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[Lucas Alvares Gomes <1904399@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: neutron
     Importance: Medium
     Assignee: Lucas Alvares Gomes (lucasagomes)
         Status: New


** Tags: ovn

** Changed in: neutron
     Assignee: (unassigned) => Lucas Alvares Gomes (lucasagomes)

** Changed in: neutron
   Importance: Undecided => Medium

** Changed in: neutron
   Importance: Medium => High

** Changed in: neutron
   Importance: High => Medium

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

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

Status in neutron:
  New

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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