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gerrit.opencord.org / voltha / c400bed3fe9790f00629d0be5c157a66f1723b4f
commitc400bed3fe9790f00629d0be5c157a66f1723b4f[log] [tgz]
authorShad Ansari <shad@opennetworking.org>Tue Jul 03 07:42:52 2018 +0000
committerShad Ansari <shad@opennetworking.org>Tue Jul 03 07:42:52 2018 +0000
tree2b9e896b2f1ff916c846a3535e3e1af3b6e09ef4
parent905b840780917b14931ce9de8e200e8493fa39b4 [diff]
VOL-1030 Ignore bulk flow update if OLT is operational down.

This seems to fix voltha from 'hanging' when the openolt
driver is killed. Not entirely certain why - but it appears
that, when the gRPC connection is lost, the logical device's
state is made to be down. This causes ONOS to delete flows
trigerring the bulk flow update to the adapter. The adapter
attempts to make gRPC calls to the driver which fail after
connection timeouts. Likely twisted thread is busy with
the flow programming causing voltha to hang.

Change-Id: I9f07479f85ce2bf6cffe40c663581c013c897495
1 file changed
tree: 2b9e896b2f1ff916c846a3535e3e1af3b6e09ef4
  1. .dockerignore
  2. .gitignore
  3. .gitreview
  4. BUILD.md
  5. BuildingVolthaUsingVagrantOnKVM.md
  6. DOCKER_BUILD.md
  7. GettingStartedLinux.md
  8. Jenkinsfile
  9. LICENSE.txt
  10. Makefile
  11. README.md
  12. TODO.md
  13. Vagrantfile
  14. ansible/
  15. cli/
  16. common/
  17. compose/
  18. consul_config/
  19. dashd/
  20. docker/
  21. docs/
  22. env.sh
  23. envoy/
  24. experiments/
  25. fluentd_config/
  26. install/
  27. k8s/
  28. kafka/
  29. netconf/
  30. netopeer/
  31. nginx_config/
  32. obsolete/
  33. ofagent/
  34. pki/
  35. ponsim/
  36. portainer/
  37. reg_config/
  38. requirements.txt
  39. scripts/
  40. settings.vagrant.nightly-docker.yaml
  41. settings.vagrant.nightly.yaml
  42. settings.vagrant.yaml
  43. setup.mk
  44. setup.py
  45. shovel/
  46. tests/
  47. tmp_integration.md
  48. unum/
  49. vagrant-base/
  50. voltha/
README.md

VOLTHA

What is Voltha?

Voltha aims to provide a layer of abstraction on top of legacy and next generation access network equipment for the purpose of control and management. Its initial focus is on PON (GPON, EPON, NG PON 2), but it aims to go beyond to eventually cover other access technologies (xDSL, Docsis, G.FAST, dedicated Ethernet, fixed wireless).

Key concepts of Voltha:

  • Network as a Switch: It makes a set of connected access network devices to look like a(n abstract) programmable flow device, a L2/L3/L4 switch. Examples:
    • PON as a Switch
    • PON + access backhaul as a Switch
    • xDSL service as a Switch
  • Evolution to virtualization: it can work with a variety of (access) network technologies and devices, including legacy, fully virtualized (in the sense of separation of hardware and software), and in between. Voltha can run on a decice, on general purpose servers in the central office, or in data centers.
  • Unified OAM abstraction: it provides unified, vendor- and technology agnostic handling of device management tasks, such as service lifecycle, device lifecycle (including discovery, upgrade), system monitoring, alarms, troubleshooting, security, etc.
  • Cloud/DevOps bridge to modernization: it does all above while also treating the abstracted network functions as software services manageable much like other software components in the cloud, i.e., containers.

Why Voltha?

Control and management in the access network space is a mess. Each access technology brings its own bag of protocols, and on top of that vendors have their own interpretation/extension of the same standards. Compounding the problem is that these vendor- and technology specific differences ooze way up into the centralized OSS systems of the service provider, creating a lot of inefficiencies.

Ideally, all vendor equipment for the same access technology should provide an identical interface for control and management. Moreover, there shall be much higher synergies across technologies. While we wait for vendors to unite, Voltha provides an increment to that direction, by confining the differences to the locality of access and hiding them from the upper layers of the OSS stack.

How can you work with Voltha?

While we are still at the early phase of development, you can check out the BUILD.md file to see how you can build it, run it, test it, etc.

How can you help?

Contributions, small and large, are welcome. Minor contributions and bug fixes are always welcome in form of pull requests. For larger work, the best is to check in with the existing developers to see where help is most needed and to make sure your solution is compatible with the general philosophy of Voltha.