There are a few good white papers that cover 2nd gen MDS products,
http://cco.cisco.com/en/US/customer/products/ps5990/products_white_paper0900aecd8044c7fd.shtml
http://cco.cisco.com/en/US/customer/products/ps5990/products_white_paper0900aecd8044c7f3.shtml
http://cco.cisco.com/en/US/customer/products/ps5990/products_white_paper0900aecd8044c7e3.shtml
On Sup2:
- required for 9513, optional in 9509 & 9506
- GigE mgmt interface
- Enhance QoS
- ASIC consolidation -> fewer ASICs & more function.
- Must use different images than Sup 1
- more port indexes. A Sup-2 in 9509 can support more ports than a Sup-1, e.g. can now go to 336 ports with 7 x 48 port linecards.
- uses rear xbar modules when in 9513
- redundant bootflash on board
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