2016-02-24 16:00:12 -05:00
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---
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prelude: >
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2016-03-05 07:36:30 -08:00
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The ML2 plug-in supports calculating the MTU for networks
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2016-02-24 16:00:12 -05:00
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that are realized as flat or VLAN networks, by consulting the
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'segment_mtu' option. Prior to Mitaka, 'segment_mtu' defaults to 0 which
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disables this feature. This creates slightly confusing API results when
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querying Neutron networks, since the plugins that support the MTU API
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extension would return networks with the MTU equal to zero. Networks
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with an MTU of zero make little sense, since nothing could ever be transmitted.
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In Mitaka, 'segment_mtu' now defaults to 1500 which is the standard MTU for Ethernet
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networks in order to improve the "out of box" experience for typical deployments.
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features:
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- In Mitaka, queries to the Networking API for network objects will now
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return network objects that contain a sane MTU value.
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upgrade:
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- Operators using the ML2 plug-in with existing data may need
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to perform a database migration to update the MTU for existing networks
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