Thanks Sean. I did a further research and found that Sup2 is now end of sale and also going to be end of support in feb, 2012. It was replaces by SUP 720. But according to cisco some version of sup 720 are also being replaced by sup720 xl and also by supervisor engine sup 2T.
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Basically, the sup720 is a sup2 with integrated SFM; there are some other minor improvements.
The sup2T biggest enhancement is the 2TB fabric vs. 720GB fabric, but it offers other improvements such as VSS support too.
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