[ns] Hierarchical addressing and mcast

["B. Scott Michel" <scottm@CS.UCLA.EDU>]

I've searched through the archives, and I'm still banging my head against my
desk. I have a feeling this a documentation issue, but here goes anyway:

(a) Hiearchical addressing and dense-mode multicast cannot, will not, and
never will work together.

(b) Hierarchical addressing and shared-tree multicast do coexist, but
specifying this multicast protocol must be done AFTER all of the agents are
attached to their nodes and their dst_addr_ is set to the desired multicast
group.

I'm hoping those two statements are true. If they are, the documentation on
how to use ns needs to be updated. It is NOT obvious from the mcast examples
that DM is incompatible with hiearchical addressing. It is also NOT obvious
that SM needs to be turned no AFTER agents are linked to their nodes.

I haven't bothered with centralised multicast or BST.


-scooter