[c-nsp] CEF bug with 12.2(25)S4

[Saku Ytti]

On (2007-05-21 23:06 +0200), Vincent De Keyzer wrote:
> Saku,
> 
> thanks for your answer!
> 
> However the bug description found on CCO does not seem to cover completely
> what we have seen: e.g. applying "no ip route-cache" to int Gig2/0.801
> causes CEF to be disabled on all subinterfaces of Gi2/0.
> 
> Do you think that this is actually the same bug? I wouldn't like to upgrade
> software just to discover that only half of the problem is solved.

I think so, but by all means, confirm from TAC. Problem might actually be
triggered when CEF state information is being updated for given information
that has uRPF configured. Removing CEF and removing interface ending up
causing same state update.
However, if you're seeing this issue on interface that does not have uRPF,
then it's different issue.

> 
> Vincent
> 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Saku Ytti
> > Sent: lundi 21 mai 2007 11:16
> > To: cisco-nsp at puck.nether.net
> > Subject: Re: [c-nsp] CEF bug with 12.2(25)S4
> > 
> > On (2007-05-21 10:03 +0200), Vincent De Keyzer wrote:
> > 
> > > we are hitting more frequently than we would like a bug on our 7206VXRs
> > > running 12.2(25)S4: when we disable CEF on a 802.1q subinterface, or
> > delete
> > > that subinterface, CEF gets disabled globally on all subinterfaces of
> > that
> > > physical interface (on our luckiest days, all other ports are affected,
> > > too).
> > 
> > You're hitting CSCeg51513, which is triggered by deleting interface that
> > has uRPF configured at time of deletion. Workaround is to do 'default int
> > X'
> > before deleting it, to remove all cruft, including uRPF.
> > I'd advice going to 12.2(28)SB7.
> > 
> > --
> >   ++ytti
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> 

-- 
  ++ytti