OpenStack Opportunities And Obstacles
A new study sheds light on the state of OpenStack adoption in the enterprise.
Slicing and Dicing Flooding Domains (2)
The first post in this series is here.
Finally, let’s consider the first issue, the SPF run time. First, if you’ve been keeping track of the SPF run time in several locations throughout your network (you have been, right? Right?!? This should be a regular part of your documentation!), then you’ll know when there’s a big jump. But a big jump without a big change in some corresponding network design parameter (size of the network, etc.), isn’t a good reason to break up a flooding domain. Rather, it’s a good reason to go find out why the SPF run time changed, which means a good session of troubleshooting what’s probably an esoteric problem someplace.
Assume, however, that we’re not talking about a big jump. Rather, the SPF run time has been increasing over time, or you’re just looking at a particular network without any past history. My rule of thumb is to start really asking questions when the SPF run time gets to around 100ms. I don’t know where that number came from—it’s a “seat of the pants thing,” I suppose. Most networks today seem to run SPF in less than 10ms, though I’ve seen a few that Continue reading
Equinix Taps Open Compute Hardware to Build a Container Exchange
Embracing containers, open source, and hybrid clouds all at once.
Datanauts 026: Achieving VMware’s Highest Certification – The VCDX
On today's Datanauts episode we talk about the VCDX, the highest certification available from VMware. Chris Wahl, who has two, shares his experiences on preparation and taking the exam.
The post Datanauts 026: Achieving VMware’s Highest Certification – The VCDX appeared first on Packet Pushers.
Datanauts 026: Achieving VMware’s Highest Certification – The VCDX
On today's Datanauts episode we talk about the VCDX, the highest certification available from VMware. Chris Wahl, who has two, shares his experiences on preparation and taking the exam.
The post Datanauts 026: Achieving VMware’s Highest Certification – The VCDX appeared first on Packet Pushers.
Survey says… Teachers Say Wi-Fi Woes Still found in American K-12 Schools
By: Richard Nedwich, Global Director of Education There has never been more Wi-Fi in schools than there is today. So are teachers feeling empowered or hindered by Wi-Fi in their classrooms? That’s the question a new survey from EdWeek, sponsored...Open Compute Project Looks at WiFi Access Points
Extending open hardware all the way to access points.
vArmour Becomes a Security Option for Cisco ACI
Little security company has been latching onto some big names.
Kernel Programming 101 – Creating your own Linux Kernel Module
Have you ever wanted to write your own kernel module? This multi-part blog post will talk about creating your first kernel module, using the proc file system, gathering and updating statistics and will cover topics such as your kernel as a menu items to menuconfig, setting defaults in the kernel config, registering network callbacks for specific types of packets taking Cisco CDP as an example and some tips-tricks in writing and debugging kernel code. A lot of my own learning has been through blogs and experiments. One source that is really great and does summarize a lot of what my blog will talk about and more is TLDP (The Linux Documentation Project).
When there's need to perform operations without cpu cycles wastage and/or reduce user space copy overheads, kernel programming suits the bill. Taking networking and linux networking stack as Continue reading
The Simple Leads to the Spectacular
Steve Kerr, head coach of the record setting Golden State Warriors (my local Bay Area NBA basketball team), has this to say about what the team needs to do to get back on track (paraphrased):
What we have to get back to is simple, simple, simple. That's good enough. The simple leads to the spectacular. You can't try the spectacular without doing the simple first. Make the simple pass. Our guys are trying to make the spectacular plays when we just have to make the easy ones. If we don't get that cleaned up we're in big trouble.
If you play the software game, doesn't this resonate somewhere deep down in your git repository?
If you don't like basketball or despise sports metaphors this is a good place to stop reading. The idea that "The simple leads to the spectacular" is probably the best TLDR of Keep it Simple Stupid I've ever heard.
Software development is fundamentally a team sport. It usually takes a while for this lesson to pound itself into the typical lone wolf developer brain. After experiencing a stack of failed projects I know it took an embarrassingly long time for me to Continue reading
Featured Webinar: Leaf-and-Spine Designs
The featured webinar in March 2016 is the Leaf-and-Spine Designs update to the Leaf-and-Spine Fabrics webinar, and in the featured videos (the ones marked with a star) you'll find in-depth explanation of BGP features available in Cumulus Linux, including a cool trick that allows you to run EBGP sessions across unnumbered interfaces.
Read more ...Docker Swarm Exceeds Kubernetes Performance at Scale
There are people who will tell you that the community has made up its mind when it comes to container orchestration. The reality could not be further from the truth. A recent survey, of over 500 respondents, addressing questions about … ContinuedSA Homes Loans Trusts Docker Datacenter with Embedded Swarm To Enable Microservices and Portability
SA Home Loans is a mortgage finance provider dedicated to dedicated purpose: to offer our customers the best in every service – from origination and credit approval through to registration and ongoing loan servicing. The company was launched to South … ContinuedWorth Reading: Carrier Supporting Carrier
The post Worth Reading: Carrier Supporting Carrier appeared first on 'net work.