[ndnSIM] behavior of consumer and provider

[yao hu]

Hi Alex,

Yes. I just wonder why does producer node need to forward the interest to
other node before or after it actually satisfies the interest, like in
SmartFlooding as you said. I will move on.

Thanks again for your explanation~

Regards,
huyao



2013/4/26 Alex Afanasyev <alexander.afanasyev at ucla.edu>

> Hi huyao,
>
> The forwarding strategy on producerNode doesn't really need to forward the
> interest to both faces, I was giving an example of what can happen.  Yes,
> with the existing ndn::Producer app, all interests will be satisfied, but
> in general (some other producer), may only have partial information.
>
> In any case, it is totally up to the strategy's decision of what to do
> with interest.  Ideally, the strategy should try available faces first (in
> some order), then learn from which face interests are getting satisfied
> (faster), and then primarily use this face to forward interest.  Do I
> suspect correctly that you're implementing something along these lines?
>
> ---
> Alex
>
> On Apr 25, 2013, at 8:31 PM, yao hu <huyao0107 at gmail.com> wrote:
>
> > Hi Alex,
> >
> > Thanks for your explanation. But I am still curious about why producer
> node needs to forward interest to NetDevice. Take the following simple
> topology for example.
> >
> >    (NetDeviceFace)                (NetDeviceFace)
> >  +--------+ /x         +--------------+ /x              +---------------+
> >  | client | ---------- | producerNode | --------------- | someOtherNode |
> >  +--------+            +--------------+                 +---------------+
> >                               | /x (AppFace)
> >                               |
> >                               |
> >                        +-------------+
> >                        | producerApp |
> >                        +-------------+
> >
> > If the producerNode received the interest (under the prefix /x), it will
> send the interest to AppFace (the interest will be satisfied). That is very
> reasonable. However, does it need to forward the interest to someOtherNode
> through NetDeviceFace. As you said, applications not always can satisfy all
> interest under specific prefix, but from my observance to the prior
> experiments (I made some change in CustomStrategy::DoPropagateInterest),
> producerNode can satisfy each node under /x and send Data packet back to
> client. Besides, it still have a chance (not every time, just in a small
> possibility) to forward the interest to someOtherNode. Is my observance
> wrong? Or what is the cause for the producerNode to forward interest (that
> will be satisfied to AppFace) to someOtherNode?
> >
> > Thanks very much~
> >
> > Regards,
> > huyao
> >
>
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