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[Armando Migliaccio <1543012@xxxxxxxxxxxxxxxxxx>]

Is this really a Neutron bug? The stacktrace seems to lead to a plugin-
specific trace. Can you repro elsewhere?

** Also affects: vmware-nsx
   Importance: Undecided
       Status: New

** Changed in: vmware-nsx
       Status: New => Confirmed

** Changed in: vmware-nsx
       Status: Confirmed => In Progress

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Title:
  Routres: attaching a router to a external network without a subnet
  leads to exceptions

Status in neutron:
  In Progress
Status in vmware-nsx:
  In Progress

Bug description:
  2016-01-29 06:45:03.920 18776 ERROR neutron.api.v2.resource [req-c2074082-a6d0-4e5a-8657-41fecb82dacc ] add_router_interface failed
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 83, in resource
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource result = method(request=request, **args)
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 207, in _handle_action
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource return getattr(self._plugin, name)(*arg_list, **kwargs)
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/vmware_nsx/neutron/plugins/vmware/plugins/nsx_v.py", line 1672, in add_router_interface
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource context, router_id, interface_info)
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/vmware_nsx/neutron/plugins/vmware/plugins/nsx_v_drivers/shared_router_driver.py", line 723, in add_router_interface
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource context, router_id, router_db.admin_state_up)
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/vmware_nsx/neutron/plugins/vmware/plugins/nsx_v_drivers/shared_router_driver.py", line 468, in _bind_router_on_available_edge
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource self._get_available_and_conflicting_ids(context, router_id))
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/vmware_nsx/neutron/plugins/vmware/plugins/nsx_v_drivers/shared_router_driver.py", line 273, in _get_available_and_conflicting_ids
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource gwp['fixed_ips'][0]['subnet_id'])
  2016-01-29 06:45:03.920 18776 TRACE neutron.api.v2.resource IndexError: list index out of range

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