Files
neutron/releasenotes/notes/1500-default-segment-mtu-54e2cf6aea9602d5.yaml
Sean M. Collins b2d0985d05 ML2: Increase segment_mtu from 0 to 1500 bytes
Neutron should return sane MTU values in the API. A Neutron Network
that has an MTU of zero wouldn't actually be a useful network, because
nothing could ever be transmitted. Zero is a junk value, so let's
replace it with standard ethernet MTU, which is a more believable value
to return to users.

Change-Id: I6a10c4dfc1f2198667f3d02528e2ca8020cb5bb8
Closes-Bug: #1549471
2016-02-26 09:58:23 -05:00

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YAML

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