OVN router flavors create OVN router on Neutron restart

[Doug Goldstein]

When I create a router using the UserDefined and then restart Neutron, it will create the router in OVN.

2025-05-05 22:20:37.643 16 WARNING neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync [None req-75c6e768-3842-45e0-9ec5-4cf3d6aca434 - - - - - -] Router found in Neutron but not in OVN NB DB, router id=87e0e66b-c720-41b2-bd8e-09d00c3563d3
2025-05-05 22:20:37.643 16 WARNING neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync [None req-75c6e768-3842-45e0-9ec5-4cf3d6aca434 - - - - - -] Creating the router 87e0e66b-c720-41b2-bd8e-09d00c3563d3 in OVN NB DB

my neutron.conf has the following:

[ovn]
neutron_sync_mode = repair

[Miro Tomaska (mtomaska)]

Confirmed on master branch deployed with devstack

- Setup the mock UserDefined router flavor as per [1]
- Set in ml2_conf.ini
[ovn]
neutron_sync_mode = repair
- restart neutron server

check `ovn-nbctl list Logical_Router` entry was created. In my case uuid of my mock flavor router was `neutron-64476970-b7ea-4e40-a5e6-fdbef69deb48`

_uuid : 0f06bd54-40a7-432c-8c8d-685d291f86a7
copp : []
enabled : true
external_ids : {"neutron:availability_zone_hints"="", "neutron:revision_number"="1", "neutron:router_name"=f_router}
load_balancer : []
load_balancer_group : []
name : neutron-64476970-b7ea-4e40-a5e6-fdbef69deb48
nat : []
options : {always_learn_from_arp_request="false", dynamic_neigh_routers="true", mac_binding_age_threshold="0"}
policies : []
ports : []
static_routes : []

[1] https://docs.openstack.org/neutron/latest/admin/config-router-flavor-ovn.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/949816

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/949816
Committed: https://opendev.org/openstack/neutron/commit/a37c2d2a1e27266f51259b33c5b2720f41f00b71
Submitter: "Zuul (22348)"
Branch: master

commit a37c2d2a1e27266f51259b33c5b2720f41f00b71
Author: Miguel Lavalle <email address hidden>
Date: Wed May 14 19:13:42 2025 -0500

    Fix ovn_db_sync for user defined flavor routers

    When ovn_db_sync is executed in repair mode after a Neutron server
    restart, it erronously adds user defined flavor routers to the OVN NBDB.
    Those routers are not managed by OVN. Hereby the issue if fixed.

    Change-Id: Iacd78020ee41399c3a8ce6cfdf9e37c4f865c90e
    Closes-Bug: #2110060

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/2025.1
Review: https://review.opendev.org/c/openstack/neutron/+/950239

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/2024.2
Review: https://review.opendev.org/c/openstack/neutron/+/950240

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/2024.1
Review: https://review.opendev.org/c/openstack/neutron/+/950241

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/950239
Committed: https://opendev.org/openstack/neutron/commit/00130dc806accd77b0510d332e539dc2fc086781
Submitter: "Zuul (22348)"
Branch: stable/2025.1

commit 00130dc806accd77b0510d332e539dc2fc086781
Author: Miguel Lavalle <email address hidden>
Date: Wed May 14 19:13:42 2025 -0500

    Fix ovn_db_sync for user defined flavor routers

    When ovn_db_sync is executed in repair mode after a Neutron server
    restart, it erronously adds user defined flavor routers to the OVN NBDB.
    Those routers are not managed by OVN. Hereby the issue if fixed.

    Change-Id: Iacd78020ee41399c3a8ce6cfdf9e37c4f865c90e
    Closes-Bug: #2110060
    (cherry picked from commit a37c2d2a1e27266f51259b33c5b2720f41f00b71)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/950240
Committed: https://opendev.org/openstack/neutron/commit/9b4b23ac3a8a7a6e84cfb0ef9f8c732159a4c5e5
Submitter: "Zuul (22348)"
Branch: stable/2024.2

commit 9b4b23ac3a8a7a6e84cfb0ef9f8c732159a4c5e5
Author: Miguel Lavalle <email address hidden>
Date: Wed May 14 19:13:42 2025 -0500

    Fix ovn_db_sync for user defined flavor routers

    When ovn_db_sync is executed in repair mode after a Neutron server
    restart, it erronously adds user defined flavor routers to the OVN NBDB.
    Those routers are not managed by OVN. Hereby the issue if fixed.

    Change-Id: Iacd78020ee41399c3a8ce6cfdf9e37c4f865c90e
    Closes-Bug: #2110060
    (cherry picked from commit a37c2d2a1e27266f51259b33c5b2720f41f00b71)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/950241
Committed: https://opendev.org/openstack/neutron/commit/b20dcbfcfc0836e756a244bded55984402df4674
Submitter: "Zuul (22348)"
Branch: stable/2024.1

commit b20dcbfcfc0836e756a244bded55984402df4674
Author: Miguel Lavalle <email address hidden>
Date: Wed May 14 19:13:42 2025 -0500

    Fix ovn_db_sync for user defined flavor routers

    When ovn_db_sync is executed in repair mode after a Neutron server
    restart, it erronously adds user defined flavor routers to the OVN NBDB.
    Those routers are not managed by OVN. Hereby the issue if fixed.

    Change-Id: Iacd78020ee41399c3a8ce6cfdf9e37c4f865c90e
    Closes-Bug: #2110060
    (cherry picked from commit a37c2d2a1e27266f51259b33c5b2720f41f00b71)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 25.2.0 Dalmatian release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 24.2.0 Caracal release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 26.0.1 Epoxy release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 27.0.0.0b1 Flamingo development milestone.