diff --git a/neutron/agent/ovn/metadata/agent.py b/neutron/agent/ovn/metadata/agent.py
index b59fbbd4cd8..0cd9ecb8681 100644
--- a/neutron/agent/ovn/metadata/agent.py
+++ b/neutron/agent/ovn/metadata/agent.py
@@ -227,8 +227,10 @@ class SbGlobalUpdateEvent(row_event.RowEvent):
     def run(self, event, row, old):
 
         def _update_chassis(self, row):
+            table = ('Chassis_Private' if self.agent.has_chassis_private
+                     else 'Chassis')
             self.agent.sb_idl.db_set(
-                'Chassis_Private', self.agent.chassis, ('external_ids', {
+                table, self.agent.chassis, ('external_ids', {
                     ovn_const.OVN_AGENT_METADATA_SB_CFG_KEY:
                         str(row.nb_cfg)})).execute()
 
@@ -291,17 +293,27 @@ class MetadataAgent(object):
         self._load_config()
 
         tables = ('Encap', 'Port_Binding', 'Datapath_Binding', 'SB_Global',
-                  'Chassis', 'Chassis_Private')
+                  'Chassis')
         events = (PortBindingChassisCreatedEvent(self),
                   PortBindingChassisDeletedEvent(self),
                   SbGlobalUpdateEvent(self),
-                  PortBindingMetaPortUpdatedEvent(self),
-                  ChassisPrivateCreateEvent(self),
-                  )
+                  PortBindingMetaPortUpdatedEvent(self))
 
+        # TODO(lucasagomes): Remove this in the future. Try to register
+        # the Chassis_Private table, if not present, fallback to the normal
+        # Chassis table.
+        # Open the connection to OVN SB database.
+        self.has_chassis_private = False
         self._post_fork_event.clear()
-        self.sb_idl = ovsdb.MetadataAgentOvnSbIdl(
-            chassis=self.chassis, tables=tables, events=events).start()
+        try:
+            self.sb_idl = ovsdb.MetadataAgentOvnSbIdl(
+                chassis=self.chassis, tables=tables + ('Chassis_Private', ),
+                events=events + (ChassisPrivateCreateEvent(self), )).start()
+            self.has_chassis_private = True
+        except AssertionError:
+            self.sb_idl = ovsdb.MetadataAgentOvnSbIdl(
+                chassis=self.chassis, tables=tables,
+                events=events + (ChassisCreateEvent(self), )).start()
 
         # Now IDL connections can be safely used.
         self._post_fork_event.set()
@@ -323,10 +335,11 @@ class MetadataAgent(object):
     def register_metadata_agent(self):
         # NOTE(lucasagomes): db_add() will not overwrite the UUID if
         # it's already set.
+        table = ('Chassis_Private' if self.has_chassis_private else 'Chassis')
         # Generate unique, but consistent metadata id for chassis name
         agent_id = uuid.uuid5(self.chassis_id, 'metadata_agent')
         ext_ids = {ovn_const.OVN_AGENT_METADATA_ID_KEY: str(agent_id)}
-        self.sb_idl.db_add('Chassis_Private', self.chassis, 'external_ids',
+        self.sb_idl.db_add(table, self.chassis, 'external_ids',
                            ext_ids).execute(check_error=True)
 
     def _get_own_chassis_name(self):
diff --git a/neutron/cmd/sanity/checks.py b/neutron/cmd/sanity/checks.py
index 10dbf3c2cc5..329e99463a9 100644
--- a/neutron/cmd/sanity/checks.py
+++ b/neutron/cmd/sanity/checks.py
@@ -54,7 +54,6 @@ OVN_NB_DB_SCHEMA_PORT_GROUP = '5.11.0'
 OVN_NB_DB_SCHEMA_STATELESS_NAT = '5.17.0'
 OVN_SB_DB_SCHEMA_VIRTUAL_PORT = '2.5.0'
 OVN_LOCALNET_LEARN_FDB = '22.09.0'
-OVN_SB_DB_SCHEMA_CHASSIS_PRIVATE = '2.9.0'
 
 
 class OVNCheckType(enum.Enum):
@@ -680,17 +679,3 @@ def ovn_localnet_learn_fdb_support():
                   'Exception: %s', e)
         return False
     return True
-
-
-def ovn_sb_db_schema_chassis_private_supported():
-    try:
-        ver = _get_ovn_version(OVNCheckType.sb_db_schema)
-        minver = versionutils.convert_version_to_tuple(
-            OVN_SB_DB_SCHEMA_CHASSIS_PRIVATE)
-        if ver < minver:
-            return False
-    except (OSError, RuntimeError, ValueError) as e:
-        LOG.debug('Exception while checking OVN DB schema version. '
-                  'Exception: %s', e)
-        return False
-    return True
diff --git a/neutron/cmd/sanity_check.py b/neutron/cmd/sanity_check.py
index 70735bc6d96..8bd4318305b 100644
--- a/neutron/cmd/sanity_check.py
+++ b/neutron/cmd/sanity_check.py
@@ -352,13 +352,6 @@ def check_ovn_localnet_learn_fdb_support():
     if not result:
         LOG.warning('OVN does not support localnet_learn_fdb option. '
                     'This support was added in OVN 22.09.')
-
-
-def check_ovn_sb_db_schema_chassis_private():
-    result = checks.ovn_sb_db_schema_chassis_private_supported()
-    if not result:
-        LOG.warning('OVN SB DB schema does not support chassis private. This '
-                    'support was added in DB schema version 2.9.0.')
     return result
 
 
@@ -450,10 +443,6 @@ OPTS = [
                     check_ovn_localnet_learn_fdb_support,
                     help=_('Check OVN supports localnet_learn_fdb option'),
                     default=False),
-    BoolOptCallback('ovn_sb_db_schema_chassis_private_support',
-                    check_ovn_sb_db_schema_virtual_port,
-                    help=_('Check OVN SB DB schema support chassis private'),
-                    default=False),
 ]
 
 
diff --git a/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py b/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
index 4e58154f7fe..222c9e9cce8 100644
--- a/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
@@ -63,22 +63,19 @@ class NeutronAgent(abc.ABC):
             self.set_down = False
 
     @staticmethod
-    def _get_chassis(chassis_or_chassis_private):
-        """Return the chassis register
-
-        The input could be the chassis register itself or the chassis private.
-        """
+    def chassis_from_private(chassis_private):
         try:
-            return chassis_or_chassis_private.chassis[0]
+            return chassis_private.chassis[0]
         except AttributeError:
-            return chassis_or_chassis_private
+            # No Chassis_Private support, just use Chassis
+            return chassis_private
         except IndexError:
             # Chassis register has been deleted but not Chassis_Private.
             return DeletedChassis
 
     @property
     def chassis(self):
-        return self._get_chassis(self.chassis_private)
+        return self.chassis_from_private(self.chassis_private)
 
     def as_dict(self):
         return {
@@ -146,7 +143,7 @@ class ControllerAgent(NeutronAgent):
 
     @staticmethod  # it is by default, but this makes pep8 happy
     def __new__(cls, chassis_private, driver):
-        _chassis = cls._get_chassis(chassis_private)
+        _chassis = cls.chassis_from_private(chassis_private)
         other_config = ovn_utils.get_ovn_chassis_other_config(_chassis)
         if 'enable-chassis-as-gw' in other_config.get('ovn-cms-options', []):
             cls = ControllerGatewayAgent
@@ -171,7 +168,7 @@ class ControllerAgent(NeutronAgent):
 
     def update(self, chassis_private, clear_down=False):
         super().update(chassis_private, clear_down)
-        _chassis = self._get_chassis(chassis_private)
+        _chassis = self.chassis_from_private(chassis_private)
         other_config = ovn_utils.get_ovn_chassis_other_config(_chassis)
         if 'enable-chassis-as-gw' in other_config.get('ovn-cms-options', []):
             self.__class__ = ControllerGatewayAgent
@@ -182,7 +179,7 @@ class ControllerGatewayAgent(ControllerAgent):
 
     def update(self, chassis_private, clear_down=False):
         super().update(chassis_private, clear_down)
-        _chassis = self._get_chassis(chassis_private)
+        _chassis = self.chassis_from_private(chassis_private)
         other_config = ovn_utils.get_ovn_chassis_other_config(_chassis)
         if ('enable-chassis-as-gw' not in
                 other_config.get('ovn-cms-options', [])):
diff --git a/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py b/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
index a9a2353ce59..00178067daf 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
@@ -137,7 +137,10 @@ class OVNMechanismDriver(api.MechanismDriver):
                          OVN_MIN_GENEVE_MAX_HEADER_SIZE)
             raise SystemExit(1)
         self._setup_vif_port_bindings()
-        self.agent_chassis_table = 'Chassis_Private'
+        if impl_idl_ovn.OvsdbSbOvnIdl.schema_has_table('Chassis_Private'):
+            self.agent_chassis_table = 'Chassis_Private'
+        else:
+            self.agent_chassis_table = 'Chassis'
         self.subscribe()
         self.qos_driver = qos_driver.OVNQosDriver.create(self)
         self.trunk_driver = trunk_driver.OVNTrunkDriver.create(self)
diff --git a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py
index fc4b9fa80c9..9b0ba129aa9 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py
@@ -358,7 +358,8 @@ class ChassisAgentTypeChangeEvent(ChassisEvent):
                         'external_ids')
         if not getattr(old, other_config, False):
             return False
-        new_other_config = utils.get_ovn_chassis_other_config(row)
+        chassis = n_agent.NeutronAgent.chassis_from_private(row)
+        new_other_config = utils.get_ovn_chassis_other_config(chassis)
         old_other_config = utils.get_ovn_chassis_other_config(old)
         agent_type_change = new_other_config.get('ovn-cms-options', []) != (
             old_other_config.get('ovn-cms-options', []))
@@ -656,7 +657,6 @@ class BaseOvnIdl(Ml2OvnIdlBase):
 class BaseOvnSbIdl(Ml2OvnIdlBase):
     @classmethod
     def from_server(cls, connection_string, helper):
-        helper.register_table('Chassis_Private')
         helper.register_table('Chassis')
         helper.register_table('Encap')
         helper.register_table('Port_Binding')
@@ -713,6 +713,13 @@ class OvnIdlDistributedLock(BaseOvnIdl):
 
             self.update_tables(tables, row.schema[0])
 
+            if self.driver.agent_chassis_table == 'Chassis_Private':
+                if 'Chassis_Private' not in self.tables:
+                    self.driver.agent_chassis_table = 'Chassis'
+            else:
+                if 'Chassis_Private' in self.tables:
+                    self.driver.agent_chassis_table = 'Chassis_Private'
+
     def notify(self, event, row, updates=None):
         try:
             self.handle_db_schema_changes(event, row)
@@ -813,9 +820,10 @@ class OvnSbIdl(OvnIdlDistributedLock):
 
     @classmethod
     def from_server(cls, connection_string, helper, driver):
+        if 'Chassis_Private' in helper.schema_json['tables']:
+            helper.register_table('Chassis_Private')
         if 'FDB' in helper.schema_json['tables']:
             helper.register_table('FDB')
-        helper.register_table('Chassis_Private')
         helper.register_table('Chassis')
         helper.register_table('Encap')
         helper.register_table('Port_Binding')
diff --git a/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py b/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
index 8463b5f364b..d0d4aebac3a 100644
--- a/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
+++ b/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
@@ -85,7 +85,9 @@ class TestMetadataAgent(base.TestOVNFunctionalBase):
 
     @property
     def agent_chassis_table(self):
-        return 'Chassis_Private'
+        if self.agent.has_chassis_private:
+            return 'Chassis_Private'
+        return 'Chassis'
 
     def _start_metadata_agent(self):
         conf = self.useFixture(fixture_config.Config()).conf
diff --git a/neutron/tests/functional/base.py b/neutron/tests/functional/base.py
index 54d37b2e8a0..8ef793989eb 100644
--- a/neutron/tests/functional/base.py
+++ b/neutron/tests/functional/base.py
@@ -423,15 +423,17 @@ class TestOVNFunctionalBase(test_plugin.Ml2PluginV2TestCase,
             name, ['geneve'], '172.24.4.%d' % self._counter,
             external_ids=external_ids, hostname=host,
             other_config=other_config).execute(check_error=True)
-        nb_cfg_timestamp = timeutils.utcnow_ts() * 1000
-        self.sb_api.db_create(
-            'Chassis_Private', name=name, external_ids=external_ids,
-            chassis=chassis.uuid, nb_cfg_timestamp=nb_cfg_timestamp
-        ).execute(check_error=True)
+        if self.sb_api.is_table_present('Chassis_Private'):
+            nb_cfg_timestamp = timeutils.utcnow_ts() * 1000
+            self.sb_api.db_create(
+                'Chassis_Private', name=name, external_ids=external_ids,
+                chassis=chassis.uuid, nb_cfg_timestamp=nb_cfg_timestamp
+            ).execute(check_error=True)
         return name
 
     def del_fake_chassis(self, chassis, if_exists=True):
         self.sb_api.chassis_del(
             chassis, if_exists=if_exists).execute(check_error=True)
-        self.sb_api.db_destroy(
-            'Chassis_Private', chassis).execute(check_error=True)
+        if self.sb_api.is_table_present('Chassis_Private'):
+            self.sb_api.db_destroy(
+                'Chassis_Private', chassis).execute(check_error=True)
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
index d52259457b0..1eea038c018 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
@@ -470,6 +470,8 @@ class TestAgentMonitor(base.TestOVNFunctionalBase):
                 int(chassis_ts / 1000), datetime.timezone.utc)
             return agent.updated_at == updated_at
 
+        if not self.sb_api.is_table_present('Chassis_Private'):
+            self.skipTest('Ovn sb not support Chassis_Private')
         timestamp = timeutils.utcnow_ts()
         nb_cfg_timestamp = timestamp * 1000
         self.sb_api.db_set('Chassis_Private', self.chassis_name, (
@@ -502,6 +504,9 @@ class TestAgentMonitor(base.TestOVNFunctionalBase):
             agent = neutron_agent.AgentCache()[self.chassis_name]
             return agent.updated_at != 0
 
+        if not self.sb_api.is_table_present('Chassis_Private'):
+            self.skipTest('Ovn sb not support Chassis_Private')
+
         # Set nb_cfg to some realistic value, so that the alive check can
         # actually work
         self.nb_api.db_set(
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
index 1b937e4f18c..e1abd67c8e9 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
@@ -1179,11 +1179,15 @@ class TestAgentApi(base.TestOVNFunctionalBase):
         agent_id = self.agent_types[ovn_const.OVN_CONTROLLER_AGENT]
         agent = self.plugin.get_agent(self.context, agent_id)
         heartbeat_timestamp = agent['heartbeat_timestamp']
-        chassis_ts = self.sb_api.db_get(
-            'Chassis_Private', self.chassis, 'nb_cfg_timestamp'
-        ).execute(check_error=True)
-        updated_at = datetime.datetime.fromtimestamp(int(chassis_ts / 1000))
-        self.assertEqual(updated_at, heartbeat_timestamp)
+        if self.sb_api.is_table_present('Chassis_Private'):
+            chassis_ts = self.sb_api.db_get(
+                'Chassis_Private', self.chassis, 'nb_cfg_timestamp'
+            ).execute(check_error=True)
+            updated_at = datetime.datetime.fromtimestamp(
+                int(chassis_ts / 1000))
+            # if table Chassis_Private present, agent.updated_at is
+            # Chassis_Private.nb_cfg_timestamp
+            self.assertEqual(updated_at, heartbeat_timestamp)
         time.sleep(1)
         # if chassis is not updated, agent's heartbeat_timestamp shouldn't
         # be updated.
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/agent/test_neutron_agent.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/agent/test_neutron_agent.py
index b3c8d73b82e..9f92a65ff07 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/agent/test_neutron_agent.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/agent/test_neutron_agent.py
@@ -16,7 +16,6 @@ import datetime
 from unittest import mock
 
 import eventlet
-from oslo_utils import timeutils
 
 from neutron.common.ovn import constants as ovn_const
 from neutron.plugins.ml2.drivers.ovn.agent import neutron_agent
@@ -32,13 +31,8 @@ class AgentCacheTestCase(base.BaseTestCase):
         self.addCleanup(self._clean_agent_cache)
         self.names_ref = []
         for i in range(10):  # Add 10 agents.
-            chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(
-                attrs={'other_config': {}})
             chassis_private = fakes.FakeOvsdbRow.create_one_ovsdb_row(
-                attrs={'name': 'chassis' + str(i),
-                       'other_config': {},
-                       'chassis': [chassis],
-                       'nb_cfg_timestamp': timeutils.utcnow_ts() * 1000})
+                attrs={'name': 'chassis' + str(i), 'other_config': {}})
             self.agent_cache.update(ovn_const.OVN_CONTROLLER_AGENT,
                                     chassis_private)
             self.names_ref.append('chassis' + str(i))
@@ -55,12 +49,8 @@ class AgentCacheTestCase(base.BaseTestCase):
 
     def _add_and_delete_agents(self):
         del self.agent_cache['chassis8']
-        chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(
-            attrs={'other_config': {}})
         chassis_private = fakes.FakeOvsdbRow.create_one_ovsdb_row(
-            attrs={'name': 'chassis10',
-                   'chassis': [chassis],
-                   'nb_cfg_timestamp': timeutils.utcnow_ts() * 1000})
+            attrs={'name': 'chassis10'})
         self.agent_cache.update(ovn_const.OVN_CONTROLLER_AGENT,
                                 chassis_private)
 
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-nb.ovsschema b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-nb.ovsschema
index 174364c8b14..a06972aa061 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-nb.ovsschema
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-nb.ovsschema
@@ -1,17 +1,14 @@
 {
     "name": "OVN_Northbound",
-    "version": "6.3.0",
-    "cksum": "4042813038 31869",
+    "version": "5.23.0",
+    "cksum": "111023208 25806",
     "tables": {
         "NB_Global": {
             "columns": {
                 "name": {"type": "string"},
                 "nb_cfg": {"type": {"key": "integer"}},
-                "nb_cfg_timestamp": {"type": {"key": "integer"}},
                 "sb_cfg": {"type": {"key": "integer"}},
-                "sb_cfg_timestamp": {"type": {"key": "integer"}},
                 "hv_cfg": {"type": {"key": "integer"}},
-                "hv_cfg_timestamp": {"type": {"key": "integer"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}},
@@ -30,19 +27,6 @@
                 "ipsec": {"type": "boolean"}},
             "maxRows": 1,
             "isRoot": true},
-        "Copp": {
-            "columns": {
-                "name": {"type": "string"},
-                "meters": {
-                    "type": {"key": "string",
-                             "value": "string",
-                             "min": 0,
-                             "max": "unlimited"}},
-                "external_ids": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}}},
-            "indexes": [["name"]],
-            "isRoot": true},
         "Logical_Switch": {
             "columns": {
                 "name": {"type": "string"},
@@ -66,19 +50,11 @@
                                                   "refType": "weak"},
                                            "min": 0,
                                            "max": "unlimited"}},
-                "load_balancer_group": {
-                    "type": {"key": {"type": "uuid",
-                                     "refTable": "Load_Balancer_Group"},
-                             "min": 0,
-                             "max": "unlimited"}},
                 "dns_records": {"type": {"key": {"type": "uuid",
                                          "refTable": "DNS",
                                          "refType": "weak"},
                                   "min": 0,
                                   "max": "unlimited"}},
-                "copp": {"type": {"key": {"type": "uuid", "refTable": "Copp",
-                                          "refType": "weak"},
-                                  "min": 0, "max": 1}},
                 "other_config": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}},
@@ -209,25 +185,10 @@
                                 ["eth_src", "eth_dst", "ip_src", "ip_dst",
                                  "tp_src", "tp_dst"]]},
                              "min": 0, "max": "unlimited"}},
-                "options": {
-                     "type": {"key": "string",
-                              "value": "string",
-                              "min": 0,
-                              "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "isRoot": true},
-        "Load_Balancer_Group": {
-            "columns": {
-                "name": {"type": "string"},
-                "load_balancer": {"type": {"key": {"type": "uuid",
-                                                   "refTable": "Load_Balancer",
-                                                   "refType": "weak"},
-                                 "min": 0,
-                                 "max": "unlimited"}}},
-            "indexes": [["name"]],
-            "isRoot": true},
         "Load_Balancer_Health_Check": {
             "columns": {
                 "vip": {"type": "string"},
@@ -252,10 +213,7 @@
                                             "enum": ["set", ["from-lport", "to-lport"]]}}},
                 "match": {"type": "string"},
                 "action": {"type": {"key": {"type": "string",
-                                            "enum": ["set",
-                                               ["allow", "allow-related",
-                                                "allow-stateless", "drop",
-                                                "reject"]]}}},
+                                            "enum": ["set", ["allow", "allow-related", "drop", "reject"]]}}},
                 "log": {"type": "boolean"},
                 "severity": {"type": {"key": {"type": "string",
                                               "enum": ["set",
@@ -264,14 +222,6 @@
                                                         "debug"]]},
                                       "min": 0, "max": 1}},
                 "meter": {"type": {"key": "string", "min": 0, "max": 1}},
-                "label": {"type": {"key": {"type": "integer",
-                                           "minInteger": 0,
-                                           "maxInteger": 4294967295}}},
-                "options": {
-                     "type": {"key": "string",
-                              "value": "string",
-                              "min": 0,
-                              "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
@@ -311,7 +261,6 @@
                                            "refType": "strong"},
                                    "min": 1,
                                    "max": "unlimited"}},
-                "fair": {"type": {"key": "boolean", "min": 0, "max": 1}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
@@ -361,14 +310,6 @@
                                                   "refType": "weak"},
                                            "min": 0,
                                            "max": "unlimited"}},
-                "load_balancer_group": {
-                    "type": {"key": {"type": "uuid",
-                                     "refTable": "Load_Balancer_Group"},
-                             "min": 0,
-                             "max": "unlimited"}},
-                "copp": {"type": {"key": {"type": "uuid", "refTable": "Copp",
-                                          "refType": "weak"},
-                                  "min": 0, "max": 1}},
                 "options": {
                      "type": {"key": "string",
                               "value": "string",
@@ -417,7 +358,6 @@
             "isRoot": false},
         "Logical_Router_Static_Route": {
             "columns": {
-                "route_table": {"type": "string"},
                 "ip_prefix": {"type": "string"},
                 "policy": {"type": {"key": {"type": "string",
                                             "enum": ["set", ["src-ip",
@@ -425,13 +365,6 @@
                                     "min": 0, "max": 1}},
                 "nexthop": {"type": "string"},
                 "output_port": {"type": {"key": "string", "min": 0, "max": 1}},
-                "bfd": {"type": {"key": {"type": "uuid", "refTable": "BFD",
-                                          "refType": "weak"},
-                                  "min": 0,
-                                  "max": 1}},
-                "options": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
@@ -446,11 +379,6 @@
                     "key": {"type": "string",
                             "enum": ["set", ["allow", "drop", "reroute"]]}}},
                 "nexthop": {"type": {"key": "string", "min": 0, "max": 1}},
-                "nexthops": {"type": {
-                    "key": "string", "min": 0, "max": "unlimited"}},
-                "options": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
@@ -469,22 +397,6 @@
                                                              "snat",
                                                              "dnat_and_snat"
                                                                ]]}}},
-                "allowed_ext_ips": {"type": {
-                    "key": {"type": "uuid", "refTable": "Address_Set",
-                            "refType": "strong"},
-                    "min": 0,
-                    "max": 1}},
-                "exempted_ext_ips": {"type": {
-                    "key": {"type": "uuid", "refTable": "Address_Set",
-                            "refType": "strong"},
-                    "min": 0,
-                    "max": 1}},
-                "gateway_port": {
-                    "type": {"key": {"type": "uuid",
-                                     "refTable": "Logical_Router_Port",
-                                     "refType": "weak"},
-                             "min": 0,
-                             "max": 1}},
                 "options": {"type": {"key": "string", "value": "string",
                                      "min": 0, "max": "unlimited"}},
                 "external_ids": {
@@ -587,39 +499,5 @@
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "indexes": [["name"]],
-            "isRoot": true},
-        "BFD": {
-            "columns": {
-                "logical_port": {"type": "string"},
-                "dst_ip": {"type": "string"},
-                "min_tx": {"type": {"key": {"type": "integer",
-                                            "minInteger": 1},
-                                    "min": 0, "max": 1}},
-                "min_rx": {"type": {"key": {"type": "integer"},
-                                    "min": 0, "max": 1}},
-                "detect_mult": {"type": {"key": {"type": "integer",
-                                                 "minInteger": 1},
-                                    "min": 0, "max": 1}},
-                "status": {
-                    "type": {"key": {"type": "string",
-                             "enum": ["set", ["down", "init", "up",
-                                              "admin_down"]]},
-                             "min": 0, "max": 1}},
-                "external_ids": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
-                "options": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}}},
-            "indexes": [["logical_port", "dst_ip"]],
-            "isRoot": true},
-        "Static_MAC_Binding": {
-            "columns": {
-                "logical_port": {"type": "string"},
-                "ip": {"type": "string"},
-                "mac": {"type": "string"},
-                "override_dynamic_mac": {"type": "boolean"}},
-            "indexes": [["logical_port", "ip"]],
-             "isRoot": true}
+            "isRoot": true}}
     }
-}
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-sb.ovsschema b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-sb.ovsschema
index 576ebbdeb07..d89f8dbbbde 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-sb.ovsschema
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/schemas/ovn-sb.ovsschema
@@ -1,7 +1,7 @@
 {
     "name": "OVN_Southbound",
-    "version": "20.25.0",
-    "cksum": "53184112 28845",
+    "version": "2.7.0",
+    "cksum": "4286723485 21693",
     "tables": {
         "SB_Global": {
             "columns": {
@@ -38,28 +38,11 @@
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}},
-                "other_config": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
                 "transport_zones" : {"type": {"key": "string",
                                               "min": 0,
                                               "max": "unlimited"}}},
             "isRoot": true,
             "indexes": [["name"]]},
-        "Chassis_Private": {
-            "columns": {
-                "name": {"type": "string"},
-                "chassis": {"type": {"key": {"type": "uuid",
-                                             "refTable": "Chassis",
-                                             "refType": "weak"},
-                                     "min": 0, "max": 1}},
-                "nb_cfg": {"type": {"key": "integer"}},
-                "nb_cfg_timestamp": {"type": {"key": "integer"}},
-                "external_ids": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}}},
-            "isRoot": true,
-            "indexes": [["name"]]},
         "Encap": {
             "columns": {
                 "type": {"type": {"key": {
@@ -90,42 +73,23 @@
             "isRoot": true},
         "Logical_Flow": {
             "columns": {
-                "logical_datapath":
-                    {"type": {"key": {"type": "uuid",
-                                      "refTable": "Datapath_Binding"},
-                              "min": 0, "max": 1}},
-                "logical_dp_group":
-                    {"type": {"key": {"type": "uuid",
-                                      "refTable": "Logical_DP_Group"},
-                              "min": 0, "max": 1}},
+                "logical_datapath": {"type": {"key": {"type": "uuid",
+                                                      "refTable": "Datapath_Binding"}}},
                 "pipeline": {"type": {"key": {"type": "string",
                                       "enum": ["set", ["ingress",
                                                        "egress"]]}}},
                 "table_id": {"type": {"key": {"type": "integer",
                                               "minInteger": 0,
-                                              "maxInteger": 32}}},
+                                              "maxInteger": 23}}},
                 "priority": {"type": {"key": {"type": "integer",
                                               "minInteger": 0,
                                               "maxInteger": 65535}}},
                 "match": {"type": "string"},
                 "actions": {"type": "string"},
-                "tags": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
-                "controller_meter": {"type": {"key": {"type": "string"},
-                                     "min": 0, "max": 1}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "isRoot": true},
-        "Logical_DP_Group": {
-            "columns": {
-                "datapaths":
-                    {"type": {"key": {"type": "uuid",
-                                      "refTable": "Datapath_Binding",
-                                      "refType": "weak"},
-                              "min": 0, "max": "unlimited"}}},
-            "isRoot": false},
         "Multicast_Group": {
             "columns": {
                 "datapath": {"type": {"key": {"type": "uuid",
@@ -138,7 +102,7 @@
                 "ports": {"type": {"key": {"type": "uuid",
                                            "refTable": "Port_Binding",
                                            "refType": "weak"},
-                                   "min": 0, "max": "unlimited"}}},
+                                   "min": 1, "max": "unlimited"}}},
             "indexes": [["datapath", "tunnel_key"],
                         ["datapath", "name"]],
             "isRoot": true},
@@ -171,9 +135,6 @@
                      "type": {"key": {"type": "integer",
                                       "minInteger": 1,
                                       "maxInteger": 16777215}}},
-                "load_balancers": {"type": {"key": {"type": "uuid"},
-                                            "min": 0,
-                                            "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
@@ -218,41 +179,20 @@
                                              "refTable": "Chassis",
                                              "refType": "weak"},
                                      "min": 0, "max": 1}},
-                "additional_chassis": {"type": {"key": {"type": "uuid",
-                                                        "refTable": "Chassis",
-                                                        "refType": "weak"},
-                                               "min": 0, "max": "unlimited"}},
                 "encap": {"type": {"key": {"type": "uuid",
                                             "refTable": "Encap",
                                              "refType": "weak"},
                                     "min": 0, "max": 1}},
-                "additional_encap": {"type": {"key": {"type": "uuid",
-                                                      "refTable": "Encap",
-                                                      "refType": "weak"},
-                                    "min": 0, "max": "unlimited"}},
                 "mac": {"type": {"key": "string",
                                  "min": 0,
                                  "max": "unlimited"}},
-                "port_security": {"type": {"key": "string",
-                                 "min": 0,
-                                 "max": "unlimited"}},
                 "nat_addresses": {"type": {"key": "string",
                                            "min": 0,
                                            "max": "unlimited"}},
-                "up": {"type": {"key": "boolean", "min": 0, "max": 1}},
                 "external_ids": {"type": {"key": "string",
                                  "value": "string",
                                  "min": 0,
-                                 "max": "unlimited"}},
-                "requested_chassis": {"type": {"key": {"type": "uuid",
-                                                       "refTable": "Chassis",
-                                                       "refType": "weak"},
-                                               "min": 0, "max": 1}},
-                "requested_additional_chassis": {
-                                      "type": {"key": {"type": "uuid",
-                                                       "refTable": "Chassis",
-                                                       "refType": "weak"},
-                                               "min": 0, "max": "unlimited"}}},
+                                 "max": "unlimited"}}},
             "indexes": [["datapath", "tunnel_key"], ["logical_port"]],
             "isRoot": true},
         "MAC_Binding": {
@@ -260,7 +200,6 @@
                 "logical_port": {"type": "string"},
                 "ip": {"type": "string"},
                 "mac": {"type": "string"},
-                "timestamp": {"type": {"key": "integer"}},
                 "datapath": {"type": {"key": {"type": "uuid",
                                               "refTable": "Datapath_Binding"}}}},
             "indexes": [["logical_port", "ip"]],
@@ -275,8 +214,7 @@
                     "type": {"key": {
                         "type": "string",
                         "enum": ["set", ["bool", "uint8", "uint16", "uint32",
-                                         "ipv4", "static_routes", "str",
-                                         "host_id", "domains"]]}}}},
+                                         "ipv4", "static_routes", "str"]]}}}},
             "isRoot": true},
         "DHCPv6_Options": {
             "columns": {
@@ -476,7 +414,7 @@
                              "min": 0, "max": 1}},
                 "port": {"type": {"key": {"type": "integer",
                                           "minInteger": 0,
-                                          "maxInteger": 65535}}},
+                                          "maxInteger": 32767}}},
                 "logical_port": {"type": "string"},
                 "src_mac": {"type": "string"},
                 "src_ip": {"type": "string"},
@@ -491,80 +429,6 @@
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "indexes": [["logical_port", "ip", "port", "protocol"]],
-            "isRoot": true},
-        "Load_Balancer": {
-            "columns": {
-                "name": {"type": "string"},
-                "vips": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
-                "protocol": {
-                    "type": {"key": {"type": "string",
-                             "enum": ["set", ["tcp", "udp", "sctp"]]},
-                             "min": 0, "max": 1}},
-                "datapaths": {
-                    "type": {"key": {"type": "uuid",
-                                     "refTable": "Datapath_Binding"},
-                             "min": 0, "max": "unlimited"}},
-                "datapath_group":
-                    {"type": {"key": {"type": "uuid",
-                                      "refTable": "Logical_DP_Group"},
-                              "min": 0, "max": 1}},
-                "options": {
-                     "type": {"key": "string",
-                              "value": "string",
-                              "min": 0,
-                              "max": "unlimited"}},
-                "external_ids": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}}},
-            "isRoot": true},
-        "BFD": {
-            "columns": {
-                "src_port": {"type": {"key": {"type": "integer",
-                                          "minInteger": 49152,
-                                          "maxInteger": 65535}}},
-                "disc": {"type": {"key": {"type": "integer"}}},
-                "logical_port": {"type": "string"},
-                "dst_ip": {"type": "string"},
-                "min_tx": {"type": {"key": {"type": "integer"}}},
-                "min_rx": {"type": {"key": {"type": "integer"}}},
-                "detect_mult": {"type": {"key": {"type": "integer"}}},
-                "status": {
-                    "type": {"key": {"type": "string",
-                             "enum": ["set", ["down", "init", "up",
-                                              "admin_down"]]}}},
-                "external_ids": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}},
-                "options": {
-                    "type": {"key": "string", "value": "string",
-                             "min": 0, "max": "unlimited"}}},
-            "indexes": [["logical_port", "dst_ip", "src_port", "disc"]],
-            "isRoot": true},
-        "FDB": {
-            "columns": {
-                "mac": {"type": "string"},
-                "dp_key": {
-                     "type": {"key": {"type": "integer",
-                                      "minInteger": 1,
-                                      "maxInteger": 16777215}}},
-                "port_key": {
-                     "type": {"key": {"type": "integer",
-                                      "minInteger": 1,
-                                      "maxInteger": 16777215}}}},
-            "indexes": [["mac", "dp_key"]],
-            "isRoot": true},
-        "Static_MAC_Binding": {
-            "columns": {
-                "logical_port": {"type": "string"},
-                "ip": {"type": "string"},
-                "mac": {"type": "string"},
-                "override_dynamic_mac": {"type": "boolean"},
-                "datapath": {"type": {
-                                  "key": {"type": "uuid",
-                                          "refTable": "Datapath_Binding"}}}},
-            "indexes": [["logical_port", "ip"]],
             "isRoot": true}
     }
 }
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
index 443a19f1ab1..9523be67b03 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
@@ -302,20 +302,45 @@ class TestOvnIdlDistributedLock(base.BaseTestCase):
 
         self.assertFalse(self.mock_update_tables.called)
 
-    def _test_handle_db_schema(self, agent_table):
+    def _test_handle_db_schema(self, agent_table, chassis_private_present):
         database_table_row = self._create_fake_row('Database')
         self.idl._tables_to_register[database_table_row.name] = 'foo'
 
         self.fake_driver.agent_chassis_table = agent_table
-        self.idl.tables['Chassis_Private'] = 'foo'
+        if chassis_private_present:
+            self.idl.tables['Chassis_Private'] = 'foo'
+        else:
+            try:
+                del self.idl.tables['Chassis_Private']
+            except KeyError:
+                pass
+
         self.idl.handle_db_schema_changes(
             ovsdb_monitor.BaseEvent.ROW_CREATE, database_table_row)
 
+    def test_handle_db_schema_changes_old_schema_to_old_schema(self):
+        """Agents use Chassis and should keep using Chassis table"""
+        self._test_handle_db_schema('Chassis', chassis_private_present=False)
+        self.assertEqual('Chassis', self.fake_driver.agent_chassis_table)
+
+    def test_handle_db_schema_changes_old_schema_to_new_schema(self):
+        """Agents use Chassis and should start using Chassis_Private table"""
+        self._test_handle_db_schema('Chassis', chassis_private_present=True)
+        self.assertEqual('Chassis_Private',
+                         self.fake_driver.agent_chassis_table)
+
+    def test_handle_db_schema_changes_new_schema_to_old_schema(self):
+        """Agents use Chassis_Private and should start using Chassis table"""
+        self._test_handle_db_schema('Chassis_Private',
+                                    chassis_private_present=False)
+        self.assertEqual('Chassis', self.fake_driver.agent_chassis_table)
+
     def test_handle_db_schema_changes_new_schema_to_new_schema(self):
         """Agents use Chassis_Private and should keep using Chassis_Private
            table.
         """
-        self._test_handle_db_schema('Chassis_Private')
+        self._test_handle_db_schema('Chassis_Private',
+                                    chassis_private_present=True)
         self.assertEqual('Chassis_Private',
                          self.fake_driver.agent_chassis_table)
 
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
index 8a8f59b1f0d..9ebd918ca95 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
@@ -105,7 +105,6 @@ class MechDriverSetupBase(abc.ABC):
         chassis_private.nb_cfg = nb_cfg
         chassis_private.uuid = uuid.uuid4()
         chassis_private.name = name if name else str(uuid.uuid4())
-        chassis_private.nb_cfg_timestamp = timeutils.utcnow_ts() * 1000
         return chassis_private
 
     def _add_chassis_agent(self, nb_cfg, agent_type, chassis_private=None):
diff --git a/releasenotes/notes/ovn-support-chassis_private-35192565e9ee2a00.yaml b/releasenotes/notes/ovn-support-chassis_private-35192565e9ee2a00.yaml
deleted file mode 100644
index a933db5f513..00000000000
--- a/releasenotes/notes/ovn-support-chassis_private-35192565e9ee2a00.yaml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-features:
-  - |
-    Removed support for OVN versions under 20.09. The "Chassis_Private" OVN
-    Southbound table is expected in the database definition.