[c-nsp] 6500 SUP720 High Latency and Jitter issues

[Andrew Fort]

Jared Mauch wrote:

> 	You may also want to enable control plane policing on your s720
> in order to limit traffic directed to the MFSC.
> 
> 	keeping ICMP and other traffic down is something everyone should
> be looking at doing.
> 
> 	- jared
> 

76k related: we found that using

'mls rate-limit unicast cef receive <x> <y>'

was quite useful in stopping the traffic from even getting to the MSFC 
to be dealt with by any software 'protection'.  This is on "WS-SUP720", 
though, I don't know if this is still required on 3B/3BXL.  With 
reasonable values of <x>, the box was now able to sustain routing 
protocols despite being flooded with several Mpps (directed at its IP 
interfaces) via traffic generators.  Actually any value of x made a 
difference, IIRC, but setting it too low probably has negative consequences.

I'd be interested to hear if others use this command! (or if it has 
known deadliness if <x> is too low) :-)

-andrew