neutron/releasenotes/notes/add-multiple-port-bindings-...

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---
prelude: >
Support multiple bindings for compute owned ports.
features:
- |
In order to better support instance migration, multiple port
bindings can be associated to compute owned ports.
* Create, update, list, show and activate operations are supported
for port bindings by the ReST API.
* A compute owned port can have one active binding and many
inactive bindings.
* There can be only one binding (active or inactive) per compute
host.
* When the ``activate`` operation is executed, a previously
inactive binding is made active. The previously active binding
becomes inactive.
* As a consequence of the multiple port bindings implementation,
the ``port_binding`` relationship in the SQLAlchemy ``Port``
object has been renamed ``port_bindings``. Similarly, the
``binding`` attribute of the ``Port`` OVO has been renamed
``bindings``.