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Concept of Local Preference in BGP : BGP Attribute

Today I am going to talk about the BGP attribute which is widely used in many of the enterprise networks. BGP attribute name "Local Preference" is used for controlling outbound traffic in the network. It actually used when we have two different paths and want to select the preference path then we are going to use the local preference by putting the higher local preference value to the route.

Local Preference is not local to the router, the local preference attribute is part of the routing update and is exchanged among routers in the same AS. So if you applied local preference in your network it will effect the network part which is under same AS.

We have two different method to apply the local preference in the network. The one way is to use the bgp default local-preference command and the other way is by using the route-map to set the local preference. I will cover the configuration part of the both the ways in the network.

Below is the basic topology where we are using the local preference in the enterprise network. The topology and the IP addresses uses here below is for the demo purposes and has Continue reading

New design of www.orhanergun.net

I used to receive many queries on design of website and we did few changes. Changes especially on the homepage. Previously the blog posts were in the orhanergun.net/blog and we moved them to homepage. So they are now accessible directly from the homepage which is www.orhanergun.net Also, added an announcement section to homepage where you will […]

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Netmiko Getting Started

Netmiko is a python library created by a living legend amongst network engineers, Kirk Byers. Netmiko aims to simplify SSH connections to network devices with python by extending the paramiko library to deal with the idiosyncrasies of SSHing to our favorite network gear. Netmiko has a huge...

Netmiko Getting Started

Netmiko installation and basic usage.

Manually Installing Azure CLI on Fedora 25

For various reasons that we don’t need to get into just yet, I’ve started exploring Microsoft Azure. Given that I’m a command-line interface (CLI) fan, and given that I use Fedora as my primary laptop operating system, this led me to installing the Azure CLI on my Fedora 25 system—and that, in turn, led to this blog post.

Some Background

First, some background. Microsoft has instructions for installing Azure CLI on Linux, but there are two problems with these instructions:

Official packages that can be installed via a package manager are only provided for Ubuntu/Debian. Clearly, this leaves Fedora/CentOS/RHEL users out in the cold.
Users of other Linux distributions are advised to use curl to download a script and pipe that script directly into Bash. (“Danger, Will Robinson!”) Clearly, this is not a security best practice, although I am glad that they didn’t recommend the use of sudo in the mix.

Now, if you dig into #2 a bit, you’ll find that the InstallAzureCli script you’re advised to download via curl really does nothing more than download a Python script named install.py. The install.py Python script really just uses pip and virtualenv to install the Azure Continue reading

Cisco CSR 1000v Vagrant Box Install

This blog covers how to install Cisco csr1000v boxes for use with Vagrant. Cisco does not provide a csr1000v Vagrant box so similar to my other post on creating a Vagrant box from the ASAv ova, I will show you how to create a csr1000v Vagrant box. This post assumes that you already have a...

Cisco CSR 1000v Vagrant Box Install

How to install a Cisco CSR 1000v Vagrant box.

Very important update on CCDE Practical Exam Result !

As you might know May 2017 exam was cancelled due to leakage and I shared a post on it on May. It was very important step taken by Cisco to secure the exam. Now, it seems another important step is taken by Cisco. Below message sent by Pearson to the CCDE Practical […]

The post Very important update on CCDE Practical Exam Result ! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Downloading YouTube Videos From Links Saved In Google Chrome Bookmarks

The Bash script youtube-bookmarks-mp3.sh is using Python youtube-dl script along with ffmpeg in order to download videos from YouTube service. It also enables youtube-dl to convert videos to mp3 audio format. The script exports YouTube links from Bookmarks and copy them into the file bookmarks.txt. Multiple videos are downloaded and converted simultaneously in the background by the script.

Note: According to YouTube Terms of Service, you shall not copy, reproduce, distribute, transmit, broadcast, display, sell, license, or otherwise exploit any Content for any other purposes without the prior written consent of YouTube or the respective licensors of the Content.

Checkpoint Portals

All Checkpoint portals are configured under the Gateway properties.
The IP address of the portal must be that of an IP of an interface on the checkpoint (loopback or physical).
Can either use a different IP for each portal or the same IP for all portals. All portals with the same IP address use the same certificate.

Virtual Reality and Skeuomorphism

Remember skeuomorphism? It’s the idea that the user interface of a program needs to resemble a physical a physical device to help people understand how to use it. Skeuomorphism is not just a software thing, however. Things like faux wooden panels on cars and molded clay rivets on pottery are great examples of physical skeuomorphism. However, most people will recall the way that Apple used skeuomorphism in the iOS when they hear the term.

Scott Forrestal was the genius behind the skeuomorphism in iOS for many years. Things like adding a fake leather header to the Contacts app, the wooden shelves in the iBooks library, and the green felt background in the Game Center app are the examples that stand out the most. Forrestal used skeuomorphism to help users understand how to use apps on the new platform. Users needed to be “trained” to touch the right tap targets or to feel more familiar with an app on sight.

Skeuomorphism worked quite well in iOS for many years. However, when Jonny Ive took over as the lead iOS developer, he started phasing out skeuomorphism starting in iOS 7. With the advent of flat design, people didn’t want fake leather and Continue reading

Worth Reading: Deep dive into Sky Lake

The architecture of Skylake is very different from that of the prior “Haswell” and “Broadwell” Xeon chips, and will be carried forward with the next-generation “Cascade Lake” processors that will very likely be implemented in a highly tuned 14 nanometer process – what Intel calls 14++ nanometer in its chip manufacturing presentations. (We had not heard of Cascade Lake before, and assumed future Xeons would be based on the “Kaby Lake” design already implemented in the Xeon E3 chips for single-socket servers.) The point is, the Socket P form factor for Xeon SP processors will be used for at least two generations of server chips, and possibly more. —Timothy Prickett Morgan @ The Next Platform

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Nvidia Is A Textbook Case Of Sowing And Reaping Markets

In a properly working capitalist economy, innovative companies make big bets, help create new markets, vanquish competition or at least hold it at bay, and profit from all of the hard work, cleverness, luck, and deal making that comes with supplying a good or service to demanding customers.

There is no question that Nvidia has become a textbook example of this as it helped create and is now benefitting from the wave of accelerated computing that is crashing into the datacenters of the world. The company is on a roll, and is on the very laser-sharp cutting edge of its …

Nvidia Is A Textbook Case Of Sowing And Reaping Markets was written by Timothy Prickett Morgan at The Next Platform.

One Small Step Toward Supercomputers in Space

While it is not likely we will see large supercomputers on the International Space Station (ISS) anytime soon, HPE is getting a head start on providing more advanced on-board computing capabilities via a pair of its aptly-named “Apollo” water-cooled servers in orbit.

The two-socket machines, connected with Infiniband will put Broadwell computing capabilities on the ISS, mostly running benchmarks, including High Performance Linpack (HPL), the metric that determines the Top 500 supercomputer rankings. These tests, in addition to the more data movement-centric HPCG benchmark and NASA’s own NAS parallel benchmark will determine what performance changes, if any, are to be …

One Small Step Toward Supercomputers in Space was written by Nicole Hemsoth at The Next Platform.