Saturday, November 19, 2016

Netiquette IQ Blog Of 11/19/16 - Leaf-Spine Networks








Leaf-Spine
Leaf-spine is a two-layer data center network topology that's useful for data centers that experience more east-west network traffic than north-south traffic. Basically, this topology augments the spine-layer with more switches to handle traffic within the data center. Servers and storage connect to leaf switches and leaf switches connect to spine switches. Leaf switches mesh into the spine, forming the access layer that delivers network connection points for servers. Spine switches have high port density and form the core of the architecture.
Every leaf switch in a leaf-spine architecture connects to every switch in the network fabric. No matter which leaf switch a server is connected to, it has to cross the same number of devices every time it connects to another server. (The only exception is when the other server is on the same leaf.) This minimizes latency and bottlenecks because each payload only has to travel to a spine switch and another leaf switch to reach its endpoint. 


 A leaf-spine topology can be layer 2 or layer 3 depending upon whether the links between the leaf and spine layer will be switched or routed. In a layer 2 leaf-spine design, Transparent Interconnection of Lots of Links (TRILL) or shortest path bridging takes the place of spanning-tree. All hosts are linked to the fabric and offer a loop-free route to their Ethernet MAC address through a shortest-path-first computation. In a layer 3 design, each link is routed. This approach is most efficient when virtual local area networks are sequestered to individual leaf switches or when a network overlay, like VXLAN, is working. 

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In addition to this blog, Netiquette IQ has a website with great assets which are being added to on a regular basis. I have authored the premiere book on Netiquette, “Netiquette IQ - A Comprehensive Guide to Improve, Enhance and Add Power to Your Email". My new book, “You’re Hired! Super Charge Your Email Skills in 60 Minutes. . . And Get That Job!” has just been published and will be followed by a trilogy of books on Netiquette for young people. You can view my profile, reviews of the book and content excerpts at:

 www.amazon.com/author/paulbabicki

Anyone who would like to review the book and have it posted on my blog or website, please contact me paul@netiquetteiq.com.

In addition to this blog, I maintain a radio show on BlogtalkRadio  and an online newsletter via paper.li.I have established Netiquette discussion groups with Linkedin and  Yahoo I am also a member of the International Business Etiquette and Protocol Group and Minding Manners among others. I regularly consult for the Gerson Lehrman Group, a worldwide network of subject matter experts and I have been contributing to the blogs Everything Email and emailmonday . My work has appeared in numerous publications and I have presented to groups such as The Breakfast Club of NJ and  PSG of Mercer County, NJ.


Additionally, I am the president of Tabula Rosa Systems, a “best of breed” reseller of products for communications, email, network management software, security products and professional services.  Also, I am the president of Netiquette IQ. We are currently developing an email IQ rating system, Netiquette IQ, which promotes the fundamentals outlined in my book.

Over the past twenty-five years, I have enjoyed a dynamic and successful career and have attained an extensive background in IT and electronic communications by selling and marketing within the information technology marketplace.
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