Description of problem: All production Instances (1400+) lost network connectivity during the 16.2 - 17.1 FFU upgrade. Issue noticed after customer ran the upgrade run [1] for allovercloud and undercloud as part of the step 8.1.3 from the FFU doc. [1] 2024-07-15 22:19:37.296701 overcloud-upgrade-run limit=allovercloud,undercloud, playbook=['all'], static_inventory=None, ssh_user=tripleo-admin, tags=, skip_tags=, stack=overcloud, yes=True, ansible_forks=None Version-Release number of selected component (if applicable): 16.2.4 17.1.3 How reproducible: NA Steps to Reproduce: NA Actual results: Network connectivity to all the production instances were impacted. Expected results: During FFU network connectivity to the production instance shouldn't impact.
*** This bug has been marked as a duplicate of bug 2295757 ***