[ndnSIM] Satisfy Interests with more than one producer

[Alex Afanasyev]

Hi Yusung,

No, ndnSIM (as of right now) does not have a concept of the implicit digest.  Ideally, each individual piece of content should have a unique name.  If you really want to distinguish between data produced by Producer1 and Producer2, why not explicitly name these two data pieces differently?  Alternatively, you can explicitly add a digest component to the name.

---
Alex

On Mar 31, 2013, at 7:50 PM, Yusung Kim <yskim525 at gmail.com> wrote:

> 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
>>>> 
>>>> _______________________________________________
>>>> ndnSIM mailing list
>>>> ndnSIM at lists.cs.ucla.edu
>>>> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>>> 
>> 
>> 
>> -- 
>> 
>> 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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