3750 Stack Images

Unanswered Question
Apr 8th, 2009

If I require an IPS Image for a 3750 stack, do i need to purchase all of the switches with IPS, or can I purchase the "base" with an IPS image and the rest with an IPB Image?

I know they all have to match for the stack to form correctly, but from a licensing feature do they all require that I purchase IPS? Technically it is only the one switch doing the advance routing that I need....

Thanks in advance.

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dario.didio Wed, 04/08/2009 - 05:30

Yes, they all need the same IOS feature set.

Otherwise your stack will not form due to an version mismatch error.



mhurley131 Wed, 04/08/2009 - 05:32

Understood....but does purchasing the IPS Image for the top switch give the customer the right to put that image on all of their switches in the same stack? Or do they have to spend the >$5k list price for each switch for the enhanced image.

dario.didio Wed, 04/08/2009 - 05:39

I'm not a Cisco employee nor an account manager, but I assume that if you want your stack to use the enhanced features of IPS, all switches in the stack should have IPS.

If you want all your switches to have IPS, you should buy the WS-C3750-XXXX-E instead of WS-C3750-XXXX-S.



Joseph W. Doherty Wed, 04/08/2009 - 07:14

My understanding is, legally you may not load a 3750 image onto a 3750 device unless you have a license for it. However, 3750s within a stack legally may run an image obtained from the stack master. (NB: there's different licensing rules for 3750-Es.)

Assuming I'm correct about legal licensing for 3750s, do keep in mind if the stack master fails, you would be unable to run the advanced feature image on the remaining stack units. (For redundancy, you might want to insure at least two units within a stack have licenses for the IOS you intend to run.)


Also keep in mind, that a "normal" IOS upgrade to a 3750 stack "flashes" all stack members, although I believe it's possible to "flash" stack members independently.

Leo Laohoo Wed, 04/08/2009 - 15:19

One of the logic that all members should have the same IOS version and feature set is this: Presume that the stack master has the IPS image and the rest doesn't. If your stack master fails how will the rest of the stack behave unless they all have the same IPS feature.

glen.grant Wed, 04/08/2009 - 16:02

They all need the same image to work and boot correctly but I am not sure of the licensing aspects of the 3750 , I would contact a cisco rep.


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