From: Dan C (cdan2154@gmail.com)
Date: Mon Jul 21 2008 - 09:30:41 ART
Hi Peter,
It all depends on your line speed, if your line speed is 1536 you will not
be able to exceed that speed via software configs....
If you are using a High speed serial intface just use the fr formulas as for
a TC value of 13 ms it is easy Bc= CIR x 13 /1000
or Be= (AR - CIR) x 13 /1000
Cheers,
Dan
On Mon, Jul 21, 2008 at 5:30 AM, Peter Stephan <engpeter@gmail.com> wrote:
> GS,
>
> Does anyone know how we should do the calculation for CIR, Bc and Tc above
> 1536Kbps?
> We have seen it in an earlier post where we had 13ms but noone knew where
> it
> came from!
>
> I've noted that "bc=cir*tc" for shaping up to 1536, above that value, the
> formula becomes invalid, and I see the Tc=1/2 the calculated value.
> Also the byte-limit is reduced.
>
> !
> map-class frame-relay FR
> frame-relay cir 2048000
> frame-relay bc 102400
> !
> map-class frame-relay FR1536
> frame-relay cir 1536000
> frame-relay bc 76800
> !
> R1#sho traffic-shape
>
> Interface Se0/0
> Access Target Byte Sustain Excess Interval Increment Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 103 2048000 6400 102400 0 25 6400 -
> 104 1536000 9600 76800 0 50 9600 -
> 105 1536000 9600 76800 0 50 9600 -
> 106 2048000 6400 102400 0 25 6400 -
> 102 1536000 9600 76800 0 50 9600 -
> !
>
> Thanks,
>
>
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