Stackwise limitation

[ajay kondapalli]

Hi,

What is the maximum number of switches can be stacked in stackwise technology. Is it 4 or 8 ?

Thanks,

Ajay

[Sandeep Choudhary]

HI Ajay,

Depends on what you need to do. You could connect 16 or more switches and have a total of 256 or more ports. But if your WAN connection to the first switch is to a 1Mbps DSL modem you are going to have quality of service issues.

The more you daisy chain switches...the worse the performance can be. Technically it can work to daisy chain more switches than you'll have available IPs...but it's an arguement of what sort of performance you're expecting, or even capable of determining.

just an example of stacking.

http://www.excitingip.com/1297/stacking-network-switches-lan/

Regards

Please rate if it helps.

[Leo Laohoo]

What is the maximum number of switches can be stacked in stackwise technology.

Stackwise comes in two "flavours".

The 2960S can be stacked UP TO four 2960S together to form a single logical unit.  The 2960S backplane has a 10 Gbps (full duplex) speed and uses a different stacking cable not compatible to the 3750/G/E/X.

The 3750/G/E/X can be stacked up to 9 units together to form a single logical unit.   3750/G has a stacking backplane speed of 8 Gbps (full duplex) vs 64 Gbps (full duplex) of the 3750E/X.  You can mix both any models of the 3750/G/E/X together because they are using the same stacking cable (that is not compatible to the 2960S) but by doing so it will bring the stacking backplane speed down to the lowest common denominator, 16 Gbps (full duplex).

Although it's been noted that you can stack up to nine (9) 3750/G/E/X together to form a single stack unit, it's not recommendable to have seven (7) or more units in a stack. 

[Joseph W. Doherty]

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leolaohoo wrote:
3750/G has a stacking backplane speed of 8 Gbps (full duplex) vs 64 Gbps (full duplex) of the 3750E/X.

Just to clarify Leo's information, the non-E/X have dual 8 Gbps (duplex) stack cables and the E/X have dual 16 Gbps (duplex) stack cables.  The E/X, besides doubling the bandwidth, uses its bandwidth much "smarter".  As Leo also notes, you can mix any series 3750 in the same stack, but any non-E/X will run the stack in non-E/X mode.

[Leo Laohoo]

Thanks for the pickup Joseph.