[ndnSIM] Satisfy Interests with more than one producer

[Yusung Kim]

Hi Alex and ndnSIM community.

When using ndnSIM,  is there the same function of the implicit digest to
get specific content ?
( the implicit digest is used in CCNx, right ? )

In the your example topology,
Does Consumer need to select one producer  between Producer1 and Producer2
  using the implicit digest ?

Thanks,

- Yusung Kim -



On Mon, Apr 1, 2013 at 4:11 AM, Alex Afanasyev <alexander.afanasyev at ucla.edu
> wrote:

> Hi Amin,
>
> Let me clarify a little bit with a small example:
>
> Consumer --- Router ----- Producer1
>                |
>                +--------- Producer2
>
> Assuming ns3::ndn::fw::Flooding strategy, Interests from the Consumer will
> reach both Producer1 and Producer2, and they both will send back a content
> object packet.
>
> Router, receiving the first packet (depending on the topology, could be
> from Producer1 or Producer2) will forward it to the consumer and remove*
> the PIT entry.  When the second content object arrives to the Router (not
> the consumer), it will be discarded by the router, as unsolicited.   (I
> would not call this as a drop, since it is relatively high-level decision
> to not forward the specific packet.)
>
> * PIT entry can be immediately removed (by default), or scheduled for
> removal within a short time interval (PitEntryPruningTimout).  In either
> case, an extra content object will be discarded.
>
> ---
> Alex
>
> On Mar 31, 2013, at 12:02 PM, Amin Karami <amin at ac.upc.edu> wrote:
>
>  In case of ns3::ndn::fw::Flooding, we will have several drops. Because
> when a consumer receives desired content from first sender/producer,
> consumer will drop other same contents. Yes? because the desired Interest
> has been satisfied and removed from PIT.
>
>
> /Amin
>
>
>
> On 03/31/2013 08:42 ب.ظ, Alex Afanasyev wrote:
>
> Hi Amin,
>
>  I is possible, but it depends on the forwarding strategy to deliver
> Interests to different producers.  For example, if you choose
> ns3::ndn::fw::BestRoute, then Interests will only be delivered over the
> "shortest-metric" path and some of the producers will never see the
> Interests.   If you use ns3::ndn::fw::Flooding, then all of the producers
> will receive Interests and it would depend on network topology
> (delays/losses) content object from which exactly producer will reach the
> consumer.
>
>  In case if you have several consumers, depending on topology and
> forwarding strategy, they may be getting content objects from different
> producers.
>
>  If you want only some Interests be satisfied by one producers and other
> by another, you may need to amend ndn::Producer implementation (or better
> create a new custom Producer app) by adding the appropriate logic.
>
>  ---
> Alex
>
>  On Mar 31, 2013, at 11:35 AM, Amin Karami <amin at ac.upc.edu> wrote:
>
>  Hi friends,
> Is it possible to satisfy sent Interests from a consumer with more than
> one producer?
> for example, does the following code work correctly to satisfy Interests
> in /dst1 namespace with three producers?
>
>   ndnGlobalRoutingHelper.AddOrigins ("/dst1", producer1);  producerHelper.SetPrefix ("/dst1");  producerHelper.Install (producer1);   ndnGlobalRoutingHelper.AddOrigins ("/dst1", producer2);  producerHelper.SetPrefix ("/dst1");  producerHelper.Install (producer2);
>   ndnGlobalRoutingHelper.AddOrigins ("/dst1", producer3);  producerHelper.SetPrefix ("/dst1");  producerHelper.Install (producer3);
>
>
> Best Regards,
> /Amin
>
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>
>
>
>
> --
>
>
> Best Regards,
>
> =======================================================
> Amin Karami, PhD student in Computer Architecture Department (DAC) at
> the Universitat Politècnica de Catalunya Barcelona Tech (UPC)
>
> e-mail:  amin at ac.upc.edu | UPC-Campus Nord., Office: C6-E102
> phone: +34 93 40 11 638 | Jordi Girona, 1-3
>                                             | 08034 Barcelona - SPAIN
> WWW:  http://personals.ac.upc.edu/amin/
> =======================================================
>
>
>
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