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[Kevin Benton <1609693@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

With DVR an IPv6 subnet being added to an interface will also add the
subnet to the CSNAT port. If adding the subnet to CSNAT fails (either
with a retriable error or a regular exception), the change to the
original router port will not be undone. This leads to inconsistency
between the two and results in errors like:

Details: {u'message': u'Bad router request: Router already has a port on
subnet 703ab4e2-8ce8-42b2-a5b8-436f9f9088b4.', u'detail': u'', u'type':
u'BadRequest'}


http://logs.openstack.org/53/350253/1/gate/gate-tempest-dsvm-neutron-dvr/f5df583/logs/testr_results.html.gz

** Affects: neutron
     Importance: Undecided
     Assignee: Kevin Benton (kevinbenton)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

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https://bugs.launchpad.net/bugs/1609693

Title:
  csnat port update failure does not undo port update

Status in neutron:
  New

Bug description:
  With DVR an IPv6 subnet being added to an interface will also add the
  subnet to the CSNAT port. If adding the subnet to CSNAT fails (either
  with a retriable error or a regular exception), the change to the
  original router port will not be undone. This leads to inconsistency
  between the two and results in errors like:

  Details: {u'message': u'Bad router request: Router already has a port
  on subnet 703ab4e2-8ce8-42b2-a5b8-436f9f9088b4.', u'detail': u'',
  u'type': u'BadRequest'}

  
  http://logs.openstack.org/53/350253/1/gate/gate-tempest-dsvm-neutron-dvr/f5df583/logs/testr_results.html.gz

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