3750G and 3750X together in stack

[MitchellMorris]

Hi,

I have 2 Catalyst 3750G 48PoE switch connected together using stack cable and need to add another switch.  I can't get 3750G switches anymore so have had to get a 3750X which I was told would be compatible.  However I'm struggling to find a firmware that will work on both switches.

The existing 3750G uses the IPBase feature set and the c3750-ipbasek9-tar.122-50-SE3.tar IOS image.  This image won't go on the new switch, when I try and install the image I receive an error saying it doesn't support this system type.  So, I've tried installing the c3750e-ipbasek9-tar.150-2.SE7.tar on the 3750X switch which it accepts, however I now connect the switch in the stack and receive a Version Mismatch in the stack which I was expecting.  But then when I try and put that firmware on the old 3750G switch I again receive the error it doesn't support that system type.

Anyone know which IPBase firmware will actually work with both switch types in the same stack?

Thanks.

[paul driver]

Hello

Have/Can you upgrade the stack to 15.0.2SE7 ios and feature set

res

Paul

[MitchellMorris]

Hi Paul,

15.0.2SE7 goes on the 3750X fine - I uploaded the config and ensured it would be elected stack master - then when I add the 3750G switch to the stack it detects the mismatched versions and tries to update the firmware on the other switch but fails saying Switch 2 does not support that system type.

I've also tried running the following just on the 3750G not connected to the stack and get the same error:

archive download-sw /overwrite /allow-feature-upgrade tftp://10.0.0.2/c3750e-ipbasek9-tar.150-2.SE7.tar

[Seb Rupik · Accepted solution]

Looks like you are installing the 3750X code onto the 3750G. Use the following images::

3750X : c3750e-ipbasek9-tar.150-2.SE7.tar

3750G : c3750-ipbasek9-tar.150-2.SE7.tar

...note the 'e' in the 3750X image.

cheers,

Seb.

[MitchellMorris]

Heh - I really hope it's that simple :)

Thanks Seb - downloaded the image so will give it a go.