Le ven 22/10/2004 à 17:01, Michael H. Lambert a écrit :
Given that the "best path" probably just has meaning for a given
application between given hosts at a given point in time, how often do
we *really* need the *best* path?
The goal is not much to have the *best* path, but to avoid really bad
paths.
Best effort usually works well enough for forwarding--why shouldn't it
do the same for path selection? (I think Noel implied this in his
response--to use his highway analogy: in driving from Boston to San
Francisco saving six hours is good, saving ten minutes is (usually)
irrelevant?)
Since the One True Best Path is likely unknowable anyway, why
complicate path selection by building SVCs (or MPLS tunnels) into it?
In the multi-address multi6 case, path selection is simply done by
selecting the right source and destination prefixes. If a host can
figure out which are the couples (src,dst) prefixes to avoid, then the
benefit can be huge. This doesn't require tunnels in any ways.