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Bug 2131679

Summary: [OVN][IPv6] Missing Neighbor Advertisements on router failover
Product: Red Hat OpenStack Reporter: Elvira <egarciar>
Component: openstack-neutronAssignee: Elvira <egarciar>
Status: CLOSED EOL QA Contact: Eran Kuris <ekuris>
Severity: high Docs Contact:
Priority: high    
Version: 17.0 (Wallaby)CC: chrisw, scohen
Target Milestone: ---Keywords: TestOnly, Triaged
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
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Story Points: ---
Clone Of: Environment:
Last Closed: 2023-10-10 12:21:23 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: 2131676    
Bug Blocks:    

Description Elvira 2022-10-03 10:00:47 UTC 
Description of problem: 
Test Only bug for BZ 2131676. 
We could see this happening in Openstack deployments using OVN too. This is a missing feature for Openstack L3 High Availability on IPv6.

Version-Release number of selected component (if applicable):
17.0

How reproducible:
100%

Steps to Reproduce:
1. Create an environment with ml2/OVN, HA and 2 controllers with gateway chassis
2. Make sure that your provider network (public) only has one IPv6 subnet assigned, and there are no IPv4 subnets attached to it.
(Optional) 3. Check that the Chassis with higher priority is the one with the active router.
4. Change the priority of the chassis with priority 1 to a higher priority than the other chassis. E.g:
ovn-nbctl set Gateway_Chassis <Chassis-id> priority=30
(Note that priority 30 is higher than priority 2)
 
Actual results:
We can't see Neighbor Advertisement being sent by the router from the now higher priority chassis

Expected results:
We should see them.

Additional info:
https://mail.openvswitch.org/pipermail/ovs-discuss/2022-September/052060.html