I am lucky to work in an ISP field, and of course, many of my friends who are not familiar with the Internet design, always ask me every time : why my Internet is slow, why the speedtest results are lying, why, why, and why …
Every time I am trying to explain it with the best intentions, but in the end it exhausts me mentally…
However Internet speedtests can have important place in our everyday life (yeah I am not joking lol), but also in the economic development of the ICTs(and again, yeah, I am not joking), since many rankings and studies are based on these results.
However, how far these speedtests are accurate and how should we interpret the results?
We know that BGP is an algorithm based mainly on shortest as-path. It does not care primary about bandwidth provisions that is why we are brought to setup traffic engineering processes.
On the other hand, speedtests just give you numbers related to your ping and bandwidth, but do not care at all about the shortest-as-path. We know all that the nearest geographical location or a good ping do not mean the best path, even worse.
Well I think there is some interesting substance to work in there. I hope to finish this new material soon.
If someone wants to participate, just contact me, you are welcome.
Ok, it has been a long time that i did not update the blog (annoying work, the change gives a break sigh).
First even if it is late, happy new year 2014 to everyone.
There are bad years, and legendary bad years. I hope that 2014 will be the contrary …
Anyway i am quite satisfied, of the number of visits, it seems that my tutorial could help some visitors.
I still have questions from visitors too …
These questions are really helpfull, it helps to improve the material, and soon i will be up to release an improved version, with more detail where it was lacking.
Thx for your support.
For visitors or readers looking for information on BGP loop prevention, and does not want to read all the complete tutorial, i will point them to these parts of the tutorial.
For BGP loop prevention within an AS, or Ibgp loop prevention based on Split-horizon mechanisms, plz read the following pages :
- p29 to p31 of the tutorial(pdf) in download section
- or go here : A.5.b) Ibgp loop prevention: “split-horizon” mechanism
For BGP loop prevention between different ASs, or ISPs, which is a very important notion to understand when u are confronted to build a network with multihoming, redundancy and link failure options, plz read the following pages. As-path attribute allow ebgp loop prevention.
However the concept of BGP loop between ISPs or different ASs is very tricky since this is not something that you can experience in your own network. You will be more likely victim of it, particularly if your traffic engineering redundancy case has not been fully tested. I will even say that ebgp loop prevention is mainly related to peering agreements betweens ISPs.
This is deeply explained though the tutorial, but the four following sections are sufficient to make a clear outlook.
1)Presentation of the network implemented through the study-case
- p8 to p11 of the tutorial(pdf) in download section
- or go here : I.2) Overview of the study case: BGP tutorial , best practices and multihoming techniques on ISP proposing IP transit services.
and here : I.3) Bandwidth Planning and Provisioning for load-balancing features.
2) Peering agreement between the upstream/transit providers
- p16 to p17 of the tutorial(pdf) in download section
- or go here : A.2.b) Peering agreement between the upstream/transit providers
3) Ebgp loop prevention mechanism based on as-path attribute
- p27 to p28 of the tutorial(pdf) in download section
- or go here : A.5.a) Ebgp loop prevention mechanism based on as-path attribute
4) Observations and commentaries of the results and the redundancy scenarios.
- p74 to 84 of the tutorial(pdf) in download section
- or go here : C.1) Observations and commentaries of the results and the redundancy scenarios.
I was looking on the stats of the blogs, it seems that some specific subjects are searched by readers. I will try to make specific posts on these topics, since the aim is to allow readers to find quickly the researched subject and not be obliged to run all the website or the tutorial of 110 pages.
At least, the site was not updated since 3 weeks, lot of silly works issues and health troubles.
By the way i am seeing that the site got visitors, i am glad for that, and if people want to contribute with some articles or critics, it is welcomed.
BGP is a very specific topic on networking, i am trying to give through my tutorial a simple approach but also a practical example, which allow to work on it directly within an ISP.
Not an easy task, some readers will find the article nice, others too simple.
Well whatever it is, please send me critics by mail.
Thx a lot