nova/releasenotes/notes/neutron-mtu-6a7edd9e396107d...

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---
deprecations:
- The ``network_device_mtu`` option in Nova is deprecated for removal since
network MTU should be specified when creating the network with
nova-network. With Neutron networks, the MTU value comes from the
``segment_mtu`` configuration option in Neutron.
other:
- The Neutron network MTU value is now used when plugging virtual interfaces
in nova-compute. If the value is 0, which is the default value for the
``segment_mtu`` configuration option in Neutron before Mitaka, then the
(deprecated) ``network_device_mtu`` configuration option in Nova is used,
which defaults to not setting an MTU value.