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diff --git a/neutron/exceptions/mtu.py b/neutron/exceptions/mtu.py
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+# Copyright (c) 2023 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from neutron_lib import exceptions as e
+
+from neutron._i18n import _
+
+
+# TODO(haleyb): Move to n-lib
+class NetworkMTUSubnetConflict(e.Conflict):
+ """A conflict error due to MTU being invalid on said network.
+
+ :param net_id: The UUID of the network
+ :param mtu: The minimum MTU required by a subnet for the network
+ """
+ message = _("MTU of %(net_id)s is not valid, subnet requires a "
+ "minimum of %(mtu)s")