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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>One way to go about analyzing this is to look at the product
placement graphs of the major manufacturers and cross-reference that with the
supported configurations. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a href="http://www.juniper.net/products/301015.pdf">http://www.juniper.net/products/301015.pdf</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://www.cisco.com/en/US/products/hw/routers/index.html">http://www.cisco.com/en/US/products/hw/routers/index.html</a>
(click on Routers for Service Providers)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have first-hand knowledge of some of the mid- to hi-end Cisco
platforms which enable WRED and some degree of fairness automatically on every
classification type that is created. The user is then capable of
configuring large scale traffic classification and associated QoS. Many
of the large routers have so many interfaces that some degrees of QoS is needed
internally just to keep the links full.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Just about every platform, including my linksys router at
home, supports simple priorities. I have this feature enabled to prevent
my wife’s photo uploads from knocking my VoIP phone off-line. The
higher-end Cisco routers support what is called the modular QoS CLI which is
basically a set of classification commands and the corresponding QoS treatment
for each class. The first link below makes me think that Juniper has a
similar command set.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Configuration pointers:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://www.juniper.net/techpubs/software/junos/junos76/swconfig76-cos/html/cos-overview7.html#1024445">http://www.juniper.net/techpubs/software/junos/junos76/swconfig76-cos/html/cos-overview7.html#1024445</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://www.cisco.com/en/US/products/ps5763/products_configuration_guide_chapter09186a00803b7c7b.html#wp1035219">http://www.cisco.com/en/US/products/ps5763/products_configuration_guide_chapter09186a00803b7c7b.html#wp1035219</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Most service providers take provisioning and QoS pretty
seriously since bandwidth and differentiated services are at the heart of their
revenue stream. Big telephone companies seem to have well educated QoS staff
that asks hard questions of routing manufactures. I don’t have
first-hand knowledge on other zones of the net such as core or customer
premises. However, I have heard more than once that companies deploying
VoIP services internally usually require a re-vamp of their internal QoS before
their fancy new telephones start working as well as the old ones did :)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I hope this helps,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Chris Kappler<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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