Click here to close now.

Welcome!

Virtualization Authors: Elizabeth White, Carmen Gonzalez, Tom Kemp, Adrian Bridgwater, XebiaLabs Blog

Related Topics: SDN Journal, Java, Linux, Virtualization

SDN Journal: Blog Post

There Is Cost Per Port and Then There Is Cost Per Port…

I let you do the math on the cost of that infrastructure. And the installation. And the maintenance

Earlier this week, Ethan Banks wrote a very nice article about Mellanox’s dual spine and leaf network in support of a large amount 10GbE access ports. After describing the scaled up network design, he reviews 8 observations about the design, not to point out good or bad, but merely to point out specific points to consider. Fully coincidental (Ethan lives close to us, but I am pretty sure he cannot peek through our windows) we had gone through a similar exercise this week, documenting the choices and limitations of spine and leaf networks. And as always, the conclusions are not ones of right or wrong, more of awareness of choices and consequences.

The Mellanox design Ethan describes employes an extra spine layer, we have seen and heard the same from Arista and others, some calling it a spine-spine or similar. Nitpicking perhaps, but adding a spine layer to a spine and leaf network and still calling it a spine and leaf network is like adding a docking station, screen and keyboard to a phone and still calling it a phone. It’s a computer that can make calls. And a spine and leaf network with an extra spine is a fat tree.

Ethan points out in his first few points that the sheer amount of cables and optics is astonishing. Let me try and put some numbers around that statement. If you build an approximate 3:1 oversubscribed spine and leaf network out of generic switches, I would probably use a Trident2 based ToR switch with 48 SFP+/10GbE ports and 6 QSFP/40GbE ports. The 48 ports should serve most rack deployments with single homed servers, only really dense or heavily multi homed servers would need more ports and I will use 4 of the QSFP ports to connect to my spine. That leaves 2 QSFPs on each leaf to be used for extra access ports, at the cost of some oversubscription. Or if I wanted I could use these as extra spine connections, lowering my oversubscription to 2:1. As a spine, and staying away from chassis based systems, I would pick a 32xQSFP/40GbE switch.

The largest spine and leaf I could build out of this combination is one that contains 16 spine switches and 96 leaf switches. In a spine and leaf I need to connect each leaf to each spine and I have the equivalent of 16x10GbE to use out of each leaf, which I can connect to at best 16 spines. With each spine receiving 1x10GbE from each leaf, I can build out to 96 leafs to fill out my 32xQSFP or 96x10GbE equivalent spine switch capacity. 96 Leaf switches give me 4608 10GbE access ports at 3:1 oversubscription, 5376 at a slightly worse oversubscription if I use the extra QSFP ports on my leaf switches. To support these 5376 access ports, I need 3584 10GbE fabric ports: 16 each from 96 leaf switches plus 32×4 from each spine. That means 1792 switch interconnect cables. And 3584 10GbE short reach optics, because the vast majority of connections between spines and leafs is likely to be at a distance that DAC cables cannot cover (not considering the fact that most high density 10GbE switches are designed without PHYs, limiting the use of passive cables to usually 5m or less).

I let you do the math on the cost of that infrastructure. And the installation. And the maintenance. And the sheer complexity of running a 10GbE from each leaf to each spine. If you want to reduce some of this complexity, you can switch to using 40GbE/QSFPs between the leafs and spines, but by doing so you have reduced the maximum size of the network. Each leaf will now contribute 1 QSFP worth of interconnect to each spine, to a 32xQSFP spine can only support 32 leaf switches, or 1536 10GbE access ports (1792 if you use the 2 extra leaf QSFP ports). And you probably noticed that I left no room on the spine switches to actually leave this spine and leaf network to the rest of the network infrastructure. Taking a few QSFPs for that will reduce the size of the network more.

Even in the spine, spine and leaf network (or spine, leaf and ToR in Mellanox terminology) the amount of cabling between the ToR (someone explain why that is not the leaf of the network?) and the aggregation leaf may be reduced, the cabling between their aggregation leaf and spine still follows the same model as above.

We often focus on the cost of switches and the derived cost per port. Of course the cost per port is important, but don’t fool yourself by taking the cost of a switch and dividing it by the number of ports it supports. It makes for great quotes in press releases, but the actual cost for that port is way higher the moment you add in the overhead required to connect that port to the rest of the network. And for spine and leaf networks, the cost of the rest of the network has a very large portion of cables and optics. Even for reasonably priced optics, that piece of the infrastructure is likely going to cost more than the cost of the spine switches together. Even when you create one of these multispined animals…

[Today's fun fact: The human spine contains 120 muscles and approximately 220 individual ligaments.]

The post There is cost per port and then there is cost per port… 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.

@ThingsExpo Stories
Buzzword alert: Microservices and IoT at a DevOps conference? What could possibly go wrong? Join this panel of experts as they peel away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you’ll have no problem filling in your buzzword bingo cards.
SYS-CON Events announced today that CodeFutures, a leading supplier of database performance tools, has been named a “Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9–11, 2015, at the Javits Center in New York, NY. CodeFutures is an independent software vendor focused on providing tools that deliver database performance tools that increase productivity during database development and increase database performance and scalability during production.
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Raspberry Pi, BeagleBone, Spark and Intel Edison. You will also get an overview of cloud technologies s...
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 strategies that utility/cloud computing provides. Whether public, private, or in a hybrid form, clo...
Internet of Things (IoT) will be a hybrid ecosystem of diverse devices and sensors collaborating with operational and enterprise systems to create the next big application. In their session at @ThingsExpo, Bramh Gupta, founder and CEO of robomq.io, and Fred Yatzeck, principal architect leading product development at robomq.io, will discuss how choosing the right middleware and integration strategy from the get-go will enable IoT solution developers to adapt and grow with the industry, while at the same time reduce Time to Market (TTM) by using plug and play capabilities offered by a robust I...
IoT is still a vague buzzword for many people. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. He also discussed how IoT is perceived by investors and how venture capitalist access this space. Other topics discussed were barriers to success, what is new, what is old, and what the future may hold. Mike Kavis is Vice President & Principal Cloud Architect at Cloud Technology Pa...
SYS-CON Events announced today that Creative Business 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. Creative Business Solutions is the top stocking authorized HP Renew Distributor in the U.S. Based out of Long Island, NY, Creative Business Solutions offers a one-stop shop for a diverse range of products including Proliant, Blade and Industry Standard Servers, Networking, Server Options and Care Packs. As a trusted supplier, CBS guarantees quality controlled stock levels thanks to an Auto...
SOA Software has changed its name to Akana. With roots in Web Services and SOA Governance, Akana has established itself as a leader in API Management and is expanding into cloud integration as an alternative to the traditional heavyweight enterprise service bus (ESB). The company recently announced that it achieved more than 90% year-over-year growth. As Akana, the company now addresses the evolution and diversification of SOA, unifying security, management, and DevOps across SOA, APIs, microservices, and more.
Can call centers hang up the phones for good? Intuitive Solutions did. WebRTC enabled this contact center provider to eliminate antiquated telephony and desktop phone infrastructure with a pure web-based solution, allowing them to expand beyond brick-and-mortar confines to a home-based agent model. It also ensured scalability and better service for customers, including MUY! Companies, one of the country's largest franchise restaurant companies with 232 Pizza Hut locations. This is one example of WebRTC adoption today, but the potential is limitless when powered by IoT.
SYS-CON Events announced today that Optimal Design, an Internet of Things solution provider, will exhibit at SYS-CON's Internet of @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Optimal Design is an award winning product development firm offering industrial design and engineering services to the consumer, medical, and defense markets.
Chuck Piluso will present a study of cloud adoption trends and the power and flexibility of IBM Power and Pureflex cloud solutions. Speaker Bio: Prior to Data Storage Corporation (DSC), Mr. Piluso founded North American Telecommunication Corporation, a facilities-based Competitive Local Exchange Carrier licensed by the Public Service Commission in 10 states, serving as the company's chairman and president from 1997 to 2000. Between 1990 and 1997, Mr. Piluso served as chairman & founder of International Telecommunications Corporation, a facilities-based international carrier licensed by t...
There are lots of challenges in IoT around secure, scalable and business friendly infrastructure for enterprises. For large corporations, IoT implementations are one of the top priorities of the decade. All industries are seeing a competitive need to sustain by investing in IoT initiatives. The value addition comes from improved customer service, innovative product and additional revenue streams. The data from these IP-connected devices can be leveraged for a variety of business applications as well as responsive action controls. The various architectural building blocks of an IoT ...
GENBAND introduced its Real Time Communications (RTC) Client for Lync* to seamlessly combine real-time communications with Lync Instant Messaging (IM) and Presence. “We’re shaking up the economics of delivering Unified Communications (UC) and offering a compelling way to integrate previously bespoke communications technologies,” said Carl Baptiste, GENBAND’s Senior Vice President, Enterprise Solutions. “We’re offering enterprises the best of both worlds by combining our own high availability voice, video and collaboration with Lync’s IM and Presence; creating a single, web centric, client. O...
The list of ‘new paradigm’ technologies that now surrounds us appears to be at an all time high. From cloud computing and Big Data analytics to Bring Your Own Device (BYOD) and the Internet of Things (IoT), today we have to deal with what the industry likes to call ‘paradigm shifts’ at every level of IT. This is disruption; of course, we understand that – change is almost always disruptive.
After making a doctor’s appointment via your mobile device, you receive a calendar invite. The day of your appointment, you get a reminder with the doctor’s location and contact information. As you enter the doctor’s exam room, the medical team is equipped with the latest tablet containing your medical history – he or she makes real time updates to your medical file. At the end of your visit, you receive an electronic prescription to your preferred pharmacy and can schedule your next appointment.
The WebRTC Summit 2015 New York, to be held June 9-11, 2015, at the Javits Center in New York, NY, announces that its Call for Papers is open. Topics include all aspects of improving IT delivery by eliminating waste through automated business models leveraging cloud technologies. WebRTC Summit is co-located with 16th International Cloud Expo, @ThingsExpo, Big Data Expo, and DevOps Summit.
@ThingsExpo has been named the Top 5 Most Influential M2M Brand by Onalytica in the ‘Machine to Machine: Top 100 Influencers and Brands.' Onalytica analyzed the online debate on M2M by looking at over 85,000 tweets to provide the most influential individuals and brands that drive the discussion. According to Onalytica the "analysis showed a very engaged community with a lot of interactive tweets. The M2M discussion seems to be more fragmented and driven by some of the major brands present in the M2M space. This really allows some room for influential individuals to create more high value inter...
SYS-CON Events announced today that Liaison Technologies, a leading provider of data management and integration cloud services and solutions, has been named "Silver Sponsor" of SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York, NY. Liaison Technologies is a recognized market leader in providing cloud-enabled data integration and data management solutions to break down complex information barriers, enabling enterprises to make smarter decisions, faster.
WebRTC Summit has announced today that Peter Dunkley has been named summit chair of WebRTC Summit 2015 New York. The 4th International WebRTC Summit will take place on June 9-11, 2015, at the Javits Center in Manhattan, New York. @ThingsExpo anticipates 90% of WebRTC companies & developers will monetize their products & services through IoT by 2016. Peter Dunkley is Technical Director at Acision. He graduated from The University of Edinburgh in 2000 with a BSc (Hons) in Computer Science. After graduation Peter worked on a PSTN switch developing signalling stacks for SS7, ISDN and simi...
In this session we look at creating interactive communications via the web by adding messaging, file transfer, and group communication (group chat and audio/video conferencing) into the web experience. We will also discuss potential applications of this technology in areas including B2B, B2C, P2P, and gaming. Peter is Technical Director at Acision. He graduated from The University of Edinburgh in 2000 with a BSc (Hons) in Computer Science. After graduation Peter worked on a PSTN switch developing signalling stacks for SS7, ISDN and similar protocols and creating advanced routing and serv...