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[Corey Bryant <1904399@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron (Ubuntu Groovy)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Focal)
       Status: New => Triaged

** Changed in: neutron
       Status: In Progress => Fix Released

** Changed in: neutron (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: neutron (Ubuntu Groovy)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1904399

Title:
  [OVN] Inconsistent "flooding to unregistered" IGMP configuration

Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Focal:
  Triaged
Status in neutron source package in Groovy:
  Triaged
Status in neutron source package in Hirsute:
  Fix Released

Bug description:
  ML2/OVN reuses the same "[ovs]/igmp_snooping_enable" configuration
  option from ML2/OVS, which says [0]:

  "Setting this option to True will also enable Open vSwitch mcast-
  snooping-disable-flood-unregistered flag. This option will disable
  flooding of unregistered multicast packets to all ports."

  But, that's not true for ML2/OVN, in fact, this is the opposite
  because ML2/OVN does have the option to flood to unregistered VMs
  enabled by default.

  In order to keep the consistent between both drivers and this
  configuration option, ML2/OVN needs to disable the
  "mcast_flood_unregistered" configuration in the other_config column
  from the Logical Switch table when igmp_snooping_enable is True.

  
  [0] https://opendev.org/openstack/neutron/src/branch/master/neutron/conf/agent/ovs_conf.py#L36-L47

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