[c-nsp] Sup720 Config registry

[Chris Riling]

I have seen an interesting one as well... I had a 7606 with a sup32 out of
sync once, and any input from the console port (or sometimes just on it's
own) it would halt the  switch processor and force a reboot... I'd suggest
you make sure the SP and RP are always in sync :)

Chris

On Sun, Aug 31, 2008 at 10:44 AM, Richard A Steenbergen <ras at e-gerbil.net>wrote:

> On Sun, Aug 31, 2008 at 03:28:18PM +0200, Mikael Abrahamsson wrote:
> > On Sun, 31 Aug 2008, Brett Clausenhauf wrote:
> >
> > >Can anybody who might know advise? It would be very much appreciated..
> >
> > I had a similar issue back in SXE days (2+ years ago) where the conf-reg
> > would get out of sync between modules on the Sup720-3bxl (it would show
> > conf-reg 0x2102 in IOS, but rebooting would go into rommon).
> >
> > To fix it, I would simply do a conf-reg 0x2102 and "wr" in regular config
> > mode, which seemed to set this conf-reg on all modules, making the
> problem
> > go away.
>
> I've seen a couple really cool side-effects from an out-of-sync config
> register between RP and SP... For example, I was once rebooting a sup720
> to change the cef maximum-routes tcam partitioning, and as soon as it
> would boot back up it would install a "reboot in 10 minutes" rule,
> like what Jared mentioned here:
>
> http://puck.nether.net/pipermail/cisco-nsp/2006-October/035266.html
>
> After sitting through a lot of automatic reboots and trying everything
> known to man to stop them, I finally found the problem was a desynced
> config-register that you couldn't see from IOS at all (you had to start
> a shell on the SP to see it), which caused the SP to not process the
> RP's new tcam partition config. Apparently there was some edge condition
> which might need you to reboot twice to fully update the SP, so Cisco
> just wrote code to automatically reboot if the SP wasn't updated
> correctly. Combine that with an out-of-sync config-register and you've
> got lots of endless rebooting fun. :)
>
> --
> Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
> GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
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