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<DIV><FONT face=Arial size=2>Rod,</FONT></DIV>
<DIV><FONT face=Arial size=2>I run a small CDN oriented to audio/video
distribution in Central Europe region. You mentioned challenges that CDN
are facing. There are several of these:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1) Geographic load distribution</FONT></DIV>
<DIV><FONT face=Arial size=2>- in example, you have to have enough capacity in
each distribution area that is being potentionally served by your customers
(media companies).</FONT></DIV>
<DIV><FONT face=Arial size=2>2) Computing power</FONT></DIV>
<DIV><FONT face=Arial size=2>- you have to have in each POP adequate computing
power that allows you to use full bandwidth available in that POP</FONT></DIV>
<DIV><FONT face=Arial size=2>3) Network capacity in each POP</FONT></DIV>
<DIV><FONT face=Arial size=2>- self explaining</FONT></DIV>
<DIV><FONT face=Arial size=2>4) Content moving</FONT></DIV>
<DIV><FONT face=Arial size=2>- you have to optimise internal data flows between
POPs</FONT></DIV>
<DIV><FONT face=Arial size=2>5) User redirection</FONT></DIV>
<DIV><FONT face=Arial size=2>- You have to implement a scalable mechanisms that
redirects users to the closes POP. You can use application redirect (fast, but
not so much scalable), DNS redirect (scalable, but not so fast) or anycasting
(this needs cooperation with ISP).</FONT></DIV>
<DIV><FONT face=Arial size=2>6) Costs of the system</FONT></DIV>
<DIV><FONT face=Arial size=2>- Most CDNs are designed for peaking traffic, but
load is more dynamic that in traditional networks.</FONT></DIV>
<DIV><FONT face=Arial size=2>7) Play alone</FONT></DIV>
<DIV><FONT face=Arial size=2>There is almost no way for handover traffic to
other CDN. No standards, no kinf of interconnection agreement.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>These points are only a rough overview, this
ecosystem is developping and challenges also depend on the starting conditions
and region where you are running you CDN.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>
Regards</FONT></DIV>
<DIV><FONT face=Arial size=2>
Michal</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Rod.Beck@hiberniaatlantic.com
href="mailto:Rod.Beck@hiberniaatlantic.com">Rod Beck</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=williamsjj@digitar.com
href="mailto:williamsjj@digitar.com">Jason J. W. Williams</A> ; <A
title=pekkas@netcore.fi href="mailto:pekkas@netcore.fi">Pekka Savola</A> ; <A
title=robert@tellurian.com href="mailto:robert@tellurian.com">Robert Boyle</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A
title=alejandro_esquivel@costarricense.cr
href="mailto:alejandro_esquivel@costarricense.cr">ALEJANDRO ESQUIVEL
RODRIGUEZ</A> ; <A title=nanog@merit.edu
href="mailto:nanog@merit.edu">nanog@merit.edu</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 06, 2007 23:10</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Content Delivery Networks</DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV><!-- Converted from text/plain format -->
<P><FONT size=2>Can anyone give a breakdown of the different kinds of content
deliver networks? For example, we have Akamai, which appears to be a pure
Layer 3 network that is tailored to pushing relatively small files like web
pages and we have Lime Light Networks, which is a mix of Layer 1 and Layer 3,
that focuses on bigger files like video streams.<BR><BR>Any insights out
there? And what are the major challenges in making scalable content delivery
networks?<BR><BR>Roderick S. Beck<BR>Director of EMEA Sales<BR>Hibernia
Atlantic<BR>1, Passage du Chantier, 75012 Paris<BR><A
href="http://www.hiberniaatlantic.com">http://www.hiberniaatlantic.com</A><BR>Wireless:
1-212-444-8829.<BR>Landline: 33-1-4346-3209<BR>AOL Messenger:
GlobalBandwidth<BR><A
href="mailto:rod.beck@hiberniaatlantic.com">rod.beck@hiberniaatlantic.com</A><BR>rodbeck@erols.com<BR>``Unthinking
respect for authority is the greatest enemy of truth.'' Albert
Einstein.<BR><BR><BR></FONT></P><FONT face=Tahoma size=2><FONT color=#0000ff>
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