Maximally Redundant Trees
We’ve come almost to the end of our little series on fast reroute; in this episode we’ll look at maximally redundant trees (MRTs) — this episode is going to be a little “graphy,” so get your seatbelts on. The general idea behind IP fast reroute is to precalculate a set of alternate paths that can […]
Author information
2013 Recap and 2014 Goals
Wow - this one snuck up on me. Seriously, when I think of how 2013 went, I’m amazed at how much happened this year but also how fast it flew by. As per the tradition I started last year, I thought it prudent to write a post summarizing how terribly I was able to forecast 2013 in terms of personal goals, and make another feeble attempt at planning out 2014.2013 Recap and 2014 Goals
Wow - this one snuck up on me. Seriously, when I think of how 2013 went, I’m amazed at how much happened this year but also how fast it flew by. As per the tradition I started last year, I thought it prudent to write a post summarizing how terribly I was able to forecast 2013 in terms of personal goals, and make another feeble attempt at planning out 2014.2013 End of Year Blog Statistics
I debated whether to write an article like this. It seems to be the “in vogue” thing to do if you’re a blog author but I wasn’t inclined to do it until I started looking at the data (I heart data). When I started looking at the data, I saw not only number of visitors and so on to the blog, but a breakdown of browser versions and operating systems (thank you Google Analytics for the rich reports). As is often the case, your data set can tell you more than you initially bargained on.
All of the reports below are comparing year-over-year stats: Jan 1 2012 – Dec 29 2012 vs Jan 1 2013 – Dec 29 2013.
First, the overall picture of visits to the blog:
38% more overall visitors and 53% more unique visitors in 2013. Pretty cool! And over 58 thousand people put eyes on my blog in the past year. That’s something I hope to build on in 2014.
The first unexpected data point I saw is that in 2013, the blog saw more new visitors than in 2012. That means the readership is expanding to include new people which is excellent.
Next up Continue reading
2013 End of Year Blog Statistics
I debated whether to write an article like this. It seems to be the “in vogue” thing to do if you're a blog author but I wasn't inclined to do it until I started looking at the data (I heart data). When I started looking at the data, I saw not only number of visitors and so on to the blog, but a breakdown of browser versions and operating systems (thank you Google Analytics for the rich reports). As is often the case, your data set can tell you more than you initially bargained on.
Automatic host availability check
From version 0.9 on there is a option to automatically check statuses of configured hosts for selected subnets, and I received some related questions about it, so here is a short description and guide for it.
Firstly, pcntl support for php cli is advised so phpipam can do parallel icmp checks, this greatly reduces time required for checking status. You can check if your installation is ok with following command:
php -m | grep pcntl
1.) Configure the parameters for pinging
You should set required parameters for pinging, etc ping path etc under
functions/scan/config-scan.php
You can get your ping path by invoking “whereis ping” in terminal.
You can also set some optional parameters in script itself
functions/scripts/pingCheck.php
Also, set the time parameters for status under Administration > IPAM settings (Ping status intervals), phpipam will set host as down/up based on this values.
2.) Select which networks to check
Now you have to select which subnets should scan for statuses for configured hosts. Go to edit subnet and check “Check hosts status”. This will tell the cron script to check the status of hosts inside this subnet.
3.) Add cron script
I suggest checking Continue reading
Not Another CCDE Study Group
The world needs more network design experts.That's what I believe. That's what I see.
I will not call myself as a design expert. But I've been traveling intensively the past 6 months, meeting different customers in different countries, to conduct design workshops in multiple projects. I may not be the best but it seems like not many people can do what I do. Or willing to do what I do. Or combination of both.
No certification program can make you a design expert. Not even CCDE. You need all of the following three instead:
1. Network
2. Skills
3. Experience
Network or strong connection to many subject matter experts is crucial because I don't know anyone who is an expert in all the technologies and in different vertical industries. You need to know whom to ask. An expert is not the one who knows all the answers, but the one who knows how to find the answers.
Experience doing various design work can't be replaced with any certification. Experience to lead design workshop can't be tested in the exam. Experience to capture customer requirement, to present the proposed solution, and to defend it, is very difficult to be simulated Continue reading
A Christmas Binary Miracle
My brother got a little puzzle in his stocking this Christmas. It was a little cardboard booklet, and on each page was written a block of numbers, like so: BLOCK ONE 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 BLOCK TWO 2 3 6 7 10 11 14 15 18 19 22 23 26 27 30 31 34 35 38 39 42 43 46 47 50 51 54 55 58 59 62 63 BLOCK THREE 4 5 6 7 12 13 14 15 20 21 22 23 28 29 30 31 36 37 38 39 44 45 46 47 52 53 54 55 60 61 62 63 BLOCK FOUR 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31 40 41 42 43 44 45 46 47 56 57 58 59 60 61 62 63 BLOCK FIVE 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 BLOCK Continue readingA Christmas Binary Miracle
My brother got a little puzzle in his stocking this Christmas. It was a little cardboard booklet, and on each page was written a block of numbers, like so: BLOCK ONE 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 BLOCK TWO 2 3 6 7 10 11 14 15 18 19 22 23 26 27 30 31 34 35 38 39 42 43 46 47 50 51 54 55 58 59 62 63 BLOCK THREE 4 5 6 7 12 13 14 15 20 21 22 23 28 29 30 31 36 37 38 39 44 45 46 47 52 53 54 55 60 61 62 63 BLOCK FOUR 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31 40 41 42 43 44 45 46 47 56 57 58 59 60 61 62 63 BLOCK FIVE 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 BLOCK Continue readingShow 173 – War Stories From The Hot Aisle: The Nightmare Before Christmas, Part 1
“Everything is down! The whole network!! RUN AWAY, RUN AWAY!” Yes, we’ve all had those terrible days in networking, where no one can get to anything & it’s all up to you to get it fixed. At least management is there to help, stomping their feet, making demands, and whining about the dollars lost per […]
Author information
The post Show 173 – War Stories From The Hot Aisle: The Nightmare Before Christmas, Part 1 appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Healthy Paranoia Show 20: SDN – Heretic of Security
The known universe has been ruled by the monolithic network device. In this time, the most precious substance in the Universe is the ASIC. The ASIC extends life. The ASIC expands consciousness. The ASIC is vital, it provides the ability to fold space. That is, travel to any part of the network. The ASIC exists […]
Author information
The post Healthy Paranoia Show 20: SDN – Heretic of Security appeared first on Packet Pushers Podcast and was written by Mrs. Y.
Design Expert Weekend – 5W1H
This post is related to my new initiative called Design Expert Weekend.The pilot workshop for DEW: IPv4/IPv6 Routing Design, will be held in Olaya, Riyadh, on Friday-Saturday 3-4 January 2014.
What:
Design Expert Weekend in Riyadh on 3-4 January will focus on IPv4/IPv6 Routing Design. Agenda will cover:
- IGP IPv4 and IPv6 Design (OSPF, ISIS, EIGRP)
- BGP Design
- Routing scalability and Inter-AS
- Traffic Engineering
- Routing Fast Convergence and High Availability
- Multicast Routing Design
- CCDE exam tips and tricks
- CCDE sample questions and scenario to practice ability to analyze design requirements, develop network designs, implement network design, validate and optimize network design
The other two DEW will be held in separate session:
DEW:Tunneling Design (MPLS-based L3VPN/L2VPN, tunnel protection/MPLS TE, other tunnelling include IPv6 transition)
DEW:SP Design (Physical, L2, IGP/BGP/MPLS/PIM as transport, MPLS-based services, Internet, IPTV, HA, QoS, security, management)
Why:
To help network engineers to gain real design skills. DEW can help with CCDE exam preparation, and beyond.
Our main goal is not to make you certified. But to give the real knowledge. The real skills. Then to be certified or not it's your decision not ours.
Who:
Any network engineers/architects who Continue reading
Fast Reroute Mechanisms
Network reliability is an important measure for deployability of sensitive applications. When a link, node or SRLG failure occurs in a routed network, there is inevitably a period of disruption to the delivery of traffic until the network reconverges on the new topology. Fast reaction is essential for the failed element. There are two approaches […]
Author information
The post Fast Reroute Mechanisms appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
How portable is your network operating system?
Conversations are swirling throughout the tech industry about whether white box switches are disrupting the networking industry, similarly to how white box manufacturers helped commoditize the server industry. If this recent InfoWorld article, is not enough to persuade you, consider that even John Chambers himself has recently chimed in on the threat of white boxes eroding Cisco’s margins.
The idea of white box switching from a Pica8 perspective is to help create an operating abstraction between the “metal” (in our case white box switches from original device manufacturers, or ODMs) and the network operating system (OS) itself. When that’s created, you have a degree of OS portability.
In a typical first meeting with a prospect, we frequently get asked if they can port a version of our OS on their existing Cisco switches. At first blush, it makes sense but let’s examine the three key issues that need to be addressed to truly Continue reading
How many CCIEs are there in the world?
If you are trying to find out how many CCIEs there are in the world, you might find that these statistics are not readily available. Now why would Cisco want to stop publishing the figures for how many people are passing the CCIE? I am not sure but there are many theories, are there not […]
The post How many CCIEs are there in the world? appeared first on Roger Perkin - Networking Articles.
Nexus 7k – Getting Started Examples – Part1 (basics, VDC and vPC)
For best article visual quality, open Nexus 7k – Getting Started Examples – Part1 (basics, VDC and vPC) directly at NetworkGeekStuff.
So I finally had a project with Cisco Nexus switches to finally get hands on experience on these boxes. I am no longer a fanboy of Cisco, so just practically, this article is a summary of my notes and example configurations that I have put together as a documentation for myself and now I will kind of share them with you. First of all, when I started writing this article it was November 2013 and Nexus 9000 were just released, note that this articles is based on Nexus 7000 series and not the new 9000 series. Sorry, not chance to get to 9000 yet, maybe later.
Let’s get started. Similarly as with my previous IOS XR Getting Started Guide (part 1 and part 2), I will go over the very quick overview and then show basically a snapshots of configuring some elemental configurations. There is actually one advantage over the IOS XR in that the NX-IOS has and that is that it is more similar to the classical IOS we all know.
Basic commands to verify hardware, Continue reading
What is a “Best Practice”?
I see a lot of articles and even vendor whitepapers that like to throw the term “best practice” around like it’s pocket change. Truth be told, while there are plenty of general best practices that are recommended in any case, many of what a vendor will call “best practices” are usually just the most common response to an If/Then statement that represents the surrounding environment. Here’s a good example. I’ve heard on multiple occasions regarding the standard vSwitch in VMWare vSphere that it is a “best practice” to set the load balancing policy to “route based on the originating virtual port ID”.What is a “Best Practice”?
I see a lot of articles and even vendor whitepapers that like to throw the term “best practice” around like it’s pocket change. Truth be told, while there are plenty of general best practices that are recommended in any case, many of what a vendor will call “best practices” are usually just the most common response to an If/Then statement that represents the surrounding environment. Here’s a good example. I’ve heard on multiple occasions regarding the standard vSwitch in VMWare vSphere that it is a “best practice” to set the load balancing policy to “route based on the originating virtual port ID”.[minipost] Create a loopback hard-drive partition inside a file in linux
For best article visual quality, open [minipost] Create a loopback hard-drive partition inside a file in linux directly at NetworkGeekStuff.
This article is really just a quick documentation for something that I do almost each year, and each year I must google-search how I did the last time. So from now on I will have it in my own notes …. here!
Mu current problem was that I have VPS system from a small provider hpcloud.com 
, but the base image is divided to 10 GB of system partition and another 20 GB of data partition. And as luck would have it, I needed 25 GB for data. One of the options was to buy more storage, but I have seen that my minimalistic debian hardly used more than 1,7 GB from the 10 GB system space and I wanted to make use of the remaining space.
Additionally, resizing the partition was not an option as this was the provider mandatory separation, so I decided to use a loopback file emulating a hard-drive.
What this means is that I will create a 5 GB file in the system partition, and mount it as a directory in the data partition, Continue reading