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The original experiment was done with our first NLSR implementation on CCND. The codebase has been completely changed for NLSR, NFD and ndn-cxx so it’s difficult to know exactly what part contributed to the difference. One suggestion I have is to run the
experiment longer to see if there’s any switching back to the lower cost path. My suspicion is something in the best-route strategy that’s preventing the switching back in a timely manner.
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<div class="">Nick: could you repeat the experiment and investigate what might be the problem? Thanks.<br class="">
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Lan</div>
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<blockquote type="cite" class="">
<div class="">On Nov 28, 2016, at 6:14 PM, sepehr abdous <<a href="mailto:sepehrabdous1375@gmail.com" class="">sepehrabdous1375@gmail.com</a>> wrote:</div>
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<div class="">Hello all,<br class="">
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I'm trying to implement the following topology with the information bellow:<span class="gmail-im"><br class="">
<span id="cid:ii_158ad655138befc9"><Screenshot from 2016-11-08 03-29-33.png></span><br class="">
</span>
<div class="">
<div class=""><span id="cid:ii_158ad65939223660"><2.png></span><br class="">
</div>
<div class="">and the expected result is:<br class="">
<span id="cid:ii_158ad68956a28393"><Untitled.png></span><br class="">
</div>
<div class="">but when I used the experiment which will be added bellow I got the following result:<br class="">
<span id="cid:ii_158ad6b901639f9b"><image(2).png></span><br class="">
</div>
<div class="">and I have 2 questions:<br class="">
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<div class="">(1) why the convergence takes 20 pings while it's expected to take 60 pings while I set ctime=60?<br class="">
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<div class="">(2)why does the last 20 pings still about 60 ms while they're expected to be about 40 ms like the first 60 pings?<br class="">
<br class="">
</div>
<div class="">the experiment that caused the figure above is:<br class="">
<br class="">
<span class="gmail-im"><br class="">
class test(CustomExperiment):<br class="">
<br class="">
def __init__(self, args):<br class="">
self.pctTraffic = float(args["pctTraffic"])<br class="">
print "Using %f traffic" % self.pctTraffic<br class="">
self.nFaces = int(input())<br class="">
print "number of faces is %f" %self.nFaces<br class="">
if self.nFaces==0:<br class="">
</span> args["nPings"] = 1000<br class="">
if self.nFaces==1:<br class="">
args["nPings"] = 700<br class="">
self.strategy = args["strategy"]<br class="">
print self.strategy<span class="gmail-im"><br class="">
CustomExperiment.__init__(<wbr class="">self, args)<br class="">
<br class="">
def run(self):<br class="">
self.startPctPings("node2","<wbr class="">node6")<br class="">
<br class="">
time.sleep(60)<br class="">
<br class="">
for host in self.net.hosts:<br class="">
if <a target="_blank" href="http://host.name/" class="">host.name</a> == "node4":<br class="">
self.failNode(host)<br class="">
break<br class="">
<br class="">
if self.nFaces==1:<br class="">
print "Waiting " + str(self.convergenceTime) + " seconds for convergence..."<br class="">
time.sleep(self.<wbr class="">convergenceTime)<br class="">
print "...done"<br class="">
<br class="">
# To check whether all the nodes of NLSR have converged<br class="">
didNlsrConverge = True<br class="">
<br class="">
# Checking for convergence<br class="">
for host in self.net.hosts:<br class="">
if <a target="_blank" href="http://host.name/" class="">host.name</a>=="node2":<br class="">
statusRouter = host.cmd("nfd-status -b | grep /ndn/edu/%C1.Router/cs/")<br class="">
statusPrefix = host.cmd("nfd-status -b | grep /ndn/edu/")<br class="">
didNodeConverge = True<br class="">
for node in self.nodes.split(","):<br class="">
</span> # print node<br class="">
if node!="node4":<span class="gmail-im"><br class="">
if ("/ndn/edu/%C1.Router/cs/" + node) not in statusRouter:<br class="">
</span> <wbr class=""> print "fuck"<span class="gmail-im"><br class="">
<wbr class=""> didNodeConverge = False<br class="">
<wbr class=""> didNlsrConverge = False<br class="">
if str(host) != node and ("/ndn/edu/" + node) not in statusPrefix:<br class="">
</span> <wbr class=""> print"fuck2"<span class="gmail-im"><br class="">
<wbr class=""> didNodeConverge = False<br class="">
<wbr class=""> didNlsrConverge = False<br class="">
<br class="">
host.cmd("echo " + str(didNodeConverge) + " > convergence-result &")<br class="">
<br class="">
if didNlsrConverge:<br class="">
print("NLSR has successfully converged.")<br class="">
else:<br class="">
print("NLSR has not converged. Exiting...")<br class="">
self.net.stop()<br class="">
</span> self.sys.exit(1)<br class="">
time.sleep(60)<br class="">
<br class="">
# time.sleep(120)<span class="gmail-im"><br class="">
<br class="">
else:<br class="">
time.sleep(120)<br class="">
<br class="">
for host in self.net.hosts:<br class="">
if <a target="_blank" href="http://host.name/" class="">host.name</a> == "node4":<br class="">
self.recoverNode(host)<br class="">
<br class="">
time.sleep(20)<br class="">
<br class="">
CustomExperiment.register("<wbr class="">test", test)<br class="">
<br class="">
</span></div>
<div class=""><span class="gmail-im">Thank you<br class="">
</span></div>
<div class="">-- <br class="">
<div class="gmail_signature">
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</blockquote>
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