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Ushering in the Software Defined Cloud Networking Era

Jayshree Ullal
by Jayshree Ullal on May 1, 2012 5:42:55 PM

Since I last blogged about Software Defined Networking last year industry discussion on this topic has risen to the highest levels of exuberance. Leading industry analyst Nick Lippis views this as the third epoch of networking with applications finally being freed from physical addresses, networks and ports.

Epoch Years Networking Computing
First 1955-1980 Circuits,TDM,BSC,SNA Mainframes
Second 1980-2005's LANs,TCP/IP PC,client-server
Third 2005+ SDN Mobile,virtual,cloud

Last month’s simultaneous OpenStack and Open (Networking) Summit conferences and Cisco’s much publicized spin-in simply validate Arista’s pioneering innovations in Software Defined Cloud Networking (SDCN) with 1400+ customers already deployed and more coming daily.

Arista EOS: Designed for SDCN

Arista’s Extensible Operating System (EOS) is the foundation needed for using open controller APIs to communicate between the network and the SDN controller to implement cloud-scale Layer 2/3 networking. The virtual and physical network must co-exist and are not mutually exclusive. Arista platforms have the ability to apply a variety of forwarding actions enabling flow-granular control over network traffic at full line rate on all ports simultaneously. Arista's new platforms have support for tunnel encapsulation, with advanced schemes that scale beyond the MAC table limitations of individual devices. Arista's EOS software can host the client portion of any controller-based system, communicating with the central controller and programming the switch's forwarding plane accordingly through the EOS System Database (Sysdb). With support for flow monitoring, auto-initialization of zero-touch deployment of large numbers of switches (ZTP/ZTR), early notification of application caused network congestion (LANZ) and advanced event triggers (AEM), Arista switches running EOS are an ideal choice for SDN controlled cloud networks.

Open, Standards Based Approach:

The third generation of networking has indeed arrived, driven by network virtualization and cloud computing and leading to a perfect network storm requiring cloud-scale software platforms. Particularly for high performance applications such as Hadoop, network virtualization across L3 boundaries, and access to storage and compute within Web 2.0 clusters, scale, control, and performance must be handled in tandem.

However that does not mean re-inventing IP networks. SDN success depends on coexistence with today’s internetworking protocols with tomorrow’s controllers. Success cannot result from legacy network operating systems because SDN success requires a more cohesive approach. It calls for building better network switches utilizing a modern multi-process state sharing software architecture like Arista EOS is an integral part of a new cloud stack where physical and virtual networks converge rather than operate in isolation. Arista EOS is the result of over 100,000 man-years of development by the industry’s finest engineers working at the cutting edge of software research and development. No easy feat and a massive development investment.

Partners Enable Controllers for Arista SDCN:

Standards based platforms coupled with a modern switch operating system are hallmarks of Arista. Arista EOS is both mandatory for SDCN and yet difficult to implement without Arista’s singular focus on building the best switches for Advanced Software Defined Cloud Networking. At Interop 2012, come visit Arista at booth #1539 to see how SDN controllers can be enabled for real world environments, be it for applications with OpenFlow (Big Switch Networks) or API’s for OpenStack (with Nebula) or for the most widely deployed and successful controller in the market place today from VMware for data center-wide virtualization.

No overlays. No proprietary fabrics. No vendor lock-ins. An exciting tipping point for the industry in evolutionary standards-based networking! Welcome to the new world of Software Defined Cloud Networking from Arista and our partners! As always, I welcome your views at

Opinions expressed here are the personal opinions of the original authors, not of Arista Networks. The content is provided for informational purposes only and is not meant to be an endorsement or representation by Arista Networks or any other party.
Jayshree Ullal
Written by Jayshree Ullal
As President and CEO of Arista for over a decade, Jayshree Ullal is responsible for Arista’s business and thought leadership in cloud networking. She led the company to a historic and successful IPO in June 2014 from zero to a multibillion-dollar business. Formerly Jayshree was Senior Vice President at Cisco, responsible for a $10B business in datacenter, switching and services. With more than 30 years of networking experience, she is the recipient of numerous awards including E&Y’s “Entrepreneur of the Year” in 2015, Barron’s “World’s Best CEOs” in 2018 and one of Fortune’s “Top 20 Business persons” in 2019. Jayshree holds a B.S. in Engineering (Electrical) and an M.S. degree in engineering management. She is a recipient of the SFSU and SCU Distinguished Alumni Awards in 2013 and 2016.

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