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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Kila, do you have Ram’s book “Advance
QoS for Multi-service IP/MPLS Networks”? His book does a good job
of explaining the behavior of traffic conditioning in the hierarchal model.<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>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
alcatel-nsp-bounces@puck.nether.net
[mailto:alcatel-nsp-bounces@puck.nether.net] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Kila Hsu<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, February 19, 2009
12:44 PM<br>
<b><span style='font-weight:bold'>To:</span></b> alcatel-nsp@puck.nether.net;
GARCIA DEL RIO Diego<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [alcatel-nsp]
Question about Service QoS Policies on 7750SR</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Thanks a lot, Diego!<br>
<br>
I still have several question though. Assume that we don't have a port
scheduler defined, and we do get congestion. As you mentioned, now queues are
transmitted at the physical level using round robin, with expedited queues
being served first.<br>
<br>
1. By "queues" do you mean the queue-to-be-transmitted for each
SAP? If there are multiple tier 1 schedulers, or orphaned queues in a SAP,
which one will get transmitted? (or will these queues now become the
candidates for the physical level round-robin?)<br>
<br>
2. How are the weights assigned for all these queues? Or is this just an
plain old round-robin with every queue equally weighted?<br>
<br>
3. If under each SAP I have hierarchical scheduler, it is possible that for
one SAP, the next packet to be sent comes from an best-effort queue but the
next-next one comes from an expedited queue (although this is a bad design).
In this case, will this SAP have to wait in the physical level until the
expedite queues from other SAPs are transmitted?<br>
<br>
I hope I state the problems clearly. Thanks again for all who kindly answer!<br>
<br>
Best Regards,<br>
Kila Hsu<br>
<br>
--- On <b><span style='font-weight:bold'>Mon, 2/16/09, <st1:City w:st="on">GARCIA</st1:City>
<st1:State w:st="on">DEL</st1:State> <st1:place w:st="on">RIO</st1:place> Diego
<i><span style='font-style:italic'><Diego.Garcia_Del_Rio@alcatel-lucent.be></span></i></span></b>
wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>From: GARCIA DEL RIO
Diego <Diego.Garcia_Del_Rio@alcatel-lucent.be><br>
Subject: Re: [alcatel-nsp] Question about Service QoS Policies on 7750SR<br>
To: alcatel-nsp@puck.nether.net<br>
Date: Monday, February 16, 2009, 1:15 PM<o:p></o:p></span></font></p>
<div id=yiv1249666742>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Hi Hsu,</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>
If your version of TiMOS allows it, you could run a “port-parent”
scheduler, which allows you to map the parent scheduler of the queues in the
SAPs to a port-level scheduler that will distribute bandwidth between all it’s
children according to the configured prioritied.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>
If you don’t have the port-schduler function (it appeared in TiMOS
5.0r4 and onwards), sap-queues and schedulers behave “as
expected” when there is no congestion at the port level, that is, all
egressing traffic is less than the port’s egress rate.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>
If there is congestion though, and no port-scheduler is configured, queues
are indeed served in round-robin fashion with the “expedited”
queues (in in-profile state) being served exhaustively, then
“best-effort” (in-profile) and finally all out-of-profile queues.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>
So.. in short, if using TiMOS 5.0 or newer, take a look at port-level
schedulers ;-)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Cheers!</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<div>
<p><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>Diego Garcia <st1:City w:st="on"><st1:place
w:st="on">del Rio</st1:place></st1:City></span></font><font color=navy
face="Trebuchet MS"><span style='font-family:"Trebuchet MS";color:navy'><br>
</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>New Product
Introduction - Network Design Engineer</span></font><font color=navy><span
style='color:navy'> <br>
</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>IP Division</span></font><font
color=navy><span style='color:navy'><br>
</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>Alcatel-Lucent
- Antwerpen</span></font><font color=navy face="Trebuchet MS"><span
style='font-family:"Trebuchet MS";color:navy'><br>
</span></font><st1:City w:st="on"><st1:place w:st="on"><font size=2
color=black face="Trebuchet MS"><span style='font-size:10.0pt;font-family:
"Trebuchet MS";color:black'>Mobile</span></font></st1:place></st1:City><font
size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:black'>: +32 4734 30 245<br>
OnNET 2 605 3871<br>
Phone (+32) 3 2403871 </span></font><font color=navy><span style='color:navy'><br>
</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>e-mail
diego.garcia_del_rio@alcatel-lucent.com</span></font><font color=navy><span
style='color:navy'> </span></font><o:p></o:p></p>
<p><font size=2 color=navy face="Trebuchet MS"><span style='font-size:10.0pt;
font-family:"Trebuchet MS";color:navy'><<<br>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>
alcatel-nsp-bounces@puck.nether.net
[mailto:alcatel-nsp-bounces@puck.nether.net] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Kila Hsu<br>
<b><span style='font-weight:bold'>Sent:</span></b> 16 February 2009 16:46<br>
<b><span style='font-weight:bold'>To:</span></b> alcatel-nsp@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [alcatel-nsp] Question
about Service QoS Policies on 7750SR</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Hi,<br>
Thanks a lot to Mark for the information about the ways to share a port
among SAPs.<br>
However, my boss seems to like the idea that each SAP can have its own
queues and schedulers though..<br>
So say if I still need to deploy QoS on a per-SAP base, anyone know how the
packets from different SAPs defined on a common port would be scheduled, if
each has its own queue/scheduler?<br>
From the config guide I do see the "expedite" setting have
something to do with "hardware scheduler", but it is not clear if
the setting is used in cases like this.<br>
Any idea would be appreciated.<br>
<br>
thanks,<br>
Kila Hsu<o:p></o:p></span></font></p>
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<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'>_______________________________________________<br>
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