[c-nsp] Quick rate-limit question..

[Rodney Dunn]

MQC with policing is the way to go.  I never suggest
CAR when I can accomplish the same thing with MQC/policing.

Also, if you are using named ACL's please run code later
than:

12.3(07.04)T 12.2(23.01)S01 012.003(007.004) 012.002(022.003)

as we improved the lookup times for named ACL's.

Rodney
 

On Thu, Aug 26, 2004 at 10:28:27AM +0300, Rafi Sadowsky wrote:
> 
> ## On 2004-08-26 02:41 -0400 James typed:
> 
> J> Hi folks,
> J> 
> J> I've been hearing that when CAR is applied on an interface (the rate-limit
> J> command under interface instead of MQC command), the router searches for
> J> rate-limit settings in a linear lookup, where large number of interfaces can
> J> slow down the throughput.. Is this true?
> J> 
> J> I have a situation w/ an edge router that has about 100 dot1q vlan interfaces 
> J> on it and a few needs have been brought up to our attention that require
> J> CAR on some of the interfaces.. Being a bit conservative, I'm just wondering
> J> of the implications in the 'linear-search' effect I've been hearing about.
> J> If that is true however, would using MQC policer be a right alternative?
> 
>  MQC seem to be the Cisco recommendation
> 
> Quote from:
> <http://www.cisco.com/en/US/customer/tech/tk543/tk545/technologies_tech_note09186a00800d7276.shtml#topic2>
> 
>  Cisco recommends using the modular QoS CLI features when possible to
> implement quality of service in your network. Use class-based policing
> through the police command in a service policy to implement rate limiting
> without buffering or queuing.
>  >>>> Avoid using CAR, <<< 
> for which no new features or functionality is planned.
>  Cisco will continue to support CAR for existing implementations using
> this method.
> 
> 
> 
> -- 
> HTH,
> 	Rafi
> 
> J> 
> J> Thanks!
> J> -J
> J> 
> J> 
> 
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