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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => icehouse-3

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https://bugs.launchpad.net/bugs/1270973

Title:
  Remove and recreate interface if already exists

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  If a nova-compute machine restarts when openvswitch comes up it logs
  the following warning messages for all tap interfaces that do not
  exist:

  bridge|WARN|could not open network device tap2cf7dbad-9d (No such
  device)

  Once the compute-node  starts it recreates the interfaces and re-adds them to the
  ovs-bridge. Unfortunately, ovs does not reinitialize the interfaces as they
  are already in ovsdb and does not assign them a ofport number.

  This situation corrects itself though the next time a port is added to the
  ovs-bridge which is why no one has probably noticed this issue till now.

  In order to correct this we should first remove interface that exist and
  then readd them.

  same bug on neutron-side:
  https://bugs.launchpad.net/neutron/+bug/1268762

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