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Monthly Archives: September 2012

Large Layer 2 Domains and Vmotion

Vmware V-motion requires physical hosts to be in the same layer two domain. This goes against the grain in networks that were built around the principle of reducing the size and reach of broadcast domains.Layer 2 broadcast domains reduces the bandwidth available to our applications due to effect of frame flooding and also because Spanning tree’s operation disables redundant paths in our layer 2 networks.

Vmotion’s layer 2 requirement may be one of major reason why Flat layer 2 networks are being optimized.These optimization’s mitigate against the effects of broadcasts and unknown Unicast flooding which wastes network bandwidth.TRILL which is not really necessary to support Vmotion, has been developed to replace spanning tree in bandwidth intensive use cases that need all links to be forwarding at once. The existence of applications that require huge Flat networks will ensure the continued evolution of the layer 2 switching space and thus augment the simple plug N play nature of Ethernet networks that most people appreciate.

 

 

 

 

 

 

 

 
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Posted by on September 20, 2012 in Technology

 

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Looking at Dell Force 10

Dell has hit a home run with their force10 line. Born in the world of high frequency trading, Force10 with its huge output buffer provides Dow Jones, twitter and Facebook with low latency switching infrastructures. At prices lower than the nexus line and providing a command line that is syntactically similar to Cisco’s IOS. Force10 represent bridge to a hybrid network where Cisco IOS and force10 FTOS in concert with open standards such as lldp and gvrp gives the enterprise the ability to ensure that we receive the best features at the lowest pricepoints.

 
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Posted by on September 14, 2012 in Technology

 

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