[Bug 1957817] Please test proposed package

[Corey Bryant]

Hello James, or anyone else affected,

Accepted ovn into ussuri-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
-proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:ussuri-proposed
  sudo apt-get update

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, and change the tag
from verification-ussuri-needed to verification-ussuri-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-ussuri-failed. In either case, details of your
testing will help us make a better decision.

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

** Changed in: cloud-archive/ussuri
       Status: New => Fix Committed

** Tags added: verification-ussuri-needed

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to ovn in Ubuntu.
https://bugs.launchpad.net/bugs/1957817

Title:
  Multicast traffic is broken between VMs on different hypervisors using
  provider networks

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Fix Released

Bug description:
  [Impact]
  In an OpenStack Ussuri (both Focal and Bionic) cloud we discovered that multicast traffic would fail between VMs on different hypervisors and when using provider networks.

  [Test Plan]
  The upstream fix also contains an addition to the OVN testsuite confirming the correct behavior. We cat utilize this test case to perform both a control test on a unmodified package as well as confirming that a updated package fixes the problem.

  [Regression Potential]
  The fix touches a code path that is executed only when OVN is configured to enable handling of Multicast traffic. The fix has also been available for several upstream releases without any reported issues.

  [Original Bug Description]
  In an OpenStack Ussuri (both Focal and Bionic) cloud we discovered that multicast traffic would fail between VMs on different hypervisors and when using provider networks.  The following table reflects what we found works/didn't work:

   https://paste.ubuntu.com/p/QZZBjrTSFQ/

  Based on this, I went looking at relevant changes upstream and found
  that this appears to have been fixed upstream, but not backported to
  OVN 20.03:

  https://github.com/ovn-
  org/ovn/commit/97778ab3e422ac071faa67f9f477fd54977e9c04

  I backported this patch to the version of OVN in Ussuri here:

    https://launchpad.net/~elmo/+archive/ubuntu/sf322809

  These patched packages have been tested on a customer site and
  confirmed to fix the problem.

  I've attached the patch from the PPA for convenience.

To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-archive/+bug/1957817/+subscriptions