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[Erik Colnick <erik.colnick@xxxxxxx>]

Setting this to 'invalid' since it isn't actually a bug.  According to
the original spec [1], this behavior (declining to create a VLAN
transparent network in the case that any driver does not have the
attribute or has the attribute set to false) is what is expected.

[1]
http://specs.openstack.org/openstack/neutron-specs/specs/kilo/nfv-vlan-trunks.html#work-items

** Changed in: neutron
       Status: Incomplete => Invalid

** Tags removed: mitaka-backport-potential

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https://bugs.launchpad.net/bugs/1611843

Title:
  MechanismManager fails to create vlan-transparent network incorrectly
  with legacy plugins

Status in neutron:
  Invalid

Bug description:
  As currently implemented, the _check_vlan_transparency method in the
  MechanismManager class will fail if there is any mechanism driver in
  the configured mechanism drivers list which does not implement the
  check_vlan_transparency method.  This is because the check for support
  of vlan transparency currently fails if the call on the mechanism
  driver check_vlan_transparency returns either False (the mechanism
  driver explicitly advertises that it does not support vlan transparent
  networks by overriding the check_vlan_transparency method inherited
  from the base class) or if it returns 'None' (which is the result of
  the mechanism driver not overriding the base class
  check_vlan_transparency method).

  The initial implementation of vlan-transparency support in the
  MechanismManager class only raised an error in the event that a driver
  explicitly returned 'False' from its check_vlan_transparency method
  (https://review.openstack.org/#/c/158420/18/neutron/plugins/ml2/managers.py),
  however this logic was changed when the support was moved from core to
  extension (https://review.openstack.org/#/c/169569/).

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