Earlier this month, I attended the first ever summit on OpenDaylight (ODL) project in Santa Clara, CA. This near sold out event was largely successful by many standards. It brought together a large number of great minds to the table to solve some of the toughest challenges the networking industry is facing around Software-defined Networking (SDN) and Network Function Virtualization (NFV). The group announced a first major step forward with the first open source software release called Hydrogen. The bulk of the credit goes to 154 contributors from Cisco, IBM, Ericsson, Red Hat, Citrix and others who wrote over a million lines of code in past ten months to make this happen.
The two-day summit was packed with a variety of sessions that were geared towards a diverse set of audience. The sessions varied from general topics to specific topics such as relevance of Open source software, NFV, LISP, standards, discussions on North and South bound APIs, developer tutorials for building applications & tool chain, using OpenStack with ODL, analytics, test automation, and a true story of SDN in production environment.
Of all these topics, here are the three important themes that stood out to me -
1. The importance of an Open Source, community initiative for SDN
The concept of Open Source software has been around since decades. It is fast catching up in the non-traditional realms of computer networking. For some, the concept of open source equates to free software. While this is partially true, I strongly believe that open=free is a misnomer. I have started to realize that open source and further, the collaborative initiatives like ODL is far beyond the notion of freeness. In my view, the most important thing that such an initiative does is to gather right minds to bring out bright ideas. The collective wisdom that emanates from such a collaborative initiative helps vendors develop a cohesive set of products that speaks a common language, and perhaps share certain fundamental design constructs to aid interoperability. At the same time, I believe that this collaboration helps to compress the infinite ways vendors can built products to a bounded, agreed upon set of behaviors and interfaces. Customers are real beneficiaries of such an open initiative due to this standardization and better product interoperability. As Vijay Pandey from IBM aptly said in one of his presentations, open source initiatives like ODL “promote innovation and raise the value bar.”
Cisco firmly believes in and supports such open source initiatives. Cisco is a platinum member of ODL project, as well as a Gold member of OpenStack Foundation. You can find more information about OpenStack at Cisco , and a rich set of Cisco Services to help you exploit and adopt OpenStack.
2. What and how much to Standardize (North and South bound APIs)
In the summit, there were several interesting debates on what to standardize and how much. With regards to how much, I am with Guru Parulkar’s mantra to “standardize as little as possible.”
One of the core capabilities that SDN brings to the table is the notion around exposing interfaces from control plane to the infrastructure layer (South Bound APIs or SBI) and to the application/business layer (North bound APIs or NBI). We talked about using common approach for design constructs above, and the APIs are central to the constructs. However, if we (are somehow able to) standardize every hook into the system, we are forcing the industry to take a “single” approach to solve the underlying problems. Additionally, I believe that such an approach will not only go against the very notion of openness, but will also hinder innovation and ability to provide unique experiences.
If we talk about SBI, we rightly need some standardized ways to abstract some of the infrastructure complexities. I learnt that ODL will include support for SDN open standards such as OpenFlow, VxLAN, PCEP etc. Similar to SBI, can we standardize the NBI’s as well?