I was listening to the I2RS Packet Pushers podcast a while ago and was more than glad that when Greg Ferro yet again mentioned the complexity of OSPF, someone simply pointed out that controllers would not reduce the complexity; if anything they would increase it.
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I generally try to avoid combing my thoughts about presentations, but I have to mention that after sitting down with Glue Networks and their “SDN” presentation, it was truly a breath of fresh air to hear from HP. They went into some details on how they demonstrated the capabilities of their SDN platform. They purposely stretched their network out the limits of what they thought was possible.
On top of that, they spent some time talking about the launch of the very first SDN application ecosystem to market. I have to say, this is a fantastic idea and I’m glad that they brought it to fruition. Not only will the App Store help customers understand the real value behind SDN, as well as discover specific network applications that could help solve problems they’re facing today.
Take a few minutes to listen to Chris Young and Jeff Enters from HP give a fantastic white boarding session on the architecture behind the network they brought to Interop and the specific challenges of building it. Checkout http://hp.com/go/sdn for more info.
While Cisco and HP were responsible for paying a portion of the travel and lodging costs for me during Continue reading
CC BY 2.0 by JD Hancock
Last Monday we announced our SSL for Free plan users called Universal SSL. Universal SSL means that any site running on CloudFlare gets a free SSL certificate, and is automatically secured over HTTPS.
Using SSL for a web site helps make the site more secure, but there's another benefit: it can also make the site faster. That's because the SPDY protocol, created by Google to speed up the web, actually requires SSL and only web sites that support HTTPS can use SPDY.
CloudFlare has long supported SPDY, and kept up to date with improvements in the protocol. We currently support the most recent version of SPDY: 3.1.
CloudFlare's mission to bring the tools of the Internet giants to everyone is two fold: security and performance. As part of the Universal SSL launch, we also rolled out SPDY for everyone. Many of the web's largest sites use SPDY; now all sites that use CloudFlare are in the same league.
If your site is on CloudFlare, and you use a modern browser that supports SPDY, you'll find that the HTTPS version of your site is now served over SPDY. SPDY allows the Continue reading
Vint Cerf wrote a wonderful piece on the problems I’ve been wrestling with the last number of years, called “Bufferbloat and Other Internet Challenges“. It is funny how one thing leads to another; I started just wanting my home network to work as I knew it should, and started turning over rocks. The swamp we’re in is very deep and dangerous, the security problem the worst of all (and given how widespread bufferbloat is, that’s saying something). The “Other Challenges” dwarf bufferbloat, as large a problem as it is.
I gave a lunch talk at the Berkman Center at Harvard in June on the situation and recommend people read the articles by Bruce Schneier and Dan Geer you will find linked there, which is their takes on the situation I laid out to them (both articles were triggered by the information in that talk).
Dan Geer’s piece is particularly important from a policy perspective.
I also recommend reading “Familiarity Breeds Contempt: The Honeymoon Effect and the Role of Legacy Code in Zero-Day Vulnerabilities“, by Clark, Fry, Blaze and Smith, which makes clear to me that our engineering processes need fundamental reform in the face of very Continue reading
There are lots of great things happening at Ansible (and we aren't just talking about the new coffee in the breakroom). We've had a great summer with the hiring a bunch of new Ansible team members, the release of Ansible 1.7.2 and Ansible Tower 2.0. Fall is shaping up to be even better.
-- Inforworld names Ansible one of The best open source data center and cloud software companies.
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Engineers are supposed to be able to gather information, arrange it in a way that makes sense, and then propose a solution that actually solves the problem at hand — right? So why is it I’m almost constantly astounded at the lack of writing skills in the engineering community? Why don’t engineers know how to write, given the almost complete overlap between the way the engineering process is supposed to work, and the way writing is supposed to work?
I suspect there are a number of reasons, probably foremost of which is that engineers don’t think in the logical chains we like to believe. Engineers are too often caught in the modern “search engine world” — find a thesis, search for a few exports to support your belief, and declare the issue decided. We’re sorely lacking the serious interplay between ideas, the pros and cons way of thinking, that exist in many other intellectual pursuits (though honestly, on a decreasing level every day).
If you need some encouragement, let me put it another way: learning to write will not only enhance your thinking skills as an engineer, it will also advance your career. Seriously.
What to do? Well, we can’t Continue reading
Last Wednesday I had the pleasure of meeting with Chris Young and Jeff Enters from HP Networking as part of Tech Field Day Extra! at Interop NYC 2014. Going into the discussion I had expected to get a presentation on … Continue reading
If you liked this post, please do click through to the source at HP Talks SDN Turkey at Interop and give me a share/like. Thank you!
Software-defined networking is fundamentally about two things: the centralization of network intelligence to make smarter decisions, and the creation of a single (or smaller number of) administrative touch points to allow for streamlined operations and to promote workflow automation. The former can potentially lead to new capabilities that make networks better (or create new revenue streams), and the latter is about reducing the overall operating costs of managing a network.
Generating revenue makes perfect sense for the service providers who use their network primarily as a means to drive the business. But most enterprises use the network as an enabling entity, which means they are more interested in the bottom line than the top. For these network technology consumers, the notion of reducing costs can be extremely powerful.
But how do those OpEx savings manifest themselves?
When we consider OpEx, it’s easy to point to the things that are measurable: space, power and cooling. So as enterprise customers examine various solutions, they will look at how many devices are required, and then how those devices consume space, power, and cooling. It is relatively straightforward to do these calculations and line up competing solutions. Essentially, you calculate Continue reading
“But the seven layer model is still useful for teaching networking…” So ran the most common reaction to my post last week about the seven layer model being dead. But let me ask something — how useful is the seven layer model for teaching networking? It doesn’t match the TCP/IP stack, it doesn’t account for […]
Bryan sent me an interesting question:
When you have the opportunity to use LAG or ECMP, what are some things you should consider?
He already gathered some ideas (thank you!) and I expanded his list and added a few comments.
Read more ...Last week’s Interop New York was hard work (three workshops in two days), but also lots of nerdy fun. I love doing workshops with smart participants who bring their real-life problems to the room and challenge my assumptions and conclusions, and I had plenty of these interactions during the week. Thank you all (you know who you are)!
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| edelman-interopnyc-092014pv.pdf |
Troubleshooting Lab 1 has been added to the CCIE Routing & Switching v5 Workbook. This is in addition to Full Scale Lab 1 which was posted yesterday. More Foundation, Troubleshooting, and Full Scale Labs will be added soon to the workbook. More information about additional content and its release schedule will be available shortly.
This lab uses a 20 router topology which will be available through our rack rental system shortly. In the meantime if you have your own lab built on CSR1000v, IOU/IOL, etc. the initial configs are available to download on the lab 1 tasks page. For technical discussion of this lab, please visit the Troubleshooting Labs section of our Online Community here.
Bra-padding is a term used to describe fluff marketing pieces about some relatively minor advance in product or technology. Mostly favoured by large incumbent technology vendors like EMC, Cisco etc who have an over-abundance of marketing people who need something to occupy their time.
The post Dictionary: Bra-padding appeared first on EtherealMind.
Utility, or Consumption-Based pricing models offer an interesting way of matching costs to revenues. But if they’re not managed well, customer costs could blow out just trying to keep the lights on. We’ve come to expect rapidly declining hardware prices. Have vendors realised their utility prices need to decline at a similar rate?
I’ve been doing more architecture work over the last twelve months, and this has changed some of my thinking about technology. Previously I was only really interested in speeds & feeds, and technical capabilities. Scaling was only about how to add capacity – not what it would cost. When I looked at costs, it was just to shake my head at the ridiculous prices charged for things like a second power supply.
But now I find myself interested in things like cost curves, and trying to figure out how my costs will change as demand changes. The ideal is for their to be a clear relationship between costs & revenue, hopefully with costs growing at a slower rate than demand (and revenue).
Previously we had high upfront costs to buy hardware and software, and we aimed to amortise it over the life of the service. Our costs Continue reading
The Cisco ISR G2 routers have been around for a while now. Roughly a year ago, Cisco released the Cisco 4451-X router which was the first ISR running IOS-XE. Cisco has now added new routers to the 4000 family, which means that the ISR G2 family will eventually go away. Don’t panic though! That will not happen for a while but if you are looking to buy new ISR routers, then take a look at the new 4000 family.
One great thing about the new ISR 4000 routers is that they support upgrading of the bandwidth capacity by buying a license. That means that you can keep the same router for a longer time and grow into it, rather than doing a complete replacement as your demand for bandwidth increases. The new models are ISR 4321, 4331, 4351 and 4431.
If you need a router that does 10 Mbit/s, then you can get the 4321 and you can keep using it until you reach 100 Mbit/s. The 4331 will get you from 100-300 Mbit/s which would cover a lot of customers that I currently have.
The next slide shows some of the new features of the ISR 4000:
The ISR Continue reading
