Howto: Stack 3750g 12s with 3750g 48T?

Hello,

we bought a new core switch (3750G with 48 gig Ethernet Ports) and
wanted to stack it with our old fibre optic 3750g 12s switch.
First we ran into "unsupported Firmware" trouble, after a copy from
old to new, they have same FW.
But now the Master switch tells somthing about "SDM missmatch".
After reading a lot of Cisco documentation i am not sure, what to
do...

On the old 3750g 12s the default aggregation template is activated. Do
i have to change this to desktop template?

And if yes, why?

Thank you in advance

cheers
Johannes

 

In general this is what you need to do....

Unstack both switches and reboot them.
Make sure both switches are booting the SAME IOS binary file. If they are
different versions it won't work.
Save a copy of the both switches configurations on your PC (if you need to
keep the configuration)
Do a write erase on both switches.
Power them both off.
Stack them
Power them both on (if you have a preference for which one you want as
Master, power that one on first wait a few minutes and then power on the
other one.)

Paste the configuration of one of switches and ONLY the interface
configurations from the other. You may have to do a bit of editing of the
interface names because they might change (The master will be 1/0/x and the
other will be 2/0/x where before it was also 1/0/x).

 

Hm,

as far as I read the articles on Ciscos website, it seems, that the
3750 12s has a bit more Memory, and default is the SDM agreggation
template,
which is not supported by the 3750 48T.

http://www.cisco.com/en/US/docs/swi...se/12.1_19_ea1/configuration/guide/swsdm.html

So I only see 2 solutions
1. We set the 3750 48T as Stack Master and he tells the other 3750 12s
to switch to routing desktop template and reboot all other switches
2. We set the routing desktop template manualy on the actual Stack
master 3750 and reboot all other switches

Is that right?

Johannes

 

Hello Peter,

Thank you for your help.

Today at 5am we scheduled a downtime for 15 minutes, and i linked the
switches with Stack cables.
Than i configured the master 3750 12s (with 8gbic modules) for usind
"default desktop template" (#sdm prefer default desktop).
After a reload, he submited this to the member switches and everything
was fine, no more errors or missmatches.

The problem is an incompatibility of the memory usage templates,
because the "out of the box" settings of a 3750 12s is "aggregation
template",
this kind of setting is not available on 3750 48t.
Now, after switching to "default desktop template" the sdm matches on
all switches.

Regards
Johannes

 

hi johannes,

i'm currently having the same problem.
as cisco's papers describe only WS-C3750-12S have got the ability to set sdm
to an aggregate template.

Even doe Cisco says in their product specs that within a Series there are no
hardware differencialitys, for some reason the WS-C3750-12-S is kind of
special.

The 12-S is the only one capable of aggregate template. in order to stack
a -12-S with other 3750 types, as you have done so, one needs to downgrade
to an desktop sdm.
I haven't seen it possible on any other WS-C35XX or WS-C37XX platform so
far.

As i've read, the new WS-X3750 haven't got an aggregeat template...

if some one of Cisco would be as kind in order to tell us what kind of
alternatives there are in order to address this problem, i realy would
appreatiate this.

colin