[ndnSIM] PIT Entry implementation in ndnSIM

Alex Afanasyev alexander.afanasyev at ucla.edu
Thu Sep 5 21:12:22 PDT 2013

Hi James, 

I'm not quite sure what exactly you're referring in the second second paragraph of ccnx.  First of all, PIT entry's lifetime is updated (suppose to be updated) in ndnSIM and it does not contradict from what I read in the linked doc.
Second, CCNx protocol specification is just one interpretation of what Named Data Networking is or should be.  The whole purpose of the ndnSIM is to understand the architecture itself, to play with different parameters, etc., including PIT entry lifetime.


On Sep 5, 2013, at 6:35 AM, James A A <james.siit at gmail.com> wrote:

> Hi Alex,
> I looked at how PIT entry is implemented in ndnSIM. I observed that the lifetime of a PIT entry for a given interest is updated every time subsequent interests for the same data arrive at a node (router) before the entry lifetime expires. The node is still waiting to receive the data. I obtained this information, in addition to other sources, from simulation run on ndnSIM when I used NS_LOG=ndn.pit.Entry. Please clarify this.
> Is ndnSIM based on CCNx documentation? If yes, please see https://www.ccnx.org/releases/ccnx-0.8.0/doc/technical/CCNxProtocol.html under CCNx Node Model ==> Pending Interest Table (PIT), and Strategy Rules ==> 2nd paragraph.
> Regards,
> James
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