[ndnSIM] （无主题）

[xyhu]

Hi Alex,

Sorry to bother you again.
I found that in ForwardingStrategy::OnInterest(),
you first check PIT (and get a PIT entry for the Interest anyway) and then CS, which is
different from the description in Van's NDN paper.
But if there is the matching data in CS, it is unnecessary to create a PIT entry for this
Interest, right?
So I am curious about that you may have special meaning for processing incoming
interests in this way. Do you?

Thanks,
Xiaoyan