The Catalyst 3750-12S switch supports desktop and aggregator Switch Database Management (SDM) templates. All other Catalyst 3750 switches support only the desktop SDM templates.
All stack members use the SDM template configured on the stack master. If the stack master is using an aggregator template, only Catalyst 3750-12S switches can be stack members. All other switches attempting to join this switch stack enter SDM-mismatch mode. These switches can join the stack only when the stack master is running a desktop SDM template.
We recommend that your stack master use an aggregator template only if you plan to create a switch stack of Catalyst 3750-12S switches. If you plan to have a switch stack with different Catalyst 3750 switch models, configure the stack master to use one of the desktop templates.
It's no problem at all - the whole point of these switches is that you can mix and match to get whatever port types and density you need in a stack.
When you download the software there is only one image (well, 4 if you count EMI/SMI and crypto/non-crypto) for all the 3750 switches.
As long as all the switches are at the same version it will be fine. If it's not, the new switch probably won't boot up straight away - often they will auto-upgrade, if not you may have to manually tell it to do it.. you can just copy the software from your running switch with the 'archive copy-sw' command.
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Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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