> 'tis also very important to know the route taken for a net when
> analyzing the data. Discrepancies here can be huge and completely
> invalidate any conclusions you might make about how much traffic is
> traversing a given path.
For this we like combined interface stats; AS-based traffic matrices
are (from our point of view) mostly useful for end-to-end measurements.
Forgot to answer this one point...
Combined interface stats aren't very useful for a scenario we commonly
entertain: what will happen if I move Big Customer A's ingress to ANSnet
from ANS border router X to ANS border router Y? I need to know who
they're talking to in order to answer that question. Typically large
portions of the ANS mesh will be affected, and I need to know how.