Close to the wire: How route analytics can help prevent BGP-caused outages
Close to the wire: How route analytics can help prevent BGP-caused outages
by Brian Boyko, Contributor - September 16, 2014
At around 3:00 a.m. Eastern Daylight Time on August 13th, Internet users started reporting slow connectivity and intermediate outages. This impacted many large networks and hosting providers including eBay, Comcast, and Time-Warner.
The problem was that some older Cisco routers have a default limit of 512k border gateway protocol (BGP) routing entries in their TCAM memory. Normally, routing tables typically have around 500k entries, so there’s a little bit of a buffer. But BGP prefix aggregation for a major service provider’s systems temporarily failed. The service provider quickly fixed the problem on their end, but not before 15,000 new prefixes were sent to the global routing table, surpassing that 512k limit.
There is a work-around for these routers to increase the maximum size for the routing tables, but one has to wonder why these routers were running so close to maximum to begin with. In short, there is clearly a need for a larger margin of error.
The August 13th event highlights one of the reasons that route analytics are more important than ever. With the visibility Continue reading
Network Monitoring Videos from NFD8
In yesterday’s post (Network Monitoring – So Many Choices), I neglected to link to the videos from Networking Field Day 8 covering the network monitoring portions of the presentations from Gigamon, Pluribus and Big Switch. So rather than go back … Continue reading
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Why is Lync The Killer SDN Application?
The key to showing the promise of SDN is to find a real-world application to showcase capabilities. I recently wrote about using SDN to slice education networks. But this is just one idea. When it comes to real promise, you have to shelve the approach and trot out a name. People have to know that SDN will help them fix something on their network or optimize an troublesome program. And it appears that application is Microsoft Lync.
MIssing Lync
Microsoft Lync (neè Microsoft Office Communicator) is a software application designed to facilitate communications. It includes voice calling capability, instant messaging, and collaboration tools. The voice part is particularly appealing to small businesses. With a Microsoft Office 365 for Business subscription, you gain access to Lync. That means introducing a voice soft client to your users. And if it’s available, people are going to use it.
As a former voice engineer, I can tell you that soft clients are a bit of a pain to configure. They have their own way of doing things. Especially when Quality of Service (QoS) is involved. In the past, tagging soft client voice packets with Cisco Jabber required setting cluster-wide parameters for all clients. It Continue reading
Docker Closes $40M Series C Led by Sequoia
Today is a great day for the Docker team and the whole Docker ecosystem.
We are pleased to announce that Docker has closed a $40M Series C funding round led by Sequoia Capital. In addition to giving us significant financial resources, Docker now has the insights and support of a board that includes Benchmark, Greylock, Sequoia, Trinity, and Jerry Yang.
This puts us in a great position to invest aggressively in the future of distributed applications. We’ll be able to significantly expand and build the Docker platform and our ecosystem of developers, contributors, and partners, while developing a broader set of solutions for enterprise users. We are also very fortunate that we’ll be gaining the counsel of Bill Coughran, who was the SVP of Engineering at Google for eight years prior to joining Sequoia, and who helped spearhead the extensive adoption of container-based technologies in Google’s infrastructure.
While the size, composition, and valuation of the round are great, they are really a lagging indicator of the amazing work done by the Docker team and community. They demonstrate the amazing impact our open source project is having. Our user community has grown exponentially into the millions and we have a constantly expanding network of contributors, Continue reading
After cheap, what is important for cloud services?
Amazon is indisputably the biggest name in cloud service providers. They have built up a strong market presence primarily on the argument that access to cheap compute and storage resources is attractive to companies looking to shed IT costs as they move from on-premises solutions to the cloud. But after the initial push for cheap resources, how will this market develop?
Is cheap really cheap?
Amazon has cut prices to their cloud offering more than 40 times since introducing the service in 2006. The way this gets translated in press circles is that cloud services pricing is approaching some floor. But is that true?
In October 2013, Ben Kepes over at Forbes wrote an interesting article that included a discussion of AWS pricing. In the article, he quotes some work done by Profitbricks that shows AWS pricing relative to Moore’s Law. The article is here, and the image from the article is below:
Moore’s Law tells us that performance will roughly double every two years. Of course it is not really a law but more a principle useful in forecasting how generalized compute and storage performance will track over time. The other side of this law is that we have Continue reading
python interface-checker
I’d like helpdesk to be able to enable and disable switchports without requiring them to know the underlying OS. My plan is to have a webpage with a list of devices. When you click on a device it will check the interfaces status via SNMP and display administrative and operational status of all interfaces on […]The Four Paths to SDN
After the initial onslaught of SDN washing, four distinct approaches to SDN have started to emerge, from centralized control plane architectures to smart reuse of existing protocols.
As always, each approach has its benefits and drawbacks, and there’s no universally best solution. You just got four more (somewhat immature) tools in your toolbox. And now for the details.
Read more ...Show 205 – Open Source Network Monitoring with OMDistro.org
Network monitoring is one of our most requested topics on Packet Pushers, and this week we take on open source monitoring solutions. Why open source? Because commercial NMS solutions are all over the place in functionality and price. So, if it’s possible to put a solid NMS in place based on open source, then it’s […]
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The post Show 205 – Open Source Network Monitoring with OMDistro.org appeared first on Packet Pushers Podcast and was written by Ethan Banks.
The Evolution from Products to Platforms in Software Driven Cloud Networking
Legacy networking vendors have often declared that they do not build “boxes” but actually build “systems and architectures”. I have tried to understand what that really means. Undoubtedly, new applications on the Internet have evolved and now depend on a modern infrastructure that outlives any particular static workload or physical machine. Indeed, at Arista, we along with our customers are looking at a technology evolution that goes beyond individual components to a universal cloud architecture.
Disruptive Innovation Begins with Products, aka “Boxes”
Building a “best of breed” product is a vital foundation to building a good system. Typical metrics may include feeds and speeds such as latency, power, port density (non-blocking), fabric capacity, throughput and scale combined with a feature-rich network operating system. Examples of this include Cisco’s routers and Catalyst switches (with IOS) in the 1990s, F5’s Big IP and Splunk’s data analytics in the past decade, or even more recently, Arista’s 7000 series Leaf-Spine-Spline products. Vendors with breakthrough products are pioneers and thought-leaders in their markets and often establish trends rather than follow them. Sustained differentiation beyond point features is a common theme. Such products are disruptive in nature, bringing critical business benefits and reducing capex spend within Continue reading
Understanding IPv6: Prepping For Solicited-Node Multicast
Before jumping into solicited-node multicast, a review of link-local scope multicast addresses is helpful.How Stacks are Handled in Go.
At CloudFlare, We use Go for a variety of services and applications. In this blog post, We're going to take a deep dive into some of the technical intricacies of Go.
One of the more important features of Go is goroutines. They are cheap, cooperatively scheduled threads of execution that are used for a variety of operations, like timeouts, generators and racing multiple backends against each other. To make goroutines suitable for as many tasks as possible, we have to make sure that each goroutine takes up the least amount of memory, but also have people be able to start them up with a minimal amount of configuration.
To achieve this, Go manages stacks in way that behaves like any other language, but is quite different in how they're implemented.
An introduction to thread stacks
Before we look at Go, let's look at how stacks are managed in a traditional language like C.
When you start up a thread in C, the standard library is responsible for allocating a block of memory to be used as that thread's stack. It will allocate this block, tell the kernel where it is and let the kernel handle the execution of the thread. Continue reading
What Good is UML?
A friend of mine — Tony P to be exact — recently talked me into reading up on UML. I hadn’t worked a lot with modeling languages in a serious way before, but I took the bait and read UML Distilled (Safari Amazon). Okay — this is actually interesting stuff. First, a short review of the book itself.
There are, according to the author, two sorts of UML models. The one advocated here is sketchup, which is used to outline a process or the relationship between various components. There is a stricter version of UML that can actually be compiled into software, but I immediately attached the PowerPoint compiler to this in my head (right or wrong, there’s something about moving from a model to a product without anything in the middle that just doesn’t seem right to me — maybe I’m just an old fogy or something). The progress of the book is useful, moving from the basic concept of modeling languages, a history of the UML, and finally through several constructs within the UML. The author attempts to take you through enough constructs to get you to the point of being able to use the UML Continue reading
Viewing HTTP Headers Using Browser Developer Tools
I often find myself viewing HTTP headers (request and response) at the ‘client side’, which are often much quicker (and safer) than decrypting SSL/TLS traffic on a load balancer/ADC. With the use of SSL/TLS growing rapidly even within private networks and the inability to decrypt PFS/DHE protected traffic, this can often be the only way to troubleshoot. The reasons I […]
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The post Viewing HTTP Headers Using Browser Developer Tools appeared first on Packet Pushers Podcast and was written by Steven Iveson.
Network Monitoring – So Many Choices!
I’ve had network monitoring systems on my mind recently as we’ve been looking to determine the right specification for a number of fiber taps and aggregation devices so that we can fulfill the needs of both the security teams (for … Continue reading
If you liked this post, please do click through to the source at Network Monitoring – So Many Choices! and give me a share/like. Thank you!
Understanding IPv6: What Is Solicited-Node Multicast?
Denise Fishburne lays down the basics of solicited-node multicast, which provides the functionality for Neighbor Discovery in IPv6 addressing.Cracking the cloud code
The cloud is one of those technology trends that seems to be perpetually on the cusp of becoming ubiquitous. But if recent analyst reports are any indication, cloud’s breakthrough moment is imminent. Late last year, Gartner predicted that in 2016, the bulk of new IT spend would shift to the public cloud, and that by the end of 2017, nearly half of all enterprises will have hybrid cloud deployments.
But if cloud has been around for so long, why will it take so long for cloud to become the dominant source of IT spend?
Psychology vs Technology
The determinant for most change is the underlying psychology that drives individuals and organizations. The IT industry as a whole has been underpinned by a deep-seeded need for control. The reason that most companies keep expertise in-house is that they want to maintain control—over their data, over the integration with their business workflows, over their schedules, and over their spend.
Of course control is under constant attack by cost. While traffic is booming, IT spend in most organizations continues to trend flat to down. This means that organizations need to constantly provide more compute resources, more storage, and faster interconnect while working with Continue reading
SDN Certification Update – September ‘14
If you care about building your own SDN skills, SDN certifications should matter to you, at least for the purpose of figuring out what to study (an argument I’ve made in an earlier post.) Since that time, the SDN world has seen several updates to vendor SDN certifications. (I’m also hopeful that we’ll see a few more at the upcoming Interop New York show towards the end of September.) Today’s post summarizes those that merit a look, at least for the purposes of figuring out what you might want to learn to retool for an SDN world.
Latest Highlights
Here’s a quick list of surprises and other goodies from this latest scan of the state of the art:
- VMWare lets some Cisco CCNAs and CCNPs bypass the need to take a class when getting the first VMWare SDN cert (VCP-NV).
- Brocade has a free exam voucher program (stated as limited time), plus a free video course, for their “NFV” cert. In theory, there’s no cash cost to study for and achieve this cert!
- Cisco’s SDN certs have inexpensive (less than $100) video courses for each cert.
Dig into the rest of the post for more details!