Decide!
Last week we talked about orienteering — using models and information to orient ourselves to what’s going on in the network. This is part of the OODA loop, which we talked about two weeks ago. This week, let’s look at the next step — decide.
In fact: Decide! Now! How many hours have you spent thinking through what to decide? Which car to buy, which house to buy, which vacation to take, which… It seems like our life is a continuous stream of decisions through which we must dig deeply to make a choice. Sometimes it makes you want to replace your entire outfit with grey and black. Everything. Actually, we should feel blessed to have so many decisions — at least we’re not considering “eveningvear…” (note the ever fashionable flashlight).
But the last place you want to be is in the middle of a major network outage or attack, spending hours deciding — what was it we were deciding? By the time you get to the fifth pizza and the tenth box of bonbons, maybe you’ve forgotten what you are sitting in that “war room” for. There is another alternative, of course.
Decide what you’re going to decide before Continue reading
CCIE vs CCDE
Probably one of the mostly asked questions by the networking experts. CCIE vs CCDE. How many times you asked yourself or discussed with someone else about this ? I think many times. right ? I have CCIE Routing Switching and/or Service Provider, should I continue to Design certificates such as CCDE or should I study… Read More »
The post CCIE vs CCDE appeared first on Network Design and Architecture.
HTIRW: Reality at the Mic (1)
We’ve talked a little about the structure of the IETF, and the process a draft follows when moving from submission to draft to RFC… The perennial question is, though — why does it take so long? Or, perhaps — why is the IETF so broken? Let me begin here: the IETF is a human organization. […]
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The post HTIRW: Reality at the Mic (1) appeared first on Packet Pushers Podcast and was written by Russ White.
Estimating BGP Convergence Time
One of my readers sent me this question:
I have an Internet edge setup with two routers connected to two upstream ISPs and receiving full BGP routing table from them. I’m running iBGP between my Internet routers. Is there a formula to estimate convergence time if one of my uplinks fail? How many updates will I need to get the entire 512K routes in BGP table and also how much time it would take?
As always, the answer is it depends.
Read more ...Install Mininet on an Amazon EC2 server
To install the Mininet SDN network simulator on a remote server running on Amazon’s EC2 cloud1, follow the procedure shown below. After installing it, I did some basic tests and it seems that Mininet works well on the Amazon EC2 server.
From my laptop PC, I connect to the Amazon EC2 instance via SSH. In the example below, the server’s private key file AWS-PrivateKey.pem is stored in the folder ~/AWS and the server’s public IP address is 55.155.1.55. I had previously created a new user brian on the server.
brian@Laptop:~$ ssh -X -i ~/AWS/AWS-PrivateKey.pem [email protected]
To install the latest stable version of Mininet, plus all supporting software, execute the following commands on the Amazon EC2 server running Ubuntu Server 14.04.
brian@AWS:~$ sudo apt-get install git
brian@AWS:~$ git clone git://github.com/mininet/mininet
brian@AWS:~$ mininet/util/install.sh -a
To test the installation, run the following command:
brian@AWS:~$ sudo mn --test pingall
The benefit of installing Mininet on a remote server such as an Amazon EC2 instance is that I can now experiment with Mininet from any computer, including a tablet or smartphone, at any time as long as I have a connection Continue reading
CCIE R&S — By the Numbers
When I started studying in earnest for my CCIE, I started a log of how I was spending my time studying, which books and papers I'd read, videos I'd watched, and so on. I thought it would be a neat exercise to look back afterwards at what it took to achieve this goal. I'm also somewhat self-deprecating and tend to minimize my accomplishments, so having this data is a way for me to remember that this wasn't a small accomplishment at all.