diff --git a/neutron_tempest_plugin/api/base.py b/neutron_tempest_plugin/api/base.py
index 4bcc6d2..178bf99 100644
--- a/neutron_tempest_plugin/api/base.py
+++ b/neutron_tempest_plugin/api/base.py
@@ -18,6 +18,7 @@
 import time
 
 import netaddr
+from neutron_lib._i18n import _
 from neutron_lib import constants as const
 from oslo_log import log
 from tempest.common import utils as tutils
@@ -492,7 +493,7 @@
             if ip_version:
                 if ip_version != gateway_ip.version:
                     raise ValueError(
-                        "Gateway IP version doesn't match IP version")
+                        _("Gateway IP version doesn't match IP version"))
             else:
                 ip_version = gateway_ip.version
         else:
@@ -541,8 +542,8 @@
         """
 
         if not cls.try_reserve_subnet_cidr(addr, **ipnetwork_kwargs):
-            raise ValueError('Subnet CIDR already reserved: {0!r}'.format(
-                addr))
+            raise ValueError(_('Subnet CIDR already reserved: {0!r}'.format(
+                addr)))
 
     @classmethod
     def try_reserve_subnet_cidr(cls, addr, **ipnetwork_kwargs):
@@ -601,7 +602,8 @@
                 mask_bits = CONF.network.project_network_v6_mask_bits
                 cidr = netaddr.IPNetwork(CONF.network.project_network_v6_cidr)
             else:
-                raise ValueError('Invalid IP version: {!r}'.format(ip_version))
+                raise ValueError(_(
+                    'Invalid IP version: {!r}'.format(ip_version)))
 
         if mask_bits:
             subnet_cidrs = cidr.subnet(mask_bits)
@@ -687,8 +689,9 @@
         if port:
             port_id = kwargs.setdefault('port_id', port['id'])
             if port_id != port['id']:
-                message = "Port ID specified twice: {!s} != {!s}".format(
-                    port_id, port['id'])
+                message = _(
+                    "Port ID specified twice: {!s} != {!s}".format(
+                        port_id, port['id']))
                 raise ValueError(message)
 
         fip = client.create_floatingip(external_network_id,
@@ -985,7 +988,7 @@
             project_id = kwargs.setdefault('project_id', project['id'])
             tenant_id = kwargs.setdefault('tenant_id', project['id'])
             if project_id != project['id'] or tenant_id != project['id']:
-                raise ValueError('Project ID specified multiple times')
+                raise ValueError(_('Project ID specified multiple times'))
         else:
             client = client or cls.client
 
@@ -1008,7 +1011,7 @@
         for security_group in security_groups:
             if security_group['name'] == name:
                 return security_group
-        raise ValueError("No such security group named {!r}".format(name))
+        raise ValueError(_("No such security group named {!r}".format(name)))
 
     @classmethod
     def create_security_group_rule(cls, security_group=None, project=None,
@@ -1018,7 +1021,7 @@
             project_id = kwargs.setdefault('project_id', project['id'])
             tenant_id = kwargs.setdefault('tenant_id', project['id'])
             if project_id != project['id'] or tenant_id != project['id']:
-                raise ValueError('Project ID specified multiple times')
+                raise ValueError(_('Project ID specified multiple times'))
 
         if 'security_group_id' not in kwargs:
             security_group = (security_group or
@@ -1029,7 +1032,8 @@
             security_group_id = kwargs.setdefault('security_group_id',
                                                   security_group['id'])
             if security_group_id != security_group['id']:
-                raise ValueError('Security group ID specified multiple times.')
+                raise ValueError(
+                    _('Security group ID specified multiple times.'))
 
         ip_version = ip_version or cls._ip_version
         default_params = (
diff --git a/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py b/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
index 9cca602..c9f4bcc 100644
--- a/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
+++ b/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
@@ -17,6 +17,7 @@
 import random
 
 import netaddr
+from neutron_lib._i18n import _
 from neutron_lib.utils import test
 from oslo_concurrency import lockutils
 from oslo_log import log as logging
@@ -42,8 +43,8 @@
 if "SUBNETPOOL_PREFIX_V4" in os.environ:
     subnet_base = netaddr.IPNetwork(os.environ['SUBNETPOOL_PREFIX_V4'])
     if subnet_base.prefixlen > 21:
-        raise Exception("if SUBNETPOOL_PREFIX_V4 is set, it needs to offer "
-                        "space for at least 8 /24 subnets")
+        raise Exception(_("if SUBNETPOOL_PREFIX_V4 is set, it needs to offer "
+                          "space for at least 8 /24 subnets"))
 else:
     subnet_base = netaddr.IPNetwork("10.100.0.0/16")
 
diff --git a/neutron_tempest_plugin/common/ip.py b/neutron_tempest_plugin/common/ip.py
index e87219b..bab9064 100644
--- a/neutron_tempest_plugin/common/ip.py
+++ b/neutron_tempest_plugin/common/ip.py
@@ -19,6 +19,7 @@
 import subprocess
 
 import netaddr
+from neutron_lib._i18n import _
 from neutron_lib import constants
 from oslo_log import log
 from oslo_utils import excutils
@@ -89,9 +90,9 @@
             for ip, prefix_len in _get_ip_address_prefix_len_pairs(
                 port=subport, subnets=subnets)]
         if not subport_ips:
-            raise ValueError(
+            raise ValueError(_(
                 "Unable to get IP address and subnet prefix lengths for "
-                "subport")
+                "subport"))
 
         return self.configure_vlan(addresses, port, vlan_tag, subport_ips,
                                    subport['mac_address'])
@@ -353,7 +354,7 @@
     for address in list_ip_addresses(addresses=addresses, port=port):
         return address.device.name
 
-    msg = "Port {0!r} fixed IPs not found on server.".format(port['id'])
+    msg = _("Port {0!r} fixed IPs not found on server.".format(port['id']))
     raise ValueError(msg)
 
 
@@ -362,7 +363,8 @@
             ip_addresses=ip_addresses):
         return address.device.name
 
-    msg = "Fixed IPs {0!r} not found on server.".format(' '.join(ip_addresses))
+    msg = _(
+        "Fixed IPs {0!r} not found on server.".format(' '.join(ip_addresses)))
     raise ValueError(msg)
 
 
diff --git a/neutron_tempest_plugin/common/ssh.py b/neutron_tempest_plugin/common/ssh.py
index 6e7e2c5..b0dd9c1 100644
--- a/neutron_tempest_plugin/common/ssh.py
+++ b/neutron_tempest_plugin/common/ssh.py
@@ -17,6 +17,7 @@
 import socket
 import time
 
+from neutron_lib._i18n import _
 from oslo_log import log
 import paramiko
 from tempest.lib.common import ssh
@@ -70,8 +71,8 @@
         host = cls.proxy_jump_host
         if not host:
             # proxy_jump_host string cannot be empty or None
-            raise ValueError(
-                "'proxy_jump_host' configuration option is empty.")
+            raise ValueError(_(
+                "'proxy_jump_host' configuration option is empty."))
 
         # Let accept an empty string as a synonymous of default value on below
         # options
@@ -82,9 +83,9 @@
         # Port must be a positive integer
         port = cls.proxy_jump_port
         if port <= 0 or port > 65535:
-            raise ValueError(
+            raise ValueError(_(
                 "Invalid value for 'proxy_jump_port' configuration option: "
-                "{!r}".format(port))
+                "{!r}".format(port)))
 
         login = "{username}@{host}:{port}".format(username=username, host=host,
                                                   port=port)
@@ -99,9 +100,9 @@
             else:
                 # This message could help the user to identify a
                 # mis-configuration in tempest.conf
-                raise ValueError(
+                raise ValueError(_(
                     "Cannot find file specified as 'proxy_jump_keyfile' "
-                    "option: {!r}".format(key_file))
+                    "option: {!r}".format(key_file)))
 
         elif password:
             LOG.debug("Going to create SSH connection to %r using password.",
diff --git a/neutron_tempest_plugin/common/utils.py b/neutron_tempest_plugin/common/utils.py
index 62191bf..4ae374e 100644
--- a/neutron_tempest_plugin/common/utils.py
+++ b/neutron_tempest_plugin/common/utils.py
@@ -26,7 +26,7 @@
     from urllib import parse as urlparse
 
 import eventlet
-
+from neutron_lib._i18n import _
 from oslo_log import log
 from tempest.lib import exceptions
 
@@ -87,7 +87,7 @@
         if exception is not None:
             # pylint: disable=raising-bad-type
             raise exception
-        raise WaitTimeout("Timed out after %d seconds" % timeout)
+        raise WaitTimeout(_("Timed out after %d seconds" % timeout))
 
 
 def override_class(overriden_class, overrider_class):
diff --git a/neutron_tempest_plugin/scenario/base.py b/neutron_tempest_plugin/scenario/base.py
index d299c47..f7d08eb 100644
--- a/neutron_tempest_plugin/scenario/base.py
+++ b/neutron_tempest_plugin/scenario/base.py
@@ -18,6 +18,7 @@
 
 from debtcollector import removals
 import netaddr
+from neutron_lib._i18n import _
 from neutron_lib.api import validators
 from neutron_lib import constants as neutron_lib_constants
 from oslo_log import log
@@ -680,8 +681,8 @@
             router = client.update_router(router['id'], **kwargs)['router']
             return router
         else:
-            raise Exception("Neither of 'public_router_id' or "
-                            "'public_network_id' has been defined.")
+            raise Exception(_("Neither of 'public_router_id' or "
+                              "'public_network_id' has been defined."))
 
     def _update_router_admin_state(self, router, admin_state_up):
         kwargs = dict(admin_state_up=admin_state_up)
diff --git a/neutron_tempest_plugin/scenario/test_multiple_gws.py b/neutron_tempest_plugin/scenario/test_multiple_gws.py
index e4f1d3d..51d047a 100644
--- a/neutron_tempest_plugin/scenario/test_multiple_gws.py
+++ b/neutron_tempest_plugin/scenario/test_multiple_gws.py
@@ -12,7 +12,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import json
+
 import os
 import subprocess
 import time
@@ -29,6 +29,7 @@
 from neutron_lib import constants as const
 
 from oslo_log import log
+from oslo_serialization import jsonutils
 
 from os_ken.tests.integrated.common import docker_base as ctn_base
 
@@ -288,7 +289,7 @@
         )
 
     def show_bfd_peer(self, peer: str) -> typing.Dict[str, typing.Any]:
-        return json.loads(self.vtysh([f'show bfd peer {peer} json']))
+        return jsonutils.loads(self.vtysh([f'show bfd peer {peer} json']))
 
     def wait_for_bfd_peer_status(
         self, peer: str, status: str, try_times=30, interval=1
diff --git a/neutron_tempest_plugin/services/network/json/network_client.py b/neutron_tempest_plugin/services/network/json/network_client.py
index 289ef61..f5583f2 100644
--- a/neutron_tempest_plugin/services/network/json/network_client.py
+++ b/neutron_tempest_plugin/services/network/json/network_client.py
@@ -13,6 +13,7 @@
 import time
 from urllib import parse as urlparse
 
+from neutron_lib._i18n import _
 from oslo_serialization import jsonutils
 from tempest.lib.common import rest_client as service_client
 from tempest.lib import exceptions as lib_exc
@@ -304,7 +305,7 @@
         try:
             getattr(self, method)(id)
         except AttributeError:
-            raise Exception("Unknown resource type %s " % resource_type)
+            raise Exception(_("Unknown resource type %s " % resource_type))
         except lib_exc.NotFound:
             return True
         return False
diff --git a/tox.ini b/tox.ini
index 21574f4..e209d58 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,8 +62,9 @@
 # E129 visually indented line with same indent as next logical line
 # I202 Additional newline in a group of imports.
 # N530 direct neutron imports not allowed
+# N535 prevent eventlet library import
 # W504 line break after binary operator
-ignore = E126,E128,E129,I202,N530,W504
+ignore = E126,E128,E129,I202,N530,N535,W504
 # H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 # H204: Use assert(Not)Equal to check for equality