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Bug 2247087

Summary:	[OSP16.2->17.1] Instances lose IPv6 connectivity during upgrade
Product:	Red Hat OpenStack	Reporter:	Francois Palin <fpalin>
Component:	openstack-tripleo-heat-templates	Assignee:	Terry Wilson <twilson>
Status:	CLOSED DUPLICATE	QA Contact:	Joe H. Rahme <jhakimra>
Severity:	high	Docs Contact:
Priority:	high
Version:	17.1 (Wallaby)	CC:	aruffin, bshephar, coldford, fyanac, mburns, mtomaska
Target Milestone:	---	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-03-26 21:16:09 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2254412
Bug Blocks:

Description Francois Palin 2023-10-30 15:59:20 UTC

Description of problem:
During "openstack overcloud upgrade run --yes --stack <stack> --debug --limit allovercloud,undercloud --playbook all", 
for about 23 minutes most IPv6 pings between VMs on the overcloud stopped. All VM ports in the test environment are dual 
stacked and the IPv4 ports did not have issues with pings. By the end of the upgrade, all pings were working as expected.


Version-Release number of selected component (if applicable):
OSP 17.1

How reproducible:
Always, in customer setup.

Steps to Reproduce:
1. Set up an OSP16.2 
2. Set up a VM with IPv6 interfaces on 2 separate hosts, start pinging between VMs
3. Run 16.2 to 17.1 upgrade
4. Upgrade completes fine

Actual results:
During upgrade, IPv6 pinging stops for more than 20 minutes.

Expected results:
VM IPv6 connectivity is preserved throughout upgrade, or minimally impacted

Additional info: