nova/releasenotes/notes/sriov-pf-passthrough-neutro...

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---
features:
- |
VLAN tags associated with instance network interfaces are now exposed via
the metadata API and instance config drives and can be consumed by the
instance. This is an extension of the device tagging mechanism added in
past releases. This is useful for instances utilizing SR-IOV physical
functions (PFs). The VLAN configuration for the guest's virtual interfaces
associated with these devices cannot be configured inside the guest OS from
the host, but nonetheless must be configured with the VLAN tags of the
device to ensure packet delivery. This feature makes this possible.
.. note:: VLAN tags are currently only supported via the Libvirt driver.