<div dir="ltr">Hi Spyros,<div><br></div><div>Thank you for your reply. Honestly, I have checked the developer guide before asking and this is what I found on NSS Strategy:</div><div>6.2.4 NCC Strategy
The NCC strategy 8
is an reimplementation of CCNx 0.7.2 default strategy [16]. It has similar algorithm but is not guaranteed
to be equivalent. This strategy is implemented as nfd::NccStrategy class. <br></div><div><br></div><div>And the citation lead to the same website provided above , which I have check and didn't understand how it measures delay for each interface. </div><div><br></div><div>Now I am checking the code here "<a href="https://github.com/0xbb/amus-ndnSIM/blob/master/NFD/daemon/fw/ncc-strategy.cpp">https://github.com/0xbb/amus-ndnSIM/blob/master/NFD/daemon/fw/ncc-strategy.cpp</a>"</div><div><br></div><div>If anyone can give few words explaining this strategy, I would be thankful.</div><div><br></div><div>Thanks!</div><div>Ahmed</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jan 29, 2016 at 6:11 PM, Spyridon (Spyros) Mastorakis <span dir="ltr"><<a href="mailto:mastorakis@cs.ucla.edu" target="_blank">mastorakis@cs.ucla.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Ahmed,<div><br></div><div>it would be a good idea to take a look at the NFD developer’s guide as well. There is a section describing each strategy:</div><div><br></div><div><a href="http://named-data.net/wp-content/uploads/2015/10/ndn-0021-5-nfd-developer-guide.pdf" target="_blank">http://named-data.net/wp-content/uploads/2015/10/ndn-0021-5-nfd-developer-guide.pdf</a></div><div><br></div><div>Hope that this helps.</div><div><span class="HOEnZb"><font color="#888888"><br><div>
<div><div><div><span style="float:none;display:inline!important">Spyridon (Spyros) Mastorakis</span><br><span style="float:none;display:inline!important">Personal Website: </span><a href="http://cs.ucla.edu/~mastorakis/" target="_blank">http://cs.ucla.edu/~mastorakis/</a><br><span style="float:none;display:inline!important">Internet Research Laboratory</span><br><span style="float:none;display:inline!important">Computer Science Department</span><br><span style="float:none;display:inline!important">UCLA</span></div><div><span style="float:none;display:inline!important"><br></span></div></div></div><div><br></div><br>
</div></font></span><div><div class="h5">
<br><div><blockquote type="cite"><div>On Jan 29, 2016, at 1:39 AM, Ahmed Sadek <<a href="mailto:don1559@gmail.com" target="_blank">don1559@gmail.com</a>> wrote:</div><br><div><div dir="ltr">Hi Junxiao,<div><br></div><div>Thank you for your reply.</div><div><br></div><div><div style="font-size:12.8px">What routing metrics to use is an <a href="http://redmine.named-data.net/issues/2010" target="_blank">unsolved problem</a>.</div><div style="font-size:12.8px">NDN testbed is using round-trip time (in milliseconds) measured by IP ping as its routing metrics.</div></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><font color="#ff0000"><b>So hop count is not used as a metric ?</b></font></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><span style="font-size:12.8px">See </span><a href="http://redmine.named-data.net/projects/nfd/wiki/CcndStrategy" style="font-size:12.8px" target="_blank">CcndStrategy</a><span style="font-size:12.8px"> for information on NCC strategy.</span><br></div><div style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div><div><font color="#ff0000"><span style="font-size:12.8px"><b>I read it before sending the question and didn't understand it, how NCC is measuring delay on interfaces and selecting the lowest delay ? Is it sending IP ping messages broadcast flood on each interface each few seconds and ranking the interfaces based on this values ? and does it take prefix into account or only interfaces ?</b></span></font></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Thanks!</div><div style="font-size:12.8px">Ahmed</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 28, 2016 at 9:47 PM, Junxiao Shi <span dir="ltr"><<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizona.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Ahmed<div><br></div><div>What routing metrics to use is an <a href="http://redmine.named-data.net/issues/2010" target="_blank">unsolved problem</a>.</div><div>NDN testbed is using round-trip time (in milliseconds) measured by IP ping as its routing metrics.</div><div><br></div><div>See <a href="http://redmine.named-data.net/projects/nfd/wiki/CcndStrategy" target="_blank">CcndStrategy</a> for information on NCC strategy.</div><div><br></div><div>Yours, Junxiao</div><div><br><div><blockquote type="cite"><div><div><div>On Jan 28, 2016, at 9:00 AM, Ahmed Sadek <<a href="mailto:don1559@gmail.com" target="_blank">don1559@gmail.com</a>> wrote:</div><br></div></div><div><div><div><div dir="ltr">Dear All,<div><br></div><div>I am trying to understand better the two strategies of best route and NCC. My understanding is:</div><div><br></div><div>BestRoute: This strategy relies on routing information and
forwards Interests on the path with the lowest costs considering
a specific metric. <br></div><div><font color="#ff0000">So I was wondering what routing metrics options we can consider for this strategy ? </font></div><div><br></div><div>NCC: Interests
are forwarded to the interface, that provides content with
the lowest delay.</div><div><font color="#ff0000">So how is the delay is measured here on a low level for each interface? and is it measured for each prefix for each interface or only for each interface ?</font></div><div><br></div><div>I really appreciate any explanation or if you point me to a link explaining it.</div><div><br></div><div>Thanks !</div><div><br></div><div>Ahmed Sadek</div></div></div></div>
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