[c-nsp] Mixing 2960S and X in stack

[Gert Doering]

Hi,

On Sun, May 31, 2015 at 07:41:14PM +0200, Garry wrote:
> A customer of ours needed to extend a rack's switch ports, which at that
> point consisted of a stack of two 2960S-LPD-L switches. The new switch
> he set up was a 2960X-LPD-L. Anyway, contrary to what I would have
> expected, neither of the stacking ports on the S and X switches came up.

Haaaahaha... welcome to hell.

You need to set 

(config)#switch stack port-speed ?
  10  Change stack speed to 10G

on the X switch, and then reboot.

(We found this the hard way, being on-site, trying to enable stacking on
a fully productive X switch, after just having moved everything off 
the S switch *towards* the X switch, so we could reload the S switch to 
make it join...  which it "just did not", with no message why...)

To add to the fun, you need to have "identical IOS versions" on both
switches - c2960x-universalk9-mz.152-2.E1.bin and 
c2960s-universalk9-mz.152-2a.E1.bin was the only combination we could
find that actually works, *and* you need to put the X switch into
the "sdm prefer default" template, which actually isn't *default*...


In retrospective: had I known this before, I whould have bought an extra
2960S switch instead...  and I'm afraid to ever touch these two switches 
again (like, upgrade software, or reboot, or anything...)

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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