diff --git a/kayobe/plugins/action/kolla_ansible_host_vars.py b/kayobe/plugins/action/kolla_ansible_host_vars.py
index d03aac6aa..2a442b760 100644
--- a/kayobe/plugins/action/kolla_ansible_host_vars.py
+++ b/kayobe/plugins/action/kolla_ansible_host_vars.py
@@ -154,7 +154,10 @@ class ActionModule(ActionBase):
             # For a bridge, use a veth pair connected to the bridge. Otherwise
             # use the interface directly.
             if is_bridge:
-                external_interface = patch_prefix + interface + patch_suffix
+                # interface names can't be longer than 15 characters
+                char_limit = 15 - len(patch_prefix) - len(patch_suffix)
+                external_interface = patch_prefix + interface[:char_limit] + \
+                    patch_suffix
             else:
                 external_interface = interface
             neutron_external_interfaces.append(external_interface)
diff --git a/kayobe/plugins/filter/networks.py b/kayobe/plugins/filter/networks.py
index bbcd74407..1d54a8c7b 100644
--- a/kayobe/plugins/filter/networks.py
+++ b/kayobe/plugins/filter/networks.py
@@ -49,7 +49,10 @@ def _get_veth_interface(context, bridge, inventory_hostname):
                                inventory_hostname)
     suffix = utils.get_hostvar(context, 'network_patch_suffix_phy',
                                inventory_hostname)
-    return prefix + bridge + suffix
+
+    # interface names can't be longer than 15 characters
+    char_limit = 15 - len(prefix) - len(suffix)
+    return prefix + bridge[:char_limit] + suffix
 
 
 def _get_veth_peer(context, bridge, inventory_hostname):
@@ -64,7 +67,10 @@ def _get_veth_peer(context, bridge, inventory_hostname):
                                inventory_hostname)
     suffix = utils.get_hostvar(context, 'network_patch_suffix_ovs',
                                inventory_hostname)
-    return prefix + bridge + suffix
+
+    # interface names can't be longer than 15 characters
+    char_limit = 15 - len(prefix) - len(suffix)
+    return prefix + bridge[:char_limit] + suffix
 
 
 def get_ovs_veths(context, names, inventory_hostname):