[Bug 1957817] Re: Multicast traffic is broken between VMs on different hypervisors using provider networks

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~fnordahl/ubuntu/+source/ovn/+git/ovn/+merge/416078

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https://bugs.launchpad.net/bugs/1957817

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

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  In Progress

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.

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