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The Virtual Switch – An SDN War Zone

12/7/2012

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What’s the foundation of the next generation data center network, i.e. this thing some call the software defined virtual data center network?  Many companies have recently re-branded their products and jumped on the Software Defined Networking (SDN) bandwagon in some way, shape, or form, and for good reason.  It has the potential to truly change networking as we know it today.  IDC has even stated SDN could be a $2B market by 2016. 

Let’s forget about all of this recent SDN washing and go back to virtual networking basics.  Most of us by now know what a software switch is.  It is also known as a vswitch or virtual switch.  This is arguably the most critical piece of real estate in the next generation data center network.  So, who owns this property?


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Nexus FEX "SMART" Multicast Replication

12/11/2011

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The Nexus 2000 as we all know gets its intelligence from its parent switch, i.e. Nexus 7000 or 5000.  The Nexus 2000 for the most part is just a dumb device, otherwise known as a Fabric Extender (FEX).  It may be a surprise for some, but even communication between two ports on the same fabric extender goes like this: FEX Source Port – Parent Switch – FEX Destination port.  The same holds true for the Cisco UCS Fabric Interconnect (6100 and 6200 series) and the local FEX that resides in a UCS Blade Enclosure. 

After having a recent conversation with Cisco and a financial customer around how L2 multicast works between a UCS 6120 and a FEX, it actually uncovered something interesting with regards to how this multicast flows.


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    Jason Edelman, Founder of Network to Code, focused on training and services for emerging network technologies. CCIE 15394.  VCDX-NV 167.


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