diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index 748ca64a7154..efbf6971fbae 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -1174,11 +1174,14 @@ block_device_mapping_v2:
             "delete_on_termination": true,
             "tag": "disk1" }]
 
-    Starting in microversion 2.32, the tag is an optional, arbitrary attribute
-    that can be used to assign a tag to the block device. This tag is then
-    exposed to the guest in the metadata API and the config drive and is
-    associated to hardware metadata for that block device, such as bus (ex:
-    SCSI), bus address (ex: 1:0:2:0), and serial.
+    In microversion 2.32, ``tag`` is an optional string attribute that can
+    be used to assign a tag to the block device. This tag is then exposed to
+    the guest in the metadata API and the config drive and is associated to
+    hardware metadata for that block device, such as bus (ex: SCSI), bus
+    address (ex: 1:0:2:0), and serial.
+
+    A bug has caused the ``tag`` attribute to no longer be accepted starting
+    with version 2.33. It has been restored in version 2.42.
   in: body
   required: false
   type: object
@@ -1501,9 +1504,28 @@ device_resp:
   in: body
   required: true
   type: string
-device_tag:
+device_tag_bdm:
   description: |
-    An arbitrary tag.
+    A device role tag that can be applied to a block device. The guest OS of a
+    server that has devices tagged in this manner can access hardware metadata
+    about the tagged devices from the metadata API and on the config drive, if
+    enabled.
+
+    .. note:: Due to a bug, block device tags are accepted in version 2.32 and
+      subsequently starting with version 2.42.
+  in: body
+  required: false
+  type: string
+  min_version: 2.32
+device_tag_nic:
+  description: |
+    A device role tag that can be applied to a network interface. The guest OS
+    of a server that has devices tagged in this manner can access hardware
+    metadata about the tagged devices from the metadata API and on the config
+    drive, if enabled.
+
+    .. note:: Due to a bug, network interface tags are accepted between 2.32
+      and 2.36 inclusively, and subsequently starting with version 2.42.
   in: body
   required: false
   type: string
@@ -3168,12 +3190,16 @@ networks:
     object.  To provision the server instance with a NIC for an already existing port,
     specify the port-id in the ``port`` attribute in a ``networks`` object.
 
-    Starting in microversion 2.32, it's possible to optionally assign an
-    arbitrary tag to a virtual network interface, specify the tag attribute in
-    the ``network`` object. An interface's tag is exposed to the guest in the
-    metadata API and the config drive and is associated to hardware metadata
-    for that network interface, such as bus (ex: PCI), bus address (ex:
-    0000:00:02.0), and MAC address.
+    In microversion 2.32, the ``tag`` is an optional string attribute that
+    can be used to assign a tag to a virtual network interface. This tag is
+    then exposed to the guest in the metadata API and the config drive and is
+    associated to hardware metadata for that network interface, such as bus
+    (ex: PCI), bus address (ex: 0000:00:02.0), and MAC address.
+
+    A bug has caused the ``tag`` attribute to no longer be accepted starting
+    with version 2.37. Therefore, network interfaces could only be tagged in
+    versions 2.32 to 2.36 inclusively. Version 2.42 has restored the ``tag``
+    attribute.
 
     Starting with microversion 2.37, this field is required and the special
     values *auto* and *none* can be specified for networks. *auto* tells the
diff --git a/api-ref/source/servers.inc b/api-ref/source/servers.inc
index 2aea292283f3..c80dcdb7e621 100644
--- a/api-ref/source/servers.inc
+++ b/api-ref/source/servers.inc
@@ -293,7 +293,7 @@ Request
   - networks.uuid: network_uuid
   - networks.port: port
   - networks.fixed_ip: fixed_ip
-  - networks.tag: device_tag
+  - networks.tag: device_tag_nic
   - personality: personality
   - block_device_mapping_v2: block_device_mapping_v2
   - block_device_mapping_v2.device_name: device_name
@@ -303,7 +303,7 @@ Request
   - block_device_mapping_v2.guest_format: guest_format
   - block_device_mapping_v2.boot_index: boot_index
   - block_device_mapping_v2.uuid: block_device_uuid
-  - block_device_mapping_v2.tag: device_tag
+  - block_device_mapping_v2.tag: device_tag_bdm
   - config_drive: config_drive
   - key_name: key_name
   - os:scheduler_hints: os:scheduler_hints
diff --git a/doc/api_samples/servers/v2.42/server-create-req.json b/doc/api_samples/servers/v2.42/server-create-req.json
new file mode 100644
index 000000000000..4b000b235c06
--- /dev/null
+++ b/doc/api_samples/servers/v2.42/server-create-req.json
@@ -0,0 +1,18 @@
+{
+    "server" : {
+        "name" : "device-tagging-server",
+        "flavorRef" : "http://openstack.example.com/flavors/1",
+        "networks" : [{
+            "uuid" : "ff608d40-75e9-48cb-b745-77bb55b5eaf2",
+            "tag": "nic1"
+        }],
+        "block_device_mapping_v2": [{
+            "uuid": "70a599e0-31e7-49b7-b260-868f441e862b",
+            "source_type": "image",
+            "destination_type": "volume",
+            "boot_index": 0,
+            "volume_size": "1",
+            "tag": "disk1"
+        }]
+    }
+}
\ No newline at end of file
diff --git a/doc/api_samples/servers/v2.42/server-create-resp.json b/doc/api_samples/servers/v2.42/server-create-resp.json
new file mode 100644
index 000000000000..dd0bb9f2284e
--- /dev/null
+++ b/doc/api_samples/servers/v2.42/server-create-resp.json
@@ -0,0 +1,22 @@
+{
+    "server": {
+        "OS-DCF:diskConfig": "AUTO",
+        "adminPass": "S5wqy9sPYUvU",
+        "id": "97108291-2fd7-4dc2-a909-eaae0306a6a9",
+        "links": [
+            {
+                "href": "http://openstack.example.com/v2.1/6f70656e737461636b20342065766572/servers/97108291-2fd7-4dc2-a909-eaae0306a6a9",
+                "rel": "self"
+            },
+            {
+                "href": "http://openstack.example.com/6f70656e737461636b20342065766572/servers/97108291-2fd7-4dc2-a909-eaae0306a6a9",
+                "rel": "bookmark"
+            }
+        ],
+        "security_groups": [
+            {
+                "name": "default"
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/doc/api_samples/versions/v21-version-get-resp.json b/doc/api_samples/versions/v21-version-get-resp.json
index 8f9bfd8aa5a7..64120de26c91 100644
--- a/doc/api_samples/versions/v21-version-get-resp.json
+++ b/doc/api_samples/versions/v21-version-get-resp.json
@@ -19,7 +19,7 @@
             }
         ],
         "status": "CURRENT",
-        "version": "2.41",
+        "version": "2.42",
         "min_version": "2.1",
         "updated": "2013-07-23T11:33:21Z"
     }
diff --git a/doc/api_samples/versions/versions-get-resp.json b/doc/api_samples/versions/versions-get-resp.json
index e424cf7a9d29..27ad9b370360 100644
--- a/doc/api_samples/versions/versions-get-resp.json
+++ b/doc/api_samples/versions/versions-get-resp.json
@@ -22,7 +22,7 @@
                 }
             ],
             "status": "CURRENT",
-            "version": "2.41",
+            "version": "2.42",
             "min_version": "2.1",
             "updated": "2013-07-23T11:33:21Z"
         }
diff --git a/nova/api/openstack/api_version_request.py b/nova/api/openstack/api_version_request.py
index 3b3b6bccc2b2..dde18537e449 100644
--- a/nova/api/openstack/api_version_request.py
+++ b/nova/api/openstack/api_version_request.py
@@ -98,6 +98,10 @@ REST_API_VERSION_HISTORY = """REST API Version History:
     * 2.39 - Deprecates image-metadata proxy API
     * 2.40 - Adds simple tenant usage pagination support.
     * 2.41 - Return uuid attribute for aggregates.
+    * 2.42 - In the context of device tagging at instance boot time,
+             re-introduce the tag attribute that, due to bugs, was lost
+             starting with version 2.33 for block devices and starting with
+             version 2.37 for network interfaces.
 """
 
 # The minimum and maximum versions of the API supported
@@ -106,7 +110,7 @@ REST_API_VERSION_HISTORY = """REST API Version History:
 # Note(cyeoh): This only applies for the v2.1 API once microversions
 # support is fully merged. It does not affect the V2 API.
 _MIN_API_VERSION = "2.1"
-_MAX_API_VERSION = "2.41"
+_MAX_API_VERSION = "2.42"
 DEFAULT_API_VERSION = _MIN_API_VERSION
 
 # Almost all proxy APIs which related to network, images and baremetal
diff --git a/nova/api/openstack/compute/block_device_mapping.py b/nova/api/openstack/compute/block_device_mapping.py
index 71fae8645cd9..a6f5f7d188df 100644
--- a/nova/api/openstack/compute/block_device_mapping.py
+++ b/nova/api/openstack/compute/block_device_mapping.py
@@ -17,6 +17,7 @@
 
 from webob import exc
 
+from nova.api.openstack import api_version_request
 from nova.api.openstack.compute.schemas import block_device_mapping as \
                                                   schema_block_device_mapping
 from nova.api.openstack import extensions
@@ -74,7 +75,16 @@ class BlockDeviceMapping(extensions.V21APIExtensionBase):
             create_kwargs['legacy_bdm'] = False
 
     def get_server_create_schema(self, version):
-        if version == '2.32':
-            return schema_block_device_mapping.server_create_v232
+        request_version = api_version_request.APIVersionRequest(version)
+        version_242 = api_version_request.APIVersionRequest('2.42')
+
+        # NOTE(artom) the following conditional was merged as
+        # "if version == '2.32'" The intent all along was to check whether
+        # version was greater than or equal to 2.32. In other words, we wanted
+        # to support tags in versions 2.32 and up, but ended up supporting them
+        # in version 2.32 only. Since we need a new microversion to add request
+        # body attributes, tags have been re-added in version 2.42.
+        if version == '2.32' or request_version >= version_242:
+            return schema_block_device_mapping.server_create_with_tags
         else:
             return schema_block_device_mapping.server_create
diff --git a/nova/api/openstack/compute/rest_api_version_history.rst b/nova/api/openstack/compute/rest_api_version_history.rst
index a3917d567859..c21466270817 100644
--- a/nova/api/openstack/compute/rest_api_version_history.rst
+++ b/nova/api/openstack/compute/rest_api_version_history.rst
@@ -336,6 +336,13 @@ user documentation.
   with 'nic1' will appear in the metadata along with its bus (PCI), bus address
   (ex: 0000:00:02.0), MAC address, and tag ('nic1').
 
+  .. note:: A bug has caused the tag attribute to no longer be accepted for
+    networks starting with version 2.37 and for block_device_mapping_v2
+    starting with version 2.33. In other words, networks could only be tagged
+    between versions 2.32 and 2.36 inclusively and block devices only in
+    version 2.32. As of version 2.42 the tag attribute has been restored and
+    both networks and block devices can be tagged again.
+
 2.33
 ----
 
@@ -344,6 +351,10 @@ user documentation.
 
     GET /v2.1/{tenant_id}/os-hypervisors?marker={hypervisor_id}&limit={limit}
 
+  In the context of device tagging at server create time, 2.33 also removes the
+  tag attribute from block_device_mapping_v2. This is a bug that is fixed in
+  2.42, in which the tag attribute is reintroduced.
+
 2.34
 ----
 
@@ -406,6 +417,10 @@ user documentation.
   Also, the ``uuid`` field in the ``networks`` object in the server create
   request is now strictly enforced to be in UUID format.
 
+  In the context of device tagging at server create time, 2.37 also removes the
+  tag attribute from networks. This is a bug that is fixed in 2.42, in which
+  the tag attribute is reintroduced.
+
 2.38 (Maximum in Newton)
 ------------------------
 
@@ -453,3 +468,12 @@ user documentation.
   `/os-aggregates` endpoint. This attribute is auto-generated upon creation of
   an aggregate. The `os-aggregates` API resource endpoint remains an
   administrator-only API.
+
+2.42
+----
+
+  In the context of device tagging at server create time, a bug has caused the
+  tag attribute to no longer be accepted for networks starting with version
+  2.37 and for block_device_mapping_v2 starting with version 2.33. Microversion
+  2.42 restores the tag parameter to both networks and block_device_mapping_v2,
+  allowing networks and block devices to be tagged again.
diff --git a/nova/api/openstack/compute/schemas/block_device_mapping.py b/nova/api/openstack/compute/schemas/block_device_mapping.py
index 8c68f8ac7526..e2183c915e72 100644
--- a/nova/api/openstack/compute/schemas/block_device_mapping.py
+++ b/nova/api/openstack/compute/schemas/block_device_mapping.py
@@ -69,17 +69,17 @@ server_create = {
     }
 }
 
-block_device_mapping_v232_new_item = {
+block_device_mapping_with_tags_new_item = {
     'tag': parameter_types.tag
 }
 
-block_device_mapping_v232 = copy.deepcopy(block_device_mapping)
-block_device_mapping_v232['properties'].update(
-    block_device_mapping_v232_new_item)
+block_device_mapping_with_tags = copy.deepcopy(block_device_mapping)
+block_device_mapping_with_tags['properties'].update(
+    block_device_mapping_with_tags_new_item)
 
-server_create_v232 = {
+server_create_with_tags = {
     'block_device_mapping_v2': {
         'type': 'array',
-        'items': block_device_mapping_v232
+        'items': block_device_mapping_with_tags
     }
 }
diff --git a/nova/api/openstack/compute/schemas/servers.py b/nova/api/openstack/compute/schemas/servers.py
index 91c5b093face..efe31b21a79a 100644
--- a/nova/api/openstack/compute/schemas/servers.py
+++ b/nova/api/openstack/compute/schemas/servers.py
@@ -105,6 +105,30 @@ base_create_v237['properties']['server']['properties']['networks'] = {
     ]}
 
 
+# 2.42 builds on 2.37 and re-introduces the tag field to the list of network
+# objects.
+base_create_v242 = copy.deepcopy(base_create_v237)
+base_create_v242['properties']['server']['properties']['networks'] = {
+    'oneOf': [
+        {'type': 'array',
+         'items': {
+             'type': 'object',
+             'properties': {
+                 'fixed_ip': parameter_types.ip_address,
+                 'port': {
+                     'oneOf': [{'type': 'string', 'format': 'uuid'},
+                               {'type': 'null'}]
+                 },
+                 'uuid': {'type': 'string', 'format': 'uuid'},
+                 'tag': parameter_types.tag,
+             },
+             'additionalProperties': False,
+         },
+        },
+        {'type': 'string', 'enum': ['none', 'auto']},
+    ]}
+
+
 base_update = {
     'type': 'object',
     'properties': {
diff --git a/nova/api/openstack/compute/servers.py b/nova/api/openstack/compute/servers.py
index c2f4b1db059a..a5fc979ca346 100644
--- a/nova/api/openstack/compute/servers.py
+++ b/nova/api/openstack/compute/servers.py
@@ -77,6 +77,7 @@ class ServersController(wsgi.Controller):
 
     schema_server_create_v232 = schema_servers.base_create_v232
     schema_server_create_v237 = schema_servers.base_create_v237
+    schema_server_create_v242 = schema_servers.base_create_v242
 
     @staticmethod
     def _add_location(robj):
@@ -169,6 +170,9 @@ class ServersController(wsgi.Controller):
                 invoke_kwds={"extension_info": self.extension_info},
                 propagate_map_exceptions=True)
         if list(self.create_schema_manager):
+            self.create_schema_manager.map(self._create_extension_schema,
+                                           self.schema_server_create_v242,
+                                           '2.42')
             self.create_schema_manager.map(self._create_extension_schema,
                                            self.schema_server_create_v237,
                                            '2.37')
@@ -517,7 +521,8 @@ class ServersController(wsgi.Controller):
     @validation.schema(schema_server_create, '2.1', '2.18')
     @validation.schema(schema_server_create_v219, '2.19', '2.31')
     @validation.schema(schema_server_create_v232, '2.32', '2.36')
-    @validation.schema(schema_server_create_v237, '2.37')
+    @validation.schema(schema_server_create_v237, '2.37', '2.41')
+    @validation.schema(schema_server_create_v242, '2.42')
     def create(self, req, body):
         """Creates a new server for a given user."""
 
diff --git a/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-req.json.tpl b/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-req.json.tpl
new file mode 100644
index 000000000000..87a6f49f04f5
--- /dev/null
+++ b/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-req.json.tpl
@@ -0,0 +1,18 @@
+{
+    "server" : {
+        "name" : "device-tagging-server",
+        "flavorRef" : "%(host)s/flavors/1",
+        "networks" : [{
+            "uuid" : "ff608d40-75e9-48cb-b745-77bb55b5eaf2",
+            "tag": "nic1"
+        }],
+        "block_device_mapping_v2": [{
+            "uuid": "%(image_id)s",
+            "source_type": "image",
+            "destination_type": "volume",
+            "boot_index": 0,
+            "volume_size": "1",
+            "tag": "disk1"
+        }]
+    }
+}
diff --git a/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-resp.json.tpl b/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-resp.json.tpl
new file mode 100644
index 000000000000..4b30e0cfbdb8
--- /dev/null
+++ b/nova/tests/functional/api_sample_tests/api_samples/servers/v2.42/server-create-resp.json.tpl
@@ -0,0 +1,22 @@
+{
+    "server": {
+        "OS-DCF:diskConfig": "AUTO",
+        "adminPass": "%(password)s",
+        "id": "%(id)s",
+        "links": [
+            {
+                "href": "%(versioned_compute_endpoint)s/servers/%(uuid)s",
+                "rel": "self"
+            },
+            {
+                "href": "%(compute_endpoint)s/servers/%(uuid)s",
+                "rel": "bookmark"
+            }
+        ],
+        "security_groups": [
+            {
+                "name": "default"
+            }
+        ]
+    }
+}
diff --git a/nova/tests/functional/api_sample_tests/test_servers.py b/nova/tests/functional/api_sample_tests/test_servers.py
index ade1f10f809c..f46a9833d7e9 100644
--- a/nova/tests/functional/api_sample_tests/test_servers.py
+++ b/nova/tests/functional/api_sample_tests/test_servers.py
@@ -193,6 +193,15 @@ class ServersSampleJson237Test(ServersSampleBase):
         self._post_server(use_common_server_api_samples=False)
 
 
+class ServersSampleJson242Test(ServersSampleBase):
+    microversion = '2.42'
+    sample_dir = 'servers'
+    scenarios = [('v2_42', {'api_major_version': 'v2.1'})]
+
+    def test_servers_post(self):
+        self._post_server(use_common_server_api_samples=False)
+
+
 class ServersUpdateSampleJsonTest(ServersSampleBase):
 
     def test_update_server(self):
diff --git a/releasenotes/notes/fix-virtual-device-role-tagging-7cfdb14f2ba4fbcf.yaml b/releasenotes/notes/fix-virtual-device-role-tagging-7cfdb14f2ba4fbcf.yaml
new file mode 100644
index 000000000000..7448664baee5
--- /dev/null
+++ b/releasenotes/notes/fix-virtual-device-role-tagging-7cfdb14f2ba4fbcf.yaml
@@ -0,0 +1,10 @@
+fixes:
+  - |
+    In the context of virtual device role tagging at server create time, the
+    2.42 microversion restores the tag attribute to networks and
+    block_device_mapping_v2. A bug has caused the tag attribute to no longer be
+    accepted starting with version 2.33 for block_device_mapping_v2 and
+    starting with version 2.37 for networks. In other words, block devices
+    could only be tagged in version 2.32 and network interfaces between
+    versions 2.32 and 2.36 inclusively. Starting with 2.42, both network
+    interfaces and block devices can be tagged again.