[ndnSIM] Shortest paths

[Chavoosh Ghasemi]

This is not general enough to write a patch, as one can define the topology
in either way (i.e. through a topology file or Config). Note
AnnotatedTopologyReader does not use Config to set up the topology.
A better solution would be finding the latency of attached links through
the node, itself.

On Thu, Sep 6, 2018 at 1:55 PM Klaus Schneider <klaus at cs.arizona.edu> wrote:

> If you use the AnnotatedTopologyReader, you can just set the metric to
> the same value as the delay.
>
> Here's an example from http://ndnsim.net/current/examples.html
>
> >
> > # link section defines point-to-point links between nodes and
> characteristics of these links
> > link
> >
> > # Each line should be in the following format (only first two are
> required, the rest can be omitted)
> > # srcNode   dstNode     bandwidth   metric  delay   queue
> > # bandwidth: link bandwidth
> > # metric: routing metric
> > # delay:  link delay
> > # queue:  MaxPackets for transmission queue on the link (both directions)
> > Node0       Node1       1Mbps       1       10ms    10
> > Node0       Node3       1Mbps       1       10ms    10
>
>
> Moreover, there's the GetAttribute() function:
> https://www.nsnam.org/docs/manual/html/attributes.html
>
>
> Best regards,
> Klaus
>
>
>
> On 06/09/18 11:02, Chavoosh Ghasemi wrote:
> > Is there any way to get the delay of links?
> > It seems you cannot get it through PointToPointChannel as GetDelay
> > method is protected.
> >
> >
> > P.S. The following code does not work
> >      auto t =
> >
> dynamic_cast<ns3::PointToPointChannel*>(&(*(transport->GetNetDevice()->GetChannel())));
> >      t->GetDelay();
> >
> >
> >
> > On Wed, Sep 5, 2018 at 2:00 PM Alex Afanasyev <aa at cs.fiu.edu
> > <mailto:aa at cs.fiu.edu>> wrote:
> >
> >     It calculates based on the Face "metric", which by default set to 1
> >     for each Face (= incidentally, resulting in hop count).  If you
> >     update Face metric with latency related metric represented as an
> >     integert (unfortunately, we don't have anything that is already
> >     available; patches welcome), you will get latency-based calculation
> >     of routes.
> >
> >     --
> >     Alex
> >
> >>     On Sep 5, 2018, at 4:47 PM, chavoosh ghasemi
> >>     <chavoosh.ghasemi.off at gmail.com
> >>     <mailto:chavoosh.ghasemi.off at gmail.com>> wrote:
> >>
> >>     Hi,
> >>
> >>     Apparently, ndnGlobalRoutingHelper::CalculateRoutes() uses *hop
> >>     count* as a metric to compute the shortest paths (correct me if I
> >>     am wrong).
> >>     If that's the case, do we have any module (e.g. a helper) in
> >>     ndnSIM that calculates shortest paths based on link latency?
> >>
> >>     Thanks,
> >>     /- Chavoosh/
> >>
> >>     --
> >>     /*Chavoosh Ghasemi*/
> >>
> >>     Ph.D. Student in Computer Networking
> >>     University of Arizona - Computer Science Department*/
> >>     /*
> >>     */Address: Gould-Simpson 721B, /**/1040 E. 4th Street,
> >>     /*
> >>     */                 Tucson, AZ 85721
> >>
> >>     "The /quieter/ you become, the /more you can hear"//*
> >>     _______________________________________________
> >>     ndnSIM mailing list
> >>     ndnSIM at lists.cs.ucla.edu <mailto:ndnSIM at lists.cs.ucla.edu>
> >>     http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
> >
> >     ______________
> >     Alex Afanasyev
> >     Assistant Professor, SCIS, Florida International University
> >     11200 SW 8th Street, PG6 Room 140D, Miami, FL 33199
> >     phone: +1.305.348.4960 (office); email: aa at cs.fiu.edu
> >     <mailto:aa at cs.fiu.edu>
> >     web: https://users.cs.fiu.edu/~afanasyev/
> >     <https://users.cs.fiu.edu/%7Eafanasyev/>
> >
> >
> >
> >
> > --
> > /*Chavoosh Ghasemi*/
> >
> > Ph.D. Student in Computer Networking
> > University of Arizona - Computer Science Department*/
> > /*
> > */Address: Gould-Simpson 718, /**/1040 E. 4th Street,
> > /*
> > */                 Tucson, AZ 85721
> >
> > "The /quieter/ you become, the /more you can hear"//*
> >
> >
> > _______________________________________________
> > ndnSIM mailing list
> > ndnSIM at lists.cs.ucla.edu
> > http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
> >
>


-- 
*Chavoosh Ghasemi*

Ph.D. Student in Computer Networking
University of Arizona - Computer Science Department
*Address: Gould-Simpson 718, *
*1040 E. 4th Street,*


*                 Tucson, AZ 85721"The quieter you become, the more you can
hear"*
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