Ubuntu Cloud Archive

Neutron-dynamic-routing does not work with OVN

Bug #1959666 reported by Dr. Jens Harbott on 2022-02-01

This bug affects 8 people

	Status	Importance	Assigned to
OpenStack Neutron API OVN Plugin Charm	Fix Committed	Undecided	Unassigned
OpenStack Neutron Dynamic Routing charm	In Progress	Undecided	Unassigned
Ubuntu Cloud Archive	New	Undecided	Unassigned
neutron	Fix Released	Undecided	Unassigned

Bug Description

When using OVN as Neutron backend, announcing prefixes with neutron-dynamic-routing is currently not working due to changes in the database structure. Some attempt to fix this has been made in https://review.opendev.org/c/openstack/neutron-dynamic-routing/+/814055 but wasn't successful.

This is a major stop gap for production deployments which are using BGP to provide connectivity for IPv6 subnets in tenant networks.

Tags:

Lajos Katona (lajos-katona) on 2022-02-02

Changed in neutron:
status:	New → Confirmed

Revision history for this message

Dmitrii Shcherbakov (dmitriis) wrote on 2023-06-20:

I believe this issue was addressed in https://review.opendev.org/c/openstack/neutron/+/864051.

However, there are some other considerations around distributed floating IPs with OVN and the extra router attributes in the context of OVN routers relevant to NDR: https://bugs.launchpad.net/neutron/+bug/2022058

Revision history for this message

Dr. Jens Harbott (j-harbott) wrote on 2023-06-20:

Ack, OVN+NDR is working in general now, some specific use case may still need additional work.

Changed in neutron:
status:	Confirmed → Fix Released

Revision history for this message

Dmitrii Shcherbakov (dmitriis) wrote on 2023-06-20 (last edit on 2023-06-20):

When it comes to the NDR charm we enabled it in the charms (neutron-api-plugin-ovn specifically needed a code change) documenting those limitations in the charm-guide.

https://review.opendev.org/q/topic:2023-enable-ndr
https://review.opendev.org/q/topic:2023-ovn-ndr

Also we are adding some data plane testing to make sure that the advertised routes are actually possible to reach.

https://review.opendev.org/c/openstack/charm-neutron-dynamic-routing/+/886157