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[sunzuohua <zuohuasun@xxxxxxxxx>]

** Changed in: neutron
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1789824

Title:
  One single ip is allocated for a port in the network with multiple
  subnets

Status in neutron:
  Invalid

Bug description:
  Steps:
  1.Create a network with multiple subnets.
  2.Create a port with the network above.
  3.Port is created, but only one ip is allocated for the port.

  The problem is as follows in [1]:
  def _allocate_ips_for_port(self, context, port):
           ..............
           ..............
           ..............
           .............
          else:
              ips = []
              version_subnets = [v4, v6_stateful]
              for subnets in version_subnets:
                  if subnets:
                      ips.append([{'subnet_id': s['id']}#"extend"should be used instead of "append"
                                  for s in subnets])


  [1]https://github.com/openstack/neutron/blob/master/neutron/db/ipam_pluggable_backend.py#L223

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