Internets of Interest for 16th March 2012


Collection of useful, relevant or just fun places on the Internets for 16th March 2012 and a bit commentary about what I’ve found interesting about them:

Cisco Catalyst 2960 – Feature Matrix
– Download this and keep it safe. The only thing I ‘ve seen that explains the differences between the different models of C2960 switches.

I hate buying these things because the product information is so bad I’m never sure what I’m buying – just what are the feature differences between the licenses ? And every three months the product licensing has changed, so I have to start again. I’m tired of spending two days researching a product that costs less than one day internal chargeback and usually just buy a HP switch instead. It’s just simpler.

VXLAN and EVB questions « by @ioshints – Ivan does a great job of covering todays problems of software switching and tunneling by answering questions. A must read if you are into Data Centre Fabrics.

Are SSD-based Arrays a Bad Idea? » | Nimble Storage – Enjoyed this quote as part of a discussion about the suitability of SATA/SAS as an interface to SSD drives (which does seem kind of dumb – SATA/SAS interfaces don’t take advantage of Flash memory performance).

Pure flash is like pure gold—dazzling, but unsuitable for the vast majority of practical uses. It needs to be “hardened” with hard disks.

Timely reminder.

Is Dell The New HP? Or The Old IBM? | The Networking Nerd – Tom sums up the Dell acuisition of SonicWall and I agree with his points.

So far, reaction to the Sonicwall purchase has been overwhelmingly positive. It sets the stage for Dell to begin to compete with the Big Boys of Networking across their product lines. It also more or less completes Dell’s product line by bringing everything they need in-house. They only major piece they are still missing is wireless.

End-of-Sale and End-of-Life Announcement for the Cisco ACE Application Control Engine Module Software Licenses for ACE Module 10 and ACE Module 20  [Cisco Services Modules] – Cisco Systems – And so passes the ACE-10 and ACE-20 modules wherein many weekends and nights wasted solving bugs and memory leaks. I lament them not and say good riddance. Hopeful that ACE-30 modules will be more reliable with the new software but not expecting much.

Network Mechanics to Network Conductors |

In some regards the move towards Software Defined Network is an outcry of the frustration in managing an ever, complex set of interrelated components. Data centers have become huge information factories; servers themselves have become cluster of computers and our data hungry applications require massive amounts of parallel computing driving even more demand into the network. We could continue to take a ill-suited feature-driven approach to networking or we could take the opportunity to recognize what are the architectural principals to networking which would turn it from a craft to a science (not withstanding the argument on true science).

I can agree with this part, at least. The rest of the article is someone who is new to SDN and needs to move through the denial phase to acceptance – but that’s a road that we all will walk in the next few years.

Arista’s Adaptable Approach to SDN | Twilight in the Valley of the Nerds

What Brad calls “adaptable” I call “volte face” or “flip flop”.

Good thing that EOS is extensible, after all,  you can always change your mind later in software – that merchant silicon lets your resources focus on changing the software roadmap.

Minimum Recommended Cisco NX-OS Releases for Cisco Nexus 7000 Series Switches  [Cisco Nexus 7000 Series Switches] – Cisco Systems

This document lists the minimum recommended Cisco NX-OS software release for use with Cisco Nexus 7000 Series switches for both new deployments and existing deployments. Since these are minimum release recommendations, more recent software releases can be used to take advantage of newer hardware and software capabilities. These recommendations are general and should not replace environment specific design review efforts.

Because choosing software for Cisco products is way too hard.

GPS ‘spoofers’ could be used for high-frequency financial trading fraud (Wired UK) – Funny how things come around. I’m pretty sure in a previous life that we rejected the use of GPS enabled NTP sources for this very reason and went with atomic clocked systems.

GPS “spoofers” — devices that create false GPS signals to fool receivers into thinking that they are at a different location or different time — could be used to defraud financial institutions, according to Todd Humphreys from the University of Texas.

Nexus load intervals « Routing-Bits – Nice tip from Ruhann –

I discovered an addition to this command on the Nexus the other day while poking around. NX-OS allows multiple counter intervals to be configured on the same interface. This allows different sampled intervals to be listed at the same time.

  • Josh B.

    Small comment regarding the Dell acquisition of SonicWall. It was noted that they still need Wireless. SonicWall does have a wireless product line that can be centrally managed via their firewall management infrastructure. It isn’t the best but it does work.

  • K Klefisch

    I really like the new Cisco “Scanning Tree” feature in the Catalyst 2960 overview 😉

  • Gary Berger

    BTW I am neither new to SDN nor in denial. I have been involved with SDN and OpenFlow for over two years, designed an OpenFlow controller and have been a network designer for over 20 years

    • Etherealmind

      Wasn’t implying that you were new to SDN, was suggesting that the article was a walkthrough for someone new to SDN.