[c-nsp] 3750 High Cpu IP Input

[Marian Ďurkovič]

On Fri, Apr 24, 2009 at 10:01:08AM -0400, Lee wrote:
> > These TTL=1 are causing the high CPU.

Yes, those are not HW switched but punted to CPU in order to generate 
TTL_Exceeded ICMP message. Not sure if there's any knob to discard
them silently.
 
> Just out of curiousity, would adding "ip multicast ttl-threshold 3"

Beware, this is real evil. On most switch platforms this will completely
disable HW forwarding of multicast packets and punt them *all* to CPU.

   M.