From: Kay D (krsna83@gmail.com)
Date: Tue Jun 20 2006 - 14:19:59 ART
Hi Petr ,
Thanks .I just mistook the round trip time (rtt) for Tc then
,as in the link
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_q_and_a_item09186a00800cdfab.shtml
So if i get a question asking to calculate Bc for use in Police command ,i
just do CIR* 1/8(provided Tc value is not given) ?
TIA
Kay
On 6/20/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> No :)
>
> This has been discussed numerous times :) 1.5 seconds is recommended
> value to calculate burst size suitable for TCP traffic. In this way it
> won't
> throttle down too much because of too many excessive drops.
>
> But there is no default or best value for burst with CAR. There are some
> defaults with MQC, though. AFAIR it's 1/4 sec for policer, and 1/5 sec for
> "priority" (I'm not sure with that!) :) With MQC you may just omit burst
> sizes.
>
> There are also some "non-tunable" policers in IOS, like "ip multicast
> rate-limit"
> and "ip rtp priority". They have burst size for 1 second of traffic rate.
>
> HTH
>
>
> --
> Petr Lapukhov, CCIE #16379
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
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