Non-Stop Forwarding (NSF) is one of those ideas that look great in a slide deck and marketing collaterals, but might turn into a giant can of worms once you try to implement them properly (see also: stackable switches or VMware Fault Tolerance).
Usually interviews are not supposed to make the person anxious and uncomfortable. As a part of an interviewer the questions should be asked in an extremely comfortable yet appropriate way, which does not make the person feel like he is being scrutinized or grilled. There are multiple techniques and ways to go about this process. However, when the interviewer asks the person whether or not they want to ask any questions regarding the company, their role, the job or position being offered, here are a few questions that can easily make one understand and get a deeper insight on what is being offered to them.
One needs to understand that as much as being able to answer the interviewer’s question is important; it is also considerably important to ask them the following significant questions. This will make them come off as a well balanced, ideal, and informative person which in return can help them stand out from others.
Getting a deeper insight on the functionality of the job is extremely ideal and appropriate to ask during an interview. One has to know what their daily work load, their responsibilities, and the expectations could Continue reading
I have been using the awesome window manager for 10 years. It is a tiling window manager, configurable and extendable with the Lua language. Using a general-purpose programming language to configure every aspect is a double-edged sword. Due to laziness and the apparent difficulty of adapting my configuration—about 3000 lines—to newer releases, I was stuck with the 3.4 version, whose last release is from 2013.
It was time for a rewrite. Instead, I have switched to the i3 window manager, lured by the possibility to migrate to Wayland and Sway later with minimal pain. Using an embedded interpreter for configuration is not as important to me as it was in the past: it brings both complexity and brittleness.
The window manager is only one part of a desktop environment. There are several options for the other components. I am also introducing them in this post.
One of my subscribers is trying to decide whether to buy an -EX or an -FX version of a Cisco Nexus data center switch:
I was comparing Cisco Nexus 93180YC-FX and Nexus 93180YC-EX. They have the same port distribution (48x 10/25G + 6x40/100G), 3.6 Tbps switching capacity, but the -FX version has just 1200 Mpps forwarding rate while EX version goes up to 2600 Mpps. What could be the reason for the difference in forwarding performance?
Both switches are single-ASIC switches. They have the same total switching bandwidth, thus it must take longer for the FX switch to forward a packet, resulting in reduced packet-per-seconds figure. It looks like the ASIC in the -FX switch is configured in more complex way: more functionality results in more complexity which results in either reduced performance or higher cost.
One of my subscribers is trying to decide whether to buy an -EX or an -FX version of a Cisco Nexus data center switch:
I was comparing Cisco Nexus 93180YC-FX and Nexus 93180YC-EX. They have the same port distribution (48x 10/25G + 6x40/100G), 3.6 Tbps switching capacity, but the -FX version has just 1200 Mpps forwarding rate while EX version goes up to 2600 Mpps. What could be the reason for the difference in forwarding performance?
Both switches are single-ASIC switches. They have the same total switching bandwidth, thus it must take longer for the FX switch to forward a packet, resulting in reduced packet-per-seconds figure. It looks like the ASIC in the -FX switch is configured in more complex way: more functionality results in more complexity which results in either reduced performance or higher cost.
A system is robust if the failure of some components doesn’t affect its function. As network engineers, we face various types of network failures like link, node failures all the time.
Generally, we use various Network modeling tools like Cariden(WAE), WANDL, etc. to model failures and see how the network reacts under a given failure condition. The components which are in play are:
In this blog post, we will focus purely on #4 Network topology and certain characteristics of topology, which may make them more robust than other topologies.
The network topology may have some critical nodes. If we can identify them and take them out of the service, they will significantly impact the functionality of the network. For example, in the case of a Hub and Spoke topology, if a Hub is out of service, it affects all the spokes vs. a spoke out of service. We can make this hub and spoke topology more Continue reading
Hello my friend,
It is been a while since we posted our last blogpost, which was touching Infrastructure aspects of building Multi Server Cloud with ProxMox. After summer break we continue our blogging and developing activities at Karneliuk.com. Today we’ll show some backstage of the software development of the pygnmi.
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In a nutshell, Automation and Network Automation are just subset of tasks from a broader topic called Software Development. With the move of the world towards Industry 4.0, the digital economy growth and others, all sort of applications are becoming more widely used. In order you create a history, and not being a part of that in the past, you shall know the principles of software development and be able to create applications yourselves. Sounds complicated? It may be, indeed. However, with our Network Automation Training you definitely will have a break-through in the software development world.
At our Continue reading
I wanted to take minute to talk about a story I’ve been following that’s had some new developments this week. You may have seen an article talking about a backdoor in Juniper equipment that caused some issues. The issue at hand is complicated at the linked article does a good job of explaining some of the nuance. Here’s the short version:
“Ingest it all, keep everything, find that needle in the haystack,” they exclaimed. …
Data Reduction is the Next IT Frontier was written by Nicole Hemsoth at The Next Platform.
Today's Heavy Networking podcast dives into academic research on DDoS attack techniques. Our guests have published a paper about how the TCP protocol and middleboxes such as firewalls can be weaponized by bad actors and used in reflective amplification attacks. We discuss technical details, how they performed this research, potential countermeasures, and more.
The post Heavy Networking 596: Weaponizing Firewalls And Middleboxes For DDoS Attacks appeared first on Packet Pushers.
Enterprises large and small that depend on Hewlett Packard Enterprise to build their systems and certify them for an absolutely enormous amount of software and support them during a long life in the field should send Thank You notes to the venerable systems maker. …
The Venerable Tenacity Of System Supplier HPE was written by Timothy Prickett Morgan at The Next Platform.
A friend of mine pointed out this quote by John Shoch when I started preparing the Network Stack Addressing slide deck for my How Networks Really Work webinar:
The name of a resource indicates what we seek, an address indicates where it is, and a route tells us how to get there.
You might wonder when that document was written… it’s from January 1978. They got it absolutely right 42 years ago, and we completely messed it up in the meantime with the crazy ideas of making IP addresses resource identifiers.
A friend of mine pointed out this quote by John Shoch when I started preparing the Network Stack Addressing slide deck for my How Networks Really Work webinar:
The name of a resource indicates what we seek, an address indicates where it is, and a route tells us how to get there.
You might wonder when that document was written… it’s from January 1978. They got it absolutely right 42 years ago, and we completely messed it up in the meantime with the crazy ideas of making IP addresses resource identifiers.
Ever since Nutanix, the first virtualized server-storage smashup, dropped out of stealth in 2011, we have been watching with great interest to see if this hyperconverged infrastructure would take the world by storm. …
If Hyperconverged Storage Is So Good, Why Is It Not Pervasive And Profitable? was written by Timothy Prickett Morgan at The Next Platform.