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+VOLTHA 2.6 Release Notes
+========================
+
+Highlights
+----------
+
+The release of VOLTHA-2.6 and ONOS 2.2.7 comes with two major accomplishments.
+
+First, the move of a key VOLTHA component - the openonu adapter - from python to golang, nearly a year long effort,
+has come to fruition in this release. The outstanding performance of the new adapter makes it possible to run only a
+single instance of the adapter (in a VOLTHA stack) to do the job that took 8 instances of the python version.
+The golang version also paves the way for features such as ONU software upgrade to be implemented in upcoming releases.
+With this release, we deprecate the python version, which will no longer be supported in future releases.
+
+Second, this release significantly improves the scale of a VOLTHA pod to up to 10k subscribers in steady-state,
+where a VOLTHA pod is a collection of VOLTHA stacks interacting with shared infrastructure of ONOS, etcd and Kafka
+clusters. This represents a 10X improvement in scale over previous releases for all three operator workflows.
+Several factors contributed to the improvement including scale-optimizations in a single VOLTHA stack, streamlining
+and parallelization in ONOS apps, the aforementioned move to the golang openonu adapter, as well as changes that
+allowed the deployment of multiple VOLTHA stacks to share common infrastructure.
+
+Additional highlights include a new transactional error model between VOLTHA core and adapters, and a move in
+the Helm charts for ETCD and KAFKA from incubator to upstream versions from BITNAMI.
+
+Along with VOLTHA 2.6, the Device Management Brigade also released a new version of the interface, which has been
+implemented on BBSIM and has initial robot test cases.
+
+
+Features & Improvements
+-----------------------
+
+- OpenONU GO feature complete and used as default
+- BBSim Sadis server rewritten in Golang
+- Flow replication in the openolt agent instead of the openolt adapter
+- Parallelization and scale hardening of ONOS apps (aaa, dhcpl2relay)
+- Multiple thread processing and offloading
+  - Refactored AAA Statistic names
+  - Packet cloning and flow objective ordering in the DhcpL2Relay
+  - Per OLT pending queues
+  - Use of Option 82 in DHCP to carry around the access-port/vlan of the subscriber.
+- Device Management Interface example server on top of BBSim
+- Force delete of a device
+- Move to upstream charts from BITNAMI for etcd and kafka
+- OMCC encryption support
+- OLT software upgrade support (in-band mode only)
+- Migration to BAL 3.4.9.6
+
+
+Development/Deployment process
+------------------------------
+
+- Multi-stack support in kind-voltha and across the components
+
+Test
+----
+
+Voltha-2.6 tests are available on `Jenkins <https://jenkins.opencord.org/view/VOLTHA-2.6/>`_.
+
+- Multi-OLT tests with a single voltha stack on Physical Hardware and BBSim
+- Use of the full suite of tests for openonu-go, both on hardware and BBSim
+- New specific tests for openonu-go
+- | Multi-stack scale tests, up to 10 VOLTHA stacks enabled one at a time on the three workflows for a total of
+  | 10240 ONUs supported in a single VOLTHA pod
+
+  - | Maximum of 1k ONUs on a single VOLTHA stack. Tests were performed with 2 OLTs with 512 ONUs each on a single
+    | stack, but other combinations are possible, for example 5 OLTs with 200 ONUs each.
+  - Scale tests were performed on 3 physical servers (each one 32 cores Intel(R) Xeon(R) CPU D-1587 @ 1.70GHz,
+    | 132GB RAM, 120GB SSD) deploying a common infrastructure a 3 node ONOS cluster, a 3 note ETCD cluster and a 3 node
+    | kafka with zookeeper cluster and then 10 VOLTHA stacks comprised of of-agent, core, olt and onu adapter.
+
+- Initial Device management interface tests.
+
+
+Design Discussions
+------------------
+
+- PPPoE contribution over VOLTHA (Furukawa)
+- MPLS Pseudowire at the OLT (DT)
+- Software upgrade (ONF, Ciena, Community)
+- Preparation for EPON support (NTT and Furukawa Electric)
+
+
+Documentation
+-------------
+
+- Updated documentation with workflow specific orientation and published on https://docs.voltha.org
+
+Known Issues
+------------
+
+- `VOL-3542 <https://jira.opencord.org/browse/VOL-3542>`_: Missing Mib Audit from the new openonu go adapter.
+- `VOL-3709 <https://jira.opencord.org/browse/VOL-3709>`_: Scale tests were performed with the etcd incubator charts
+- `VOL-3708 <https://jira.opencord.org/browse/VOL-3708>`_: Scale test results do not include multicast in TT workflow
+- `VOL-3707 <https://jira.opencord.org/browse/VOL-3707>`_: Support for Multiple instances of the openonu go adapter
+- `VOL-3732 <https://jira.opencord.org/browse/VOL-3732>`_: Non-zero pbit traffic dropped in the downstream direction
+  in ATT workflow.
+
+Certification Program
+---------------------
+
+Thanks to the `Continuous Certification <https://opennetworking.org/continuous-certification-program>`_ program at
+ONF we can also ensure that the following devices are compatible with the VOLTHA 2.6 release:
+- Edgecore ASGVolt64 GPON OLT
+- Edgecore ASXVolt16 XGSGPON OLT
+- Sercomm F1000 GPON ONU
+- Edgecore 6712-32X Switch
+- Edgecore 7712-32X Switch
+
+VOLTHA 2.6 is also tested with other brands, such as Alpha, Iskratel, Tibit but they are not enrolled in the
+continuous certification program thus do not appear in the list.
+
+
+Jira stories
+------------
+A full list of stories and bugs completed can be found under the
+`VOLTHA 2.6 <https://jira.opencord.org/secure/ReleaseNote.jspa?projectId=10106&version=11900>`_ release page in Jira.
+
+Component Versions in VOLTHA 2.6 release
+----------------------------------------
+
+ONOS:
+++++++++++
+
+- `ONOS 2.2 LTS <https://github.com/opennetworkinglab/onos/releases/tag/2.2.7>`_: ``2.2.7``
+
+ONOS Apps:
+++++++++++
+
+- `aaa <https://gerrit.opencord.org/gitweb?p=aaa.git;a=summary>`_: ``2.2.0``
+- `dhcpl2relay <https://gerrit.opencord.org/gitweb?p=dhcpl2relay.git;a=summary>`_: ``2.3.0``
+- `igmpproxy <https://gerrit.opencord.org/gitweb?p=igmpproxy.git;a=summary>`_: ``2.1.2``
+- `kafka <https://gerrit.opencord.org/gitweb?p=kafka-onos.git;a=summary>`_: ``2.5.0``
+- `mcast <https://gerrit.opencord.org/gitweb?p=mcast.git;a=summary>`_: ``2.1.0``
+- `olt <https://gerrit.opencord.org/gitweb?p=olt.git;a=summary>`_: ``4.3.0``
+- `sadis <https://gerrit.opencord.org/gitweb?p=sadis.git;a=summary>`_: ``5.2.0``
+
+VOLTHA Components:
+++++++++++++++++++
+
+- `Helm Charts (voltha-helm-charts) <https://gerrit.opencord.org/gitweb?p=voltha-helm-charts.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``2.6.0``
+- `bbsim <https://gerrit.opencord.org/gitweb?p=bbsim.git;a=tree>`_- ``1.4.2`` with `chart <https://gerrit.opencord.org/gitweb?p=helm-charts.git;a=tree;f=bbsim>`_ ``4.1.6``
+- `voltha-go <https://gerrit.opencord.org/gitweb?p=voltha-go.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``2.6.3`` with chart ``2.7.2``
+- `ofagent-go <https://gerrit.opencord.org/gitweb?p=ofagent-go.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``1.4.2``  with chart ``2.7.2``
+- `voltctl <https://gerrit.opencord.org/gitweb?p=voltctl.git;a=tree>`_ - ``1.3.1``
+- `voltha-openolt-adapter <https://gerrit.opencord.org/gitweb?p=voltha-openolt-adapter.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``3.0.2`` with chart ``2.7.1``
+- `voltha-openonu-adapter-go <https://gerrit.opencord.org/gitweb?p=voltha-openonu-adapter-go.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``1.0.0`` with chart ``2.6.10``
+- `voltha-openonu-adapter <https://github.com/opencord/voltha-openonu-adapter/releases/tag/2.6.0>`_ - ``2.6.0`` with chart ``2.6.10``
+- `voltha-onos <https://gerrit.opencord.org/gitweb?p=voltha-onos.git;a=tree;h=refs/heads/voltha-2.6>`_ -  ``4.2.0`` with chart ``0.1.11``
+- `openolt agent <https://gerrit.opencord.org/gitweb?p=openolt.git;a=tree;h=refs/heads/voltha-2.6>`_ - ``3.2.1``
+- `voltha-protos <https://github.com/opencord/voltha-protos/releases/tag/v4.0.5>`_ - ``4.0.5``
+- `voltha-lib-go <https://github.com/opencord/voltha-lib-go/releases/tag/v4.0.3>`_ - ``4.0.3``
+- `pyvoltha <https://github.com/opencord/pyvoltha/releases/tag/2.5.7>`_ - ``2.5.7``
+- `Bbsim-sadis-server <https://github.com/opencord/bbsim-sadis-server/releases/tag/v0.1.3>`_ - ``0.1.4`` with chart ``0.0.5``
+- `kind-voltha <https://gerrit.opencord.org/gitweb?p=kind-voltha.git>`_ -  ``6.0.0``
+
+**Available from EdgeCore site**
+
+- Out of band management
+
+  - ONL version (both GPON and XGSPON) ONL-onl-4.14_ONL-OS8_2020-04-14.1946-72b95a7_AMD64_INSTALLED_INSTALLER available
+    at /ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution
+  - for ASFVOLT16 available, from /ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/voltha-2.6/:
+
+    - ``openolt_asfvolt16-3.2.0-fc10f0d035181d3125ffc6e7a60bf5328fcf5bfa-100G-NNI.deb`` if 100G NNI port is used
+    - ``openolt_asfvolt16-3.2.0-fc10f0d035181d3125ffc6e7a60bf5328fcf5bfa-40G-NNI.deb`` if 40G NNI port is used.
+
+  - for ASGVOLT64 available at /ASGvOLT64/OpenOLT_Agent/From_ONF_Distribution/voltha-2.6:
+
+    - ``openolt_asgvolt64-3.2.0-fc10f0d035181d3125ffc6e7a60bf5328fcf5bfa-100G-NNI.deb`` if 100G NNI port is used
+    - ``openolt_asgvolt64-3.2.0-fc10f0d035181d3125ffc6e7a60bf5328fcf5bfa-40G-NNI.deb`` if 40G NNI port is used.
+
+- In band management
+
+  - use ONL image, comprising of Bal and openolt (available from edgecore site) for ASFVOLT16
+    ONL-onl-4.14_ONL-OS8_2020-11-22.1509-72b95a7_AMD64_INSTALLED_INSTALLER-40G-NNI,
+    available at /ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/voltha-2.6/IN-BAND.
+    Note that debian package available as part of the ONL support 40G NNI by default.
+
+
+Get access credentials for https://edgecore.quickconnect.to and then login
+and navigate to File_Station -> EdgecoreNAS, and then the folder
+/ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/ and pick the version above