[c-nsp] Sup720, multicast bothers the CPU

[Phil Mayers]

On 23/03/11 11:13, Mikael Abrahamsson wrote:
> On Wed, 23 Mar 2011, Asbjorn Hojmark - Lists wrote:
>
>> Look at MLS rate limiters, where you can control how much is punted.
>
> The keyword to look for is "CoPP" (Control Plane Policing).
>

MLS rate limiters and CoPP are completely different, and, AIUI, CoPP is 
not performed in hardware for multicast:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/copp.html#wp1141802

•CoPP is supported in software for the following:
  –Multicast traffic.
  –Broadcast traffic.

If the OP is finding their CPU pegged by multicast, CoPP in software is 
unlikely to solve the problem. It might reduce the CPU usage, but is 
unlikely to eliminate it.