3750 Stacking

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Jul 22nd, 2009
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We are thinking about utilizing the 3750's stacking option.

My question is, what is the maximum number of switches you can have in the stack?


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dario.didio Wed, 07/22/2009 - 00:31
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you can stack up to 9 C3750s together:

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.

info: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/product_data_sheet0900aecd80371991.html



Joseph W. Doherty Wed, 07/22/2009 - 03:58
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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.

Leo Laohoo Wed, 07/22/2009 - 14:42
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In my experience, if you want to stack MORE THAN 7 2975/3750/3750-E, I agree with Joseph's recommendation and get a 6509.


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