[c-nsp] More 6500 questions... Optimized ACL Logging

[Phil Mayers]

Ian MacKinnon wrote:
> Hi All,
> 
> More stupid questions to keep you busy.
> 
> Cisco Optimized ACL logging, what is it good for?

If you have an ACL ACE with a log action set, with lots of pps hitting 
it, the OAL buffer (to my understanding) absorbs duplicate hits in 
*hardware* before they are punted to the MSFC.

I have it working on our boxes (though mostly as a precaution - we don't 
have logging enabled on ACLs as a rule)

I have:

logging ip access-list cache rate-limit 300

...in the global config which you may need.

> 
> I have 6500s with Sup32, so PFC3B as required according to
> http://www.cisco.com/univercd/cc/td/doc/product/metro/me6500/122zu/sg/acl.htm#wp1035490
> 
> I have a simple access list
> ip access-list extended testlogging
>  permit ip any any
> 

Well, there's no "log" statement there. So OAL won't do anything...