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[Launchpad Bug Tracker <1328128@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1328128

Title:
  In ovs agent, when a port is added and then removed in a short time,
  this port may lose its vlan tag.

Status in neutron:
  Expired

Bug description:
  When a port is added, ovs agent runs scan_ports to get all changed
  ports, so it will be in port_info['current'] and port_info['added'].
  Then this port is removed (by nova or ohters) before
  treat_devices_added_or_updated called, means
  self.int_br.get_vif_port_by_id(device) returns None and for loop just
  continues, no treat_vif_port called and this port is not in
  lvm.vif_ports, however this port is still in "current ports" and saved
  in reg_ports before next scan. When we add this port back again, it
  would not be treated as added since it's in reg_ports and not treated
  as updated since it's not in any lvm.vif_ports, this port losts vlan
  tag permanently util we remove it again.

  I think the fix is simple, if self.int_br.get_vif_port_by_id(device)
  cannot get port, just resync next time.

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