From: mani poopal (mani_ccie@yahoo.com)
Date: Fri Dec 24 2004 - 11:42:09 GMT-3
Hi Tim,
Thanks for getting back to me. Look at the example form cisco press lab practise guide(lab5 QOS), In the example average is given as 20mbps.
I would calculate bc as follows:
20 mbps=20,000,000bps
20000000*(1/8)=2500000bits (tc is assumed as defualt 1/8sec or 125ms)
2500000/8=312500bytes(bits to byte conversion)
EXAMPLE GIVEN IN THE DEBRIEF SECTION::
rate-limit output access-group 101 20000000 24000 32000 conform-action
set-prec-transmit 5 exceed-action set-prec-transmit 0
So if it is either MQC police command or rate-limit command I would use 312500 for both bc and be. But the example uses:24000 and 32000 bytes. I am not sure how the author came up with 24000 byts and 32000 bytes for normal and extended burst values. I think we have to get it right because even in the exam we have to type right numbers.
Mani
ccie2be <ccie2be@nyc.rr.com> wrote:
Mani,
Off-hand, I don't know the answer to your question but here are a couple
thoughts:
1) Given that's there's nothing that can be done using the rate-limit
command that can NOT be done
using the police MQC, and Cisco's direction is to do all QoS with MQC, I
would doubt that you would
ever need to use the rate-limit command in the lab.
2) Does the command (either rate-limit or police) require that a value for
Bc is entered? I'm not sure, but I think
it's possible that you don't need to enter a Bc value and therefore, you can
let IOS compute that value.
3) If the Bc must be entered, just use the same value but converted to
bytes.
HTH, Tim
----- Original Message -----
From: "mani poopal"
To:
Sent: Friday, December 24, 2004 8:07 AM
Subject: QOS- CAR rate-limit statement's normal/extended burst
> Hi Guys,
>
> In the rate limit statement or question if only rate is given(assue
20mbps), how do we arrive at values for extended and normal burst sizes. I
know this has been discussed earlier but any help is appreciated.
> eg:
> rate-limit output access-group 101 20000000 24000 32000 conform-action
set-prec-
> transmit 5 exceed-action set-prec-transmit 0
>
> ps:
> 20000000- in bits per second
> 24000----bytes
> 32000----bytes
> How do they arrive at 24000 and 32000 values.
>
> thanks
>
> Mani
>
>
>
> B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
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