When ovs-agent is restarted flows creatd by other than ovs-agent are deleted.

[SUZUKI, Kazuhiro]

When ovs-agent is restarted, the cleanup logic drops flow entries unless they are stamped by agent_uuid (recorded as a cookie).

Referene: https://git.openstack.org/cgit/openstack/neutron/commit/?id=73673beacd75a2d9f51f15b284f1b458d32e992e

Not only old flows, but also flows created by other than ovs-agent (flows without a stamp) are deleted.

Version: Liberty

[Eugene Nikanorov (enikanorov)]

That is current as-designed behavior.
I'd be interested in knowing proposed solution for this issue.

[SUZUKI, Kazuhiro (kaz-kaz)]

I've posted a patch to solve this issue.
https://review.openstack.org/#/c/257285/

[OpenStack Infra (hudson-openstack)]

Change abandoned by Kazuhiro Suzuki (<email address hidden>) on branch: master
Review: https://review.openstack.org/257286
Reason: L2 agent extension api is available.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Armando Migliaccio (<email address hidden>) on branch: master
Review: https://review.openstack.org/257285
Reason: This review is > 4 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.

[Armando Migliaccio (armando-migliaccio)]

Addressed by: https://review.openstack.org/#/c/267591/

[Miguel Angel Ajo (mangelajo)]

Yes, tap as a service may need to be implemented as an OVS agent extension, and make use of the API @armax referenced.

[YAMAMOTO Takashi (yamamoto)]

https://review.openstack.org/#/c/480031/