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[Sean Dague <sean@xxxxxxxxx>]

This is apparently fixed in os-vif for Newton and beyond. Marking
Invalid on the Nova side because the logic doesn't live in Nova in any
supported version.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1649845

Title:
  Interface drivers don't update port MTU if the port already exists

Status in networking-midonet:
  New
Status in neutron:
  Fix Released
Status in OpenStack Compute (nova):
  Invalid
Status in os-vif:
  Fix Released

Bug description:
  This is needed because Neutron allows to change MTU values for
  networks (through configuration options modification and neutron-
  server restart). Without that, there is no way to apply new MTU for
  DHCP and router ports without migrating resources to other nodes.

  I suggest we apply MTU on conseqent plug() attempts, even if port
  exists.

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