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Re: no frame-relay adaptive-shaping posted 12/02/2007
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Thanks Tarun and Carlus.

It is truw that "no frame-relay adaptive-shaping becn" is the default and
even when you configure it, it is not shown in the configuration.


On 12/2/07, Tarun Pahuja <pahujat@xxxxxxxxx> wrote:
>
> Mohammad,
>                   I would suggest that you read up on the concept. It
> is very important that you understand the concept as the question can
> be directed  from any direction.
>
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t4/ft_afrts.htm
>
> Few things to keep in mind are:
>
> is the VC running Voice over it, if yes, you really do not want
> adaptive shaping enabled.
>
> If the configured CIR within the frame relay map class is the same as
> the true CIR of the PVC, there is no need to throttle down traffic due
> to BECNs. If CIR is not exceeded, BECNs are not generated.
>
> when using Adapting shaping in the worst case scenario you are
> dropping the packets at the VC queue level rather than the interface
> level.
> HTH,
> Tarun
> On Dec 2, 2007 10:02 AM, Mohammad Tawfiq Dawod <www.engineer@xxxxxxxxx>
> wrote:
> > OK Carlos,
> >
> > But if the task did not metntion anything about BECN ..? I mean is not
> it "
> > no fram adpative-shaping"  the default?
> >
> >
> >
> > On 12/2/07, Carlos Trujillo Jimenez <nergal888@xxxxxxxxxxx> wrote:
> > >
> > > Depends, If the task IS ASKING OR NOT to do it..
> > > if you have adaptive shaping becn enabled, when the frame-relay
> network
> > > experiences congestion it sends back to the router becn packets in one
> > > side
> > > and fecn packets at the other side.
> > > So when the router recibes becn or fecn packets, and if it is
> configured
> > > to
> > > adapt for the congestion it reduces the configured cir value to the
> mincir
> > > value.
> > >
> > >
> > >
> > >
> > > >From: "Mohammad Tawfiq Dawod" <www.engineer@xxxxxxxxx>
> > > >Return-Path: ccielab-owner@xxxxxxxxxxxxxx
> > > >X-OriginalArrivalTime: 02 Dec 2007 14:49:24.0614 (UTC)
> > > >FILETIME=[87DC2260:01C834F2]
> > > >
> > > >When configuring frame-relay map-class like the below one; is it
> > > necessary
> > > >that I configure "no frame-relay adaptive-shaping".
> > > >
> > > >The below example is from cisco.com
> > > >*
> > > >
> > > >map-class frame-relay fr-voip
> > > >
> > > >frame-relay cir 800000
> > > >*
> > > >
> > > >frame-relay bc 8000
> > > >
> > > >frame-relay mincir 128000
> > > >*
> > > >
> > > >frame-relay fragment 280
> > > >*
> > > >
> > > >no frame-relay adaptive-shaping
> > > >*
> > > >
> > > >frame-relay fair-queue*
> > > >
> > > >
> > > >--
> > > >Best Regards,
> > > >Mohammad
> > > >
> > >
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> >
> > --
> >
> > Best Regards,
> > Mohammad
> >
> > _______________________________________________________________________
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> >
>



-- 
Best Regards,
Mohammad