[ndnSIM] question about faceIterator in CustomStrategy

yao hu huyao0107 at gmail.com
Sat Mar 30 20:33:16 PDT 2013

Hi Alex,

I see. I forgot about it. Thanks for your explanation. I am sorry I have
one question about flooding strategy in ndnsim.

I saw your reply
http://www.lists.cs.ucla.edu/pipermail/ndnsim/2012-December/000030.html that
mentions how to flood to all available faces not listed in FIB. Now I
assume that when ndnsim simulation starts, I do not manually configure FIB
routes by AddRoute, that is, FIB on each node is empty, and let each node
forward the incoming interest to all available faces and don't want them to
add to FIB entries by the following

Ptr<L3Protocol> ndn = this->GetObject<L3Protocol> (); for (uint32_t faceNum
= 0; faceNum < ndn->GetNFaces (); faceNum++) { Ptr<Face> outFace =
ndn->GetFace (faceNum); TrySendOutInterest (inFace, outFace, header,
origPacket, pitEntry); }

However the interest will be not forwarded from any face and it seems no
interest packet is produced. What is wrong with it? Thanks a lot.


2013/3/31 Alex Afanasyev <alexander.afanasyev at ucla.edu>

> Hi huyao,
> The data structure that stores ordered Face instances in FIB behaves like
> any other STL container:
> begin ()  returns iterator to first element in the container
> end () returns a special iterator, indicating element just after the last
> valid element
> In other words, end () is never an iterator to a valid element in the
> container, and situations when begin () == end () means that the container
> has no elements.  If there is at least one element in the container, begin
> () will return iterator to a valid first element.
> ---
> Alex
> On Mar 30, 2013, at 8:20 AM, yao hu <huyao0107 at gmail.com> wrote:
> Hi Alex,
> Thanks for your reply to the previous question about ndnsim update.
> Now I am looking into the CustomStrategy::DoPropagateInterest. This
> function is to let Interest be forwarded to first two best-metric faces
> specified by FIB. However, in the codes, the faceIterator is first pointed
> to the beginning of faces ordered by metric and then checked whether it is
> pointed to the end of the faces. Assume that there is only one face
> existing in the associated faces for the fib entry. For my understanding,
> this face is located at the beginning of the faces and also should be
> located at the end of the faces. Then according to the DoPropagateInterest
> algorithm, the incoming interest will be not sent out though the fact is
> not like that for sure. So what is wrong with my understanding for the
> faceIterator? Or what is the internal structure of FacesByMetric &faces
> especially faces.begin () or faces.end()?
> I am sorry for my confusing expression. Thank you very much!
> Regards,
> huyao
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