port': {dps_lib.DATA_PLANE_STATUS:
                                    constants.ACTIVE}})
             notify = set(n['event_type'] for n in fake_notifier.NOTIFICATIONS)
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 def682a6341..5b93a3aa582 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
@@ -15,6 +15,7 @@
 
 import mock
 
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import provider_net as pnet
 from neutron_lib import constants
@@ -25,7 +26,6 @@ from neutron_lib.plugins import directory
 from oslo_serialization import jsonutils
 import testtools
 
-from neutron.api.v2 import attributes
 from neutron.common import constants as n_const
 from neutron.common import topics
 from neutron.db import agents_db
@@ -237,7 +237,7 @@ class TestL2PopulationRpcTestCase(test_plugin.Ml2PluginV2TestCase):
             else:
                 port[portbindings.HOST_ID] = self.agent2['host']
             plugin.update_port(self.adminContext, port['id'],
-                               {attributes.PORT: port})
+                               {port_def.RESOURCE_NAME: port})
 
     def _get_first_interface(self, net_id, router_id):
         plugin = directory.get_plugin()
diff --git a/neutron/tests/unit/plugins/ml2/extensions/test_data_plane_status.py b/neutron/tests/unit/plugins/ml2/extensions/test_data_plane_status.py
index e098167e704..25abbd867eb 100644
--- a/neutron/tests/unit/plugins/ml2/extensions/test_data_plane_status.py
+++ b/neutron/tests/unit/plugins/ml2/extensions/test_data_plane_status.py
@@ -15,11 +15,11 @@
 import mock
 
 from neutron_lib.api.definitions import data_plane_status as dps_lib
+from neutron_lib.api.definitions import port as port_def
 from neutron_lib import constants
 from neutron_lib import context
 from neutron_lib.plugins import directory
 
-from neutron.api.v2 import attributes as attrs
 from neutron.plugins.ml2 import config
 from neutron.plugins.ml2.extensions import data_plane_status
 from neutron.tests.unit.plugins.ml2 import test_plugin
@@ -47,7 +47,8 @@ class DataPlaneStatusSML2ExtDriverTestCase(test_plugin.Ml2PluginV2TestCase):
 
     def test_show_port_has_data_plane_status(self):
         with self.port() as port:
-            req = self.new_show_request(attrs.PORTS, port['port']['id'],
+            req = self.new_show_request(port_def.COLLECTION_NAME,
+                                        port['port']['id'],
                                         self.fmt)
             p = self.deserialize(self.fmt, req.get_response(self.api))
             self.assertIsNone(p['port'][dps_lib.DATA_PLANE_STATUS])
@@ -57,7 +58,8 @@ class DataPlaneStatusSML2ExtDriverTestCase(test_plugin.Ml2PluginV2TestCase):
             admin_ctx = context.get_admin_context()
             p = {'port': {dps_lib.DATA_PLANE_STATUS: constants.ACTIVE}}
             self.plugin.update_port(admin_ctx, port['port']['id'], p)
-            req = self.new_show_request(attrs.PORTS, port['port']['id'])
+            req = self.new_show_request(
+                port_def.COLLECTION_NAME, port['port']['id'])
             res = self.deserialize(self.fmt, req.get_response(self.api))
             self.assertEqual(res['port'][dps_lib.DATA_PLANE_STATUS],
                              constants.ACTIVE)