diff --git a/nova/compute/manager.py b/nova/compute/manager.py
index b066b6cc011d..f55ef9b16513 100644
--- a/nova/compute/manager.py
+++ b/nova/compute/manager.py
@@ -8046,7 +8046,7 @@ class ComputeManager(manager.Manager):
                 LOG.info('Destination was ready for NUMA live migration, '
                          'but source is either too old, or is set to an '
                          'older upgrade level.', instance=instance)
-            if self.network_api.supports_port_binding_extension(ctxt):
+            if self.network_api.has_port_binding_extension(ctxt):
                 # Create migrate_data vifs if not provided by driver.
                 if 'vifs' not in migrate_data:
                     migrate_data.vifs = (
diff --git a/nova/conductor/tasks/cross_cell_migrate.py b/nova/conductor/tasks/cross_cell_migrate.py
index d66394cb6e32..e04378f805c6 100644
--- a/nova/conductor/tasks/cross_cell_migrate.py
+++ b/nova/conductor/tasks/cross_cell_migrate.py
@@ -698,7 +698,7 @@ class CrossCellMigrationTask(base.TaskBase):
         LOG.debug('Making sure neutron is new enough for cross-cell resize.')
         # Check that the port binding-extended API extension is available in
         # neutron because if it's not we can just fail fast.
-        if not self.network_api.supports_port_binding_extension(self.context):
+        if not self.network_api.has_port_binding_extension(self.context):
             raise exception.MigrationPreCheckError(
                 reason=_("Required networking service API extension '%s' "
                          "not found.") %
diff --git a/nova/conductor/tasks/live_migrate.py b/nova/conductor/tasks/live_migrate.py
index 294abfe4e342..1acae88b2645 100644
--- a/nova/conductor/tasks/live_migrate.py
+++ b/nova/conductor/tasks/live_migrate.py
@@ -245,8 +245,7 @@ class LiveMigrationTask(base.TaskBase):
                             "are not allowed for live migration.")
         # All PCI requests are VIF related, now check neutron,
         # source and destination compute nodes.
-        if not self.network_api.supports_port_binding_extension(
-                self.context):
+        if not self.network_api.has_port_binding_extension(self.context):
             raise exception.MigrationPreCheckError(
                 reason="Cannot live migrate VIF with related PCI, Neutron "
                        "does not support required port binding extension.")
@@ -366,7 +365,7 @@ class LiveMigrationTask(base.TaskBase):
             raise exception.MigrationPreCheckError(msg)
 
         # Check to see that neutron supports the binding-extended API.
-        if self.network_api.supports_port_binding_extension(self.context):
+        if self.network_api.has_port_binding_extension(self.context):
             bindings = self._bind_ports_on_destination(
                 destination, provider_mapping)
             self._update_migrate_vifs_from_bindings(self.migrate_data.vifs,
diff --git a/nova/network/constants.py b/nova/network/constants.py
index 4a08c870f6c6..eff49022c16a 100644
--- a/nova/network/constants.py
+++ b/nova/network/constants.py
@@ -13,23 +13,40 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-QOS_QUEUE = 'QoS Queue'
-NET_EXTERNAL = 'router:external'
-VNIC_INDEX_EXT = 'VNIC Index'
-DNS_INTEGRATION = 'DNS Integration'
-MULTI_NET_EXT = 'Multi Provider Network'
-FIP_PORT_DETAILS = 'Floating IP Port Details Extension'
-SUBSTR_PORT_FILTERING = 'IP address substring filtering'
-PORT_BINDING = 'Port Binding'
-PORT_BINDING_EXTENDED = 'Port Bindings Extended'
-DEFAULT_SECGROUP = 'default'
+# Port fields
+
 BINDING_PROFILE = 'binding:profile'
 BINDING_HOST_ID = 'binding:host_id'
-MIGRATING_ATTR = 'migrating_to'
-L3_NETWORK_TYPES = ['vxlan', 'gre', 'geneve']
-ALLOCATION = 'allocation'
 RESOURCE_REQUEST = 'resource_request'
 REQUEST_GROUPS = 'request_groups'
-SEGMENT = 'Segment'
 NUMA_POLICY = 'numa_affinity_policy'
-RESOURCE_REQUEST_GROUPS_EXTENSION = "Port Resource Request Groups"
+
+# Binding profile fields
+
+MIGRATING_ATTR = 'migrating_to'
+ALLOCATION = 'allocation'
+
+# Core extensions
+
+DNS_INTEGRATION = 'dns-integration'
+MULTI_PROVIDER = 'multi-provider'
+FIP_PORT_DETAILS = 'fip-port-details'
+PORT_BINDING = 'binding'
+PORT_BINDING_EXTENDED = 'binding-extended'
+SUBSTR_PORT_FILTERING = 'ip-substring-filtering'
+SEGMENT = 'segment'
+RESOURCE_REQUEST_GROUPS = 'port-resource-request-groups'
+
+# Third-party extensions
+
+VNIC_INDEX = 'vnic-index'  # this is provided by the vmware_nsx project
+QOS_QUEUE = 'qos-queue'  # TODO(stephenfin): what defines this? Xen?
+
+# Search fields
+
+NET_EXTERNAL = 'router:external'
+
+# Misc
+
+DEFAULT_SECGROUP = 'default'
+L3_NETWORK_TYPES = ['vxlan', 'gre', 'geneve']
diff --git a/nova/network/neutron.py b/nova/network/neutron.py
index 294ccaebbecb..a3c7afdb7c60 100644
--- a/nova/network/neutron.py
+++ b/nova/network/neutron.py
@@ -382,7 +382,8 @@ class API:
                 # If a host was provided, delete any bindings between that
                 # host and the ports as long as the host isn't the same as
                 # the current instance.host.
-                has_binding_ext = self.supports_port_binding_extension(context)
+                has_binding_ext = self.has_port_binding_extension(
+                    client=admin_client)
                 if port_migrating and has_binding_ext:
                     self._delete_port_bindings(context, ports, host)
             elif port_migrating:
@@ -676,8 +677,12 @@ class API:
             # NOTE: For internal DNS integration (network does not have a
             # dns_domain), or if we cannot retrieve network info, we use the
             # admin client to reset dns_name.
-            if self._has_dns_extension() and not network.get('dns_domain'):
+            if (
+                self.has_dns_extension(client=port_client) and
+                not network.get('dns_domain')
+            ):
                 port_req_body['port']['dns_name'] = ''
+
             try:
                 port_client.update_port(port_id, port_req_body)
             except neutron_client_exc.PortNotFoundClient:
@@ -1334,62 +1339,112 @@ class API:
         return (nets_in_requested_order, ports_in_requested_order,
             preexisting_port_ids, created_port_ids)
 
-    def _refresh_neutron_extensions_cache(self, context, neutron=None):
+    def _refresh_neutron_extensions_cache(self, client):
         """Refresh the neutron extensions cache when necessary."""
         if (not self.last_neutron_extension_sync or
             ((time.time() - self.last_neutron_extension_sync) >=
              CONF.neutron.extension_sync_interval)):
-            if neutron is None:
-                neutron = get_client(context)
-            extensions_list = neutron.list_extensions()['extensions']
+            extensions_list = client.list_extensions()['extensions']
             self.last_neutron_extension_sync = time.time()
             self.extensions.clear()
-            self.extensions = {ext['name']: ext for ext in extensions_list}
+            self.extensions = {ext['alias']: ext for ext in extensions_list}
 
-    def _has_multi_provider_extension(self, context, neutron=None):
-        self._refresh_neutron_extensions_cache(context, neutron=neutron)
-        return constants.MULTI_NET_EXT in self.extensions
+    def _has_extension(self, extension, context=None, client=None):
+        """Check if the provided neutron extension is enabled.
 
-    def _has_dns_extension(self):
-        return constants.DNS_INTEGRATION in self.extensions
+        :param extension: The alias of the extension to check
+        :param client: keystoneauth1.adapter.Adapter
+        :param context: nova.context.RequestContext
+        :returns: True if the neutron extension is available, else False
+        """
+        if client is None:
+            client = get_client(context)
 
-    def _has_qos_queue_extension(self, context, neutron=None):
-        self._refresh_neutron_extensions_cache(context, neutron=neutron)
-        return constants.QOS_QUEUE in self.extensions
+        self._refresh_neutron_extensions_cache(client)
+        return extension in self.extensions
 
-    def _has_fip_port_details_extension(self, context, neutron=None):
-        self._refresh_neutron_extensions_cache(context, neutron=neutron)
-        return constants.FIP_PORT_DETAILS in self.extensions
+    def has_multi_provider_extension(self, context=None, client=None):
+        """Check if the 'multi-provider' extension is enabled.
 
-    def has_substr_port_filtering_extension(self, context):
-        self._refresh_neutron_extensions_cache(context)
-        return constants.SUBSTR_PORT_FILTERING in self.extensions
+        This extension allows administrative users to define multiple physical
+        bindings for a logical network.
+        """
+        return self._has_extension(constants.MULTI_PROVIDER, context, client)
 
-    def _has_segment_extension(self, context, neutron=None):
-        self._refresh_neutron_extensions_cache(context, neutron=neutron)
-        return constants.SEGMENT in self.extensions
+    def has_dns_extension(self, context=None, client=None):
+        """Check if the 'dns-integration' extension is enabled.
+
+        This extension adds the 'dns_name' and 'dns_assignment' attributes to
+        port resources.
+        """
+        return self._has_extension(constants.DNS_INTEGRATION, context, client)
 
     # TODO(gibi): Remove all branches where this is False after Neutron made
     # the this extension mandatory. In Xena this extension will be optional to
     # support the scenario where Neutron upgraded first. So Neutron can mark
     # this mandatory earliest in Yoga.
-    def has_extended_resource_request_extension(self, context, neutron=None):
-        self._refresh_neutron_extensions_cache(context, neutron=neutron)
-        return constants.RESOURCE_REQUEST_GROUPS_EXTENSION in self.extensions
+    def has_extended_resource_request_extension(
+        self, context=None, client=None,
+    ):
+        return self._has_extension(
+            constants.RESOURCE_REQUEST_GROUPS, context, client,
+        )
 
-    def supports_port_binding_extension(self, context):
-        """This is a simple check to see if the neutron "binding-extended"
-        extension exists and is enabled.
+    # TODO(stephenfin): This is optionally used by the XenAPI virt driver, but
+    # I can't find what defines it and suspect it's dead code. Consider
+    # removing the functionality
+    def has_qos_queue_extension(self, context=None, client=None):
+        """Check if the 'qos-queue' extension is enabled.
 
-        The "binding-extended" extension allows nova to bind a port to multiple
-        hosts at the same time, like during live migration.
-
-        :param context: the user request context
-        :returns: True if the binding-extended API extension is available,
-                  False otherwise
+        This extension is provided by a XenServer neutron plugin...we think.
         """
-        self._refresh_neutron_extensions_cache(context)
-        return constants.PORT_BINDING_EXTENDED in self.extensions
+        return self._has_extension(constants.QOS_QUEUE, context, client)
+
+    def has_vnic_index_extension(self, context=None, client=None):
+        """Check if the 'vnic-index' extension is enabled.
+
+        This extension is provided by the VMWare NSX neutron plugin.
+        """
+        return self._has_extension(constants.VNIC_INDEX, context, client)
+
+    def has_fip_port_details_extension(self, context=None, client=None):
+        """Check if the 'fip-port-details' extension is enabled.
+
+        This extension adds the 'port_details' attribute to floating IPs.
+        """
+        return self._has_extension(constants.FIP_PORT_DETAILS, context, client)
+
+    def has_substr_port_filtering_extension(self, context=None, client=None):
+        """Check if the 'ip-substring-filtering' extension is enabled.
+
+        This extension adds support for filtering ports by using part of an IP
+        address.
+        """
+        return self._has_extension(
+            constants.SUBSTR_PORT_FILTERING, context, client
+        )
+
+    def has_segment_extension(self, context=None, client=None):
+        """Check if the neutron 'segment' extension is enabled.
+
+        This extension exposes information about L2 segments of a network.
+        """
+        return self._has_extension(
+            constants.SEGMENT, context, client,
+        )
+
+    def has_port_binding_extension(self, context=None, client=None):
+        """Check if the neutron 'binding-extended' extension is enabled.
+
+        This extensions exposes port bindings of a virtual port to external
+        application.
+
+        This extension allows nova to bind a port to multiple hosts at the same
+        time, like during live migration.
+        """
+        return self._has_extension(
+            constants.PORT_BINDING_EXTENDED, context, client
+        )
 
     def bind_ports_to_host(self, context, instance, host,
                            vnic_types=None, port_profiles=None):
@@ -1403,7 +1458,7 @@ class API:
         In the event of an error, any ports which were successfully bound to
         the host should have those host bindings removed from the ports.
 
-        This method should not be used if "supports_port_binding_extension"
+        This method should not be used if "has_port_binding_extension"
         returns False.
 
         :param context: the user request context
@@ -1482,7 +1537,7 @@ class API:
     def delete_port_binding(self, context, port_id, host):
         """Delete the port binding for the given port ID and host
 
-        This method should not be used if "supports_port_binding_extension"
+        This method should not be used if "has_port_binding_extension"
         returns False.
 
         :param context: The request context for the operation.
@@ -1602,7 +1657,10 @@ class API:
 
         If the extensions loaded contain QOS_QUEUE then pass the rxtx_factor.
         """
-        if self._has_qos_queue_extension(context, neutron=neutron):
+        if neutron is None:
+            neutron = get_client(context)
+
+        if self.has_qos_queue_extension(client=neutron):
             flavor = instance.get_flavor()
             rxtx_factor = flavor.get('rxtx_factor')
             port_req_body['port']['rxtx_factor'] = rxtx_factor
@@ -1612,7 +1670,7 @@ class API:
                                                port_req_body,
                                                port_arq)
 
-        if self._has_dns_extension():
+        if self.has_dns_extension(client=neutron):
             # If the DNS integration extension is enabled in Neutron, most
             # ports will get their dns_name attribute set in the port create or
             # update requests in allocate_for_instance. So we just add the
@@ -1638,7 +1696,8 @@ class API:
         an additional update request. Only a very small fraction of ports will
         require this additional update request.
         """
-        if self._has_dns_extension() and network.get('dns_domain'):
+        if self.has_dns_extension(client=neutron) and network.get(
+                'dns_domain'):
             try:
                 port_req_body = {'port': {'dns_name': instance.hostname}}
                 neutron.update_port(port_id, port_req_body)
@@ -1650,7 +1709,7 @@ class API:
                          'name') % {'hostname': instance.hostname})
                 raise exception.InvalidInput(reason=msg)
 
-    def _reset_port_dns_name(self, network, port_id, neutron_client):
+    def _reset_port_dns_name(self, network, port_id, client):
         """Reset an instance port dns_name attribute to empty when using
         external DNS service.
 
@@ -1660,10 +1719,11 @@ class API:
         request with a Neutron client using user's context, so that the DNS
         record can be found under user's zone and domain.
         """
-        if self._has_dns_extension() and network.get('dns_domain'):
+        if self.has_dns_extension(client=client) and network.get(
+                'dns_domain'):
             try:
                 port_req_body = {'port': {'dns_name': ''}}
-                neutron_client.update_port(port_id, port_req_body)
+                client.update_port(port_id, port_req_body)
             except neutron_client_exc.NeutronClientException:
                 LOG.exception("Failed to reset dns_name for port %s", port_id)
 
@@ -2037,7 +2097,7 @@ class API:
             segments, the first segment that defines a physnet value will be
             used for the physnet name.
         """
-        if self._has_multi_provider_extension(context, neutron=neutron):
+        if self.has_multi_provider_extension(client=neutron):
             network = neutron.show_network(net_id,
                                            fields='segments').get('network')
             segments = network.get('segments', {})
@@ -2712,7 +2772,7 @@ class API:
         # ...and retrieve the port details for the same reason, but only if
         # they're not already there because the fip-port-details extension is
         # present
-        if not self._has_fip_port_details_extension(context, client):
+        if not self.has_fip_port_details_extension(client=client):
             port_id = fip['port_id']
             try:
                 fip['port_details'] = client.show_port(
@@ -2740,7 +2800,7 @@ class API:
         # ...and retrieve the port details for the same reason, but only if
         # they're not already there because the fip-port-details extension is
         # present
-        if not self._has_fip_port_details_extension(context, client):
+        if not self.has_fip_port_details_extension(client=client):
             port_id = fip['port_id']
             try:
                 fip['port_details'] = client.show_port(
@@ -2779,7 +2839,7 @@ class API:
         # ...and retrieve the port details for the same reason, but only if
         # they're not already there because the fip-port-details extension is
         # present
-        if not self._has_fip_port_details_extension(context, client):
+        if not self.has_fip_port_details_extension(client=client):
             ports = {port['id']: port for port in client.list_ports(
                 **{'tenant_id': project_id})['ports']}
             for fip in fips:
@@ -2975,7 +3035,7 @@ class API:
         :raises: nova.exception.PortBindingActivationFailed if any port binding
             activation fails
         """
-        if not self.supports_port_binding_extension(context):
+        if not self.has_port_binding_extension(context):
             # If neutron isn't new enough yet for the port "binding-extended"
             # API extension, we just no-op. The port binding host will be
             # be updated in migrate_instance_finish, which is functionally OK,
@@ -3501,7 +3561,8 @@ class API:
         :raises: PortBindingDeletionFailed if port binding deletion fails.
         """
         # First check to see if the port binding extension is supported.
-        if not self.supports_port_binding_extension(context):
+        client = get_client(context)
+        if not self.has_port_binding_extension(client=client):
             LOG.info("Neutron extension '%s' is not supported; not cleaning "
                      "up port bindings for host %s.",
                      constants.PORT_BINDING_EXTENDED, host, instance=instance)
@@ -3692,9 +3753,8 @@ class API:
         :param vif: The VIF in question.
         :param index: The index on the instance for the VIF.
         """
-        self._refresh_neutron_extensions_cache(context)
-        if constants.VNIC_INDEX_EXT in self.extensions:
-            neutron = get_client(context)
+        neutron = get_client(context)
+        if self.has_vnic_index_extension(client=neutron):
             port_req_body = {'port': {'vnic_index': index}}
             try:
                 neutron.update_port(vif['id'], port_req_body)
@@ -3717,10 +3777,11 @@ class API:
             either Segment extension isn't enabled in Neutron or if the network
             isn't configured for routing.
         """
-        if not self._has_segment_extension(context):
+        client = get_client(context)
+
+        if not self.has_segment_extension(client=client):
             return []
 
-        client = get_client(context)
         try:
             # NOTE(sbauza): We can't use list_segments() directly because the
             # API is borked and returns both segments but also segmentation IDs
@@ -3747,10 +3808,11 @@ class API:
             extension isn't enabled in Neutron or the provided subnet doesn't
             have segments (if the related network isn't configured for routing)
         """
-        if not self._has_segment_extension(context):
+        client = get_client(context)
+
+        if not self.has_segment_extension(client=client):
             return None
 
-        client = get_client(context)
         try:
             subnet = client.show_subnet(subnet_id)['subnet']
         except neutron_client_exc.NeutronClientException as e:
diff --git a/nova/tests/functional/regressions/test_bug_1888395.py b/nova/tests/functional/regressions/test_bug_1888395.py
index 36eb0e0f52b3..e582ad3e8519 100644
--- a/nova/tests/functional/regressions/test_bug_1888395.py
+++ b/nova/tests/functional/regressions/test_bug_1888395.py
@@ -108,7 +108,7 @@ class TestLiveMigrationWithoutMultiplePortBindings(
             networks=[{'port': self.neutron.port_1['id']}])
 
         self.assertFalse(
-            self.neutron_api.supports_port_binding_extension(self.ctxt))
+            self.neutron_api.has_port_binding_extension(self.ctxt))
         # TODO(sean-k-mooney): extend _live_migrate to support passing a host
         self.api.post_server_action(
             server['id'],
diff --git a/nova/tests/functional/test_servers_resource_request.py b/nova/tests/functional/test_servers_resource_request.py
index a8df84a5bcf0..1fb39ac98a8b 100644
--- a/nova/tests/functional/test_servers_resource_request.py
+++ b/nova/tests/functional/test_servers_resource_request.py
@@ -146,12 +146,13 @@ class ExtendedResourceRequestNeutronFixture(ResourceRequestNeutronFixture):
             # port_resource_request_groups.py
             {
                 "updated": "2021-08-02T10:00:00-00:00",
-                "name": constants.RESOURCE_REQUEST_GROUPS_EXTENSION,
+                "name": "Port Resource Request Groups",
                 "links": [],
                 "alias": "port-resource-request-groups",
-                "description":
+                "description": (
                     "Support requesting multiple groups of resources and "
                     "traits from the same RP subtree in resource_request"
+                ),
             }
         )
         return extensions
diff --git a/nova/tests/unit/compute/test_compute.py b/nova/tests/unit/compute/test_compute.py
index f65f1abdb740..1d877e0900ec 100644
--- a/nova/tests/unit/compute/test_compute.py
+++ b/nova/tests/unit/compute/test_compute.py
@@ -6066,10 +6066,9 @@ class ComputeTestCase(BaseTestCase,
             return fake_network.fake_get_instance_nw_info(self)
 
         self.stub_out('nova.network.neutron.API.get_instance_nw_info', stupid)
-        self.useFixture(
-            std_fixtures.MonkeyPatch(
-                'nova.network.neutron.API.supports_port_binding_extension',
-                lambda *args: True))
+        self.useFixture(std_fixtures.MonkeyPatch(
+            'nova.network.neutron.API.has_port_binding_extension',
+            lambda *args: True))
         # creating instance testdata
         instance = self._create_fake_instance_obj({'host': 'dummy'})
         c = context.get_admin_context()
diff --git a/nova/tests/unit/compute/test_compute_mgr.py b/nova/tests/unit/compute/test_compute_mgr.py
index 4d7967b37e48..836755b4e68d 100644
--- a/nova/tests/unit/compute/test_compute_mgr.py
+++ b/nova/tests/unit/compute/test_compute_mgr.py
@@ -3460,7 +3460,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_success(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: True))
         self._test_check_can_live_migrate_destination()
 
@@ -3468,7 +3468,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_fail(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: True))
         self.assertRaises(
             test.TestingException,
@@ -3479,7 +3479,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_contains_vifs(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: True))
         migrate_data = self._test_check_can_live_migrate_destination()
         self.assertIn('vifs', migrate_data)
@@ -3489,7 +3489,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_no_binding_extended(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: False))
         migrate_data = self._test_check_can_live_migrate_destination()
         self.assertNotIn('vifs', migrate_data)
@@ -3498,7 +3498,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_src_numa_lm_false(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: True))
         self._test_check_can_live_migrate_destination(src_numa_lm=False)
 
@@ -3506,7 +3506,7 @@ class ComputeManagerUnitTestCase(test.NoDBTestCase,
         side_effect=exception.InstanceGroupNotFound(group_uuid='')))
     def test_check_can_live_migrate_destination_src_numa_lm_true(self):
         self.useFixture(std_fixtures.MonkeyPatch(
-            'nova.network.neutron.API.supports_port_binding_extension',
+            'nova.network.neutron.API.has_port_binding_extension',
             lambda *args: True))
         self._test_check_can_live_migrate_destination(src_numa_lm=True)
 
diff --git a/nova/tests/unit/conductor/tasks/test_cross_cell_migrate.py b/nova/tests/unit/conductor/tasks/test_cross_cell_migrate.py
index 127d76347795..ec07e6f55fae 100644
--- a/nova/tests/unit/conductor/tasks/test_cross_cell_migrate.py
+++ b/nova/tests/unit/conductor/tasks/test_cross_cell_migrate.py
@@ -439,7 +439,7 @@ class CrossCellMigrationTaskTestCase(test.NoDBTestCase):
         what we need.
         """
         with mock.patch.object(
-                self.task.network_api, 'supports_port_binding_extension',
+                self.task.network_api, 'has_port_binding_extension',
                 return_value=True) as mock_neutron_check:
             self.task._perform_external_api_checks()
         mock_neutron_check.assert_called_once_with(self.task.context)
@@ -447,7 +447,7 @@ class CrossCellMigrationTaskTestCase(test.NoDBTestCase):
     def test_perform_external_api_checks_old_neutron(self):
         """Tests the case that neutron API is old."""
         with mock.patch.object(
-                self.task.network_api, 'supports_port_binding_extension',
+                self.task.network_api, 'has_port_binding_extension',
                 return_value=False):
             ex = self.assertRaises(exception.MigrationPreCheckError,
                                    self.task._perform_external_api_checks)
diff --git a/nova/tests/unit/conductor/tasks/test_live_migrate.py b/nova/tests/unit/conductor/tasks/test_live_migrate.py
index 88f00d0d84aa..cb40c076c82d 100644
--- a/nova/tests/unit/conductor/tasks/test_live_migrate.py
+++ b/nova/tests/unit/conductor/tasks/test_live_migrate.py
@@ -353,7 +353,7 @@ class LiveMigrationTaskTestCase(test.NoDBTestCase):
 
         with test.nested(
             mock.patch.object(self.task.network_api,
-                              'supports_port_binding_extension',
+                              'has_port_binding_extension',
                               return_value=False),
             mock.patch.object(self.task, '_check_can_migrate_pci')):
             self.assertIsNone(self.task._check_requested_destination())
@@ -387,7 +387,7 @@ class LiveMigrationTaskTestCase(test.NoDBTestCase):
 
         with test.nested(
             mock.patch.object(self.task.network_api,
-                              'supports_port_binding_extension',
+                              'has_port_binding_extension',
                               return_value=False),
             mock.patch.object(self.task, '_check_can_migrate_pci')):
             ex = self.assertRaises(exception.MigrationPreCheckError,
@@ -813,7 +813,7 @@ class LiveMigrationTaskTestCase(test.NoDBTestCase):
         """
 
         @mock.patch.object(self.task.network_api,
-                           'supports_port_binding_extension')
+                           'has_port_binding_extension')
         @mock.patch.object(live_migrate,
                            'supports_vif_related_pci_allocations')
         def _test(instance_pci_reqs,
diff --git a/nova/tests/unit/network/test_neutron.py b/nova/tests/unit/network/test_neutron.py
index a06549b609c6..433966ae1a27 100644
--- a/nova/tests/unit/network/test_neutron.py
+++ b/nova/tests/unit/network/test_neutron.py
@@ -515,7 +515,11 @@ class TestAPIBase(test.TestCase):
         has_dns_extension = False
         if kwargs.get('dns_extension'):
             has_dns_extension = True
-            self.api.extensions[constants.DNS_INTEGRATION] = 1
+            self.api.extensions = {
+                constants.DNS_INTEGRATION: {
+                    'alias': constants.DNS_INTEGRATION,
+                },
+            }
 
         # Net idx is 1-based for compatibility with existing unit tests
         nets = self.nets[net_idx - 1]
@@ -1167,17 +1171,14 @@ class TestAPI(TestAPIBase):
         mock_get_physnet.assert_called_once_with(
             mock.ANY, mock.ANY, self.port_data1[0]['network_id'])
 
-    @mock.patch.object(neutronapi, 'get_client')
-    def test_refresh_neutron_extensions_cache(self, mock_get_client):
+    def test_refresh_neutron_extensions_cache(self):
         mocked_client = mock.create_autospec(client.Client)
-        mock_get_client.return_value = mocked_client
         mocked_client.list_extensions.return_value = {
-            'extensions': [{'name': constants.QOS_QUEUE}]}
-        self.api._refresh_neutron_extensions_cache(self.context)
+            'extensions': [{'alias': constants.QOS_QUEUE}]}
+        self.api._refresh_neutron_extensions_cache(mocked_client)
         self.assertEqual(
-            {constants.QOS_QUEUE: {'name': constants.QOS_QUEUE}},
+            {constants.QOS_QUEUE: {'alias': constants.QOS_QUEUE}},
             self.api.extensions)
-        mock_get_client.assert_called_once_with(self.context)
         mocked_client.list_extensions.assert_called_once_with()
 
     @mock.patch.object(neutronapi, 'get_client')
@@ -1186,7 +1187,7 @@ class TestAPI(TestAPIBase):
         mocked_client = mock.create_autospec(client.Client)
         mock_get_client.return_value = mocked_client
         mocked_client.list_extensions.return_value = {
-            'extensions': [{'name': constants.QOS_QUEUE}]}
+            'extensions': [{'alias': constants.QOS_QUEUE}]}
         flavor = objects.Flavor.get_by_name(self.context, 'm1.small')
         flavor['rxtx_factor'] = 1
         instance = objects.Instance(system_metadata={})
@@ -2415,9 +2416,13 @@ class TestAPI(TestAPIBase):
             mock_nc.show_port.side_effect = exceptions.PortNotFoundClient
 
         if fip_ext_enabled:
-            self.api.extensions = [constants.FIP_PORT_DETAILS]
+            self.api.extensions = {
+                constants.FIP_PORT_DETAILS: {
+                    'alias': constants.FIP_PORT_DETAILS,
+                },
+            }
         else:
-            self.api.extensions = []
+            self.api.extensions = {}
 
         fip = self.api.get_floating_ip(self.context, uuids.fip_id)
 
@@ -2490,9 +2495,13 @@ class TestAPI(TestAPIBase):
             mock_nc.show_port.side_effect = exceptions.PortNotFoundClient
 
         if fip_ext_enabled:
-            self.api.extensions = [constants.FIP_PORT_DETAILS]
+            self.api.extensions = {
+                constants.FIP_PORT_DETAILS: {
+                    'alias': constants.FIP_PORT_DETAILS,
+                },
+            }
         else:
-            self.api.extensions = []
+            self.api.extensions = {}
 
         fip = self.api.get_floating_ip_by_address(self.context, '172.1.2.3')
 
@@ -3474,7 +3483,7 @@ class TestAPI(TestAPIBase):
                                       'provider:network_type': 'vxlan'}]}}
         test_ext_list = {'extensions':
                             [{'name': 'Multi Provider Network',
-                             'alias': 'multi-segments'}]}
+                             'alias': 'multi-provider'}]}
 
         mock_client = mock_get_client.return_value
         mock_client.list_extensions.return_value = test_ext_list
@@ -3495,7 +3504,7 @@ class TestAPI(TestAPIBase):
                                 'provider:network_type': 'vlan'}}
         test_ext_list = {'extensions':
                             [{'name': 'Multi Provider Network',
-                             'alias': 'multi-segments'}]}
+                             'alias': 'multi-provider'}]}
 
         mock_client = mock_get_client.return_value
         mock_client.list_extensions.return_value = test_ext_list
@@ -3521,7 +3530,7 @@ class TestAPI(TestAPIBase):
                                       'provider:network_type': 'vlan'}]}}
         test_ext_list = {'extensions':
                             [{'name': 'Multi Provider Network',
-                             'alias': 'multi-segments'}]}
+                             'alias': 'multi-provider'}]}
 
         mock_client = mock_get_client.return_value
         mock_client.list_extensions.return_value = test_ext_list
@@ -4357,7 +4366,7 @@ class TestAPI(TestAPIBase):
     def test_update_instance_vnic_index(self, mock_get_client,
                                         mock_refresh_extensions):
         api = neutronapi.API()
-        api.extensions = set([constants.VNIC_INDEX_EXT])
+        api.extensions = set([constants.VNIC_INDEX])
         mock_client = mock_get_client.return_value
         mock_client.update_port.return_value = 'port'
 
@@ -4382,7 +4391,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock
     ):
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
 
         # We pass in a port profile which has a migration attribute and also
         # a second port profile attribute 'fake_profile' this can be
@@ -4426,7 +4435,7 @@ class TestAPI(TestAPIBase):
         value is None.
         """
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
 
         fake_ports = {'ports': [
                         {'id': uuids.portid,
@@ -4602,7 +4611,7 @@ class TestAPI(TestAPIBase):
     def test_update_port_bindings_for_instance_with_pci_no_migration(self,
                                             get_client_mock,
                                             get_pci_device_devspec_mock):
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
 
         devspec = mock.Mock()
         devspec.get_tags.return_value = {'physical_network': 'physnet1'}
@@ -4652,7 +4661,7 @@ class TestAPI(TestAPIBase):
     def test_update_port_bindings_for_instance_with_same_host_failed_vif_type(
         self, get_client_mock):
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         list_ports_mock = mock.Mock()
         update_port_mock = mock.Mock()
 
@@ -4697,7 +4706,7 @@ class TestAPI(TestAPIBase):
     def test_update_port_bindings_for_instance_with_diff_host_unbound_vif_type(
         self, get_client_mock):
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
 
         binding_profile = {'fake_profile': 'fake_data',
                            constants.MIGRATING_ATTR: 'my-dest-host'}
@@ -4987,7 +4996,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock):
 
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         # We test with an instance host and destination_host where the
         # port will be moving.
         get_ports = {'ports': [
@@ -5017,7 +5026,7 @@ class TestAPI(TestAPIBase):
         destination host and the binding:profile is None in the port.
         """
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         # We test with an instance host and destination_host where the
         # port will be moving but with binding:profile set to None.
         get_ports = {
@@ -5048,7 +5057,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock):
 
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         port_id = uuids.port_id
         get_ports = {'ports': [
                         {'id': port_id,
@@ -5068,7 +5077,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock):
 
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         get_ports = {'ports': [
                         {'id': uuids.port_id,
                          constants.BINDING_HOST_ID: instance.host}]}
@@ -5104,7 +5113,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock):
 
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         migrate_profile = {
             constants.MIGRATING_ATTR: 'new-host'}
         # Pass a port with an migration porfile attribute.
@@ -5116,8 +5125,9 @@ class TestAPI(TestAPIBase):
         self.api.list_ports = mock.Mock(return_value=get_ports)
         mocked_client = get_client_mock.return_value
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             self.api.setup_networks_on_host(self.context,
                                             instance,
                                             host='new-host',
@@ -5135,7 +5145,7 @@ class TestAPI(TestAPIBase):
         which is raised through to the caller.
         """
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         migrate_profile = {
             constants.MIGRATING_ATTR: 'new-host'}
         # Pass a port with an migration porfile attribute.
@@ -5153,8 +5163,9 @@ class TestAPI(TestAPIBase):
         mocked_client = get_client_mock.return_value
         mocked_client.delete_port_binding.side_effect = NeutronError
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             ex = self.assertRaises(
                 exception.PortBindingDeletionFailed,
                 self.api.setup_networks_on_host,
@@ -5176,7 +5187,7 @@ class TestAPI(TestAPIBase):
         self, get_client_mock):
 
         instance = fake_instance.fake_instance_obj(self.context)
-        self.api._has_port_binding_extension = mock.Mock(return_value=True)
+        self.api.has_port_binding_extension = mock.Mock(return_value=True)
         # Pass a port without any migration porfile attribute.
         get_ports = {'ports': [
                         {'id': uuids.port_id,
@@ -5184,7 +5195,7 @@ class TestAPI(TestAPIBase):
         self.api.list_ports = mock.Mock(return_value=get_ports)
         update_port_mock = mock.Mock()
         get_client_mock.return_value.update_port = update_port_mock
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
+        with mock.patch.object(self.api, 'has_port_binding_extension',
                                return_value=False):
             self.api.setup_networks_on_host(self.context,
                                             instance,
@@ -5242,6 +5253,8 @@ class TestAPI(TestAPIBase):
     def test_unbind_ports_get_client(self, mock_neutron):
         self._test_unbind_ports_get_client(mock_neutron)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port')
     def _test_unbind_ports(self, mock_neutron, mock_show):
         mock_client = mock.Mock()
@@ -5284,7 +5297,11 @@ class TestAPI(TestAPIBase):
 
     @mock.patch(
         'nova.network.neutron.API.has_extended_resource_request_extension',
-        new=mock.Mock()
+        new=mock.Mock(return_value=True),
+    )
+    @mock.patch(
+        'nova.network.neutron.API.has_dns_extension',
+        new=mock.Mock(return_value=True),
     )
     @mock.patch('nova.network.neutron.API.get_instance_nw_info')
     @mock.patch('nova.network.neutron.excutils')
@@ -5827,9 +5844,13 @@ class TestAPI(TestAPIBase):
             mock_nc.list_ports.return_value = {'ports': []}
 
         if fip_ext_enabled:
-            self.api.extensions = [constants.FIP_PORT_DETAILS]
+            self.api.extensions = {
+                constants.FIP_PORT_DETAILS: {
+                    'alias': constants.FIP_PORT_DETAILS,
+                },
+            }
         else:
-            self.api.extensions = []
+            self.api.extensions = {}
 
         fips = self.api.get_floating_ips_by_project(self.context)
 
@@ -5862,6 +5883,8 @@ class TestAPI(TestAPIBase):
         """Make sure we don't fail for floating IPs without attached ports."""
         self._test_get_floating_ips_by_project(False, False)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=True))
     @mock.patch('nova.network.neutron.API._show_port')
     def test_unbind_ports_reset_dns_name_by_admin(self, mock_show):
         neutron = mock.Mock()
@@ -5872,7 +5895,6 @@ class TestAPI(TestAPIBase):
             }
         }
         port_client = mock.Mock()
-        self.api.extensions = [constants.DNS_INTEGRATION]
         ports = [uuids.port_id]
         mock_show.return_value = {'id': uuids.port}
         self.api._unbind_ports(self.context, ports, neutron, port_client)
@@ -5885,6 +5907,8 @@ class TestAPI(TestAPIBase):
             uuids.port_id, port_req_body)
         neutron.update_port.assert_not_called()
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=True))
     @mock.patch('nova.network.neutron.API._show_port')
     def test_unbind_ports_reset_dns_name_by_non_admin(self, mock_show):
         neutron = mock.Mock()
@@ -5895,7 +5919,6 @@ class TestAPI(TestAPIBase):
             }
         }
         port_client = mock.Mock()
-        self.api.extensions = [constants.DNS_INTEGRATION]
         ports = [uuids.port_id]
         mock_show.return_value = {'id': uuids.port}
         self.api._unbind_ports(self.context, ports, neutron, port_client)
@@ -5909,6 +5932,8 @@ class TestAPI(TestAPIBase):
         neutron.update_port.assert_called_once_with(
             uuids.port_id, non_admin_port_req_body)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port')
     def test_unbind_ports_reset_allocation_in_port_binding(self, mock_show):
         neutron = mock.Mock()
@@ -5924,6 +5949,8 @@ class TestAPI(TestAPIBase):
         port_client.update_port.assert_called_once_with(
             uuids.port_id, port_req_body)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port')
     def test_unbind_ports_reset_binding_profile(self, mock_show):
         neutron = mock.Mock()
@@ -5947,6 +5974,8 @@ class TestAPI(TestAPIBase):
         port_client.update_port.assert_called_once_with(
             uuids.port_id, port_req_body)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._populate_neutron_extension_values')
     @mock.patch('nova.network.neutron.API._update_port',
                 # called twice, fails on the 2nd call and triggers the cleanup
@@ -6028,6 +6057,8 @@ class TestAPI(TestAPIBase):
             neutron_client=mock.ANY)
         mock_log.assert_not_called()
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port',
                 side_effect=Exception)
     @mock.patch.object(neutronapi.LOG, 'exception')
@@ -6045,6 +6076,8 @@ class TestAPI(TestAPIBase):
                 'binding:profile': {}, 'binding:host_id': None}})
         self.assertTrue(mock_log.called)
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port')
     @mock.patch.object(neutronapi.LOG, 'exception')
     def test_unbind_ports_portnotfound(self, mock_log, mock_show):
@@ -6061,6 +6094,8 @@ class TestAPI(TestAPIBase):
                 'binding:profile': {}, 'binding:host_id': None}})
         mock_log.assert_not_called()
 
+    @mock.patch('nova.network.neutron.API.has_dns_extension',
+                new=mock.Mock(return_value=False))
     @mock.patch('nova.network.neutron.API._show_port')
     @mock.patch.object(neutronapi.LOG, 'exception')
     def test_unbind_ports_unexpected_error(self, mock_log, mock_show):
@@ -6676,7 +6711,7 @@ class TestAPI(TestAPIBase):
         """Tests that migrate_instance_start exits early if neutron doesn't
         have the binding-extended API extension.
         """
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
+        with mock.patch.object(self.api, 'has_port_binding_extension',
                                return_value=False):
             self.api.migrate_instance_start(
                 self.context, mock.sentinel.instance, {})
@@ -6696,8 +6731,9 @@ class TestAPI(TestAPIBase):
         migration = objects.Migration(
             source_compute='source', dest_compute='dest')
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             self.api.migrate_instance_start(
                 self.context, instance, migration)
 
@@ -6721,8 +6757,9 @@ class TestAPI(TestAPIBase):
         migration = objects.Migration(
             source_compute='source', dest_compute='dest')
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             self.api.migrate_instance_start(
                 self.context, instance, migration)
 
@@ -6748,8 +6785,9 @@ class TestAPI(TestAPIBase):
         migration = objects.Migration(
             source_compute='source', dest_compute='dest')
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             self.api.migrate_instance_start(
                 self.context, instance, migration)
 
@@ -6772,8 +6810,9 @@ class TestAPI(TestAPIBase):
         migration = objects.Migration(
             source_compute='source', dest_compute='dest')
 
-        with mock.patch.object(self.api, 'supports_port_binding_extension',
-                               return_value=True):
+        with mock.patch.object(
+            self.api, 'has_port_binding_extension', return_value=True,
+        ):
             self.api.migrate_instance_start(
                 self.context, instance, migration)
 
@@ -6952,7 +6991,7 @@ class TestAPI(TestAPIBase):
 
     def test_get_segment_ids_for_network_no_segment_ext(self):
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=False
+            self.api, 'has_segment_extension', return_value=False,
         ):
             self.assertEqual(
                 [], self.api.get_segment_ids_for_network(self.context,
@@ -6965,7 +7004,7 @@ class TestAPI(TestAPIBase):
         mock_client.return_value = mocked_client
         mocked_client.list_subnets.return_value = subnets
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             res = self.api.get_segment_ids_for_network(
                 self.context, uuids.network_id)
@@ -6980,7 +7019,7 @@ class TestAPI(TestAPIBase):
         mock_client.return_value = mocked_client
         mocked_client.list_subnets.return_value = subnets
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             res = self.api.get_segment_ids_for_network(
                 self.context, uuids.network_id)
@@ -6995,7 +7034,7 @@ class TestAPI(TestAPIBase):
         mocked_client.list_subnets.side_effect = (
             exceptions.NeutronClientException(status_code=404))
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             self.assertRaises(exception.InvalidRoutedNetworkConfiguration,
                               self.api.get_segment_ids_for_network,
@@ -7003,7 +7042,7 @@ class TestAPI(TestAPIBase):
 
     def test_get_segment_id_for_subnet_no_segment_ext(self):
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=False
+            self.api, 'has_segment_extension', return_value=False,
         ):
             self.assertIsNone(
                 self.api.get_segment_id_for_subnet(self.context,
@@ -7016,7 +7055,7 @@ class TestAPI(TestAPIBase):
         mock_client.return_value = mocked_client
         mocked_client.show_subnet.return_value = subnet
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             res = self.api.get_segment_id_for_subnet(
                 self.context, uuids.subnet_id)
@@ -7030,7 +7069,7 @@ class TestAPI(TestAPIBase):
         mock_client.return_value = mocked_client
         mocked_client.show_subnet.return_value = subnet
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             self.assertIsNone(
                 self.api.get_segment_id_for_subnet(self.context,
@@ -7043,7 +7082,7 @@ class TestAPI(TestAPIBase):
         mocked_client.show_subnet.side_effect = (
             exceptions.NeutronClientException(status_code=404))
         with mock.patch.object(
-            self.api, '_has_segment_extension', return_value=True
+            self.api, 'has_segment_extension', return_value=True,
         ):
             self.assertRaises(exception.InvalidRoutedNetworkConfiguration,
                               self.api.get_segment_id_for_subnet,
@@ -7251,9 +7290,9 @@ class TestInstanceHasExtendedResourceRequest(TestAPIBase):
         self.addCleanup(patcher.stop)
         self.mock_client = patcher.start().return_value
         self.extension = {
-            "extensions": [
+            'extensions': [
                 {
-                    "name": constants.RESOURCE_REQUEST_GROUPS_EXTENSION,
+                    'alias': constants.RESOURCE_REQUEST_GROUPS,
                 }
             ]
         }
@@ -7901,6 +7940,9 @@ class TestAPIPortbinding(TestAPIBase):
                 self.api.delete_port_binding(self.context, port_id,
                                              'fake-host')
 
+    @mock.patch(
+        'nova.network.neutron.API.has_dns_extension',
+        new=mock.Mock(return_value=False))
     @mock.patch('nova.accelerator.cyborg._CyborgClient.delete_arqs_by_uuid')
     @mock.patch('nova.network.neutron.get_binding_profile')
     @mock.patch('nova.network.neutron.API._show_port')
@@ -8290,7 +8332,7 @@ class TestAllocateForInstance(test.NoDBTestCase):
         requested_ports_dict = {uuids.port1: {}, uuids.port2: {}}
 
         mock_neutron.list_extensions.return_value = {"extensions": [
-            {"name": "asdf"}]}
+            {"alias": "asdf"}]}
         port1 = {"port": {"id": uuids.port1, "mac_address": "mac1r"}}
         port2 = {"port": {"id": uuids.port2, "mac_address": "mac2r"}}
         mock_admin.update_port.side_effect = [port1, port2]
@@ -8372,6 +8414,10 @@ class TestAPINeutronHostnameDNSPortbinding(TestAPIBase):
             bind_host_id=self.instance.get('host'),
             requested_networks=requested_networks)
 
+    @mock.patch(
+        'nova.network.neutron.API.has_dns_extension',
+        new=mock.Mock(return_value=True),
+    )
     @mock.patch(
         'nova.network.neutron.API.has_extended_resource_request_extension',
         new=mock.Mock(return_value=False)
@@ -8385,8 +8431,8 @@ class TestAPINeutronHostnameDNSPortbinding(TestAPIBase):
             11, dns_extension=True, bind_host_id=self.instance.get('host'))
 
     @mock.patch(
-        "nova.network.neutron.API._has_dns_extension",
-        new=mock.Mock(return_value=True)
+        'nova.network.neutron.API.has_dns_extension',
+        new=mock.Mock(return_value=True),
     )
     def test_allocate_for_instance_with_requested_port_with_dns_domain(self):
         # The port's dns_name attribute should be set by the port update
diff --git a/nova/tests/unit/virt/libvirt/test_driver.py b/nova/tests/unit/virt/libvirt/test_driver.py
index 50cb5536ef92..d1e362fef51d 100644
--- a/nova/tests/unit/virt/libvirt/test_driver.py
+++ b/nova/tests/unit/virt/libvirt/test_driver.py
@@ -10606,7 +10606,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
             self.assertEqual(drvr._uri(), testuri)
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
         '_create_shared_storage_test_file')
@@ -10645,7 +10645,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          return_value.obj_to_primitive()['nova_object.data'])
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
         '_create_shared_storage_test_file')
@@ -10685,7 +10685,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          return_value.obj_to_primitive()['nova_object.data'])
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
         '_create_shared_storage_test_file')
@@ -10722,7 +10722,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          return_value.obj_to_primitive()['nova_object.data'])
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
                        '_create_shared_storage_test_file',
@@ -10754,7 +10754,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          str(result.serial_listen_addr))
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
                        '_create_shared_storage_test_file',
@@ -10775,7 +10775,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         self.assertIsNone(result.serial_listen_addr)
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
                        '_create_shared_storage_test_file',
@@ -10808,7 +10808,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          result.obj_to_primitive()['nova_object.data'])
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
                        '_create_shared_storage_test_file',
@@ -10827,7 +10827,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         self.assertTrue(result.dst_supports_numa_live_migration)
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
                        '_create_shared_storage_test_file',
@@ -10844,7 +10844,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
         self.assertNotIn('dst_supports_numa_live_migration', result)
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
         '_create_shared_storage_test_file')
@@ -10885,7 +10885,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                          return_value.obj_to_primitive()['nova_object.data'])
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=False))
     @mock.patch.object(libvirt_driver.LibvirtDriver,
         '_create_shared_storage_test_file')
@@ -10930,7 +10930,7 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                           compute_info, compute_info, False)
 
     @mock.patch(
-        'nova.network.neutron.API.supports_port_binding_extension',
+        'nova.network.neutron.API.has_port_binding_extension',
         new=mock.Mock(return_value=True))
     @mock.patch.object(
         libvirt_driver.LibvirtDriver,
diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
index c8fd7e22ed38..97b9f87aabbe 100644
--- a/nova/virt/libvirt/driver.py
+++ b/nova/virt/libvirt/driver.py
@@ -9161,7 +9161,7 @@ class LibvirtDriver(driver.ComputeDriver):
         # populate it if we are using multiple port bindings.
         # TODO(stephenfin): Remove once we can do this unconditionally in X or
         # later
-        if self._network_api.supports_port_binding_extension(context):
+        if self._network_api.has_port_binding_extension(context):
             data.vifs = (
                 migrate_data_obj.VIFMigrateData.create_skeleton_migrate_vifs(
                     instance.get_network_info()))