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Pickup from Fulcrum

7000,7100 series uses Fulcrum crossbar ASICs. Here are some tech resource that had been published from Fulcrum Micro.

FocalPoint / Fulcrum documents

FocalPoint FM4000 series

Basic architecture and features of FM4224 crossbar chip.

FocalPoint Platform Reference Designs

10G switch reference design with FM4000 series chips.

FocalPoint in Large-Scale Clos Switches White Paper

http://www.fulcrummicro.com/documents/applications/clos.pdf
Figure 6. shows up a Fat Tree model (CLOS architecture) based 288ports design by using 24port switch chip.
http://www.fulcrummicro.com/product_library/applications/Scaling_The_Cloud.pdf
Here is similar info of above one.

Scaling the Cloud

http://www.fulcrummicro.com/cloudscaling.htm

A list of switches of various company using CLOS architecture.