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[Rodolfo Alonso <2101140@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The port binding phase is part of the VM spawning process. Regardless of
the backend used (ML2/OVN, ML2/OVS), it needs to detect the port created
and inform to the Neutron API. At this point, the Neutron API will
consider the port as UP and will inform to Nova (vif-plugged-event);
Nova will send the port binding request after this event.

In ML2/OVN it is possible that the OVN databases are configured in a
OVSDB RAFT cluster. If by any circumstance the RAFT leader changes, the
active IDL connections to OVN NB and SB databases will temporarily
disconnect and reconnect again. During this time gap, if the
``LogicalSwitchPortUpdateUpEvent`` arrives, it won't be processed.

When the IDL reconnects, it will send all the registers tagged as
CREATED, including the missed Logical_Switch_Port event setting to UP
this port.

The goal of this bug is to make this event resilient to IDL
disconnections and prevent timeouts during a VM creation.

[1]https://docs.ovn.org/en/latest/tutorials/ovn-ovsdb-relay.html

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2101140

Title:
  [OVN] Make LSP up/down events processing resilient to IDL
  disconnections

Status in neutron:
  New

Bug description:
  The port binding phase is part of the VM spawning process. Regardless
  of the backend used (ML2/OVN, ML2/OVS), it needs to detect the port
  created and inform to the Neutron API. At this point, the Neutron API
  will consider the port as UP and will inform to Nova (vif-plugged-
  event); Nova will send the port binding request after this event.

  In ML2/OVN it is possible that the OVN databases are configured in a
  OVSDB RAFT cluster. If by any circumstance the RAFT leader changes,
  the active IDL connections to OVN NB and SB databases will temporarily
  disconnect and reconnect again. During this time gap, if the
  ``LogicalSwitchPortUpdateUpEvent`` arrives, it won't be processed.

  When the IDL reconnects, it will send all the registers tagged as
  CREATED, including the missed Logical_Switch_Port event setting to UP
  this port.

  The goal of this bug is to make this event resilient to IDL
  disconnections and prevent timeouts during a VM creation.

  [1]https://docs.ovn.org/en/latest/tutorials/ovn-ovsdb-relay.html

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