It would need to be more granular than that.
IP options and a number of other things get software switched and a number of 
them already have specific knobs.
Better would be 'ip cef overflow software-switching 
[off|longest-prefixes|shortest-prefixes|last-learned]'.
Hopefully the new cef compression code will free up quite a bit of fib space 
and basically solve the problem.

LR Mack McBride
Network Architect

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Lukasz Bromirski
Sent: Sunday, February 05, 2012 6:41 AM
To: [email protected]
Subject: Re: [c-nsp] ASR100x route tables sanity check

On 2012-02-05 14:03, [email protected] wrote:

> It would be nice to have a knob to turn software forwarding off 
> completely. Makes it easier to find forwarding problems because they 
> tend to be visible right away when traffic stops...

If you apply CoPP policy that's strong enough, you'll see the problems right 
away if the packet switches through the RP. And the punt counters are pretty 
comprehensive, not to mention debug options that can describe the situation 
pretty verbosely.

But yes, 'no ip cef software-switching' or 'no platform software switching' 
would be potentially handy for binary approach to forwarding.

-- 
"There's no sense in being precise when |               Łukasz Bromirski
  you don't know what you're talking     |      jid:[email protected]
  about."               John von Neumann |    http://lukasz.bromirski.net
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