It seems to me that for multicasting a similar
kind of semantic overloading is currently common.
As for the unicast world, I don't think such
semantic overloading is helpful.

It seems to me that relative to multicasting,
there are at least 2 different objects that
matter:

1) A Multicast Group Identifier, which is topology
   independent, and just gives a name for the group.

2) A Rendezvous Point useful for that Multicast Group.
   I imagine this is topology-dependent, and aggregatable,
   as it is naming the location of an RP (i.e. from the
   perspective of the unicast world).

Some folks might suggest that (2) is a kind of "Forwarding
Directive" or "Forwarding Hint", but it seems to me that
the thing really needed is the location of a RP for a
given destination multicast group.

Yours,

Ran

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