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[sean mooney <1933517@xxxxxxxxxxxxxxxxxx>]

** Also affects: os-vif
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1933517

Title:
  [RFE][OVN] Create an intermediate OVS bridge between VM and
  intergration bridge to improve the live-migration process

Status in neutron:
  New
Status in os-vif:
  New

Bug description:
  When live migrating network sensitive VMs, the communication is
  broken.

  This is similar to [1] but in OVN the vif-plugged events are directly
  controller by the Neutron server, not by the OVS/DHCP agents.

  The problem lies in when the destination chassis creates the needed OF
  rules for the destination VM port. Same as in OVS, the VM port is
  created when the instance is unpaused. At this moment the VM continues
  sending packets through the interface but OVN didn't finish the
  configuration.

  Related BZs:
  - OSP16.1: https://bugzilla.redhat.com/show_bug.cgi?id=1903653
  - OSP16.1: https://bugzilla.redhat.com/show_bug.cgi?id=1872937
  - OSP16.1: https://bugzilla.redhat.com/show_bug.cgi?id=1966512

  [1]https://bugs.launchpad.net/neutron/+bug/1901707

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