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+VOLTHA 2.9 Release Notes
+========================
+
+Highlights
+----------
+
+VOLTHA-2.9 builds on the existing 2.8 Long Term Support (LTS) release for VOLTHA.
+
+The release focused on including some important underlying architectural changes that were avoided before the LTS
+release. With VOLTHA 2.9 Kafka was removed as a mechanism for the inter-container communication and the ONOS OLT app
+was completely rewritten, moreover a new transparent OLT tagging workflow has been introduced, to support
+new operators, e.g. TIM. OLT Underlying software was updated to newer APIs. Other enhancements included resource
+limits for the various components, optimization on the OMCI channel and proper cleanup of several items and resources.
+During the 2.9 continuous support of the 2.8 release was done, with continuous bug fixes based on the jenkins
+nightly suite and 2.9 discoveries.
+
+
+VOLTHA 2.9 first and foremost moved away from the Kafka bus for inter container communication. Removing Kafka made the
+interaction between the different VOLTHA components (core and adapters) direct and with no serialization overhead,
+guaranteeing not only faster communication but an immediate response for operations. Removing Kafka uncovered several
+bugs related to timing between the core and the adapters. All of these were fixed and where applicable also back-ported
+to the 2.8 release.
+Alongside the removal of Kafka, while the voltha-protos and voltha-lib go were modified a cleanup of stale APIs and
+objects was performed, clarifying the supported protos objects and simplifying the library functions.
+
+During the VOLTHA 2.9 release the OLT ONOS app was completely re-written to ensure better code quality, workflow
+separation, correct handling and ordering of events. The app is based on a per subscriber queue mechanism, not on a
+series of java completable futures, which were hard to coordinate. The queue mechanism also increased speed and
+performance of the app. Furthermore code quality vastly improved, making the app now much more extensible as
+showcased by a new transparent OLT workflow that was integrated. ONOS was moved to ONOS 2.5.4, which includes a
+key bugfix on the application store to enable In Service Software Update (ISSU) of ONOS instances. The 2.5.4 includes
+also other bug fixes on the 2.5 LTS version.
+Along with the OLT app queuing mechanism a flow serialization and queuing mechanism was also introduced in the
+openonu adapter and finalized in the OLT adapter to handle flows and technology profile instances, ensuring correct
+ordering at this level as well.
+
+Transparent OLT tagging capability has been integrated in VOLTHA and ONOS. Configuring the 4096 VLAN in sadis as
+c-tag for a subscriber now makes the OLT just transparently forward traffic, which must be double tagged. No VLAN
+operation will be performed after the ONT tags the packet. Such workflow requirement from Telecom Italia that,
+thanks to this support, can now deploy VOLTHA in their network.
+
+The Broadcom Abstraction Layer has been moved to BAL 3.10.2.2. A major version upgrade that ensures inclusion of
+multiple bug fixes and setting up for feature support such as LAG and IPv6.
+
+Several enhancements were made on the interaction and process with the ONUs. First and foremost VOLTHA 2.9 supports
+OMCI prioritized sending allowing operations such as ONU software download to have lower priority than other
+configuration requests. The decoding of MEs has been relaxed and storing of unknown MEs has been implemented,
+allowing the inclusion of non-standard MEs from ONUs, expanding the pool of supported devices.
+
+Finally the release provided bug fixes across the stack. Previously discussed were the ETCD stale information
+fixes that ensured Proper Cleanup of resources in the storage after device/flows delete. Cleanup of VTFD and
+other resources is also performed on the ONU.
+Several fixes were brought in the ONU image upgrade procedures concerning multiple ONUs, allowing abort during any
+phase and correct indication statuses. The ONU port locking state is also now correctly reported. Fixes were also
+included for flow deletion operation during reconciliation and possible deadlocks for Flow/GemPort multi-uni scenarios.
+Serialization was enhanced in omci-lib-go.  For a complete list of bugs please refer to the Jira Issues section.
+
+On the testing front VOLTHA 2.9 expanded the openonu suite with new multi-uni and multi-olt tests, extending the ONU
+software update success and failure scenarios.  2.9 expands the TT multicast tests to 7 tests from the basic first
+test. Container restart tests now include a continuous background ping. ONU delete and re-add is also tested,
+alongside the before-mentioned correct device, subscriber and service information deletion across the stack.
+Furthermore 3 new OLTs were added to Certification for both the 2.8 and 2.9 releases, Radisys 1600G and 1600X and
+the ADTRAN 6320.
+
+During the 2.9 release also key design discussions have been happening to have BBF relationship and design discussion
+for IPv6, Plain Old Telephone Support (POTS), LAG and the next iteration of a controller for VOLTHA that will replace
+ONOS.
+
+Along with VOLTHA 2.9, the Device Management Brigade also released a new minor version
+(`1.1.1 <https://github.com/opencord/device-management-interface/releases/tag/v1.1.1>`_) of the interface with
+Introduce PON-ID related APIs, port mapping labels and auto-negotiation parameters.
+
+
+Features & Improvements
+-----------------------
+
+- Move to gRPC for inter container communication
+
+  - Removal of Kafka bus for internal use
+  - Direct communication between containers via gRPC
+  - Immediate response for request
+  - Faster container to container interaction
+  - Fixed several bug fixes exposed by different/faster timing in interaction
+
+- Complete OLT application rewrite
+
+  - Queue based mechanism for subscribers and events
+  - Flow installation feedback
+  - Better performance and event sequence handling
+  - Better code quality and extensibility
+  - Fully backwards compatible with VOLTHA 2.8
+
+- Transparent OLT workflow
+
+  - 4096 c-tag translates into no VLAN operation performed at the OLT
+  - Support in olt pipeliner in ONOS, olt adapter and agent
+  - Full support for TIM HISA workflow
+
+- ONU interaction enhancements in openonu adapter
+
+  - Prioritized OMCI sending
+  - Relaxed decoding and storing of unknown MEs
+  - PM counter Reset
+  - Flow serialization and queueing mechanism
+
+- Move to ONOS 2.5.5 with bug fixes to support ISSU
+- Broadcom Abstraction Layer (BAL) has been moved to BAL 3.10.2.2
+
+Bug Fixes
+---------
+
+- Proper Cleanup of resources in ETCD and on the ONU after device/flows delete.
+
+- ONU image upgrade
+
+  - multiple ONUs
+  - abort during any phase
+  - correct indication statuses
+
+- Correct ONU port locking state indication
+- Flow deletion operations during reconciliation
+- Flow/GemPort deadlock in multi-uni scenarios
+- Error reporting from openolt-agent for scheduler and queue configurations
+- Error corrections at openolt adapter in case of scheduler and queue confi\guration failures
+- OMCI lib-go
+
+  - serialization of Alarms
+  - Mib upload next decoding error
+
+
+Test
+----
+
+Voltha-2.9 tests are available on `Jenkins <https://jenkins.opencord.org/>`_.
+
+- Multi-uni and multi-olt tests for openonu adapter suite.
+- Extended the ONU software update success and failure test scenarios.
+- Extended Turk Telecom multicast tests to 5 tests.
+- Container restart tests now include a continuous background ping.
+- Added test for updating and validating user bandwidth profile for ATT and DT.
+- Enhanced the tests voltha logging.
+- Enhanced DT soak pod job with bbsim subscribers provisioning (to mock system load).
+- Optimised timeouts for DT and TT workflow tests.
+- Added support for subscriber uniTag provisioning for TT test suite.
+- ONU delete and re-add.
+- Empty device, subscriber and service information verification after deletion.
+
+
+Design Discussions
+------------------
+
+- LAG and LACP
+- Voice Support on multi UNI devices
+- IPv6 support
+- DPU support Design discussion
+- New micro-service controller for VOLTHA (onos-classic replacement)
+- BBF API integration
+
+
+
+Documentation
+-------------
+
+- Updated documentation with alarms, meters/bandwidth profiles and several other enhancements
+  is published on https://docs.voltha.org
+
+Known Issues
+------------
+
+- Edgecore ASxVOLT16 platform issues requiring hard/soft reboot(s). `[VOL-4520] <https://jira.opencord.org/browse/VOL-4520>`_
+- Packets arrive on the wrong gem port in the upstream after XGSPON ONU disable/enable. `[VOL-4521] <https://jira.opencord.org/browse/VOL-4521>`_
+- Packets arrive on the wrong gem port with Radisys 1600X OLT with BAL 3.10.2.2 `[VOL-4527] <https://jira.opencord.org/browse/VOL-4527>`_
+- voltha-onos is based on snapshots due to sonatype issue `[VOL-4528] <https://jira.opencord.org/browse/VOL-4528>`_
+
+
+Certification Program
+---------------------
+
+Thanks to the `Continuous Certification <https://opennetworking.org/continuous-certification-program>`_ program at
+ONF we can also ensure that the following ONF member products are compatible with the VOLTHA 2.9 release:
+
+- Edgecore ASGVolt64 GPON OLT
+- Edgecore ASXVolt16 XGSGPON OLT
+- Radisys 3200G GPON OLT
+- Radisys 1600G GPON OLT
+- Radisys 1600X COMBO OLT
+- Adtran 6320X COMBO OLT
+- Sercomm FG1000 GPON ONU
+- Sercomm Glasfaser GPON ONU
+- Edgecore 6712-32X Switch
+- Edgecore 7712-32X Switch
+
+In particular the 2.8 release added the Radisys 3200G GPON OLT.
+
+Jira stories
+------------
+A full list of stories and bugs completed can be found under the
+`VOLTHA 2.9 <https://jira.opencord.org/projects/VOL/versions/12200>`_ release page in Jira.
+
+Component Versions in VOLTHA 2.9 release
+----------------------------------------
+
+.. note::
+  ONOS and the voltha related apps have not yet been released due to an issue with
+  `Sonatype <https://twitter.com/sonatype_ops/status/1471099908300189705>`_. Following are the versions to which ONOS
+  and the apps will be released when the issue is resolved. For now we suggest you either build your voltha-onos image
+  yourself using ``onosproject/onos:2.5-latest`` and the top of the apps master branch or use
+  `voltha/voltha-onos:5.0.4-rc1 <https://hub.docker.com/layers/voltha/voltha-onos/5.0.4-rc1/images/sha256-da570cd6462b0d74ee763b7350e9ecb617d1f68c0002e97917390dd563cb78f8?context=explore>`_
+  , which is a custom built image by ONF including ONOS and the apps at the right commit.
+  A new image will be pushed when the issues is resolved.
+
+
+ONOS and Atomix:
+++++++++++++++++
+
+- `ONOS 2.5 LTS <https://github.com/opennetworkinglab/onos/releases/tag/2.5.2>`_: ``2.5.5``
+- `ATOMIX <https://github.com/atomix/atomix/releases/tag/atomix-3.1.9>`_: ``3.1.9``
+
+ONOS Apps:
+++++++++++
+
+- `aaa <https://gerrit.opencord.org/gitweb?p=aaa.git;a=summary>`_: ``2.5.0``
+- `dhcpl2relay <https://gerrit.opencord.org/gitweb?p=dhcpl2relay.git;a=summary>`_: ``2.5.0``
+- `igmpproxy <https://gerrit.opencord.org/gitweb?p=igmpproxy.git;a=summary>`_: ``2.4.0``
+- `kafka <https://gerrit.opencord.org/gitweb?p=kafka-onos.git;a=summary>`_: ``2.8.0``
+- `mcast <https://gerrit.opencord.org/gitweb?p=mcast.git;a=summary>`_: ``2.5.0``
+- `olt <https://gerrit.opencord.org/gitweb?p=olt.git;a=summary>`_: ``5.5.0``
+- `sadis <https://gerrit.opencord.org/gitweb?p=sadis.git;a=summary>`_: ``5.5.0``
+- `bng <https://gerrit.opencord.org/gitweb?p=bng.git;a=summary>`_: ``2.2.0``
+- `pppoeagent <https://gerrit.opencord.org/plugins/gitiles/pppoeagent/>`_: ``1.2.0``
+- `olttopology <https://gerrit.opencord.org/plugins/gitiles/olttopology/>`_: ``1.2.0``
+
+VOLTHA Components:
+++++++++++++++++++
+
+- `Helm Charts (voltha-helm-charts) <https://gerrit.opencord.org/gitweb?p=voltha-helm-charts.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``2.9.0``
+- `bbsim <https://gerrit.opencord.org/gitweb?p=bbsim.git;a=tree>`_- ``1.9.1`` with `chart <https://gerrit.opencord.org/gitweb?p=helm-charts.git;a=tree;f=bbsim>`_ ``4.5.2``
+- `voltha-go <https://gerrit.opencord.org/gitweb?p=voltha-go.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``3.0.2`` with chart ``2.10.9``
+- `ofagent-go <https://gerrit.opencord.org/gitweb?p=ofagent-go.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``2.0.1``  with chart ``2.10.9``
+- `voltctl <https://gerrit.opencord.org/gitweb?p=voltctl.git;a=tree>`_ - ``1.7.4``
+- `voltha-openolt-adapter <https://gerrit.opencord.org/gitweb?p=voltha-openolt-adapter.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``4.1.5`` with chart ``2.10.8``
+- `voltha-openonu-adapter-go <https://gerrit.opencord.org/gitweb?p=voltha-openonu-adapter-go.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``2.1.2`` with chart ``2.9.11``
+- `voltha-onos <https://gerrit.opencord.org/gitweb?p=voltha-onos.git;a=tree;h=refs/heads/voltha-2.9>`_ -  ``5.0.4-rc1`` with chart ``0.1.26``
+- `openolt agent <https://gerrit.opencord.org/gitweb?p=openolt.git;a=tree;h=refs/heads/voltha-2.9>`_ - ``3.6.2``
+- `voltha-protos <https://github.com/opencord/voltha-protos/releases/tag/v5.1.2>`_ - ``5.1.2``
+- `voltha-lib-go <https://github.com/opencord/voltha-lib-go/releases/tag/v7.1.3>`_ - ``7.1.3``
+- `Bbsim-sadis-server <https://github.com/opencord/bbsim-sadis-server/releases/tag/v0.3.2>`_ - ``0.3.2`` with chart ``0.2.3``
+- `voltha-system-tests <https://github.com/opencord/voltha-system-tests/releases/tag/2.9.0>`_ - ``2.9.0``
+
+
+Helm Chart Versions:
+++++++++++++++++++++
+This section refers to the macro charts to deploy the required infrastructure and a (or many) VOLTHA stacks:
+- Voltha-infra: ``2.9.11``
+- Voltha-stack: ``2.9.15``
+
+BAL Version:
+++++++++++++
+Broadcom abstraction layer (BAL) version: ``3.10.2.2``.
+
+Openolt Agent packages:
++++++++++++++++++++++++
+**EdgeCore**
+Get access credentials for https://edgecore.quickconnect.to from Edgecore.
+Then login and navigate to ``File_Station`` -> ``EdgecoreNAS``, and then the folder
+``/ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/voltha-2.9`` or
+``/ASGvOLT64/OpenOLT_Agent/From_ONF_Distribution/voltha-2.9`` based on ``ASXvOLT16`` or ``ASGvOLT64`` platform,
+and pick the suitable OLT debian package based on ``BAL 3.10.2.2`` applicable for you.
+Please make sure to use the ONL
+``/ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/ONL-onl-4.14_ONL-OS8_2021-11-26.0058-0de1c30_AMD64_INSTALLED_INSTALLER``
+for running ``BAL 3.10.2.2``.
+
+**Radisys**
+Please write to `Cameron Lundberg <cameron.lundberg@radisys.com>`_ with `Girish Gowdra <cameron.lundberg@radisys.com>`_
+to get the OLT debian package validated on 3200G, 1600x and 1600G platforms for VOLTHA-2.9 release
+