diff --git a/neutron/common/ovn/utils.py b/neutron/common/ovn/utils.py
index 4dcf097b16e..8a0edabc85c 100644
--- a/neutron/common/ovn/utils.py
+++ b/neutron/common/ovn/utils.py
@@ -641,8 +641,8 @@ def compute_address_pairs_diff(ovn_port, neutron_port):
 
 def get_ovn_cms_options(chassis):
     """Return the list of CMS options in a Chassis."""
-    return [opt.strip() for opt in chassis.external_ids.get(
-            constants.OVN_CMS_OPTIONS, '').split(',')]
+    return [opt.strip() for opt in get_ovn_chassis_other_config(chassis).get(
+        constants.OVN_CMS_OPTIONS, '').split(',')]
 
 
 def is_gateway_chassis(chassis):
@@ -831,3 +831,11 @@ def create_neutron_pg_drop():
         }]
 
     OvsdbClientTransactCommand.run(command)
+
+
+def get_ovn_chassis_other_config(chassis):
+    # NOTE(ralonsoh): LP#1990229 to be removed when min OVN version is 22.09
+    try:
+        return chassis.other_config
+    except AttributeError:
+        return chassis.external_ids
diff --git a/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py b/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
index d6b70201820..c0a234019bf 100644
--- a/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/ovn/agent/neutron_agent.py
@@ -89,7 +89,8 @@ class NeutronAgent(abc.ABC):
             'configurations': {
                 'chassis_name': self.chassis.name,
                 'bridge-mappings':
-                    self.chassis.external_ids.get('ovn-bridge-mappings', '')},
+                    ovn_utils.get_ovn_chassis_other_config(self.chassis).get(
+                        'ovn-bridge-mappings', '')},
             'start_flag': True,
             'agent_type': self.agent_type,
             'id': self.agent_id,
@@ -141,9 +142,9 @@ class ControllerAgent(NeutronAgent):
 
     @staticmethod  # it is by default, but this makes pep8 happy
     def __new__(cls, chassis_private, driver):
-        external_ids = cls.chassis_from_private(chassis_private).external_ids
-        if ('enable-chassis-as-gw' in
-                external_ids.get('ovn-cms-options', [])):
+        _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
         return super().__new__(cls)
 
@@ -166,8 +167,9 @@ class ControllerAgent(NeutronAgent):
 
     def update(self, chassis_private, clear_down=False):
         super().update(chassis_private, clear_down)
-        external_ids = self.chassis_from_private(chassis_private).external_ids
-        if 'enable-chassis-as-gw' in external_ids.get('ovn-cms-options', []):
+        _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
 
 
@@ -176,9 +178,10 @@ class ControllerGatewayAgent(ControllerAgent):
 
     def update(self, chassis_private, clear_down=False):
         super().update(chassis_private, clear_down)
-        external_ids = self.chassis_from_private(chassis_private).external_ids
+        _chassis = self.chassis_from_private(chassis_private)
+        other_config = ovn_utils.get_ovn_chassis_other_config(_chassis)
         if ('enable-chassis-as-gw' not in
-                external_ids.get('ovn-cms-options', [])):
+                other_config.get('ovn-cms-options', [])):
             self.__class__ = ControllerAgent
 
 
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 1942de61d73..b519c6f6a42 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
@@ -191,7 +191,8 @@ class OVNMechanismDriver(api.MechanismDriver):
     def get_supported_vif_types(self):
         vif_types = set()
         for ch in self.sb_ovn.chassis_list().execute(check_error=True):
-            dp_type = ch.external_ids.get('datapath-type', '')
+            other_config = ovn_utils.get_ovn_chassis_other_config(ch)
+            dp_type = other_config.get('datapath-type', '')
             if dp_type == ovn_const.CHASSIS_DATAPATH_NETDEV:
                 vif_types.add(portbindings.VIF_TYPE_VHOST_USER)
             else:
@@ -962,8 +963,9 @@ class OVNMechanismDriver(api.MechanismDriver):
                                       'agent': agent})
             return
         chassis = agent.chassis
-        datapath_type = chassis.external_ids.get('datapath-type', '')
-        iface_types = chassis.external_ids.get('iface-types', '')
+        other_config = ovn_utils.get_ovn_chassis_other_config(chassis)
+        datapath_type = other_config.get('datapath-type', '')
+        iface_types = other_config.get('iface-types', '')
         iface_types = iface_types.split(',') if iface_types else []
         chassis_physnets = self.sb_ovn._get_chassis_physnets(chassis)
         for segment_to_bind in context.segments_to_bind:
diff --git a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/placement.py b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/placement.py
index eab14543263..f372807fcad 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/placement.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/placement.py
@@ -42,7 +42,8 @@ def _parse_ovn_cms_options(chassis):
 
 
 def _parse_bridge_mappings(chassis):
-    bridge_mappings = chassis.external_ids.get('ovn-bridge-mappings', '')
+    other_config = ovn_utils.get_ovn_chassis_other_config(chassis)
+    bridge_mappings = other_config.get('ovn-bridge-mappings', '')
     bridge_mappings = helpers.parse_mappings(bridge_mappings.split(','),
                                              unique_values=False)
     return {k: [v] for k, v in bridge_mappings.items()}
diff --git a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py
index 5209126d8b2..8a8049bb83e 100644
--- a/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py
+++ b/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py
@@ -847,7 +847,8 @@ class OvsdbSbOvnIdl(sb_impl_idl.OvnSbApiIdlImpl, Backend):
         return cls(conn)
 
     def _get_chassis_physnets(self, chassis):
-        bridge_mappings = chassis.external_ids.get('ovn-bridge-mappings', '')
+        other_config = utils.get_ovn_chassis_other_config(chassis)
+        bridge_mappings = other_config.get('ovn-bridge-mappings', '')
         mapping_dict = helpers.parse_mappings(bridge_mappings.split(','))
         return list(mapping_dict.keys())
 
@@ -865,7 +866,8 @@ class OvsdbSbOvnIdl(sb_impl_idl.OvnSbApiIdlImpl, Backend):
         return [ch.name if name_only else ch
                 for ch in self.chassis_list().execute(check_error=True)
                 if ovn_const.CMS_OPT_CHASSIS_AS_GW in
-                ch.external_ids.get(ovn_const.OVN_CMS_OPTIONS, '').split(',')]
+                utils.get_ovn_chassis_other_config(ch).get(
+                    ovn_const.OVN_CMS_OPTIONS, '').split(',')]
 
     def get_chassis_and_physnets(self):
         chassis_info_dict = {}
@@ -890,7 +892,7 @@ class OvsdbSbOvnIdl(sb_impl_idl.OvnSbApiIdlImpl, Backend):
             if ('{}={}'
                 .format(ovn_const.CMS_OPT_CARD_SERIAL_NUMBER,
                         card_serial_number)
-                    in ch.external_ids.get(
+                    in utils.get_ovn_chassis_other_config(ch).get(
                         ovn_const.OVN_CMS_OPTIONS, '').split(',')):
                 return ch
         msg = _('Chassis with %s %s %s does not exist'
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 ef0856716d1..bb4259996d8 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
@@ -172,12 +172,21 @@ class ChassisEvent(row_event.RowEvent):
     def match_fn(self, event, row, old):
         if event != self.ROW_UPDATE:
             return True
-        # NOTE(lucasgomes): If the external_ids column wasn't updated
-        # (meaning, Chassis "gateway" status didn't change) just returns
-        if not hasattr(old, 'external_ids') and event == self.ROW_UPDATE:
+
+        # NOTE(ralonsoh): LP#1990229 to be removed when min OVN version is
+        # 22.09
+        other_config = ('other_config' if hasattr(row, 'other_config') else
+                        'external_ids')
+        # NOTE(lucasgomes): If the other_config/external_ids column wasn't
+        # updated (meaning, Chassis "gateway" status didn't change) just
+        # returns
+        if not hasattr(old, other_config) and event == self.ROW_UPDATE:
             return False
-        if (old.external_ids.get('ovn-bridge-mappings') !=
-                row.external_ids.get('ovn-bridge-mappings')):
+        old_br_mappings = utils.get_ovn_chassis_other_config(old).get(
+            'ovn-bridge-mappings')
+        new_br_mappings = utils.get_ovn_chassis_other_config(row).get(
+            'ovn-bridge-mappings')
+        if old_br_mappings != new_br_mappings:
             return True
         # Check if either the Gateway status or Availability Zones has
         # changed in the Chassis
@@ -192,8 +201,9 @@ class ChassisEvent(row_event.RowEvent):
     def run(self, event, row, old):
         host = row.hostname
         phy_nets = []
+        new_other_config = utils.get_ovn_chassis_other_config(row)
         if event != self.ROW_DELETE:
-            bridge_mappings = row.external_ids.get('ovn-bridge-mappings', '')
+            bridge_mappings = new_other_config.get('ovn-bridge-mappings', '')
             mapping_dict = helpers.parse_mappings(bridge_mappings.split(','))
             phy_nets = list(mapping_dict)
 
@@ -208,9 +218,10 @@ class ChassisEvent(row_event.RowEvent):
             if event == self.ROW_DELETE:
                 kwargs['event_from_chassis'] = row.name
             elif event == self.ROW_UPDATE:
-                old_mappings = old.external_ids.get('ovn-bridge-mappings',
+                old_other_config = utils.get_ovn_chassis_other_config(old)
+                old_mappings = old_other_config.get('ovn-bridge-mappings',
                                                     set()) or set()
-                new_mappings = row.external_ids.get('ovn-bridge-mappings',
+                new_mappings = new_other_config.get('ovn-bridge-mappings',
                                                     set()) or set()
                 if old_mappings:
                     old_mappings = set(old_mappings.split(','))
@@ -339,11 +350,17 @@ class ChassisAgentTypeChangeEvent(ChassisEvent):
     events = (BaseEvent.ROW_UPDATE,)
 
     def match_fn(self, event, row, old=None):
-        if not getattr(old, 'external_ids', False):
+        # NOTE(ralonsoh): LP#1990229 to be removed when min OVN version is
+        # 22.09
+        other_config = ('other_config' if hasattr(row, 'other_config') else
+                        'external_ids')
+        if not getattr(old, other_config, False):
             return False
-        agent_type_change = n_agent.NeutronAgent.chassis_from_private(
-                row).external_ids.get('ovn-cms-options', []) != (
-                        old.external_ids.get('ovn-cms-options', []))
+        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', []))
         return agent_type_change
 
     def run(self, event, row, old):
diff --git a/neutron/tests/functional/base.py b/neutron/tests/functional/base.py
index 55ecf7a256d..8321c2a6eeb 100644
--- a/neutron/tests/functional/base.py
+++ b/neutron/tests/functional/base.py
@@ -423,7 +423,8 @@ class TestOVNFunctionalBase(test_plugin.Ml2PluginV2TestCase,
         self._start_ovn_northd()
 
     def add_fake_chassis(self, host, physical_nets=None, external_ids=None,
-                         name=None, azs=None, enable_chassis_as_gw=False):
+                         name=None, azs=None, enable_chassis_as_gw=False,
+                         other_config=None):
         def append_cms_options(ext_ids, value):
             if 'ovn-cms-options' not in ext_ids:
                 ext_ids['ovn-cms-options'] = value
@@ -432,19 +433,20 @@ class TestOVNFunctionalBase(test_plugin.Ml2PluginV2TestCase,
 
         physical_nets = physical_nets or []
         external_ids = external_ids or {}
+        other_config = other_config or {}
         if azs is None:
             azs = ['ovn']
         if azs:
-            append_cms_options(external_ids, 'availability-zones=')
-            external_ids['ovn-cms-options'] += ':'.join(azs)
+            append_cms_options(other_config, 'availability-zones=')
+            other_config['ovn-cms-options'] += ':'.join(azs)
         if enable_chassis_as_gw:
-            append_cms_options(external_ids, 'enable-chassis-as-gw')
+            append_cms_options(other_config, 'enable-chassis-as-gw')
 
         bridge_mapping = ",".join(["%s:br-provider%s" % (phys_net, i)
                                   for i, phys_net in enumerate(physical_nets)])
         if name is None:
             name = uuidutils.generate_uuid()
-        external_ids['ovn-bridge-mappings'] = bridge_mapping
+        other_config['ovn-bridge-mappings'] = bridge_mapping
         # We'll be using different IP addresses every time for the Encap of
         # the fake chassis as the SB schema doesn't allow to have two entries
         # with same (ip,type) pairs as of OVS 2.11. This shouldn't have any
@@ -455,7 +457,8 @@ class TestOVNFunctionalBase(test_plugin.Ml2PluginV2TestCase,
         self._counter += 1
         chassis = self.sb_api.chassis_add(
             name, ['geneve'], '172.24.4.%d' % self._counter,
-            external_ids=external_ids, hostname=host).execute(check_error=True)
+            external_ids=external_ids, hostname=host,
+            other_config=other_config).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(
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_placement.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_placement.py
index 5e808fe7eaf..327718d7c93 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_placement.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_placement.py
@@ -72,7 +72,7 @@ class TestOVNClientQosExtension(base.TestOVNFunctionalBase):
         self.mock_send_batch = mock.patch.object(
             placement_extension, '_send_deferred_batch').start()
 
-    def _build_external_ids(self, bandwidths, inventory_defaults, hypervisors):
+    def _build_other_config(self, bandwidths, inventory_defaults, hypervisors):
         options = []
         if bandwidths:
             options.append(n_const.RP_BANDWIDTHS + '=' + bandwidths)
@@ -85,17 +85,17 @@ class TestOVNClientQosExtension(base.TestOVNFunctionalBase):
 
     def _create_chassis(self, host, name, physical_nets=None, bandwidths=None,
                         inventory_defaults=None, hypervisors=None):
-        external_ids = self._build_external_ids(bandwidths, inventory_defaults,
+        other_config = self._build_other_config(bandwidths, inventory_defaults,
                                                 hypervisors)
         self.add_fake_chassis(host, physical_nets=physical_nets,
-                              external_ids=external_ids, name=name)
+                              other_config=other_config, name=name)
 
     def _update_chassis(self, name, bandwidths=None, inventory_defaults=None,
                         hypervisors=None):
-        external_ids = self._build_external_ids(bandwidths, inventory_defaults,
+        other_config = self._build_other_config(bandwidths, inventory_defaults,
                                                 hypervisors)
         self.sb_api.db_set(
-            'Chassis', name, ('external_ids', external_ids)
+            'Chassis', name, ('other_config', other_config)
         ).execute(check_error=True)
 
     def _check_placement_config(self, expected_chassis):
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl.py
index cc5718713b5..8ae4f969f72 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl.py
@@ -52,11 +52,11 @@ class TestSbApi(BaseOvnIdlTest):
         super(TestSbApi, self).setUp()
         self.data = {
             'chassis': [
-                {'external_ids': {'ovn-bridge-mappings':
+                {'other_config': {'ovn-bridge-mappings':
                                   'public:br-ex,private:br-0'}},
-                {'external_ids': {'ovn-bridge-mappings':
+                {'other_config': {'ovn-bridge-mappings':
                                   'public:br-ex,public2:br-ex2'}},
-                {'external_ids': {'ovn-bridge-mappings':
+                {'other_config': {'ovn-bridge-mappings':
                                   'public:br-ex'}},
             ]
         }
@@ -70,7 +70,7 @@ class TestSbApi(BaseOvnIdlTest):
                 txn.add(self.api.chassis_add(
                     chassis['name'], ['geneve'], chassis['hostname'],
                     hostname=chassis['hostname'],
-                    external_ids=chassis['external_ids']))
+                    other_config=chassis['other_config']))
 
     def test_get_chassis_hostname_and_physnets(self):
         mapping = self.api.get_chassis_hostname_and_physnets()
@@ -97,7 +97,7 @@ class TestSbApi(BaseOvnIdlTest):
     def test_multiple_physnets_in_one_bridge(self):
         self.data = {
             'chassis': [
-                {'external_ids': {'ovn-bridge-mappings': 'p1:br-ex,p2:br-ex'}}
+                {'other_config': {'ovn-bridge-mappings': 'p1:br-ex,p2:br-ex'}}
             ]
         }
         self.load_test_data()
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 8854afeae99..d130ad7e40d 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
@@ -441,9 +441,8 @@ class TestAgentMonitor(base.TestOVNFunctionalBase):
             chassis_name, self.mech_driver.agent_chassis_table)
         self.mech_driver.sb_ovn.idl.notify_handler.watch_event(row_event)
         self.chassis_name = self.add_fake_chassis(
-            self.FAKE_CHASSIS_HOST,
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'},
-            name=chassis_name)
+            self.FAKE_CHASSIS_HOST, name=chassis_name,
+            enable_chassis_as_gw=True)
         self.assertTrue(row_event.wait())
         n_utils.wait_until_true(
             lambda: len(list(neutron_agent.AgentCache())) == 1)
@@ -451,11 +450,11 @@ class TestAgentMonitor(base.TestOVNFunctionalBase):
     def test_agent_change_controller(self):
         self.assertEqual(neutron_agent.ControllerGatewayAgent,
                 type(neutron_agent.AgentCache()[self.chassis_name]))
-        self.sb_api.db_set('Chassis', self.chassis_name, ('external_ids',
+        self.sb_api.db_set('Chassis', self.chassis_name, ('other_config',
                 {'ovn-cms-options': ''})).execute(check_error=True)
         n_utils.wait_until_true(lambda:
                 neutron_agent.AgentCache()[self.chassis_name].
-                chassis.external_ids['ovn-cms-options'] == '')
+                chassis.other_config['ovn-cms-options'] == '')
         self.assertEqual(neutron_agent.ControllerAgent,
                 type(neutron_agent.AgentCache()[self.chassis_name]))
 
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 88e8e3c37ac..e3de3b5e3b4 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
@@ -66,16 +66,16 @@ class TestPortBinding(base.TestOVNFunctionalBase):
         self.add_fake_chassis(self.ovs_host)
         self.add_fake_chassis(
             self.dpdk_host,
-            external_ids={'datapath-type': 'netdev',
+            other_config={'datapath-type': 'netdev',
                           'iface-types': 'dummy,dummy-internal,dpdkvhostuser'})
 
         self.add_fake_chassis(
             self.invalid_dpdk_host,
-            external_ids={'datapath-type': 'netdev',
+            other_config={'datapath-type': 'netdev',
                           'iface-types': 'dummy,dummy-internal,geneve,vxlan'})
         self.add_fake_chassis(
             self.smartnic_dpu_host,
-            external_ids={ovn_const.OVN_CMS_OPTIONS: '{}={}'.format(
+            other_config={ovn_const.OVN_CMS_OPTIONS: '{}={}'.format(
                 ovn_const.CMS_OPT_CARD_SERIAL_NUMBER,
                 self.smartnic_dpu_serial)})
         self.n1 = self._make_network(self.fmt, 'n1', True)
diff --git a/neutron/tests/functional/services/ovn_l3/test_plugin.py b/neutron/tests/functional/services/ovn_l3/test_plugin.py
index 8ef3f1d543d..9085682c9d5 100644
--- a/neutron/tests/functional/services/ovn_l3/test_plugin.py
+++ b/neutron/tests/functional/services/ovn_l3/test_plugin.py
@@ -135,7 +135,7 @@ class TestRouter(base.TestOVNFunctionalBase):
         # Test if chassis3 is selected as candidate or not.
         self.chassis3 = self.add_fake_chassis(
             'ovs-host3', physical_nets=['physnet1'],
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'})
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'})
         self._check_gateway_chassis_candidates([self.chassis3])
 
     def test_gateway_chassis_with_cms_and_no_bridge_mappings(self):
@@ -143,7 +143,7 @@ class TestRouter(base.TestOVNFunctionalBase):
         # chassis3 is having enable-chassis-as-gw, but no bridge mappings.
         self.chassis3 = self.add_fake_chassis(
             'ovs-host3',
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'})
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'})
         ovn_client = self.l3_plugin._ovn_client
         ext1 = self._create_ext_network(
             'ext1', 'vlan', 'physnet1', 1, "10.0.0.1", "10.0.0.0/24")
@@ -170,11 +170,11 @@ class TestRouter(base.TestOVNFunctionalBase):
         # Test if chassis3 is selected as candidate or not.
         self.chassis3 = self.add_fake_chassis(
             'ovs-host3', physical_nets=['physnet1'],
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'},
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'},
             azs=['ovn'])
         self.chassis4 = self.add_fake_chassis(
             'ovs-host4', physical_nets=['physnet1'],
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'},
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'},
             azs=['ovn2'])
         self._check_gateway_chassis_candidates([self.chassis3],
                                                router_az_hints=['ovn'])
@@ -186,10 +186,10 @@ class TestRouter(base.TestOVNFunctionalBase):
         # add chassis4 is having azs [ovn2], not match routers az_hints [ovn]
         self.chassis3 = self.add_fake_chassis(
             'ovs-host3', physical_nets=['physnet1'],
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'})
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'})
         self.chassis4 = self.add_fake_chassis(
             'ovs-host4', physical_nets=['physnet1'],
-            external_ids={'ovn-cms-options': 'enable-chassis-as-gw'},
+            other_config={'ovn-cms-options': 'enable-chassis-as-gw'},
             azs=['ovn2'])
         ovn_client = self.l3_plugin._ovn_client
         ext1 = self._create_ext_network(
@@ -535,7 +535,7 @@ class TestRouter(base.TestOVNFunctionalBase):
             self.skipTest('L3 HA not supported')
         ovn_client = self.l3_plugin._ovn_client
         chassis4 = self.add_fake_chassis(
-            'ovs-host4', physical_nets=['physnet4'], external_ids={
+            'ovs-host4', physical_nets=['physnet4'], other_config={
                 'ovn-cms-options': 'enable-chassis-as-gw'})
         ovn_client._ovn_scheduler = l3_sched.OVNGatewayLeastLoadedScheduler()
         ext1 = self._create_ext_network(
@@ -567,7 +567,7 @@ class TestRouter(base.TestOVNFunctionalBase):
 
         # Add another chassis as a gateway chassis
         chassis5 = self.add_fake_chassis(
-            'ovs-host5', physical_nets=['physnet4'], external_ids={
+            'ovs-host5', physical_nets=['physnet4'], other_config={
                 'ovn-cms-options': 'enable-chassis-as-gw'})
         # Add a node as compute node. Compute node wont be
         # used to schedule the router gateway ports therefore
@@ -597,8 +597,7 @@ class TestRouter(base.TestOVNFunctionalBase):
             chassis_list.append(
                 self.add_fake_chassis(
                     'ovs-host%s' % i, physical_nets=['physnet1'],
-                    external_ids={
-                        'ovn-cms-options': 'enable-chassis-as-gw'}))
+                    other_config={'ovn-cms-options': 'enable-chassis-as-gw'}))
 
         ext1 = self._create_ext_network(
             'ext1', 'vlan', 'physnet1', 1, "10.0.0.1", "10.0.0.0/24")
diff --git a/neutron/tests/unit/common/ovn/test_utils.py b/neutron/tests/unit/common/ovn/test_utils.py
index a5674e57e51..f622a997a0e 100644
--- a/neutron/tests/unit/common/ovn/test_utils.py
+++ b/neutron/tests/unit/common/ovn/test_utils.py
@@ -62,33 +62,31 @@ class TestUtils(base.BaseTestCase):
 
     def test_is_gateway_chassis(self):
         chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {'ovn-cms-options': 'enable-chassis-as-gw'}})
+            'other_config': {'ovn-cms-options': 'enable-chassis-as-gw'}})
         non_gw_chassis_0 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {'ovn-cms-options': ''}})
-        non_gw_chassis_1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={})
-        non_gw_chassis_2 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {}})
+            'other_config': {'ovn-cms-options': ''}})
+        non_gw_chassis_1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
+            'other_config': {}})
 
         self.assertTrue(utils.is_gateway_chassis(chassis))
         self.assertFalse(utils.is_gateway_chassis(non_gw_chassis_0))
         self.assertFalse(utils.is_gateway_chassis(non_gw_chassis_1))
-        self.assertFalse(utils.is_gateway_chassis(non_gw_chassis_2))
 
     def test_get_chassis_availability_zones_no_azs(self):
         chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {'ovn-cms-options': 'enable-chassis-as-gw'}})
+            'other_config': {'ovn-cms-options': 'enable-chassis-as-gw'}})
         self.assertEqual(set(), utils.get_chassis_availability_zones(chassis))
 
     def test_get_chassis_availability_zones_one_az(self):
         chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {'ovn-cms-options':
+            'other_config': {'ovn-cms-options':
                              'enable-chassis-as-gw,availability-zones=az0'}})
         self.assertEqual(
             {'az0'}, utils.get_chassis_availability_zones(chassis))
 
     def test_get_chassis_availability_zones_multiple_az(self):
         chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options':
                 'enable-chassis-as-gw,availability-zones=az0:az1 :az2:: :'}})
         self.assertEqual(
@@ -97,7 +95,7 @@ class TestUtils(base.BaseTestCase):
 
     def test_get_chassis_availability_zones_malformed(self):
         chassis = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
-            'external_ids': {'ovn-cms-options':
+            'other_config': {'ovn-cms-options':
                              'enable-chassis-as-gw,availability-zones:az0'}})
         self.assertEqual(
             set(), utils.get_chassis_availability_zones(chassis))
@@ -156,16 +154,16 @@ class TestUtils(base.BaseTestCase):
     def test_get_chassis_in_azs(self):
         ch0 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch0',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options':
                 'enable-chassis-as-gw,availability-zones=az0:az1:az2'}})
         ch1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch1',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options': 'enable-chassis-as-gw'}})
         ch2 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch2',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options':
                 'enable-chassis-as-gw,availability-zones=az1:az5'}})
 
@@ -183,21 +181,21 @@ class TestUtils(base.BaseTestCase):
     def test_get_gateway_chassis_without_azs(self):
         ch0 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch0',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options':
                 'enable-chassis-as-gw,availability-zones=az0:az1:az2'}})
         ch1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch1',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options': 'enable-chassis-as-gw'}})
         ch2 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch2',
-            'external_ids': {
+            'other_config': {
                 'ovn-cms-options':
                 'enable-chassis-as-gw,availability-zones=az1:az5'}})
         ch3 = fakes.FakeOvsdbRow.create_one_ovsdb_row(attrs={
             'name': 'ch3',
-            'external_ids': {}})
+            'other_config': {}})
 
         chassis_list = [ch0, ch1, ch2, ch3]
         self.assertEqual(
diff --git a/neutron/tests/unit/fake_resources.py b/neutron/tests/unit/fake_resources.py
index 0b379d2014a..adedce8f32b 100644
--- a/neutron/tests/unit/fake_resources.py
+++ b/neutron/tests/unit/fake_resources.py
@@ -877,20 +877,23 @@ class FakeChassis(object):
             cms_opts.append('%s=%s' % (ovn_const.CMS_OPT_CARD_SERIAL_NUMBER,
                                        card_serial_number))
 
-        external_ids = {}
+        # NOTE(ralonsoh): LP#1990229, once min OVN version >= 20.06, the CMS
+        # options and the bridge mappings should be stored only in
+        # "other_config".
+        other_config = {}
         if cms_opts:
-            external_ids[ovn_const.OVN_CMS_OPTIONS] = ','.join(cms_opts)
+            other_config[ovn_const.OVN_CMS_OPTIONS] = ','.join(cms_opts)
 
         if bridge_mappings:
-            external_ids['ovn-bridge-mappings'] = ','.join(bridge_mappings)
+            other_config['ovn-bridge-mappings'] = ','.join(bridge_mappings)
 
         chassis_attrs = {
             'encaps': [],
-            'external_ids': external_ids,
+            'external_ids': '',
             'hostname': '',
             'name': uuidutils.generate_uuid(),
             'nb_cfg': 0,
-            'other_config': {},
+            'other_config': other_config,
             'transport_zones': [],
             'vtep_logical_switches': []}
 
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 ed434cab186..cd92c937534 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
@@ -31,7 +31,7 @@ class AgentCacheTestCase(base.BaseTestCase):
         self.names_ref = []
         for i in range(10):  # Add 10 agents.
             chassis_private = fakes.FakeOvsdbRow.create_one_ovsdb_row(
-                attrs={'name': 'chassis' + str(i)})
+                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))
diff --git a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl_ovn.py b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl_ovn.py
index 1b646c567a1..209a41bf98c 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl_ovn.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_impl_idl_ovn.py
@@ -820,7 +820,7 @@ class TestSBImplIdlOvnBase(TestDBImplIdlOvn):
         'chassis': [
             {
                 'hostname': 'fake-smartnic-dpu-chassis.fqdn',
-                'external_ids': {
+                'other_config': {
                     ovn_const.OVN_CMS_OPTIONS: (
                         'firstoption,'
                         'card-serial-number=fake-serial,'
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 d7c5f083043..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
@@ -81,6 +81,9 @@ OVN_SB_SCHEMA = {
                 "name": {"type": "string"},
                 "hostname": {"type": "string"},
                 "external_ids": {
+                    "type": {"key": "string", "value": "string",
+                             "min": 0, "max": "unlimited"}},
+                "other_config": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "isRoot": True,
@@ -521,7 +524,7 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
         self.row_json = {
             "name": "fake-name",
             "hostname": "fake-hostname",
-            "external_ids": ['map', [["ovn-bridge-mappings",
+            "other_config": ['map', [["ovn-bridge-mappings",
                                       "fake-phynet1:fake-br1"]]]
         }
         self._mock_hash_ring = mock.patch.object(
@@ -545,14 +548,18 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
         self.sb_idl.notify_handler.notify_loop()
 
     def test_chassis_create_event(self):
-        self._test_chassis_helper('create', self.row_json)
+        old_row_json = {'other_config': ['map', []]}
+        self._test_chassis_helper('create', self.row_json,
+                                  old_row_json=old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_called_once_with(
             'fake-hostname', ['fake-phynet1'])
         self.l3_plugin.schedule_unhosted_gateways.assert_called_once_with(
             event_from_chassis=None)
 
     def test_chassis_delete_event(self):
-        self._test_chassis_helper('delete', self.row_json)
+        old_row_json = {'other_config': ['map', []]}
+        self._test_chassis_helper('delete', self.row_json,
+                                  old_row_json=old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_called_once_with(
             'fake-hostname', [])
         self.l3_plugin.schedule_unhosted_gateways.assert_called_once_with(
@@ -560,7 +567,7 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
 
     def test_chassis_update_event(self):
         old_row_json = copy.deepcopy(self.row_json)
-        old_row_json['external_ids'][1][0][1] = (
+        old_row_json['other_config'][1][0][1] = (
             "fake-phynet2:fake-br2")
         self._test_chassis_helper('update', self.row_json, old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_called_once_with(
@@ -569,9 +576,9 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
             event_from_chassis=None)
 
     def test_chassis_update_event_reschedule_not_needed(self):
-        self.row_json['external_ids'][1].append(['foo_field', 'foo_value_new'])
+        self.row_json['other_config'][1].append(['foo_field', 'foo_value_new'])
         old_row_json = copy.deepcopy(self.row_json)
-        old_row_json['external_ids'][1][1][1] = (
+        old_row_json['other_config'][1][1][1] = (
             "foo_value")
         self._test_chassis_helper('update', self.row_json, old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_not_called()
@@ -579,14 +586,14 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
 
     def test_chassis_update_event_reschedule_lost_physnet(self):
         old_row_json = copy.deepcopy(self.row_json)
-        self.row_json['external_ids'][1][0][1] = ''
+        self.row_json['other_config'][1][0][1] = ''
         self._test_chassis_helper('update', self.row_json, old_row_json)
         self.l3_plugin.schedule_unhosted_gateways.assert_called_once_with(
             event_from_chassis='fake-name')
 
     def test_chassis_update_event_reschedule_add_physnet(self):
         old_row_json = copy.deepcopy(self.row_json)
-        self.row_json['external_ids'][1][0][1] += ',foo_physnet:foo_br'
+        self.row_json['other_config'][1][0][1] += ',foo_physnet:foo_br'
         self._test_chassis_helper('update', self.row_json, old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_called_once_with(
             'fake-hostname', ['fake-phynet1', 'foo_physnet'])
@@ -595,7 +602,7 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
 
     def test_chassis_update_event_reschedule_add_and_remove_physnet(self):
         old_row_json = copy.deepcopy(self.row_json)
-        self.row_json['external_ids'][1][0][1] = 'foo_physnet:foo_br'
+        self.row_json['other_config'][1][0][1] = 'foo_physnet:foo_br'
         self._test_chassis_helper('update', self.row_json, old_row_json)
         self.mech_driver.update_segment_host_mapping.assert_called_once_with(
             'fake-hostname', ['foo_physnet'])
@@ -604,7 +611,7 @@ class TestOvnSbIdlNotifyHandler(test_mech_driver.OVNMechanismDriverTestCase):
 
     def test_chassis_update_empty_no_external_ids(self):
         old_row_json = copy.deepcopy(self.row_json)
-        old_row_json.pop('external_ids')
+        old_row_json.pop('other_config')
         with mock.patch(
             'neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.'
             'ovsdb_monitor.ChassisEvent.'
@@ -637,10 +644,10 @@ class TestChassisEvent(base.BaseTestCase):
 
     def _test_handle_ha_chassis_group_changes_create(self, event):
         # Chassis
-        ext_ids = {
+        other_config = {
             'ovn-cms-options': 'enable-chassis-as-gw,availability-zones=az-0'}
         row = fakes.FakeOvsdbTable.create_one_ovsdb_table(
-            attrs={'name': 'SpongeBob', 'external_ids': ext_ids})
+            attrs={'name': 'SpongeBob', 'other_config': other_config})
         # HA Chassis
         ch0 = fakes.FakeOvsdbTable.create_one_ovsdb_table(
             attrs={'priority': 10})
@@ -672,10 +679,10 @@ class TestChassisEvent(base.BaseTestCase):
 
     def _test_handle_ha_chassis_group_changes_delete(self, event):
         # Chassis
-        ext_ids = {
+        other_config = {
             'ovn-cms-options': 'enable-chassis-as-gw,availability-zones=az-0'}
         row = fakes.FakeOvsdbTable.create_one_ovsdb_table(
-            attrs={'name': 'SpongeBob', 'external_ids': ext_ids})
+            attrs={'name': 'SpongeBob', 'other_config': other_config})
         # HA Chassis
         ha_ch = fakes.FakeOvsdbTable.create_one_ovsdb_table(
             attrs={'priority': 10})
@@ -699,10 +706,10 @@ class TestChassisEvent(base.BaseTestCase):
     def test_handle_ha_chassis_group_changes_update_no_changes(self):
         # Assert nothing was done because the update didn't
         # change the gateway chassis status or the availability zones
-        ext_ids = {
+        other_config = {
             'ovn-cms-options': 'enable-chassis-as-gw,availability-zones=az-0'}
         new = fakes.FakeOvsdbTable.create_one_ovsdb_table(
-            attrs={'name': 'SpongeBob', 'external_ids': ext_ids})
+            attrs={'name': 'SpongeBob', 'other_config': other_config})
         old = new
         self.assertIsNone(self.event.handle_ha_chassis_group_changes(
             self.event.ROW_UPDATE, new, old))
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 dd744bfed75..26837b03e4e 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
@@ -112,6 +112,7 @@ class MechDriverSetupBase(abc.ABC):
                 chassis_private.nb_cfg_timestamp, mock.Mock):
             del chassis_private.nb_cfg_timestamp
         chassis_private.external_ids = {}
+        chassis_private.other_config = {}
         if agent_type == ovn_const.OVN_METADATA_AGENT:
             chassis_private.external_ids.update({
                 ovn_const.OVN_AGENT_METADATA_SB_CFG_KEY: nb_cfg,
diff --git a/releasenotes/notes/ovn-chassis-other-config-7db15b9d10bf7f04.yaml b/releasenotes/notes/ovn-chassis-other-config-7db15b9d10bf7f04.yaml
new file mode 100644
index 00000000000..8123a03be6d
--- /dev/null
+++ b/releasenotes/notes/ovn-chassis-other-config-7db15b9d10bf7f04.yaml
@@ -0,0 +1,10 @@
+---
+other:
+  - |
+    Since OVN 20.06, the "Chassis" register configuration is stored in the
+    "other_config" field and replicated into "external_ids". This replication
+    is stopped in OVN 22.09. The ML2/OVN plugin tries to retrieve the "Chassis"
+    configuration from the "other_config" field first; if this field does not
+    exist (in OVN versions before 20.06), the plugin will use "external_ids"
+    field instead. Neutron will be compatible with the different OVN versions
+    (with and without "other_config" field).