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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1515341

Title:
  DVR associating a new floatingip on existing network fails after
  restart of l3 agent

Status in neutron:
  Fix Released

Bug description:
  If DVR is enabled and an l3-agent is restarted, adding a new vm to an
  existing network and then associating a floating ip to that vm will
  fail and set all floating ip statuses on that network to 'ERROR'.  In
  tracking down this issue, it appears that the 'floating_ip_added_dist'
  method in agent/l3/dvr_local_router.py attempts to invoke
  'self.rtr_fip_subnet.get_pair()' without first checking that
  self.rtr_fip_subnet is not None.

  To reproduce this issue:
  On a running DVR enabled installation, create a network, subnet, external network and router.
  Boot a vm on the network and associate a floating ip to the vm.
  Restart the neutron-l3-agent on the compute node hosting the vm.
  Boot a second vm on the existing network hosted on the compute node where the neutron-l3-agent has been restarted.
  Associate a new floatingip to the second vm.
  Observe that the flaotingip is in the ERROR state and that the vm is not pingable via that floatingip.

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