Public bug reported:
After upgrade from Antelope to Caracal, we have encountered situation
where creating external interfaces on virtual routers times out (with
default gateway 504 timeout message). Environment uses Openstack-helm
for deployment and configuration. In this environment OVN is used to
manage network and all hypervisors are used as default gateways. This
behaviour is exhibited when creating new routers with external network
attached, or when setting default gateway on exiting routers; routers
that are already existing and working have no issues until there is same
operation performed on them.
Component versions:
- neutron-server 24.2.1
- ovn-nbctl 24.03.2
Open vSwitch Library 3.3.0
DB Schema 7.3.0
- ovn-sbctl 24.03.2
Open vSwitch Library 3.3.0
DB Schema 20.33.0
- ovs-appctl --version
ovs-appctl (Open vSwitch) 3.3.0
Example of log output when setting gateway with public interface (external) on
router:
```
neutron neutron-server-f97c45dd9-zrlz2 neutron-server 2025-10-03 08: 14: 22.870
23
ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance
ovsdbapp.exceptions.TimeoutException:
Commands
[CheckRevisionNumberCommand(
_result=None,
name=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
resource={'id': 'd4a62806-aa42-4e32-83bd-0732a4421d93',
.
.
.
.
AddStaticRouteCommand(
_result=None,
lrouter=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
maintain_bfd=False,
columns={'ip_prefix': '0.0.0.0/0',
'nexthop': ‘10.10.10.1’,
'external_ids': {'neutron:is_ext_gw': 'true',
'neutron:subnet_id':
'f3f06819-77f8-400b-ab78-b1436135fcc8'}}),
UpdateLRouterCommand(_result=None,
name=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
columns={'external_ids': {'neutron:router_name': 'lrt',
'neutron:revision_number': '3',
'neutron:availability_zone_hints': 'nova'},
'enabled': True},
if_exists=True),
QoSDelCommand(
_result=None,
switch=neutron-4ee098c1-82aa-4a43-923f-8e3dcb07971b,
conditions=[('direction', '=', 'from-lport'),
('priority', '=', 2002),
('match', '=', 'inport ==
"10ccb139-a5ce-49aa-aacb-685ea73fa2e7"')],
if_exists=True),
QoSDelCommand(
_result=None,
switch=neutron-4ee098c1-82aa-4a43-923f-8e3dcb07971b,
conditions=[('direction', '=', 'to-lport'),
('priority', '=', 2002),
('match', '=', 'outport ==
"10ccb139-a5ce-49aa-aacb-685ea73fa2e7"')],
if_exists=True)]
exceeded timeout 180 seconds, cause: Result queue is empty
```
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2126913
Title:
Neutron not able to create external ports for virtual routers
Status in neutron:
New
Bug description:
After upgrade from Antelope to Caracal, we have encountered situation
where creating external interfaces on virtual routers times out (with
default gateway 504 timeout message). Environment uses Openstack-helm
for deployment and configuration. In this environment OVN is used to
manage network and all hypervisors are used as default gateways. This
behaviour is exhibited when creating new routers with external network
attached, or when setting default gateway on exiting routers; routers
that are already existing and working have no issues until there is
same operation performed on them.
Component versions:
- neutron-server 24.2.1
- ovn-nbctl 24.03.2
Open vSwitch Library 3.3.0
DB Schema 7.3.0
- ovn-sbctl 24.03.2
Open vSwitch Library 3.3.0
DB Schema 20.33.0
- ovs-appctl --version
ovs-appctl (Open vSwitch) 3.3.0
Example of log output when setting gateway with public interface (external)
on router:
```
neutron neutron-server-f97c45dd9-zrlz2 neutron-server 2025-10-03 08: 14:
22.870 23
ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance
ovsdbapp.exceptions.TimeoutException:
Commands
[CheckRevisionNumberCommand(
_result=None,
name=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
resource={'id': 'd4a62806-aa42-4e32-83bd-0732a4421d93',
.
.
.
.
AddStaticRouteCommand(
_result=None,
lrouter=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
maintain_bfd=False,
columns={'ip_prefix': '0.0.0.0/0',
'nexthop': ‘10.10.10.1’,
'external_ids': {'neutron:is_ext_gw': 'true',
'neutron:subnet_id':
'f3f06819-77f8-400b-ab78-b1436135fcc8'}}),
UpdateLRouterCommand(_result=None,
name=neutron-d4a62806-aa42-4e32-83bd-0732a4421d93,
columns={'external_ids': {'neutron:router_name': 'lrt',
'neutron:revision_number':
'3',
'neutron:availability_zone_hints': 'nova'},
'enabled': True},
if_exists=True),
QoSDelCommand(
_result=None,
switch=neutron-4ee098c1-82aa-4a43-923f-8e3dcb07971b,
conditions=[('direction', '=', 'from-lport'),
('priority', '=', 2002),
('match', '=', 'inport ==
"10ccb139-a5ce-49aa-aacb-685ea73fa2e7"')],
if_exists=True),
QoSDelCommand(
_result=None,
switch=neutron-4ee098c1-82aa-4a43-923f-8e3dcb07971b,
conditions=[('direction', '=', 'to-lport'),
('priority', '=', 2002),
('match', '=', 'outport ==
"10ccb139-a5ce-49aa-aacb-685ea73fa2e7"')],
if_exists=True)]
exceeded timeout 180 seconds, cause: Result queue is empty
```
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