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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Alex,<br>
<br>
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<div style="direction: ltr;" id="divRpF995544"><font color="#000000" face="Tahoma" size="2"><b>From:</b> Alex Afanasyev [alexander.afanasyev@ucla.edu]<br>
<b>Sent:</b> Sunday, January 18, 2015 5:19 AM<br>
<b>To:</b> Salvatore SIGNORELLO<br>
<b>Cc:</b> ndnsim@lists.cs.ucla.edu<br>
<b>Subject:</b> Re: [ndnSIM] Red status for the faces<br>
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<blockquote type="cite" class="">
<div class="">On Jan 17, 2015, at 5:59 AM, Salvatore SIGNORELLO <<a href="mailto:salvatore.signorello@uni.lu" class="" target="_blank">salvatore.signorello@uni.lu</a>> wrote:</div>
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<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">Hi
Alex,</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
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<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">thank
you for the answer, few more questions inline.<br class="">
<br class="">
Best,<br class="">
Salvo<br class="">
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<div id="divRpF237232" class="" style="direction:ltr"><font class="" face="Tahoma" size="2"><b class="">From:</b><span class="Apple-converted-space"> </span>Alex Afanasyev [<a href="mailto:alexander.afanasyev@ucla.edu" class="" target="_blank">alexander.afanasyev@ucla.edu</a>]<br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Friday, January 16, 2015 9:12 PM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>Salvatore SIGNORELLO<br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:ndnsim@lists.cs.ucla.edu" class="" target="_blank">ndnsim@lists.cs.ucla.edu</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [ndnSIM] Red status for the faces<br class="">
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<div class="">Hi Salvatore,</div>
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<div class="">On Jan 16, 2015, at 12:40 AM, Salvatore SIGNORELLO <<a href="mailto:salvatore.signorello@uni.lu" class="" target="_blank">salvatore.signorello@uni.lu</a>> wrote:</div>
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<div class="" style="font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; direction:ltr; font-family:Tahoma; font-size:10pt">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">Hi
all,</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">I've
written out a simple tracer that prints the status of the faces for</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">the
Fib entries, to troubleshoot the weird behavior I've experienced</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">with
some simulations, where all the nodes use a BestRoute forwarding</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">strategy.</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">Well,
I've never seen a Face marked as RED using the new developed</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">'ifaceTracer'
after several attempts in different simulation scenarios,</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">the
same holds even if I simulate scenario with link failures using the</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">ndn::LinkControlHelper
class. So, I've started digging into the source</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">code
to see who is really marking the interfaces as RED. By now I've</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">just
found the InvalidateAll method of the FibImpl class. This method</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">iterates
all the Fib's entries and for each of them it iterates the list</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">of
faces and it sets the status to Red calling in turn the Invalidate</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">method
of the FaceMetric class. The InvalidateAll method is used only by</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">the
GlobalRoutingHelper class to clean the status of all the Fib's</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">entries
before starting the computation of the routes. Is there anything</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">I've
missed? Could anyone please confirm the workflow summed up above?</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
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<div class="">Yes. This is the only place where RED status is set in the codebase.<br class="">
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<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">May
be this is a silly question,but I ask you anyway. Has the Red status</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">been
introduced as something to be marked just by the routing plane?</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">If
this is the case, the simulation study conducted and reported into</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">the
paper "A case for stateful forwarding plane" did not use red</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">labeling.
Am I wrong?</span></div>
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<div>Red flag was meant to represent a face with some fatal conditions, that is known to definitely not be able to retrieve the data under the prefix. We did not go into exact details when exactly this condition happens.</div>
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Ok for the answer to the former question, but I'm not sure that I've got the answer to the latter question about the simulation study. Was it a "yes, we did use it" or wasn't?<br>
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<div class="" style="font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; direction:ltr; font-family:Tahoma; font-size:10pt">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">Further,
what about the probing of (inter)faces? It seems to me that also the codebase has foreseen it, but nobody is really using it.</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
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<div class="">Depending on how you define probing. The codebase doesn’t implement any active probing. For the passive probing (trying different face if interest is retransmitted while PIT entry is alive), the status of faces may change to yellow (where the
face is temporarily demoted).</div>
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<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">Yeap,
I meant active probing. So actually if you mark a face as red, the</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">forwarding
plane has no way of setting it back to working status, isn't</span><br class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">
<span class="" style="color:rgb(46,52,54); font-family:monospace; font-size:15px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline!important">it?<br class="">
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<div class="">The point of active probing is to find working/not-working faces. The strategy that is doing probing would certainly need to ignore the current status.</div>
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<div class="">Alex</div>
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