as far as I know, FEXs are supported on N9K. See: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/guide-c07-730115.html
Below "Figure 1".
Well, vpc peer-link doesn't really have to use all 12x 40G ports, does it? :-P
I come from design background and just wondering, why you buy a so expensive N9K only for 40G Ports....maybe you plan for ACI in the future? For 40G Fabric, N6K would do.....maybe not enough ports? ...no attention to ask too many details. Sorry if I go too far away. :)
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