Solved: Stackwise update question

David Flatley · ‎05-09-2013

We have a 3750 (master) and 3750G in a stackwise configuration. We want to add a new 3750X to the stack. We downloaded C3750-ipservices-k9-mz-122-55-SE7 to install. The plan was to update the present stack so that when the 3750X is added we don't get a "version mismatch" or hopefully the version on the 3750X is the same version. We are planning on retiring the 3750 because it is end of life in 2014 after the stack is fully up.

Immediate problem with this is the tar file for the version we want to install is over 16 megs and the 3750 has a 16 meg flash. So updating the 3750 would be an issue. I could just tftp the bin file but from what I read the auto update will then not work. So them maybe the course of action is to power off the 3750 so the master responsibilities goes to the 3750G, Update it with the tar file, then connect the 3750X and hope that the 3750G can synch with the 3750X.

Does this seem reasonable or is there a better course of action? We might want to retask the 3750 in the near future, but not with the stack.

NOTE: Yes we did buy IP-services when we bought the 3750X.

Leo Laohoo · ‎05-13-2013

 If I upgrade my C3750G with the full IOS version while the C3750 is in the stack, will the C3750G try to update the C3750 with it's IOS which is greater than 16 megs???

This doesn't make any sense.

12.2(55)SE7 is a "full" IOS.

To decide what version you should be looking for, you need to look at your least-common-denominator. In your case, the switch model with the lowest amount of flash memory.

So, let's say that you want to use 12.2(58)SE2. Your 3750G, with 32 mb flash, will accept the IOS but your remaining switch with only 16 mb flash will NOT accept the IOS.

After you reboot the stack, the entire stack will "split".

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