How does the internet work - We know what is networking
In my current studies I did some work about security inside networking data paths. In my recent work I tried to get some experiments done that needed to use source based routing in order to be completed. Like most of scientific work that tries to get from paper to experiment and then to something useful, it failed […]
Original content from Roger's CCIE Blog Tracking the journey towards getting the ultimate Cisco Certification. The Routing & Switching Lab Exam
I have been trying to configure things faster and faster as a bit of personal challenge to myself recently. It is only when the clock is on you that you start to panic. So I have a little challenge. Configure PPPOE between two routers in under 60 seconds. This is the topology This is the […]
Post taken from CCIE Blog
Original post PPPOE Speed Challenge
After I get an interesting if it is not weird question about switch selection from someone couple days ago I decided to share my ideas about this specific and actually important topic. Question was exactly like this; ‘ Which one I should buy 24 port or 48 port switch ‘. What would you give […]
The post Give me one 24 port switch please ! appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
I’ve spent a lot of time researching the hardware and technology that goes inside switches and routers. In part this is because I’m in the early stages of a book on White Box Networking where I needed to be able to put together information about the technology but really because software can only deliver what […]
The post The Hardware Inside Your Network Device appeared first on EtherealMind.
This is Part 2 in a special series looking at the silicon and hardware inside your network device. Although software will be at heart of network innovation, it will still run on hardware and it’s time to expose the internals of our network hardware and understand the hardware architecture inside a typical device. Many people […]
The post Show 187 – The Silicon Inside Your Network Device – Part 2 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
This blog post is written by Steve Francis, Founder and Chief Product Officer, LogicMonitor. LogicMonitor is a SaaS-based IT infrastructure monitoring company, monitoring the performance, capacity and availability of thousands of different kinds of devices and applications for thousands of customers. Where possible, we don’t rely on SNMP traps – and neither should you. “Why […]
The post Don’t Get Trapped by Traps appeared first on Packet Pushers Podcast and was written by Sponsored Blog Posts.
So your host queries a DNS server to map the name to a location (an IP address), which sets off a chain of queries across a number of servers throughout the Internet. But who pays for all these servers, and how do they make money? To understand the answer to these questions, we need to […]
Wireshark 802.11 frame type and subtype display filters to quickly sort packet captures.
At the moment I’m going through whitepapers, Cisco Live 365 presentations and IOS XR fundamentals learning about switching fabrics.
Its a steep learning curve, but in its own way its quite fascinating.
There are a lot of acronyms to be mastered, so later on i will post a list that might serve myself and others when looking at these sort of architectures.
Like it or Not, You ARE in the Customer Service Business
Unless you work in research and development, where the value of your work may not be realized for many years, you are in the customer service business. That’s everyone from sales to finance to engineering.
I find this statement is a great conversation starter because it invariably gets mixed reactions.
Sales people and customer service representatives who are already close to the customers nod politely at this self-evident truth. The statement causes barely a ripple, because people in these roles meet with customers each day. They hear about customer goals, needs, and problems and help address the variety of issues that customers face.
People who work in supporting roles like human resources or finance often respond with raised eyebrows. The accounts receivable group may only rarely meet with the customers who pay the bills. And human resources teams, for example, sometimes fail to recognize that their efforts to establish retirement and insurance plans impact the quality of talent a company can attract. They may miss the connection between hiring the best people and strong financial Continue reading
In my last EEM post I provided a simple means to change an IP address and default route of a Cisco router using a script that makes the change without requiring interactive user input. This is helpful if you are remotely changing a device’s WAN/Internet IP and waiting for some on-site hands to move a cable over to a new ISP or WAN SP connection. That first script, however, would make the change and then exit. What would happen if the new Internet connection had a problem, or the on-site help couldn’t move the cable for some reason? Proper testing and preparation should help you avoid most of those issues but you just never know.
One way to deal with this possibility is to issue a “reload in 10” before kicking off the EEM change script. If the change can’t be completed, the router will reboot back to its previous configuration. That’s fine, but I like to avoid a full reboot whenever possible, and “reload in” has always been a rather clunky rollback mechanism.
Another idea mentioned by Jody Lemoine in the comments of the last post, is taking advantage of the newer configuration archive and rollback features. While my Continue reading
It's been a few weeks since Cisco announced OpFlex and I've just finished gathering my thoughts...
It's been a few weeks since Cisco announced OpFlex and I've just finished gathering my thoughts...
It's a protocol for delivering policy to endpoints. Policy is declarative, based on promise theory and can therefore scale well vs. imperative models (like OpenFlow)
Kyle Mestery assures us that OpFlex is not an OpenFlow killer and while I agree, I'm starting to have my doubts. Vendors have been dragging their heels when it comes to implementing OpenFlow due to its pipeline and table structures not being a good fit to current hardware. OpFlex offers them a way out as they no longer need to care "how" something is implemented, just that the "promise" is kept (read: policy is enforced).
I can see Cisco deploying OpFlex across their entire portfolio and declaring victory - we've got SDN. Who cares about OpenFlow? This begs the question of whether OpFlex is just a move from Cisco to protect it's core business?
The future of networking is "Open"
The key benefit to using OpenFlow is disaggregation. It's beneficial to everybody for the proprietary stack to be broken down to allow Continue reading
