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[Brian Haley <1723828@xxxxxxxxxxxxxxxxxx>]

Closing based on last comment from Swami that these namespaces are being
used for fast path exit.

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

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https://bugs.launchpad.net/bugs/1723828

Title:
  FIP ns created on network node for DVR

Status in neutron:
  Invalid

Bug description:
  I have a devstack with following configuration:
  network nodes:
      /etc/neutron/l3_agent.ini
      [default]
      agent_mode = dvr_snat
  compute nodes:
      /etc/neutron/l3_agent.ini
      [default]
      agent_mode = dvr_no_external

  The reproduction steps
  1.Launch VM and assign floating IP to it
  2.Check namespace on network nodes.
  3.You can see fip namespace on network nodes.

  I guess the problem is that DvrLocalRouter is the inherited class of DvrEdgeRouter.
  DvrLocalRouter will not create fip namespace only on nodes with "dvr_no_external" mode[1].
  [1]https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_local_router.py#L569

  Mybe DvrLocalRouter should not create fip namespace on nodes with
  "dvr_no_external" and "dvr_snat" mode.

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