FDB entries grows indefinitely

[Luis Tomas]

With the added support for learning FDB entries [1] there is a problem that FDB table can grow indefinitely, leading to performance/scale issues. New options are added to OVN [2] to tackle this problem, and neutron should make use of it

[1] https://review.opendev.org/c/openstack/neutron/+/877675
[2] https://github.com/ovn-org/ovn/commit/ae9a5488824c49e25215b02e7e81a62eb4d0bd53

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/893333
Committed: https://opendev.org/openstack/neutron/commit/1e9f50c73638171403b71d742321464dcd5ef7ed
Submitter: "Zuul (22348)"
Branch: master

commit 1e9f50c73638171403b71d742321464dcd5ef7ed
Author: Luis Tomas Bolivar <email address hidden>
Date: Fri Sep 8 10:40:32 2023 +0200

    Add support for FDB aging

    In [1] we added support for FDB learning. In order to avoid issues
    due to that table increasing without limits, which will impact OVN
    performance, this patch is adding support for its aging mechanisms
    which was added in OVN 23.09 in [2]. By default is disabled, so if
    `localnet_learn_fdb` is enabled, the new configuration parameters
    should be appropriately configured too: `fdb_age_threshold` and
    `fdb_removal_limit`

    [1] https://review.opendev.org/c/openstack/neutron/+/877675
    [2] https://github.com/ovn-org/ovn/commit/ae9a5488824c49e25215b02e7e81a62eb4d0bd53

    Closes-Bug: 2035325

    Change-Id: Ifdfaec35cc6b52040487a2b5ee08aba9282fc68b

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 24.0.0.0b1 development milestone.