[Ndn-interest] Interest Aggregation in PIT

Haowei Yuan hyuan at wustl.edu
Sat Dec 20 11:55:58 PST 2014

Hi Hussey,

In the current NFD implementation and also the previous versions, the
PIT performs Interest aggregation if the same Interest is requested
again. So there will be only one PIT entry if the daemon gets requests
from two different downstream routers for the same prefix.

Regarding your example, the PIT of C would look like the case on the
right hand side: "same entry with corresponding data".

If you are interested in the implementation details, more information
can be found in the NFD Developer’s Guide (Link:


On Tue, Dec 16, 2014 at 4:17 AM, clarke hussey <clarke.hussey1 at gmail.com> wrote:
> Hi all,
> If a ndncore daemon gets a request from two different downstream routers for
> the same prefix?
> How many entries storage wise will be there in the PIT according to the
> newly release implementation?
> A:-----> \parc.com\media----> C
> B:-----> \parc.com\media----> C
> So how does the pit of C looks now?
> Different Entries                     Same Entry with corresponding Data
> \parc.com\media:N1    F1        OR         \parc.com\media Nonce:N1,N2
> F1,F2
> \parc.com\media:N2    F2
> *N1, N2 are different nonces.
> *F1,F2 are different faces.
> Thanks for your time.
> Hussey.

More information about the Ndn-interest mailing list