<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 24, 2016, at 8:16 AM, Burke, Jeff <<a href="mailto:jburke@remap.ucla.edu" class="">jburke@remap.ucla.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div style="" class="">Thanks for the explanation...!</div>
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Let me try a simple explanation: </div>
<div style="" class="">1/ a LINK is to get an interest to the place where the name in the interest can be used directly for lookup</div>
<div class="">2/ routers do FIB lookup using LINK first (if interest carries one), until the interest reaches the place (so called "region") where
<font color="#ff0000" class="">its</font> name is in the FIB, then the router will do look up using the interest name</div>
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<div style="" class="">(Just to double-check - what's the "its" here?) </div></div></div></blockquote><div><br class=""></div>its=the interest</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;" class="">
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<div class="">3/ a router decides whether the LINK has finished its job by comparing LINK with its own name: if the LINK is either its prefix or an exact match to the name, then the LINK is no longer needed.</div>
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<div style="" class="">Not sure I follow – why should the router care whether the LINK name has anything to do with
<i class="">its </i>name, shouldn't it only care if it can forward based on the Interest name or not? (And, I guess, if it is "responsible" the LINK prefix?) </div></div></div></blockquote><div><br class=""></div>the router should first consider LINK</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;" class="">
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<div class="">I think I understand the basic idea but am confused about the introduction of the router's administrative identity into forwarding decisions. Isn't the point simply that the Interest reaches a router that is 1) sufficiently "responsible" for the LINK
prefix that it can ignore it and 2) capable of forwarding the Interest name itself? I guess this is the point of the regions list – to define responsibility? </div></div></div></div></blockquote><div><br class=""></div>it is much less of "responsibility" per se, but the interest needs to reach a place where the name in the interest can be use used for forwarding.</div><div><br class=""></div><div><br class=""></div><div><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;" class=""><div style="" class="">
<div class="">(Also, if I am correct, the word 'region' seems to unnecessarily imply a perimeter / geographic boundary rather than a capability. I wonder if it is the right term.)</div></div></div></div></blockquote><div><br class=""></div>not sure what you meant by "capability".</div><div>the issue here is whether the name carried in the interest can match anything in the FIB</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;" class=""><div style="" class="">
<div class="">To use a specific example:</div>
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<div class="">When an Interest with LINK /com/microsoft/healthvault reaches a router /com/microsoft/routers/us/west/foo/47 at the edge of its AS, that router could have a region entry for "/com/microsoft/healthvault" and directly forward "/org/openmhealth" appropriately.
</div></div></div></div></blockquote><div><br class=""></div>I did not follow how the above: where is this "/org/openmhealth"? </div><div><br class=""></div><div>step up a level: there seems some conceptual cross talk here. Maybe best we get together with a whiteboard rather than using this ineffective email</div><div><br class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;" class=""><div style="" class=""><div class="">This doesn't meet the link prefix matching requirement but isn't unreasonable...? Or am I missing something?</div>
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<div class="">Every entity in an NDN network should know its own name (how it learns the name is design/implementation question).</div>
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<div style="" class="">Yes, but does entity name correspond directly to forwarding responsibility? (Is this convention or requirement?)</div>
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<div style="" class="">Thanks,</div>
<div style="" class="">Jeff</div>
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<span style="font-weight:bold" class="">From: </span>Lixia Zhang <<a href="mailto:lixia@cs.ucla.edu" class="">lixia@cs.ucla.edu</a>><br class="">
<span style="font-weight:bold" class="">Date: </span>Tuesday, February 23, 2016 at 3:46 PM<br class="">
<span style="font-weight:bold" class="">To: </span>Jeff Burke <<a href="mailto:jburke@remap.ucla.edu" class="">jburke@remap.ucla.edu</a>><br class="">
<span style="font-weight:bold" class="">Cc: </span>"<a href="mailto:nfd-dev@lists.cs.ucla.edu" class="">nfd-dev@lists.cs.ucla.edu</a>" <<a href="mailto:nfd-dev@lists.cs.ucla.edu" class="">nfd-dev@lists.cs.ucla.edu</a>><br class="">
<span style="font-weight:bold" class="">Subject: </span>Re: [Nfd-dev] What is a "region" ?<br class="">
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we are in group meeting now and explained how LINK (= forwarding hint) works to Zhehao and Haitao. We also trying to figure out a solution to the function you wanted (NDNfit's original design was based on a misconception of LINK).
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<div class="">LINK is a forwarding hint, it just carries an interest to the place where the name in the interest can be used directly for lookup.</div>
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<div class="">Lixia</div>
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<div class="">On Feb 23, 2016, at 1:24 PM, Burke, Jeff <<a href="mailto:jburke@remap.ucla.edu" class="">jburke@remap.ucla.edu</a>> wrote:</div>
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<div class="">Hi,</div>
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<div class="">Even after looking at relevant sections in the NFD developer's guide, we are blocked on finishing the NDNFit forwarding hint design by not understanding the specific definition of what a "region" is, and how they should be confirmed in practice... </div>
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<div class="">For example, see section 4.2 of the NFD developer's guide.</div>
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<div class=""><span id="cid:597A9946-58BB-4C0C-A3FA-3825AEE7390A" class=""><Screenshot 2016-02-23 13.18.21.png></span></div>
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<div class="">1) What is a region? </div>
<div class="">2) How should they be configured at each NFD? </div>
<div class="">3) [And, who is expected to configure them, and when?] </div>
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<div class="">Thanks,</div>
<div class="">Jeff</div>
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