From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Mon Oct 02 2006 - 02:09:46 ART
With fragments you need to ensure that serialization delay is at least
comparable
to codec's sampling rate and shaper's delay. Since you set shapers' delay
to minimal 10ms you may as well set serialization delay to 10ms.
Therefore, you usually set fragment size to [Inteface-Bit-Rate*10ms/8]
bytes.
With 256kbit its 320 bytes.
2006/10/2, Cagri Yucel <acybox-groupstudy@yahoo.com>:
>
> Hi Cadet,
>
> As far as I know, there is no specific formulation for
> fragmentation. If you are needed or asked to fragment packets by 250ms
> intervals, you use the below command. However this value hasn't been
> derived
> from some formula.
>
> Hope this makes sense.
>
> Cagri
>
>
> ----- Original Message
> ----
> From: cadet <cadet22@gmail.com>
> To: Cagri Yucel
> < acybox-groupstudy@yahoo.com>
> Cc: Cisco certification <ccielab@groupstudy.com>
> Sent: Sunday, October 1, 2006 10:26:26 PM
> Subject: Re[2]: Value Bc, Be,
> fragment, etc
>
>
> Cagri,
>
> I did not understand about fragment :(
> r1(config)#map-class frame-relay test
> r1(config-map-class)#frame-relay
> fragment ?
> <16-1600> Define fragment size, Bytes
>
>
>
>
> > Bc = cir * Tc /
> 1000
> > in your example Tc is taken as 10ms. Which is the minimum
> > value and
> good for voice traffic.
>
> > Be= (AR - Cir) * Tc / 1000, so AR = 316000
> >
> Fragment is not calculated by a formula, it is just 250ms for each
> fragment.
> >
> And no idea about RTP priority :)
>
> > Cagri
>
>
> > ----- Original Message ----
> >
> From:
> > "cadet22@gmail.com" < cadet22@gmail.com>
> > To: ccielab@groupstudy.com
> >
> Sent:
> > Sunday, October 1, 2006 8:59:47 PM
> > Subject: Value Bc, Be, fragment,
> etc
>
>
> > Hi
> > All !
> > I have question about value in the next sample from Cisco
> web site:
>
> > The
> > following example first configures the Frame Relay map
> class called voip and
> > then applies the map class to PVC 100 to provide
> strict priority service to
> > matching RTP packets. In this example, RTP
> packets on PVC 100 with UDP ports
> > in the range 16384 to 32764 will be
> matched and given strict priority service.
> > map-class frame-relay voip
>
> >
> frame-relay cir 256000
>
> > frame-relay bc 2560 ----
> > which formula ?
>
> >
> frame-relay be 600 ---- which formula ?
>
> > frame-relay
> > mincir 256000
>
> >
> no frame-relay adaptive-shaping
>
> > frame-relay fair-queue
> > frame-relay
> fragment 250 ---- which formula ?
>
> > frame-relay ip rtp priority
> > 16384
> 16380 210 ---- which formula ?
>
> > Thank you very much.
> > Max.
> >
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-- Petr Lapukhov, CCIE #16379 petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344
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