Zeus Kerravala
Zeus Kerravala is the founder and principal analyst with ZK Research. Kerravala provides a mix of tactical advice to help his...
Read Full Bio >>

Zeus Kerravala | March 14, 2017 |


SD-WAN: Right for the Cloud Era?

SD-WAN: Right for the Cloud Era? As compelling as this network option might be, some questions need further exploration.

As compelling as this network option might be, some questions need further exploration.

Not only has WAN transformation been talked about for decades, but SD-WAN in particular has been a red-hot topic for the last couple of years. Investors seem to believe the market will stay this way as well; over the past couple of months both VeloCloud and Aryaka have raised additional funds to be able to meet the explosion in user demand for SD-WAN.

One of the core tenets of my research is that the best opportunity to gain customer share is when markets undergo transitions, which is why we see so much startup activity in this market right now.

Why Is the WAN in Transition?
That's an easy answer. Legacy WANs are broken and have been for decades. Prior to becoming an analyst I was in corporate IT, and back in the '90s we discussed WAN transformation. However, unlike today, there really wasn't a viable alternative at the time. Also, traditional WANs were inflexible, inefficient, and overly expensive. It wasn't holding the business back so most IT departments took an "if it ain't broke, don't fix it" attitude regarding the wide area network.

Today, the world is quite different. The cloud has completely changed WAN traffic patterns so legacy WANs are indeed having an impact on worker performance. Understanding why requires some knowledge of different compute models.

A decade ago client server computing was dominant. With this model, data is stored in the company data center and then accessed by workers in branch offices. A legacy network uses a hub-and-spoke design where the data center is the hub and branch offices are connected via the spokes. So from this perspective, the network architecture was actually optimal. The problem was that managing the network was done one box at a time, and it could take forever to make even simple changes.

Additionally, hub and spoke is sub-optimal for the Internet as traffic flows from the Internet into the hub location and then to the branch via one of the spokes. The traffic will then "trombone" at the branch, and then head back down the same spoke, back through the hub, and then out to the Internet. With this architecture, Internet traffic is passed over the company WAN twice, using much more bandwidth than is necessary. During the client server era, Internet traffic was best effort in nature and made up only a small percentage of network traffic, so businesses put up with the inefficiencies of this model.

Fast-forward a decade and the use of cloud has exploded. CRM, ERP, UC, contact center, productivity apps, storage, servers -- you name it, it's available in the cloud. Many organizations today have a mandate to be cloud first whenever possible, driving Internet traffic to all-time highs. The trombone effect can negatively impact application performance, causing companies to need to upgrade their WANs -- a very expensive task if MPLS is the primary technology in place.

SD-WAN to the Rescue
The SD-WAN can be a panacea for the network by lowering costs and improving user experience as it brings an entirely new architecture.

With an SD-WAN, a high-price MPLS network can be augmented or replaced with broadband, which is much lower cost. However, the thought of using broadband for business connectivity gives many network managers the heebie-jeebies, so most SD-WAN vendors promote the concept of a hybrid WAN where MPLS and broadband are both active. The concept is to have mission-critical or real-time apps like VoIP and video use the private IP service, with best effort traffic like many cloud apps going directly to the Internet over broadband -- at least that's the theory.

As compelling as SD-WANs are, there are some questions that deserve exploring further. Here are the top issues that I hear about from customers with respect with making the leap to this new network:

  • For global or even national organizations, there is no nation-wide broadband provider. In fact, by my calculations, there are over 800 broadband providers in the U.S. alone. How should large companies choose the best broadband provider(s) to meet their needs?
  • Broadband performance can vary quite widely by type of network (DSL, Cable, or Ethernet) or even time of day depending on the congestion level. What should the expectation be with using broadband for business purposes?
  • SD-WANs and data center SDNs are often treated as separate silos. Is this the best approach, or should businesses look at a larger SDN strategy that encompasses the data center all the way to the branch edge?
  • Making any kind of change to a network can be disruptive, particularly in a world that is becoming more dependent on it. What are the best ways to migrate to an SD-WAN while minimizing risks?
  • There are many technologies that fall under the overall umbrella of an SD-WAN, such as WAN optimization, path selection, QoS, Network Functions Virtualization (NFV), and others. Which of these does a business need today?

Answering these questions isn't easy, but I'll be attempting to do so during my panel on the topic at Enterprise Connect, coming up March 27 - 30 in Orlando. I'll be joined on stage by Jason Gadsby, Director of Enterprise Networking at AT&T; Sanjay Srinivasan, VP and Chief Technology Architect Business Engineering at Vonage; Fabrizio Fiori, Global Director, Enterprise Business Solutions, Office of the CTO, Avaya; and Michael Wood, VP of Marketing at VeloCloud Networks.

The panel, "SD-WAN: Why It's the Right Fit for the Cloud Era," will be at 8 a.m. on Tuesday, March 28th; so get up early and come join us to get answers to the above questions and many more.

Learn more about systems management and network design trends and technologies at Enterprise Connect 2017, March 27 to 30, in Orlando, Fla. View the Systems Management & Network Design track, and register now using the code NOJITTER to receive $300 off an Entire Event pass or a free Expo Plus pass.

Follow Zeus Kerravala on Twitter and Google+!
Zeus Kerravala on Google+


October 24, 2018

With disparate workplaces and ever-expanding volumes of information to manage, the challenges for collaborating effectively are only intensifying. Many critical applications are not integrated, and

October 10, 2018

Businesses are growing across international borders quicker than ever, but scaling operations to follow suit can be a harder, longer process.

This webinar focuses on scaling your next-generat

September 26, 2018

Join Kevin Kieller, Microsoft UC&C expert, along with Ribbon Communications and Polycom, for an update on Microsoft Ignite, and a focus on critical things you need to know about your voice deployme

March 12, 2018
An effective E-911 implementation doesn't just happen; it takes a solid strategy. Tune in for tips from IT expert Irwin Lazar, of Nemertes Research.
March 9, 2018
IT consultant Steve Leaden lays out the whys and how-tos of getting the green light for your convergence strategy.
March 7, 2018
In advance of his speech tech tutorial at EC18, communications analyst Jon Arnold explores what voice means in a post-PBX world.
February 28, 2018
Voice engagement isn't about a simple phone call any longer, but rather a conversational experience that crosses from one channel to the next, as Daniel Hong, a VP and research director with Forrester....
February 16, 2018
What trends and technologies should you be up on for your contact center? Sheila McGee-Smith, Contact Center & Customer Experience track chair for Enterprise Connect 2018, gives us the lowdown.
February 9, 2018
Melanie Turek, VP of connected work research at Frost & Sullivan, walks us through key components -- and sticking points -- of customer-oriented digital transformation projects.
February 2, 2018
UC consultant Marty Parker has crunched lots of numbers evaluating UC options; tune in for what he's learned and tips for your own analysis.
January 26, 2018
Don't miss out on the fun! Organizer Alan Quayle shares details of his pre-Enterprise Connect hackathon, TADHack-mini '18, showcasing programmable communications.
December 20, 2017
Kevin Kieller, partner with enableUC, provides advice on how to move forward with your Skype for Business and Teams deployments.
December 20, 2017
Zeus Kerravala, principal analyst with ZK Research, shares his perspective on artificial intelligence and the future of team collaboration.
December 20, 2017
Delanda Coleman, Microsoft senior marketing manager, explains the Teams vision and shares use case examples.
November 30, 2017
With a ruling on the FCC's proposed order to dismantle the Open Internet Order expected this month, communications technology attorney Martha Buyer walks us through what's at stake.
October 23, 2017
Wondering which Office 365 collaboration tool to use when? Get quick pointers from CBT Nuggets instructor Simona Millham.
September 22, 2017
In this podcast, we explore the future of work with Robert Brown, AVP of the Cognizant Center for the Future of Work, who helps us answer the question, "What do we do when machines do everything?"
September 8, 2017
Greg Collins, a technology analyst and strategist with Exact Ventures, delivers a status report on 5G implementation plans and tells enterprises why they shouldn't wait to move ahead on potential use ....
August 25, 2017
Find out what business considerations are driving the SIP trunking market today, and learn a bit about how satisfied enterprises are with their providers. We talk with John Malone, president of The Ea....
August 16, 2017
World Vision U.S. is finding lots of goodness in RingCentral's cloud communications service, but as Randy Boyd, infrastructure architect at the global humanitarian nonprofit, tells us, he and his team....
August 11, 2017
Alicia Gee, director of unified communications at Sutter Physician Services, oversees the technical team supporting a 1,000-agent contact center running on Genesys PureConnect. She catches us up on th....
August 4, 2017
Andrew Prokop, communications evangelist with Arrow Systems Integration, has lately been working on integrating enterprise communications into Internet of Things ecosystems. He shares examples and off....
July 27, 2017
Industry watcher Elka Popova, a Frost & Sullivan program director, shares her perspective on this acquisition, discussing Mitel's market positioning, why the move makes sense, and more.
July 14, 2017
Lantre Barr, founder and CEO of Blacc Spot Media, urges any enterprise that's been on the fence about integrating real-time communications into business workflows to jump off and get started. Tune and....
June 28, 2017
Communications expert Tsahi Levent-Levi, author of the popular blog, keeps a running tally and comprehensive overview of communications platform-as-a-service offerings in his "Choosing a W....
June 9, 2017
If you think telecom expense management applies to nothing more than business phone lines, think again. Hyoun Park, founder and principal investigator with technology advisory Amalgam Insights, tells ....
June 2, 2017
Enterprises strategizing on mobility today, including for internal collaboration, don't have the luxury of learning as they go. Tony Rizzo, enterprise mobility specialist with Blue Hill Research, expl....
May 24, 2017
Mark Winther, head of IDC's global telecom consulting practice, gives us his take on how CPaaS providers evolve beyond the basic building blocks and address maturing enterprise needs.
May 18, 2017
Diane Myers, senior research director at IHS Markit, walks us through her 2017 UC-as-a-service report... and shares what might be to come in 2018.
April 28, 2017
Change isn't easy, but it is necessary. Tune in for advice and perspective from Zeus Kerravala, co-author of a "Digital Transformation for Dummies" special edition.
April 20, 2017
Robin Gareiss, president of Nemertes Research, shares insight gleaned from the firm's 12th annual UCC Total Cost of Operations study.
March 23, 2017
Tim Banting, of Current Analysis, gives us a peek into what the next three years will bring in advance of his Enterprise Connect session exploring the question: Will there be a new model for enterpris....
March 15, 2017
Andrew Prokop, communications evangelist with Arrow Systems Integration, discusses the evolving role of the all-important session border controller.
March 9, 2017
Organizer Alan Quayle gives us the lowdown on programmable communications and all you need to know about participating in this pre-Enterprise Connect hackathon.
March 3, 2017
From protecting against new vulnerabilities to keeping security assessments up to date, security consultant Mark Collier shares tips on how best to protect your UC systems.
February 24, 2017
UC analyst Blair Pleasant sorts through the myriad cloud architectural models underlying UCaaS and CCaaS offerings, and explains why knowing the differences matter.
February 17, 2017
From the most basics of basics to the hidden gotchas, UC consultant Melissa Swartz helps demystify the complex world of SIP trunking.
February 7, 2017
UC&C consultant Kevin Kieller, a partner at enableUC, shares pointers for making the right architectural choices for your Skype for Business deployment.
February 1, 2017
Elka Popova, a Frost & Sullivan program director, shares a status report on the UCaaS market today and offers her perspective on what large enterprises need before committing to UC in the cloud.
January 26, 2017
Andrew Davis, co-founder of Wainhouse Research and chair of the Video track at Enterprise Connect 2017, sorts through the myriad cloud video service options and shares how to tell if your choice is en....
January 23, 2017
Sheila McGee-Smith, Contact Center/Customer Experience track chair for Enterprise Connect 2017, tells us what we need to know about the role cloud software is playing in contact centers today.