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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Alex,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks again, I had adopted an approach similar to the second one here. I removed the check for a valid FIB entry,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">but then added a simple SetFibEntry routine to add one to the PIT when a FIB entry is known, before the interest is<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">forwarded, to keep the statistics parts happy. It seems to work, but I will need to check the statistics part a little<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">more carefully.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Asit.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<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""> Alexander Afanasyev [mailto:cawka1@gmail.com]
<b>On Behalf Of </b>Alex Afanasyev<br>
<b>Sent:</b> Friday, May 10, 2013 11:54 AM<br>
<b>To:</b> Asit Chakraborti<br>
<b>Cc:</b> ndnsim@lists.cs.ucla.edu<br>
<b>Subject:</b> Re: [ndnSIM] Question on FIB matching<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Asit,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm thinking to remove a requirement to have a valid FIB entry, in order to attempt to process interests (though I will still PIT creation procedure), but don't yet have a time frame for that.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You can add default routes automatically using ndn::StackHelper::SetDefaultRoutes method <a href="http://ndnsim.net/doxygen/classns3_1_1ndn_1_1_stack_helper.html#a12b1c8f16bad953ac3b9bb4a6ab1fcab">http://ndnsim.net/doxygen/classns3_1_1ndn_1_1_stack_helper.html#a12b1c8f16bad953ac3b9bb4a6ab1fcab</a>.
If you don't want to have a dummy prefixes in FIB, you can try to remove lines 350-352 in model/pit/ndn-pit-impl.h, but you probably would need to check other parts of the code, since it was assumed that PIT entry has always a valid reference to PIT: A FIB
entry is basically a place where information about past performance of Interest/Data exchanges within this prefix can be stored. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">---<o:p></o:p></p>
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<p class="MsoNormal">Alex <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On May 8, 2013, at 5:08 PM, Asit Chakraborti <<a href="mailto:Asit.sc.Chakraborti@huawei.com">Asit.sc.Chakraborti@huawei.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Alex,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks for the response, that makes sense. I needed to process the interests differently and was planning to create a new</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Forwarding strategy, however, the interests got dropped and didn’t get delivered to the new strategy as there was no</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">FIB match. Either I have to modify the common code to allow PIT entries with no matching FIB (not sure how badly that</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">would violate the entire model), or may be I will try to have dummy “/” entries in the FIB…</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Asit. </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Alexander
Afanasyev [mailto:cawka1@<a href="http://gmail.com">gmail.com</a>]<span class="apple-converted-space"> </span><b>On Behalf Of<span class="apple-converted-space"> </span></b>Alex Afanasyev<br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, May 08, 2013 4:28 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>Asit Chakraborti<br>
<b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:ndnsim@lists.cs.ucla.edu">ndnsim@lists.cs.ucla.edu</a><br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [ndnSIM] Question on FIB matching</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Hi Asit,<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">The currently implemented way always attempts to lookup FIB and create PIT entry for incoming interest, and if there is a CS match, such a PIT entry will be immediately satisfied.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">The main reason behind this implementation is to unify metric calculation: for every interest there will always be either new or existing PIT entry, and every satisfied interest can be tracked via PIT entry satisfaction. It is technically<span class="apple-converted-space"> </span>
possible to change the implementation, but I'm not yet sure if this would get any major benefits.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">As for last question. Yes, it is assumed that there is always some FIB entry, at least a default entry for root prefix, that can match incoming interests. And if there is no such entry, then NDN router is not willing to do anything with
such interests.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Do you have a specific scenario where this assumption doesn't hold? It is relatively easy to create an alternative forwarding strategy with slightly different processing logic.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Alex<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On May 8, 2013, at 3:31 PM, Asit Chakraborti <<a href="mailto:Asit.sc.Chakraborti@huawei.com"><span style="color:purple">Asit.sc.Chakraborti@huawei.com</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hi Alex,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">My understanding of the code could be wrong, but it seems we require a FIB match on an incoming</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Interest even before a CS match. Any historical reason behind this ? Or is it just the fact that with</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">the current model and APIs, a FIB entry usually exists if the content is in content store ?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thanks,<br>
Asit.</span><o:p></o:p></p>
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