Welcome!

Rethinking the Network

Marten Terpstra

Subscribe to Marten Terpstra: eMailAlertsEmail Alerts
Get Marten Terpstra via: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


Top Stories by Marten Terpstra

A while ago I wrote a few articles describing the various tunnel protocols used for network virtualization between vSwitches on servers, and between vSwitches and physical network gateways. These are the mechanisms that construct overlay networks on top of a physical network. VMWare uses STT as the tunneling mechanism between vSwitches on servers and VXLAN to communicate with gateways to the non virtualized world. NVGRE is used mostly by Microsoft, and is an extension to GRE tunneling that has been around for a while. Each one of these mechanisms have their pros and cons. They are all pretty much standard, or at least published by a standards organization, and multiple implementations exist of most of them. Outside of my complaint about the stream like nature of STT, the biggest problem with all of them is the fact that they are fixed in their definition. The head... (more)

Brainrules: a Different Kind of Attachment

I don't read nearly as much as I should. On plane rides I tend to grab a Vince Flynn, James Patterson or David Baldacci, they are usually enough to entertain me on the way there and back. One of the more interesting books I have read in recent years that does not include murderers, spies and explosions, is "Brainrules" by John Medina. A rather good leadership seminar at my previous employer had this on its reading list, and I tore through it. John Medina is a molecular biologist and in his book he describes how our brain works by breaking it down into several areas, each describin... (more)

Stateless Transport Tunneling (STT) Meets the Network

Last week I walked through the packet formats for VXLAN and NVGRE specifically focused on ways by which the overlay packets provide information to the physical network that help the physical network. Some of the initial extreme thoughts that the overlay and physical network can and should be completely ignorant of each other have softened more recently and more pragmatic thoughts of collaborating layers are being articulated. At Plexxi we have often mentioned that we believe the physical network and the overlay need to be closely orchestrated to get the most benefit out of the to... (more)

Network Design in a Virtual World

We get quite caught up in high level architectures at times. It is good to read some posts that focus on design and implementation and the practicality of taking higher level architectures to reality. Two of Ivan’s posts caught my eye this week. In the first, he discusses the difference in how application and network folks look at the deployment of tiered applications and what that means for the security between them. In the second, he asks a question that our entire industry has under delivered on for more than a decade: why can’t we have plug-n-play networking? They may appear ... (more)

Multisite Fabrics: Distance Does Not Have to Be a Challenge

Not entirely unexpected, the optical capabilities in our switch have provoked questions from customers and potential customers on whether the Plexxi solution could be used to create campus, metro or even long distance multi site fabrics. The answer to that question is a resounding yes, and with the newly introduced switch 2 platform, some of the connectivity options added to that platform make it extremely flexible to do just that. The whole topic of Data Center Interconnects tends to attract strong supporters and strong opponents at the same time. In a world without constraints... (more)