From: Vince Mashburn (cciegroupstudy@gmail.com)
Date: Fri May 25 2007 - 15:39:02 ART
I dont think that is correct. Shape peak does send bc + be every tc, but
the values it takes upon configuration are shape peak <CIR> <bc> <be>.
so, if you were given a 300k link, and they told you that you could burst up
to 512k, if available, and using a tc of 10 ms, you would do the following:
shape peak 300000 3000 2120
300000 = CIR
3000 = CIR * tc
2120 = (512 - 300) * tc
The only difference between shape average and shape peak is in how the
excess bandwidth is used. In shape peak, bc + be are transmitted EVERY
interval, and with shape average, be is only transmitted if the complete bc
from the previous interval was not used. So basically, you can look at the
values above as MAXIMUM values. That is, it doesn't necessarily mean that
you will burst to the full 512k. Hope this helps.
On 5/25/07, sirisak@itmanagement.co.th <sirisak@itmanagement.co.th> wrote:
>
> Dear all.
> Since I see the example in the Doc CD about "shape peak" command.
> Refer to this link.
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hqos_r/qos_s1h.htm#wp1085303
>
> The router uses formula -> peak rate = CIR(1 + Be / Bc)
> The following example uses peak rate shaping to ensure a bandwidth of 300
> kbps but allow throughput up to 512 kbps if enough bandwidth is available
> on the interface:
>
> bandwidth 300
> shape peak 512000
>
> so is this meant that "shape peak <value>", value = peak rate?, not CIR?
>
> Best regards.
> Sirisak
>
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