[c-nsp] OIR on 7600s: Pretty much evil?

[John Neiberger]

On Wed, Nov 10, 2010 at 5:28 PM, Benjamin Lovell <belovell at cisco.com> wrote:
> It's true. Bad things can happen. Primary one is buss stall. They are not
> supposed to happen anymore but there are bugIDs out there that prove they
> do. During buss stall we can't do forwarding lookups to PFC(pretty sure DFC
> lookups still work). Even worse is that during buss stall interrupts are
> disabled so packets can't be punted to the control plane and BFD packets
> which are generated in interrupt context can't be sent.
>
> Usually these things happen for a short enough period of time that the
> effects are minor or completely unnoticed unless you are running some things
> with tight timers like BFD tuned down, OSPF fast hellos, etc
>
> -Ben

I know for a fact that buss stalls happen because we saw it happen
last night!  ;)