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OpenDaylight Introduces Nitrogen

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I am very pleased to announce the seventh OpenDaylight release, Nitrogen. We’ve done something a little bit different with this release.  First, we wanted to shorten the development time for this release so that we can better synchronize our future releases with OPNFV, Open Stack, and ONAP.  To that end Nitrogen arrives just over 3 months after Carbon.  Second, given this reduced development schedule, we’ve focused our efforts on a small number of key features requested by our users.

The primary focus for Nitrogen is the implementation of Karaf 4; the OpenDaylight component that allows the user to pick and choose what protocols and services their SDN controller will support.  With this update, OpenDaylight significantly improves the management of interdependencies between its component packages. This has three benefits from a user standpoint:

  • Overall platform performance. Because Karaf 4 generates and maintains a map of dependencies, both startup and new feature deployment can be much quicker, depending on your configuration.
  • ODL depends on 3rd party features that interact with parts of Karaf, but until the Nitrogen release, they were not covered by the Karaf security features.
  • The same dependency map that speeds deployments also makes it easier to track, isolate and discover breakdowns and errors.

Another benefit of moving to Karaf 4  is that it simplifies the integration of new features.  It does this by requiring the declaration of all feature interdependencies, as well as all the bundles a given feature contains, as part of the packaging process. Previously, ODL modules didn’t always require this information at startup, and instead the dependencies would be resolved on the fly.  From experience, the Karaf project and OpenDaylight recognized that this method was not 100% foolproof.  Therefore, the Nitrogen release cycle focused on making significant improvements in explicitly declaring these dependencies as part of the exercise of migrating our modules to Karaf 4.  The end results give developers and users a platform where all interactions between modules are explicitly defined and consistently executed. ODL Community member Ryan Goulding provides further details in this blog.

In addition to Karaf 4, significant effort has gone into improving the scalability, and robustness of OpenDaylight’s clustering capabilities.  Performance testing run in parallel with development surfaced feedback and new ideas that enhanced the Nitrogen release as well. Finally, small enhancements and bug fixes have been applied across the spectrum of components that make up OpenDaylight.

With these foundational improvements in place, OpenDaylight is well positioned to charge ahead with the Oxygen release, which will follow the traditional six-month cycle.

What’s next for OpenDaylight? We’ll continue to build capabilities to support active and emerging use cases in mobile carriers, webscale enterprises, cable operators, and IoT consumers from healthcare to utilities. The Design Forum for Oxygen is coming up on October 9-10 in Santa Clara, CA—join us to help define OpenDaylight’s next release.

Introducing The Linux Foundation’s Open Source Networking Days

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This post, by Arpit Joshipura, first appeared on

One of my primary goals at The Linux Foundation is to foster innovation across the entire open source networking ecosystem. This involves coordinating across multiple open source projects and initiatives and identifying key areas for collaboration to create an open source networking stack.

We are working across the entire ecosystem with industry-leading partners — from developers to service providers to vendors — to unify various open source components and create solutions that will accelerate network transformation. As part of this journey, I am pleased to introduce Open Source Networking Days (OSN Days), a series of free events that are hosted and organized by local user groups and The Linux Foundation members, with support from our projects, including DPDK,, ONAP, OpenDaylight, OPNFV, PNDA, and others.

OSN Days are a fantastic opportunity for network developers and users to learn how ONAP, OPNFV, OpenDaylight  and other open source initiatives are changing NFV/SDN orchestration and networking solutions. Stops on the tour include: ParisMilan, Stockholm, London, Tel Aviv, and Japan. Register today for an upcoming OSN Day in your region.

The day-long events will start with a plenary session where attendees will hear from site hosts and The Linux Foundation speakers on the state of the industry and the collaboration and touch points between projects that make up the open source networking stack. Presenters will also explore how business opportunities like 5G and IoT are enabled by network transformation.  In the afternoon, events may feature technical sessions, tutorials, demonstrations, and workshops that empower attendees to participate, contribute, and deepen their knowledge of open source networking.

Our first OSN Day kicks off October 9 in Paris, followed by stops in Milan (October 12), Stockholm (October 13), London (October 16), Tel Aviv (October 19), and Japan (October 19). Thanks to our incredible site hosts Amdocs, ATOS, Cloudify, Ericsson, Huawei, NEC, Orange, RedHat, SUSE and Vodafone, along with our high-caliber roster of speakers, for helping to make these OSN Days a reality!

More details about the events, including site-specific agendas, registration info, and details on hotel and travel, can be found here: If you have any questions, or would like to host an event yourself in the future, please email

 –Arpit Joshipura