From: loc.pham@comcast.net
Date: Fri Dec 24 2004 - 13:21:09 GMT-3
Mani, IMO, the author using the 128k line as a ref. bandwidth, and that is why.
GS have lot of disc. of howto, here is one link:
http://www.groupstudy.com/archives/ccielab/200303/msg01827.html
HTH,
Have a happy holiday,
LP
> 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
> > (416)431 9929
> > MANI_CCIE@YAHOO.COM
> >
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>
>
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