|By Marten Terpstra||
|June 5, 2014 09:00 AM EDT||
A while ago I wrote a few articles describing the various tunnel protocols used for network virtualization between vSwitches on servers, and between vSwitches and physical network gateways. These are the mechanisms that construct overlay networks on top of a physical network. VMWare uses STT as the tunneling mechanism between vSwitches on servers and VXLAN to communicate with gateways to the non virtualized world. NVGRE is used mostly by Microsoft, and is an extension to GRE tunneling that has been around for a while.
Each one of these mechanisms have their pros and cons. They are all pretty much standard, or at least published by a standards organization, and multiple implementations exist of most of them. Outside of my complaint about the stream like nature of STT, the biggest problem with all of them is the fact that they are fixed in their definition. The header definition is fixed, the fields are fixed, the sizes of the headers are fixed.
The 24 bits used for a Virtual Network Identifier providing for 16 million different virtual network may seem like an amount we can live with for a long time to go. But creative minds will find ways to use those 24 bits to signal all sorts of meta information between the tunnel endpoints, or to intermediate switches and other services forwarding these tunneled packets. Additional summarized information about the content of a packet is extremely useful for any device or service that makes intelligent decisions on this packet.
And once you start that thought process, those 24 bits will disappear really quickly. And when 24 bits are not enough, it requires an update to the protocols and their implementations, and those are extremely painful, especially if portions of those protocols are handled in hardware.
Enter GENEVE, an Internet Draft published on Valentine’s day this year, which looks to take a more holistic view of tunneling. GENEVE takes its queue from many other protocols that have shown themselves to have a long life. Protocols like BGP, LLDP, ISIS and many others have been around for multiple decades and are still as popular as they have ever been. And the reason is simple, they are extendable. They evolve over time with new capabilities, not by revising the base protocols, but by adding new optional capabilities.
All of these protocols have a set of fixed headers, parameters and values, but then leave room for non-defined optional fields. New fields can be added to the protocol by simply defining and publishing them. The protocol is created in such a way that implementations know there may be optional fields that they may or may not understand.
Think of my favorite BGP. When its 4th version was created in the mid 90s, it had no ability to carry IPv6 (which wasn’t even called IPv6 at the time). It had no ability to carry multicast routes, Communities, ORFs or act as a Route Reflector. BGP has many optional attributes that have been added over the years and as a result is the most powerful routing protocol in existence. It is the result of a solid protocol design practice: we don’t know everything we may want to use this for at the moment we create it, so we design in the ability to simply add new capabilities.
Like VXLAN, GENEVE runs on top of UDP. It adds its own header, which is only 8 bytes of fixed header, containing that same 24 bit Virtual Network Identifier and a 16 bit Protocol Type as the main fields. After that, the initial definition is remarkably empty, every else is left open as options that follow a specific format if and when they get defined.
And that is the beauty of an extensible protocol, only those implementations that care about some specific option will have it implemented and acted upon. Everyone else has to quietly accept and ignore these options. Backward compatibility by design.
Along the way, a few more recommended practices are articulated, including one I complained about in my description of STT. While the language could be a bit stronger, it is recommended that each GENEVE encapsulated packet includes the entire header, which means I can actually reconstruct fragmented packets if I need to during debugging, each packet on the network has the entire original packet and the added GENEVE encapsulation.
Whether you like overlays, tunnels and everything that comes along with it or not, it is good to see folks from VMWare and Microsoft try and come together to create a single tunnel mechanism that is sensible and extensible. It seems to have all the right bits and pieces to have a long life and certainly provides mechanisms that allow for much better orchestration and cooperation between the overlay and physical network.
Of course it will take a while before it becomes a complete definition, with real implementations and hardware support. But when it does, we will have a better toolkit as a result.
[Today's fun fact: The city of Geneva (which is French of course is spelled Geneve) has the shortest commute time of any major city in the world. How appropriate.]
When an enterprise builds a hybrid IaaS cloud connecting its data center to one or more public clouds, security is often a major topic along with the other challenges involved. Security is closely intertwined with the networking choices made for the hybrid cloud. Traditional networking approaches for building a hybrid cloud try to kludge together the enterprise infrastructure with the public cloud. Consequently this approach requires risky, deep "surgery" including changes to firewalls, subnets...
Oct. 30, 2014 07:00 PM EDT Reads: 1,494
Ixia develops amazing products so its customers can connect the world. Ixia helps its customers provide an always-on user experience through fast, secure delivery of dynamic connected technologies and services. Through actionable insights that accelerate and secure application and service delivery, Ixia's customers benefit from faster time to market, optimized application performance and higher-quality deployments.
Oct. 30, 2014 07:00 PM EDT Reads: 1,804
SYS-CON Events announced today that Stratogent will exhibit at SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Stratogent is a custom managed services organization based in San Mateo, California. We design, implement, and support mission critical infrastructure 24x7 on premises, in datacenters and in the Cloud. Since 2005, we have acted as an extension of internal IT teams, achieving a customer reten...
Oct. 30, 2014 06:45 PM EDT Reads: 2,114
SYS-CON Events announced today that Harbinger Systems will exhibit at SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Harbinger Systems is a global company providing software technology services. Since 1990, Harbinger has developed a strong customer base worldwide. Its customers include software product companies ranging from hi-tech start-ups in Silicon Valley to leading product companies in the US a...
Oct. 30, 2014 06:00 PM EDT Reads: 3,093
SYS-CON Events announces a new pavilion on the Cloud Expo floor where WebRTC converges with the Internet of Things. Pavilion will showcase WebRTC and the Internet of Things. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices--computers, smartphones, tablets, and sensors – connected to the Internet by 2020. This number will con...
Oct. 30, 2014 05:30 PM EDT Reads: 2,148
The only place to be June 9-11 is Cloud Expo & @ThingsExpo 2015 East at the Javits Center in New York City. Join us there as delegates from all over the world come to listen to and engage with speakers & sponsors from the leading Cloud Computing, IoT & Big Data companies. Cloud Expo & @ThingsExpo are the leading events covering the booming market of Cloud Computing, IoT & Big Data for the enterprise. Speakers from all over the world will be hand-picked for their ability to explore the economic...
Oct. 30, 2014 05:30 PM EDT Reads: 1,110
SYS-CON Events announced today that Cloudian, Inc., the leading provider of hybrid cloud storage solutions, has been named “Bronze Sponsor” of SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Cloudian is a Foster City, Calif.-based software company specializing in cloud storage. Cloudian HyperStore® is an S3-compatible cloud object storage platform that enables service providers and enterprises to bui...
Oct. 30, 2014 04:45 PM EDT Reads: 1,879
SYS-CON Events announced today that Gridstore™, the leader in software-defined storage (SDS) purpose-built for Windows Servers and Hyper-V, will exhibit at SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Gridstore™ is the leader in software-defined storage purpose built for virtualization that is designed to accelerate applications in virtualized environments. Using its patented Server-Side Virtual C...
Oct. 30, 2014 02:00 PM EDT Reads: 2,526
As the Internet of Things unfolds, mobile and wearable devices are blurring the line between physical and digital, integrating ever more closely with our interests, our routines, our daily lives. Contextual computing and smart, sensor-equipped spaces bring the potential to walk through a world that recognizes us and responds accordingly. We become continuous transmitters and receivers of data. In his session at Internet of @ThingsExpo, Andrew Bolwell, Director of Innovation for HP’s Printing a...
Oct. 30, 2014 12:00 PM EDT Reads: 1,690
SAP is delivering break-through innovation combined with fantastic user experience powered by the market-leading in-memory technology, SAP HANA. In his General Session at 15th Cloud Expo, Thorsten Leiduck, VP ISVs & Digital Commerce, SAP, will discuss how SAP and partners provide cloud and hybrid cloud solutions as well as real-time Big Data offerings that help companies of all sizes and industries run better. SAP launched an application challenge to award the most innovative SAP HANA and SAP ...
Oct. 30, 2014 09:00 AM EDT Reads: 2,062
The Internet of Things (IoT) promises to evolve the way the world does business; however, understanding how to apply it to your company can be a mystery. Most people struggle with understanding the potential business uses or tend to get caught up in the technology, resulting in solutions that fail to meet even minimum business goals. In his session at Internet of @ThingsExpo, Jesse Shiah, CEO / President / Co-Founder of AgilePoint Inc., will show what is needed to leverage the IoT to transform...
Oct. 29, 2014 11:00 PM EDT Reads: 1,500
SYS-CON Events announced today that AIC, a leading provider of OEM/ODM server and storage solutions, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. AIC is a leading provider of both standard OTS, off-the-shelf, and OEM/ODM server and storage solutions. With expert in-house design capabilities, validation, manufacturing and production, AIC's broad selection of products are highly flexible and are conf...
Oct. 29, 2014 06:00 PM EDT Reads: 1,645
We are all here because we are sold on the transformative promise of The Cloud. But what good is all of this ephemeral, on-demand infrastructure if your usage doesn't actually improve the agility and speed of your business? How must Operations adapt in order to avoid stifling your Cloud initiative? In his session at DevOps Summit, Damon Edwards, co-founder and managing partner of the DTO Solutions, will highlight the successful organizational, process, and tooling patterns of high-performing c...
Oct. 29, 2014 01:35 PM EDT Reads: 1,259
SYS-CON Events announced today that O'Reilly Media has been named “Media Sponsor” of SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. O'Reilly Media spreads the knowledge of innovators through its books, online services, magazines, and conferences. Since 1978, O'Reilly Media has been a chronicler and catalyst of cutting-edge development, homing in on the technology trends that really matter and spurri...
Oct. 29, 2014 01:00 PM EDT Reads: 1,565
SYS-CON Events announced today that Aria Systems, the recurring revenue expert, has been named "Bronze Sponsor" of SYS-CON's 15th International Cloud Expo®, which will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Aria Systems helps leading businesses connect their customers with the products and services they love. Industry leaders like Pitney Bowes, Experian, AAA NCNU, VMware, HootSuite and many others choose Aria to power their recurring revenue bu...
Oct. 29, 2014 10:00 AM EDT Reads: 2,104
The Transparent Cloud-computing Consortium (abbreviation: T-Cloud Consortium) will conduct research activities into changes in the computing model as a result of collaboration between "device" and "cloud" and the creation of new value and markets through organic data processing High speed and high quality networks, and dramatic improvements in computer processing capabilities, have greatly changed the nature of applications and made the storing and processing of data on the network commonplace. ...
Oct. 29, 2014 10:00 AM EDT Reads: 2,041
Seagate has a strong track record of collaborating with others to develop better cloud solutions. The Seagate Cloud Builder Alliance program, for example, leverages the company’s knowledge of storage and cloud-optimized solutions to give cloud service providers the customized, flexible and scalable server and storage solutions to meet the high levels of service their customers demand. Seagate also is a member of the OpenStack Foundation and Open Compute Project to help define and promote open-so...
Oct. 29, 2014 09:30 AM EDT Reads: 1,923
The Internet of Things (IoT) is going to require a new way of thinking and of developing software for speed, security and innovation. This requires IT leaders to balance business as usual while anticipating for the next market and technology trends. Cloud provides the right IT asset portfolio to help today’s IT leaders manage the old and prepare for the new. Today the cloud conversation is evolving from private and public to hybrid. This session will provide use cases and insights to reinforce t...
Oct. 29, 2014 09:00 AM EDT Reads: 2,067
What process has your provider undertaken to ensure that the cloud tenant will receive predictable performance and service? What was involved in the planning? Who owns and operates the data center? What technology is being used? How is it being supported? In his session at 14th Cloud Expo, Dave Weisbrot, Cloud Business Manager for QTS, will provide the attendees a look into what it takes to stand up and stand behind a highly available certified cloud IaaS.
Oct. 29, 2014 08:30 AM EDT Reads: 1,525
I'll be hosting an SAP HANA Cloud webinar at 11am eastern time, Wednesday, October 29. You can sign up now. Featured speakers will be Allan Adler, Managing Partner, Channel Cloud Consulting, and Thorsten Leiduck, VP ISVs & Digital Commerce, SAP. Attendees will learn about • Cloud economics, hybrid cloud strategy, market size and opportunity • Introduction to SAP HANA Cloud Platform and how to: - Build new next-generation applications - Extend on-premise solutions non-disruptively throu...
Oct. 28, 2014 11:45 PM EDT Reads: 1,407