neutron/releasenotes/notes/default-subnetpool-semantic...

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---
features:
- The subnet API now includes a new
use_default_subnetpool attribute. This attribute can
be specified on creating a subnet in lieu of a
subnetpool_id. The two are mutually exclusive. If
it is specified as True, the default subnet pool for
the requested ip_version will be looked up and used.
If no default exists, an error will be returned.
deprecations:
- The default_subnet_pools option is now deprecated and
will be removed in the Newton release. The same
functionality is now provided by setting is_default
attribute on subnetpools to True using the API or
client.
fixes:
- Before Mitaka, when a default subnetpool was defined
in the configuration, a request to create a subnet
would fall back to using it if no specific subnet
pool was specified. This behavior broke the
semantics of subnet create calls in this scenario and
is now considered an API bug. This bug has been
fixed so that there is no automatic fallback with the
presence of a default subnet pool. Workflows which
depended on this new behavior will have to be
modified to set the new use_default_subnetpool
attribute when creating a subnet.