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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

While associate floating ip to instance, we did not check the floating IP is already assigned to
another port or not:
http://git.openstack.org/cgit/openstack/nova/tree/nova/network/neutronv2/api.py#n1684
It is understandable to allow re-assign to the same port, but we should not re-assgin
if it is already assigned to other ports.

** Affects: neutron
     Importance: Undecided
     Assignee: zhaobo (zhaobo6)
         Status: New

** Affects: nova
     Importance: Undecided
     Assignee: Zhenyu Zheng (zhengzhenyu)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Zhenyu Zheng (zhengzhenyu)

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https://bugs.launchpad.net/bugs/1659215

Title:
  Should not allow assign floating IPs that are already assigned to
  another port

Status in neutron:
  New
Status in OpenStack Compute (nova):
  New

Bug description:
  While associate floating ip to instance, we did not check the floating IP is already assigned to
  another port or not:
  http://git.openstack.org/cgit/openstack/nova/tree/nova/network/neutronv2/api.py#n1684
  It is understandable to allow re-assign to the same port, but we should not re-assgin
  if it is already assigned to other ports.

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