From: Rich Collins (nilsi2002@gmail.com)
Date: Wed May 28 2008 - 15:43:55 ART
Hi Leo,
I agree with your answer and you explained it nicely.
-Rich
On 5/28/08, Leo Leung <leo0430453@gmail.com> wrote:
>
> this is a typical scenario where cir=mincir (by default mincir = 1/2
> cir). AR 256k may be cir only when there's no congestion, but the
> question clearly points "Make sure your throughput changes accordingly
> based upon BECN's received". This means cir will become 64k when
> congestion occurs. and BE is needed to utilize maximal throughput:
>
> cir = 64000
> bc = TC*cir = 125ms * 64000 = 8000
> bc+be = TC*AR = 125ms * 256000 = 32000
> be = 32000 - 8000 = 24000
>
> map-class frame-relay SHAPE
> frame-relay cir 64000
> frame-relay mincir 64000
> frame-relay bc 8000
> frame-relay be 24000
> frame-relay adaptive-shaping becn
> !
> int s1/0
> frame-relay traffic-shaping
> frame-relay class SHAPE
>
> thanks,
> Leo
>
>
> On 5/27/08, akyccie <akyccie@gmail.com> wrote:
> > Question regd the frame relay shaping.
> > Maximum throughout given is 256kbps. During congestion your provider will
> mark
> > any traffic in excess of 64kbps as discard eligible. Make sure your
> through
> > put changes accordingly based upon BECN's received. Token bucket interval
> is
> > 125ms.
> >
> > Is it the right answer
> >
> > map-class frame-relay SHAPE
> > frame-relay cir 256000
> > frame-relay mincir 64000
> > frame-relay bc 32000 (Bc = Tc * cir --> 0.125 * 256000 )
> > frame-relay be 4000 (air - cir * Tc / 8 Bytes --> 256000 * 0.125 / 8)
> > frame-relay adaptive-shaping becn
> > !
> > int s1/0
> > frame-relay traffic-shaping
> > frame-relay class SHAPE
> >
> >
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