Segments extension¶
Neutron has an extension that allows CRUD operations on the /segments
resource in the API, that corresponds to the NetworkSegment entity in the
DB layer. The extension is implemented as a service plug-in.
Note
The segments service plug-in is not configured by default. To
configure it, add segments to the service_plugins parameter in
neutron.conf
Core plug-ins can coordinate with the segments service plug-in by
subscribing callbacks to events associated to the SEGMENT resource.
Currently, the segments plug-in notifies subscribers of the following events:
PRECOMMIT_CREATEAFTER_CREATEBEFORE_DELETEPRECOMMIT_DELETEAFTER_DELETE
As of this writing, ML2 and OVN register callbacks to receive events
from the segments service plug-in. The ML2 plug-in defines the
callback _handle_segment_change to process all the relevant segments
events.
Segments extension relevant modules¶
neutron/extensions/segment.pydefines the extensionneutron/db/models/segment.pydefines the DB models for segments and for the segment host mapping, that is used in the implementation of routed networks.neutron/db/segments_db.pyhas functions to add, retrieve and delete segments from the DB.neutron/services/segments/db.pydefines a mixin class with the methods that perform API CRUD operations for thesegmentsplug-in. It also has a set of functions to create and maintain the mapping of segments to hosts, which is necessary in the implementation of routed networks.neutron/services/segments/plugin.pydefines thesegmentsservice plug-in.
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