Cisco StackWise stacking creates a 32-Gbps switch interconnection. Stacking does not require user ports. Up to 9 units can be stacked together for a maximum of 468 10/100 ports, 468 10/100/1000 ports, 108 optical aggregation ports, nine 10 Gigabit Ethernet ports, or any mix thereof.
As the other posters have indicated, you can stack up to 9 units. You can also intermix the original 3270 and 3270-E series in the same stack.
As also noted by Dario, the stack ring provides "32 Gbps", but my understanding it's dual 8 Gbps, duplex. Also, it's unclear whether both are used independently or all data is duplicated across both paths. (I suspect the latter.)
Cisco has documented major improvements in the 3750-E's StackWise+ (NB: BTW improvements lost if used mixed series stack), which show the original StackWise, I think, weak for heavy traffic load.
It helps, I think, to consider a large stack of 3750s where you might deploy a 6509/6513 with dual sup32s.
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