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

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

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

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https://bugs.launchpad.net/bugs/1204850

Title:
  one port_id can add to two instance

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  First:
  use interfaceAttachment only with port_id to add a nic for instance1,——》success

  Second，
  if instance2 and instance1 are in the same compute node
  use interfaceAttachment only with the same port_id to add a nic for instance2,——》failed
  {
      "computeFault": {
          "message": "Failed to attach interface",
          "code": 500
      }
  }

  if instance2 and instance1 are not in the same compute node
  use interfaceAttachment only with the same port_id to add a nic for instance2,——》success

  
  The two instance have the same mac and ip, so this is a bug

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