diff --git a/neutron_lib/api/validators.py b/neutron_lib/api/validators.py
index 722c005..b40ef50 100644
--- a/neutron_lib/api/validators.py
+++ b/neutron_lib/api/validators.py
@@ -488,6 +488,54 @@ def validate_non_negative(data, valid_values=None):
         return msg
 
 
+def validate_subports(data, valid_values=None):
+    if not isinstance(data, list):
+        msg = _("Invalid data format for subports: '%s'") % data
+        LOG.debug(msg)
+        return msg
+
+    subport_ids = set()
+    segmentation_ids = set()
+    for subport in data:
+        if not isinstance(subport, dict):
+            msg = _("Invalid data format for subport: '%s'") % subport
+            LOG.debug(msg)
+            return msg
+
+        # Expect a non duplicated and valid port_id for the subport
+        if 'port_id' not in subport:
+            msg = _("A valid port UUID must be specified")
+            LOG.debug(msg)
+            return msg
+        elif validate_uuid(subport["port_id"]):
+            msg = _("Invalid UUID for subport: '%s'") % subport["port_id"]
+            return msg
+        elif subport["port_id"] in subport_ids:
+            msg = _("Non unique UUID for subport: '%s'") % subport["port_id"]
+            return msg
+        subport_ids.add(subport["port_id"])
+
+        # Validate that both segmentation id and segmentation type are
+        # specified, and that the client does not duplicate segmentation
+        # ids
+        segmentation_id = subport.get("segmentation_id")
+        segmentation_type = subport.get("segmentation_type")
+        if (not segmentation_id or not segmentation_type) and len(subport) > 1:
+            msg = _("Invalid subport details '%s': missing segmentation "
+                    "information. Must specify both segmentation_id and "
+                    "segmentation_type") % subport
+            LOG.debug(msg)
+            return msg
+        if segmentation_id in segmentation_ids:
+            msg = _("Segmentation ID '%(seg_id)s' for '%(subport)s' is not "
+                    "unique") % {"seg_id": segmentation_id,
+                    "subport": subport["port_id"]}
+            LOG.debug(msg)
+            return msg
+        if segmentation_id:
+            segmentation_ids.add(segmentation_id)
+
+
 # Dictionary that maintains a list of validation functions
 validators = {'type:dict': validate_dict,
               'type:dict_or_none': validate_dict_or_none,
@@ -515,6 +563,7 @@ validators = {'type:dict': validate_dict,
               'type:subnet_or_none': validate_subnet_or_none,
               'type:subnetpool_id': validate_subnetpool_id,
               'type:subnetpool_id_or_none': validate_subnetpool_id_or_none,
+              'type:subports': validate_subports,
               'type:uuid': validate_uuid,
               'type:uuid_or_none': validate_uuid_or_none,
               'type:uuid_list': validate_uuid_list,
diff --git a/neutron_lib/tests/unit/api/test_validators.py b/neutron_lib/tests/unit/api/test_validators.py
index fececbf..70ba5b5 100644
--- a/neutron_lib/tests/unit/api/test_validators.py
+++ b/neutron_lib/tests/unit/api/test_validators.py
@@ -838,3 +838,66 @@ class TestAttributeValidation(base.BaseTestCase):
         for value in (0, 1, '2', True, False):
             msg = validators.validate_non_negative(value)
             self.assertIsNone(msg)
+
+    def test_validate_subports_invalid_body(self):
+        self.assertIsNotNone(validators.validate_subports(None))
+
+    def test_validate_subports_invalid_subport_object(self):
+        self.assertIsNotNone(validators.validate_subports(['foo_port']))
+
+    def test_validate_subports_invalid_port_uuid(self):
+        body = [{'port_id': 'foo_port'}]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_invalid_missing_port_id(self):
+        body = [{'poort_id': 'foo_port'}]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_invalid_duplicate_port_ids(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000'},
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000'}
+        ]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_invalid_incomplete_segmentation_details(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '3'}
+        ]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_invalid_unknown_paramenter(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '3', 'segmeNAtion_type': 'vlan'}
+        ]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_invalid_duplicate_segmentation_id(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '3', 'segmentation_type': 'vlan'},
+            {'port_id': '11111111-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '3', 'segmentation_type': 'vlan'}
+        ]
+        self.assertIsNotNone(validators.validate_subports(body))
+
+    def test_validate_subports_valid_empty_body(self):
+        self.assertIsNone(validators.validate_subports([]))
+
+    def test_validate_subports_valid_suports_with_segmentation_details(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '3', 'segmentation_type': 'vlan'},
+            {'port_id': '11111111-ffff-ffff-ffff-000000000000',
+             'segmentation_id': '5', 'segmentation_type': 'vlan'}
+        ]
+        self.assertIsNone(validators.validate_subports(body))
+
+    def test_validate_subports_valid_subports(self):
+        body = [
+            {'port_id': '00000000-ffff-ffff-ffff-000000000000'},
+            {'port_id': '11111111-ffff-ffff-ffff-000000000000'},
+        ]
+        self.assertIsNone(validators.validate_subports(body))