IGP Route Multipathing

Nexus 7000 IO Module SKU Cheat Sheet

Wow the title of this post is a mouthful.

Similar to my previous post on the Nexus 2000 (Nexus 2000 Model Number Cheat Sheet), this post will explain what the letters and numbers mean in the Nexus 7000 IO module part numbers. This will allow you to quickly identify the characteristics of the card just by looking at the part number which in turn should help you out as you're building BOMs and picking the right card for the job.

Update July 2, 2013: Updated to reflect release of the Nexus 7700 and F3 modules.

A Data Center Delivers Apps – So Shouldn’t We Monitor App Delivery?

Dinner with His Toadishness, Derick Winkworth, the other night rolled into a 3+ hour discussion of avant garde ways to do networking. One of the adjunct topics that came up was that of ownership within IT. Ownership is a complex problem in the data center, because there’s many complex technologies at work. No one single […]

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Ethan Banks

Co-host at Packet Pushers

Ethan Banks, CCIE #20655, has been managing networks for higher ed, government, financials and high tech since 1995. Ethan co-hosts the Packet Pushers Podcast, which has seen over 3M downloads and reaches over 10K listeners. With whatever time is left, Ethan writes for fun & profit, studies for certifications, and enjoys science fiction. @ecbanks

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The post A Data Center Delivers Apps – So Shouldn’t We Monitor App Delivery? appeared first on Packet Pushers Podcast and was written by Ethan Banks.

Machine Fragile

Yesterday, a “breaking news” tweet at 1:07 PM EDT from the Associated Press reported that two explosions had occurred at the White House and President Obama had been injured. The news immediately sent the Dow Jones Industrial Average down 143 points, as this graph at the London Telegraph shows. There’s also a lovely animated display […]

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Russ White

Principal Engineer at Ericsson

Russ White has scribbled a basket of books, penned a plethora of patents, written a raft of RFCs, taught a trencher of classes, nibbled and noodled at a lot of networks, and done a lot of other stuff you either already know about — or don't really care about. You can find Russ at 'net Work, the Internet Protocol Journal, and his author page on Amazon.

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The post Machine Fragile appeared first on Packet Pushers Podcast and was written by Russ White.

Quiz #13 &#8211 Frame Relay self pinging

You have recently joined a new company that still uses Frame Relay. For monitoring purposes, you implement a script that pings all interfaces of a router, but you notice that some of them are not ping-able. Why ?

It Works and It Should Be Better

You say, “It works – don’t fix it.” I hear, “It works – don’t touch it.” I’m also thinking that if you don’t touch it, then it’s never upgraded or changed. Is a static, unchanged network the best you can do to support your business ? Are you happy with just doing more of the same […]

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Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

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The post It Works and It Should Be Better appeared first on Packet Pushers Podcast and was written by Greg Ferro.

What can you learn in 5 minutes a day !

Your Job Hunt is YOUR Responsibility

Earlier this week, I read the article below. This article took a strong stance that a recruiter works for the employer, not those seeking employment. I think there are some valid points made. However, my views are a little less extreme than that of the author. NEWSFLASH: A Recruiter is Not a Job Finder!. Frankly, […]

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Paul Stewart

Paul is a Network and Security Engineer, Trainer and Blogger who enjoys understanding how things really work. With nearly 15 years of experience in the technology industry, Paul has helped many organizations build, maintain and secure their networks and systems. Paul also writes technical content at PacketU.

The post Your Job Hunt is YOUR Responsibility appeared first on Packet Pushers Podcast and was written by Paul Stewart.

FusionIO Acquires Nexgen

FusionIO Acquires Nexgen

Notes On AAA

Enabling aaa new model means the switch will try and match all login attempts using a aaa method.

First, define the TACACS or RADIUS server using:

tacacs-server host <IP-address> <optional key value>

There are some other values you can use, but I’ve never had to use these.

Now, give your authentication method a name:

aaa group server tacacs+ <method-name>
 server <IP-address>

Call the method for authenttication

aaa authentication login default group <method-name> group <fallback method name if configured> local

You should now be good to go!

DHCP client testing tool

Programming 101 for Network Engineers – Preparation

Okay, let’s say you’re convinced you need to learn to programme and you don’t want to be left behind. The earlier you start, the more you can pick up (and the sooner you’ll become consciously competent) at a pace that suits you. Hopefully, you’ll be able to blend this into your schedule with whatever else you […]

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Steven Iveson

Steven Iveson, the last of four children of the seventies, was born in London and has never been too far from a shooting, bombing or riot. He's now grateful to live in a small town in East Yorkshire in the north east of England with his wife Sam and their four children.

He's worked in the IT industry for over 15 years in a variety of roles, predominantly in data centre environments. Working with switches and routers pretty much from the start he now also has a thirst for application delivery, SDN, virtualisation and related products and technologies. He's published a number of F5 Networks related books and is a regular contributor at DevCentral.

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The post Programming 101 for Network Engineers – Preparation appeared first on Packet Pushers Podcast and was written by Steven Iveson.

Playing with event-scripts

Playing with event-scripts

DCI Series: Overlay Transport Virtualization

Routing iSCSI Traffic

Routing iSCSI Traffic

Fabricpath Design, Think it Through! – part 1

Arduino: Using my MelodyUtils library for R2-D2 style chirps

As part of a small robotics project I've been working on this weekend (affectionately called CoBe1, there will be a follow up blog on that soon) I decided to give by robot some personality in the form a a voice, and uploaded some of my code to GitHub.

While Arduino is capable of playing music and sounds from an SD Card I wanted something a little more authentic… something similar to R2-D2's chirps from Star Wars. I had a mini 8Ohm speaker lying around and following the tutorials here it was easy to get it hooked up to my Arduino Uno and start making sounds. By adjusting the default melody and timings I got part way to achieving my R2-D2 style attitude, but notes on their own just didn't cut it. What I needed was some articulations. I got coding and whipped up a library that makes it easy to use glissando and tremolo. Want to give it a try? Grab the code on GitHub Here's a simple example sketch:

#include <pitches.h>;

void setup()
{
MelodyUtils mel(8);
mel.Glis(NOTE_C3, NOTE_C4, 5);
delay(1000);
mel.Trem(NOTE_C3,  Continue reading