Comment 1 for bug 1994158

This looks like the result of a change in the 20.2.0 version for Yoga. Specifically, bug #1958501 was fixed to cause Neutron to not bind the port to a dead agent in the OVN case. It was fixed in Zed release and backported to yoga/stable in https://review.opendev.org/c/openstack/neutron/+/844494.

In this case, the agent is not determined to be alive for solqa-lab1-server-35.nosilo.lab1.solutionsqa

neutron-api-plugin-ovn_1/var/log/neutron/neutron-server.log
--------------------
2022-10-25 12:12:36.952 192922 ERROR neutron.plugins.ml2.managers [req-ef882b1c-f715-41fa-89d9-fd029f38576f a12a96846bce4d16af50a3389e87a7e9 a0c0be4aa6a3407d9b695dae6ee1861f - 58f5e7f1a82c452e8affaa6b14c7b
d00 58f5e7f1a82c452e8affaa6b14c7bd00] Failed to bind port ab1a4b97-b704-462f-a767-f4319ab1f278 on host solqa-lab1-server-35.nosilo.lab1.solutionsqa for vnic_type normal using segments [{'id': '898f8692-fdb
0-46b3-8388-8a007efbac46', 'network_type': 'geneve', 'physical_network': None, 'segmentation_id': 1376, 'network_id': 'de98a060-d23a-4520-bba1-3b6092008b6f'}]
2022-10-25 12:12:36.953 192922 INFO neutron.plugins.ml2.plugin [req-ef882b1c-f715-41fa-89d9-fd029f38576f a12a96846bce4d16af50a3389e87a7e9 a0c0be4aa6a3407d9b695dae6ee1861f - 58f5e7f1a82c452e8affaa6b14c7bd00
 58f5e7f1a82c452e8affaa6b14c7bd00] Attempt 6 to bind port ab1a4b97-b704-462f-a767-f4319ab1f278
2022-10-25 12:12:36.970 192922 WARNING neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver [req-ef882b1c-f715-41fa-89d9-fd029f38576f a12a96846bce4d16af50a3389e87a7e9 a0c0be4aa6a3407d9b695dae6ee1861f - 58f5e7f1a82c452e8affaa6b14c7bd00 58f5e7f1a82c452e8affaa6b14c7bd00] Refusing to bind port ab1a4b97-b704-462f-a767-f4319ab1f278 to dead agent: <neutron.plugins.ml2.drivers.ovn.agent.neutron_agent.ControllerAgent object at 0x7fdff23a26d0>