diff --git a/config.yaml b/config.yaml
index b26759a5..4a80eda3 100644
--- a/config.yaml
+++ b/config.yaml
@@ -48,6 +48,11 @@ options:
     type: string
     default: ext_net
     description: Name of the external network for floating IP addresses provided by Neutron.
+  network-device-mtu:
+    type: int
+    default: 1500
+    description: |
+      The MTU size for the interfaces managed by neutron.
   neutron-plugin:
     default: ovs
     type: string
diff --git a/hooks/neutron_api_hooks.py b/hooks/neutron_api_hooks.py
index 8e3cc5ab..ef16e5e4 100755
--- a/hooks/neutron_api_hooks.py
+++ b/hooks/neutron_api_hooks.py
@@ -278,6 +278,7 @@ def neutron_plugin_api_relation_joined(rid=None):
             'neutron-security-groups': config('neutron-security-groups'),
             'l2-population': get_l2population(),
             'overlay-network-type': get_overlay_network_type(),
+            'network-device-mtu': config('network-device-mtu'),
         }
     relation_set(relation_id=rid, **relation_data)
 
diff --git a/unit_tests/test_neutron_api_hooks.py b/unit_tests/test_neutron_api_hooks.py
index 747d66a0..11477cd2 100644
--- a/unit_tests/test_neutron_api_hooks.py
+++ b/unit_tests/test_neutron_api_hooks.py
@@ -276,6 +276,7 @@ class NeutronAPIHooksTests(CharmTestCase):
             'neutron-security-groups': False,
             'l2-population': False,
             'overlay-network-type': 'vxlan',
+            'network-device-mtu': 1500,
         }
         self.get_l2population.return_value = False
         self.get_overlay_network_type.return_value = 'vxlan'