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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Hi all<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Is there any reliable
oversubscription calculators, algorithms or even simple rules of thumbs.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>TIA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Sam<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Andy Schutz (aschutz) [mailto:<st1:PersonName w:st="on">aschutz@cisco.com</st1:PersonName>]
<br>
<b><span style='font-weight:bold'>Sent:</span></b> 18 January 2005 01:16<br>
<b><span style='font-weight:bold'>To:</span></b> Sam Meftahi; 'Benoit GRANGE';
cisco-bba@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [cisco-bba] ADSL
shaping using Hierarchical VP</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Sam,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>A couple of things, I believe the 10k has
a limit enforced via CLI when defining the oversubscription factor (I think it
is 50). In regards to the preservation of PQ traffic under a
oversubscription scenario, the 10k is able to implement a back-pressure
mechanism between the packet scheduler and the SAR indicating what traffic
should be dropped in congestion conditions. This link is a little
self-serving but it validates the 10k does this correctly:</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><a
href="http://www.miercom.com/dl.html?fid=20041015&type=report">http://www.miercom.com/dl.html?fid=20041015&type=report</a></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>That said, this type of implementation can
get complicated and I would advise at least consulting with your local account
team on how best to implement this in your network.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>hope that helps,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Andy</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Sam Meftahi
[mailto:SAF@sonofon.dk] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 17, 2005
12:54 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">aschutz@cisco.com</st1:PersonName>;
Benoit GRANGE; cisco-bba@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [cisco-bba] ADSL
shaping using Hierarchical VP</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi all<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Going thru this document<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=content1><font size=1 color=black face=Arial><span
lang=EN-GB style='font-size:9.0pt;font-weight:bold'><a
href="http://www.cisco.com/en/US/products/hw/modules/ps2033/products_implementation_design_guide_chapter09186a0080199949.html#16529">http://www.cisco.com/en/US/products/hw/modules/ps2033/products_implementation_design_guide_chapter09186a0080199949.html#16529</a></span></font></span><span
class=content1><font size=1 color=black face=Arial><span style='font-size:9.0pt;
font-weight:bold'><o:p></o:p></span></font></span></p>
<p class=MsoNormal><font size=2 color=navy face="Times New Roman"><span
style='font-size:10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Cisco states that
oversubscribed ports could experience cell drops due to colliding cells. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Cells compete for same
time slot provided by SAR scheduler. And this can even occur in underutilised
ports links. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Does the algorithm take
into consideration all configured VCs or only the ones carrying traffic ? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Either way, there must be
a restriction on how far can a link be overbooked without triggering a high
cell rate the scheduler would not cope with and starts dropping from there.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>TIA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Sam <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Andy Schutz (aschutz) [mailto:<st1:PersonName w:st="on">aschutz@cisco.com</st1:PersonName>]
<br>
<b><span style='font-weight:bold'>Sent:</span></b> 14. januar 2005 17:08<br>
<b><span style='font-weight:bold'>To:</span></b> 'Benoit GRANGE'; Sam Meftahi;
cisco-bba@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [cisco-bba] ADSL
shaping using Hierarchical VP</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Sam,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Take a look at this link: <a
href="http://www.cisco.com/en/US/partner/products/hw/routers/ps133/products_feature_guide09186a00802254b7.html">http://www.cisco.com/en/US/partner/products/hw/routers/ps133/products_feature_guide09186a00802254b7.html</a></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>In regards to what is recommended for
oversubscription factors, I don't think there is a recommended value. It
depends on customer traffic patterns and how much you want to guarantee each
user. I have heard requirements for as little of 4:1 oversubscription to
as high as 50:1 as stated in above link. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Hope that helps.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Andy</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
cisco-bba-bounces@puck.nether.net [mailto:cisco-bba-bounces@puck.nether.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Benoit GRANGE<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 14, 2005
9:31 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Sam Meftahi;
cisco-bba@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [cisco-bba] ADSL
shaping using Hierarchical VP</span></font><span lang=EN-US><o:p></o:p></span></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>Hello,</span></font><font
size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'><o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Which category service
are u using? I am using nrt-VBR. <br>
</span></font><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>[Benoit GRANGE] We
also use this one (and it is the only one supported for Hierarchical VP
shaping).</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Does Cisco recommend any
Oversubscription or overbooking factors values for 7206VXR or 10000.<br>
</span></font><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>[Benoit GRANGE] I
don't know.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Otherwise, which values
is the general ISP community using without causing any degradation?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>I thing it is really up
to you (and your market constraints).</span></font><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>To clarify what I mean by
Oversubscription, it is total SCR bandwidth exceeding line speed and not number
of VCs<o:p></o:p></span></font></p>
</blockquote>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>You can not really
oversubscribe the number of VC being really in use (you may be able to
provision more than the card limit, but they may not be all used at the same
time).</span></font><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Having Sum(SCR) > Card
badnwidth is possible in the Cisco 10k since release 12.3XI<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Benoît<o:p></o:p></span></font></p>
</blockquote>
</blockquote>
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