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FDR InfiniBand ... can you stack interconnects

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FDR InfiniBand ... can you stack interconnects

An InfiniBand question from Greg:




Customer would like to know if they can stack FDR (managed) interconnects between enclosures to provide higher aggregate speed to other enclosures.




Reply from Andrey:




You may connect multiply enclosures in single Infiniband fabric with oversubscription up to 1:1 (max bandwidth)


For 2 enclosures you may simply connect FDR switches from first enclosure to another.

For more than 2 enclosures you should use external FDR switches and build “FAT- Tree” network


Like this for 4 enclosures:




See more about IB  at


and about Fat-Tree at




Comments or questions?