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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>Hi Pawel,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>Try egress-rate under the port itself.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>conf port 1/1/1 ethernet egress-rate<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>Not sure but you might also need to reference the port parent
scheduler from your service schedulers.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'>Anton<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#17365D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
alcatel-nsp-bounces@puck.nether.net
[mailto:alcatel-nsp-bounces@puck.nether.net] <b>On Behalf Of </b>Pawel_Sikora@netia.pl<br>
<b>Sent:</b> Monday, March 28, 2011 6:42 PM<br>
<b>To:</b> alcatel-nsp@puck.nether.net<br>
<b>Subject:</b> [alcatel-nsp] Smoothness of egress shaped scheduler-policy with
multi-service-site.<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi.</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I was forced to
use ill-behaving transmission devices (EoSDH) that have netto speed STM-1 and
GE ports, but have only single 16kB packet buffer available at the bottleneck.</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The traffic I
must pass through it is rather bursty* and comes from the GE port of
7750.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>It is sourced
from dozen of SAP-s (several different services with aggregated classes).</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>*(mainly
Internet access)</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I can shape it
together to the given average max rate (i.e.150Mbps), using multiservice-site
scheduler-policy with parent port scheduler, but observe that </span><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>still some
bursts of traffic leaves from the SR port that 16kB buffer cannot accomodate
(mtu used on every service is no more than 1564B).</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The symptoms
are both reported as buffer overflows on EoSDH port (sdh side) and visible as
lost packets in ordinary ping.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Unfortunately
the lost packets are observed even at average utilization of 70-80 Mbps, far
below the physical link capacity.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Constant,
non-bursty flows generated form traffic tester show proper shaping and smooth
operation of EoSDH box,</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> but after
introducing some burstiness on traffice source (that enters SR) I observe drops
on the the EoSDH small buffer.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Is there any
parameter or guideline how to tune the scheduler behaviour , to achieve better
smoothness on egress port traffic?</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In contrast,
I've connected the Cisco 3750 with ordinary egress port bandwith limit feature
(still using four different traffic classes within shaped speed),</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>and there are
no drops on EoSDH box, up to the link capacity on the same traffic type.</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Pawel/</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>(SR-7 with
8.0.6 and IOM2)</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-----------------------------------------------------<br>
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również sporządzać jakichkolwiek ich kopii.</span><o:p></o:p></p>
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