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

[Benjamin Lovell]

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


On Nov 10, 2010, at 5:06 PM, Seth Mattinen wrote:

> On 11/10/2010 14:01, John Neiberger wrote:
>> I'm just curious to hear your thoughts on OIR on this platform. Is
>> this something that you prefer to avoid? Do you have any OIR-related
>> horror stories you'd like to share?
>
> Also known as "online insert and reboot". Anything can happen and
> frequently does, so it's best to assume there will be downtime and  
> plan
> a maintenance window.
>
> ~Seth
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