|By Lori MacVittie||
|February 20, 2013 10:00 AM EST||
It's that time in the SDN hype cycle where people are beginning to lay out a more solid vision of what it means to them. Themes are beginning to emerge on the foundations laid by ONF that include the necessary separation of control and data (forwarding) planes, but some are still missing critical components - the ones that enable agility of the business, not just the network.
Juniper's Bob Muglia recently published a post called "Decoding SDN" that expounds upon Juniper's vision of SDN. It's a well written lengthy piece that's definitely worth a read if you not only want to understand Juniper's strategy but if you want to gain a bit more insight into how SDN is being approached.
One thing that jumped out at me was Bob's "Four Planes of Networking". Generally speaking it was an excellent distillation of the SDN concept. But something was missing, in my opinion. It did not adequately encapsulate the notion of how or where SDN enables one of its most important purported benefits: agility.
Let's review the basic definition of agility, shall we?
1.the power of moving quickly and easily; nimbleness: exercises demanding agility.
A fairly nebulous definition and Bob's description of the four planes of networking certainly can be construed to fulfill the requirements of agility. After all, merely separating control from data (forwarding) plane combined with a standardized management plane enables a fair amount of agility in the network, certainly more than what existed before the concept of SDN began disrupting the entire networking community.
But agility isn't just about being able to rapidly change forwarding tables, it's about being able to respond to operational and business conditions. It's about being able to implement new functionality, if necessary, that enables innovative business ideas to be realized in the network, which almost always must deliver that business idea to customers, employees, or partners.
What I found missing from Bob's discussion was programmability of the network, that is, not just the ability to programmatically modify configuration, but to programmatically modify the behavior (and thus the delivery mechanisms) of the network.
Bob's diagram and explanation (shortened for brevity):
The Four Planes of Networking
Inside every networking and security device – every switch, router, and firewall - you can separate the software into four layers or planes. As we move to SDN, these planes need to be clearly understood and cleanly separated. This is absolutely essential in order to build the next generation, highly scalable network.
Forwarding. The bottom plane, Forwarding, does the heavy lifting of sending the network packets on their way.
Control. If the Forwarding plane is the brawn of the network, Control is the brains. The Control plane understands the network topology and makes the decisions on where the flow of network traffic should go.
Services. Sometimes network traffic requires more processing and for this, the Services plane does the job. Not all networking devices have a Services plane – you won’t find this plane in a simple switch. But for many routers and all firewalls, the Services plane does the deep thinking, performing the complex operations on networking data that cannot be accomplished by the Forwarding hardware. Services are the place where firewalls stop the bad guys and parental controls are enforced.
Management. Like all computers, network devices need to be configured, or managed. The Management plane provides the basic instructions of how the network device should interact with the rest of the network.
I hope Bob does not take it amiss if I modify and expand upon his network plane diagram.
First, I think management should not be portrayed as part of the network planes. It's not part of the network - not really - nor should it be. The separation of management from network plane as a matter of technical architecture and implementation is well-established as a best practice to ensure continued access to devices that have failed or are overwhelmed. I don't think Bob's intention was to imply the management plane was coupled to the network plane in such a manner, but diagrams using an east or west-bound management placement tend to disseminate the actual separation a bit better, so I've moved it off to the side and broadened it to ensure it covers not only control but services as well.
Which is the next layer I think needs some expansion.
A SERVICE FRAMEWORK
One of the core premises of SDN is the ability to programmatically extend the functionality of the "network" through plug-ins, add-ons, or applications - whatever you want to call them, they're the same thing - I'm going to refer to them as services as I think Bob took the right approach with the service nomenclature. But rather than use the all encompassing "services" I think we should view that layer as a service framework, upon which new services can be deployed - whether through plug-ins or a direct programmatic interface or through a less coupled API. However it occurs, a set of base network services are available in the framework that can be extended. That's where additional value is added, where new network functionality is deployed, and what makes it possible to use the same network "equipment" to deploy a variety of functions. The same "equipment" should be distilled down to a common set of networking services but be able to support firewall services on one, application acceleration on another, and load balancing on yet another.
This concept draws from the idea of a platform in the development world. Developers do not write their own network stacks, or even application-transport (HTTP) stacks. They develop functionality atop a common framework that enables them to modify behavior such that a highly secure, banking application can be deployed on the same common platform as a completely open picture sharing application. The platform is deployed, managed, configured and operated in the same way but the applications, ah, the applications have very different profiles.
The same concept must be applied to the network and to SDN-enabled solutions. It's not enough to provide separation of control and forwarding to enable agility. To enable true agility requires the inclusion of a services platform capable of extending functionality without introducing additional operational overhead into the core "stack".
There's a lot more in Bob's discussion, including an interesting view of "SDN Chaining" which I will not get into here because this is long enough that your coffee is likely cold by now. Suffice it to say it's an interesting read and I find valuable nuggets in his discussion and think such posts are necessary to start really figuring out where this SDN thing is going to go.
Microservices are a very exciting architectural approach that many organizations are looking to as a way to accelerate innovation. Microservices promise to allow teams to move away from monolithic "ball of mud" systems, but the reality is that, in the vast majority of organizations, different projects and technologies will continue to be developed at different speeds. How to handle the dependencies between these disparate systems with different iteration cycles? Consider the "canoncial problem" ...
Feb. 27, 2017 06:00 AM EST Reads: 6,144
After more than five years of DevOps, definitions are evolving, boundaries are expanding, ‘unicorns’ are no longer rare, enterprises are on board, and pundits are moving on. Can we now look at an evolution of DevOps? Should we? Is the foundation of DevOps ‘done’, or is there still too much left to do? What is mature, and what is still missing? What does the next 5 years of DevOps look like? In this Power Panel at DevOps Summit, moderated by DevOps Summit Conference Chair Andi Mann, panelists l...
Feb. 27, 2017 05:00 AM EST Reads: 7,404
When building DevOps or continuous delivery practices you can learn a great deal from others. What choices did they make, what practices did they put in place, and how did they connect the dots? At Sonatype, we pulled together a set of 21 reference architectures for folks building continuous delivery and DevOps practices using Docker. Why? After 3,000 DevOps professionals attended our webinar on "Continuous Integration using Docker" discussing just one reference architecture example, we recogn...
Feb. 27, 2017 04:00 AM EST Reads: 2,770
Hardware virtualization and cloud computing allowed us to increase resource utilization and increase our flexibility to respond to business demand. Docker Containers are the next quantum leap - Are they?! Databases always represented an additional set of challenges unique to running workloads requiring a maximum of I/O, network, CPU resources combined with data locality.
Feb. 27, 2017 03:00 AM EST Reads: 2,286
Thanks to Docker and the DevOps revolution, microservices have emerged as the new way to build and deploy applications — and there are plenty of great reasons to embrace the microservices trend. If you are going to adopt microservices, you also have to understand that microservice architectures have many moving parts. When it comes to incident management, this presents an important difference between microservices and monolithic architectures. More moving parts mean more complexity to monitor an...
Feb. 27, 2017 02:00 AM EST Reads: 1,806
In recent years, containers have taken the world by storm. Companies of all sizes and industries have realized the massive benefits of containers, such as unprecedented mobility, higher hardware utilization, and increased flexibility and agility; however, many containers today are non-persistent. Containers without persistence miss out on many benefits, and in many cases simply pass the responsibility of persistence onto other infrastructure, adding additional complexity.
Feb. 27, 2017 01:15 AM EST Reads: 1,682
Docker containers have brought great opportunities to shorten the deployment process through continuous integration and the delivery of applications and microservices. This applies equally to enterprise data centers as well as the cloud. In his session at 20th Cloud Expo, Jari Kolehmainen, founder and CTO of Kontena, will discuss solutions and benefits of a deeply integrated deployment pipeline using technologies such as container management platforms, Docker containers, and the drone.io Cl tool...
Feb. 26, 2017 10:45 PM EST Reads: 2,429
The rise of containers and microservices has skyrocketed the rate at which new applications are moved into production environments today. While developers have been deploying containers to speed up the development processes for some time, there still remain challenges with running microservices efficiently. Most existing IT monitoring tools don’t actually maintain visibility into the containers that make up microservices. As those container applications move into production, some IT operations t...
Feb. 26, 2017 10:15 PM EST Reads: 1,504
In 2014, Amazon announced a new form of compute called Lambda. We didn't know it at the time, but this represented a fundamental shift in what we expect from cloud computing. Now, all of the major cloud computing vendors want to take part in this disruptive technology. In his session at 20th Cloud Expo, John Jelinek IV, a web developer at Linux Academy, will discuss why major players like AWS, Microsoft Azure, IBM Bluemix, and Google Cloud Platform are all trying to sidestep VMs and containers...
Feb. 26, 2017 05:30 PM EST Reads: 2,343
As Enterprise business moves from Monoliths to Microservices, adoption and successful implementations of Microservices become more evident. The goal of Microservices is to improve software delivery speed and increase system safety as scale increases. Documenting hurdles and problems for the use of Microservices will help consultants, architects and specialists to avoid repeating the same mistakes and learn how and when to use (or not use) Microservices at the enterprise level. The circumstance w...
Feb. 26, 2017 03:45 PM EST Reads: 1,802
SYS-CON Events announced today that CA Technologies has been named “Platinum Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business – from apparel to energy – is being rewritten by software. From ...
Feb. 26, 2017 03:45 PM EST Reads: 2,776
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, Cloud Expo and @ThingsExpo are two of the most important technology events of the year. Since its launch over eight years ago, Cloud Expo and @ThingsExpo have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, I provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading the...
Feb. 26, 2017 03:30 PM EST Reads: 9,064
This week's news brings us further reminders that if you're betting on cloud, you're headed in the right direction. The cloud is growing seven times faster than the rest of IT, according to IDC, with a 25% spending increase just from 2016 to 2017. SaaS still leads the pack, with an estimated two-thirds of public cloud spending going that way. Large enterprises, with more than 1,000 employees, are predicted to account for more than half of cloud spending and have the fastest annual growth rate.
Feb. 26, 2017 02:45 PM EST Reads: 1,192
Microservices (μServices) are a fascinating evolution of the Distributed Object Computing (DOC) paradigm. Initial design of DOC attempted to solve the problem of simplifying developing complex distributed applications by applying object-oriented design principles to disparate components operating across networked infrastructure. In this model, DOC “hid” the complexity of making this work from the developer regardless of the deployment architecture through the use of complex frameworks, such as C...
Feb. 26, 2017 01:45 PM EST Reads: 1,710
@DevOpsSummit at Cloud taking place June 6-8, 2017, at Javits Center, New York City, is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long developm...
Feb. 26, 2017 12:30 PM EST Reads: 2,061
DevOps and microservices are permeating software engineering teams broadly, whether these teams are in pure software shops but happen to run a business, such Uber and Airbnb, or in companies that rely heavily on software to run more traditional business, such as financial firms or high-end manufacturers. Microservices and DevOps have created software development and therefore business speed and agility benefits, but they have also created problems; specifically, they have created software securi...
Feb. 26, 2017 11:00 AM EST Reads: 4,187
In today's enterprise, digital transformation represents organizational change even more so than technology change, as customer preferences and behavior drive end-to-end transformation across lines of business as well as IT. To capitalize on the ubiquitous disruption driving this transformation, companies must be able to innovate at an increasingly rapid pace. Traditional approaches for driving innovation are now woefully inadequate for keeping up with the breadth of disruption and change facing...
Feb. 26, 2017 10:45 AM EST Reads: 8,211
SYS-CON Events announced today that Outlyer, a monitoring service for DevOps and operations teams, has been named “Bronze Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Outlyer is a monitoring service for DevOps and Operations teams running Cloud, SaaS, Microservices and IoT deployments. Designed for today's dynamic environments that need beyond cloud-scale monitoring, we make monitoring effortless so you...
Feb. 26, 2017 10:30 AM EST Reads: 2,483
Cloud Expo, Inc. has announced today that Andi Mann and Aruna Ravichandran have been named Co-Chairs of @DevOpsSummit at Cloud Expo 2017. The @DevOpsSummit at Cloud Expo New York will take place on June 6-8, 2017, at the Javits Center in New York City, New York, and @DevOpsSummit at Cloud Expo Silicon Valley will take place Oct. 31-Nov. 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Feb. 26, 2017 10:15 AM EST Reads: 2,476
All clouds are not equal. To succeed in a DevOps context, organizations should plan to develop/deploy apps across a choice of on-premise and public clouds simultaneously depending on the business needs. This is where the concept of the Lean Cloud comes in - resting on the idea that you often need to relocate your app modules over their life cycles for both innovation and operational efficiency in the cloud. In his session at @DevOpsSummit at19th Cloud Expo, Valentin (Val) Bercovici, CTO of Soli...
Feb. 26, 2017 08:45 AM EST Reads: 1,452