More than 10 years have now elapsed since the beginning of Software-Defined Networking (SDN). Over the course of a decade, SDN has fueled incredible innovation, revolutionizing virtually all networking areas. SDN is now deployed in a growing number of production and experimental settings, including data centers, enterprise networks, content providers, and Internet Service Providers.

At its core, SDN revisits the relationship between the network hardware and the software that controls it. Through programming interfaces, SDN enables specifying and provisioning network-wide forwarding behaviors, as well as adapting how the network hardware itself forwards traffic. SDN has enabled more flexible and predictable network control, and makes it easier to extend the network with new functionality.

The Symposium on SDN Research (SOSR) is the premiere venue for research publications on SDN, building on past years' successful SOSR and HotSDN (Hot Topics in Software Defined Networking) workshops. Similarly to previous years, SOSR will be co-­located with the Open Networking Summit (organized this year in Los Angeles) to foster interaction between academic and industrial attendees. Attendees of each event will be able to access selected sessions in the other event.

We invite researchers and practitioners to submit both long and short previously unpublished papers, choosing the length appropriate to the level of completeness and detail in the work. We particularly encourage position papers, radical ideas, and papers on building, deploying and operating SDN systems.