Welcome!

SDN Journal Authors: Jason Bloomberg, Mike Wood, Liz McMillan, Scott Davis, Carl J. Levine

Related Topics: Containers Expo Blog, Microsoft Cloud, @CloudExpo, SDN Journal

Containers Expo Blog: Blog Post

Attention: Overlay Tunnel Construction Ahead

It's good to see folks from VMWare and Microsoft try and come together to create a single tunnel mechanism

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.

GENEVE Header

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.]

The post Attention: overlay tunnel construction ahead appeared first on Plexxi.

Read the original blog entry...

More Stories By Marten Terpstra

Marten Terpstra is a Product Management Director at Plexxi Inc. Marten has extensive knowledge of the architecture, design, deployment and management of enterprise and carrier networks.

@CloudExpo Stories
SYS-CON Events announced today that Juniper Networks (NYSE: JNPR), an industry leader in automated, scalable and secure networks, will exhibit at 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. Juniper Networks challenges the status quo with products, solutions and services that transform the economics of networking. The company co-innovates with customers and partners to deliver automated, scalable and secure network...
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo | @ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA. Learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
The 20th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held June 6-8, 2017, at the Javits Center in New York City, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit your speaking proposal ...
@GonzalezCarmen has been ranked the Number One Influencer and @ThingsExpo has been named the Number One Brand in the “M2M 2016: Top 100 Influencers and Brands” by Analytic. Onalytica analyzed tweets over the last 6 months mentioning the keywords M2M OR “Machine to Machine.” They then identified the top 100 most influential brands and individuals leading the discussion on Twitter.
SYS-CON Events announced today that Hitachi, the leading provider the Internet of Things and Digital Transformation, will exhibit at 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. Hitachi Data Systems, a wholly owned subsidiary of Hitachi, Ltd., offers an integrated portfolio of services and solutions that enable digital transformation through enhanced data management, governance, mobility and analytics. We help globa...
Blockchain is a shared, secure record of exchange that establishes trust, accountability and transparency across supply chain networks. Supported by the Linux Foundation's open source, open-standards based Hyperledger Project, Blockchain has the potential to improve regulatory compliance, reduce cost and time for product recall as well as advance trade. Are you curious about Blockchain and how it can provide you with new opportunities for innovation and growth? In her session at 20th Cloud Exp...
The buzz continues for cloud, data analytics and the Internet of Things (IoT) and their collective impact across all industries. But a new conversation is emerging - how do companies use industry disruption and technology enablers to lead in markets undergoing change, uncertainty and ambiguity? Organizations of all sizes need to evolve and transform, often under massive pressure, as industry lines blur and merge and traditional business models are assaulted and turned upside down. In this new da...
Back in February of 2017, Andrew Clay Schafer of Pivotal tweeted the following: “seriously tho, the whole software industry is stuck on deployment when we desperately need architecture and telemetry.” Intrigue in a 140 characters. For me, I hear Andrew saying, “we’re jumping to step 5 before we’ve successfully completed steps 1-4.”
SYS-CON Events announced today that T-Mobile will exhibit at 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. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...
SYS-CON Events announced today that Hitachi, the leading provider the Internet of Things and Digital Transformation, will exhibit at 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. Hitachi Data Systems, a wholly owned subsidiary of Hitachi, Ltd., offers an integrated portfolio of services and solutions that enable digital transformation through enhanced data management, governance, mobility and analytics. We help globa...
“DevOps is really about the business. The business is under pressure today, competitively in the marketplace to respond to the expectations of the customer. The business is driving IT and the problem is that IT isn't responding fast enough," explained Mark Levy, Senior Product Marketing Manager at Serena Software, in this SYS-CON.tv interview at DevOps Summit, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
20th Cloud Expo, taking place June 6-8, 2017, at the Javits Center in New York City, NY, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy.
SYS-CON Events announced today that Grape Up will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct. 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Grape Up is a software company specializing in cloud native application development and professional services related to Cloud Foundry PaaS. With five expert teams that operate in various sectors of the market across the U.S. and Europe, Grape Up works with a variety of customers from emergi...
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place June 6-8, 2017, at the Javits Center in New York City, New York, is co-located with 20th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry p...
SYS-CON Events announced today that Super Micro Computer, Inc., a global leader in compute, storage and networking technologies, will exhibit at 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. Supermicro (NASDAQ: SMCI), the leading innovator in high-performance, high-efficiency server technology, is a premier provider of advanced server Building Block Solutions® for Data Center, Cloud Computing, Enterprise IT, Hadoop/...
Amazon has gradually rolled out parts of its IoT offerings in the last year, but these are just the tip of the iceberg. In addition to optimizing their back-end AWS offerings, Amazon is laying the ground work to be a major force in IoT – especially in the connected home and office. Amazon is extending its reach by building on its dominant Cloud IoT platform, its Dash Button strategy, recently announced Replenishment Services, the Echo/Alexa voice recognition control platform, the 6-7 strategic...
Bert Loomis was a visionary. This general session will highlight how Bert Loomis and people like him inspire us to build great things with small inventions. In their general session at 19th Cloud Expo, Harold Hannon, Architect at IBM Bluemix, and Michael O'Neill, Strategic Business Development at Nvidia, discussed the accelerating pace of AI development and how IBM Cloud and NVIDIA are partnering to bring AI capabilities to "every day," on-demand. They also reviewed two "free infrastructure" pr...
Developers want to create better apps faster. Static clouds are giving way to scalable systems, with dynamic resource allocation and application monitoring. You won't hear that chant from users on any picket line, but helping developers to create better apps faster is the mission of Lee Atchison, principal cloud architect and advocate at New Relic Inc., based in San Francisco. His singular job is to understand and drive the industry in the areas of cloud architecture, microservices, scalability ...
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at Dell EMC, introduced a methodology for capturing, enriching and sharing data (and analytics) across the organization...
The explosion of new web/cloud/IoT-based applications and the data they generate are transforming our world right before our eyes. In this rush to adopt these new technologies, organizations are often ignoring fundamental questions concerning who owns the data and failing to ask for permission to conduct invasive surveillance of their customers. Organizations that are not transparent about how their systems gather data telemetry without offering shared data ownership risk product rejection, regu...