Cu lost connectivity to all VMs and from neutron-server logs it seems lost ovsdb since nothing is listening on 6642.expected ovsdb to be listening on 6642.

+++
2025-06-15 04:00:21.123 7 INFO neutron.plugins.ml2.managers [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Initializing mechanism driver 'ovn'
2025-06-15 04:00:21.123 7 INFO neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Starting OVNMechanismDriver
2025-06-15 04:00:21.125 7 ERROR ovsdbapp.backend.ovs_idl.idlutils [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Unable to open stream to tcp:192.168.20.23:6642 to retrieve schema: Connection refused
2025-06-15 04:00:21.126 7 ERROR ovsdbapp.backend.ovs_idl.idlutils [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Unable to open stream to tcp:192.168.20.14:6642 to retrieve schema: Connection refused
2025-06-15 04:00:21.127 7 ERROR ovsdbapp.backend.ovs_idl.idlutils [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Unable to open stream to tcp:192.168.20.24:6642 to retrieve schema: Connection refused
2025-06-15 04:00:21.127 7 ERROR neutron.service [req-d8f1bc4e-77fe-42e5-aadf-362856e7f83f - - - - -] Unrecoverable error: please check log for details.: Exception: Could not retrieve schema from tcp:192.168.20.23:6642,tcp:192.168.20.14:6642,tcp:192.168.20.24:6642
2025-06-15 04:00:21.127 7 ERROR neutron.service Traceback (most recent call last):
2025-06-15 04:00:21.127 7 ERROR neutron.service File "/usr/lib/python3.9/site-packages/neutron/service.py", line 88, in serve_wsgi
2025-06-15 04:00:21.127 7 ERROR neutron.service service.start()

grep 6642 0100-sosreport-oscar22ctr001-04170571-2025-06-15-gjfllfj.tar.xz/sosreport-oscar22ctr001-04170571-2025-06-15-gjfllfj/sos_commands/networking/netstat_-W_-neopa
+++

As far as ovn-migation is considered it failed because one of the node is faulty.

+++

2025-06-15 02:57:42,878 p=60025 u=stack n=ansible | fatal: [localhost]: FAILED! => {"changed": true, "cmd": "bash -eo pipefail /home/stack/common_templates/overcloud-deploy-ovn.sh 2>&1 > /home/stack/common_templates/overcloud-deploy-ovn.sh.log\n", "delta": "1:06:33.320598", "end": "2025-06-15 02:57:42.838850", "msg": "non-zero return code", "rc": 1, "start": "2025-06-15 01:51:09.518252", "stderr": "", "stderr_lines": [], "stdout": "/usr/lib/python3.9/site-packages/heatclient/common/template_utils.py:206: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working\n if isinstance(v, collections.Mapping):\nHost oscar22.tc.corp not found in /home/stack/.ssh/known_hosts", "stdout_lines": ["/usr/lib/python3.9/site-pa
ckages/heatclient/common/template_utils.py:206: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working", " if isinstance(v, collections.Mapping):", "Host oscar22.tc.corp not found in /home/stack/.ssh/known_hosts"]}

C[0;32m2025-06-15 04:14:02.414462 | 9440c987-a400-6181-5218-000000000034 | OK | Wait for connection to become available | 192.168.2.8ESC[0m
ESC[1;30m2025-06-15 04:14:02.415116 | 9440c987-a400-6181-5218-000000000034 | TIMING | Wait for connection to become available |
192.168.2.8

192.168.1.157