[Bug 1965297] Re: l3ha don't set backup qg ports down

[Brian Murray]

Hello Edward, or anyone else affected,

Accepted neutron into jammy-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/neutron/2:20.1.0-0ubuntu2 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: neutron (Ubuntu Jammy)
       Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-jammy

** Changed in: neutron (Ubuntu Impish)
       Status: Triaged => Fix Committed

** Tags added: verification-needed-impish

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https://bugs.launchpad.net/bugs/1965297

Title:
  l3ha don't set backup qg ports down

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in Ubuntu Cloud Archive wallaby series:
  Triaged
Status in Ubuntu Cloud Archive xena series:
  Triaged
Status in Ubuntu Cloud Archive yoga series:
  Triaged
Status in Ubuntu Cloud Archive zed series:
  Triaged
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Focal:
  Triaged
Status in neutron source package in Impish:
  Fix Committed
Status in neutron source package in Jammy:
  Fix Committed
Status in neutron source package in Kinetic:
  Triaged

Bug description:
  The history to this request is as follows; bug 1916024 fixed an issue
  that subsequently had to be reverted due to a regression that it
  introduced (see bug 1927868) and the original issue can once again
  present itself in that keepalived is unable to send GARP on the qg
  port until the port is marked as UP by neutron which in loaded
  environments can sometimes take longer than keepalived will wait (e.g.
  when an l3-agent is restarted on a host that has hundreds of routers).
  The reason why qg- ports are marked as DOWN is because of the patch
  landed as part of bug 1859832 and as I understand it there is now
  consensus from upstream [1] to revert that patch as well and a better
  solution is needed to fix that particular issue. I have not found a
  bug open yet for the revert hence why I am opening this one.

  [1]
  https://meetings.opendev.org/meetings/neutron_drivers/2022/neutron_drivers.2022-03-04-14.03.log.txt

  ------------

  [Impact]
  Please see LP bug description for full details but in short, this patch is a revert of a patch that has show instability in the field for users of Neutron L3HA.

  [Test Plan]
    * Deploy Openstack with Neutron L3 HA enabled
    * Create a number of HA routers
    * Check all qrouter namespaces and ensure that the qg- port is UP in all

  [Regression Potential]
  Since the original patch was intended to address issues with MLDv2 it is possible that reverting it will re-introduce those issues and a new patch will need to be proposed to address that.

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