By the way, there are many words of caution that apply to auto-sub-
delegation of prefixes. In general, one
wants them to aggregate in a nice way without all the issues of
renumbering. That means in part that there must
be some way to recognize when it is inappropriate to use the
algorithm, such as saying that it is appropriate
to networks using PA prefixes and in which internal aggregation is
not
in use. If my upstream gives me a /60,
there isn't a lot to discuss. If the upstream gives a /56 or a /48
and
the site in question has multiple
campuses, auto-sub-delegation is probably pretty difficult to get
right.
Perhaps what we need here is a default algorithm for auto-sub-
delegation
that produces reasonable results in common cases with a manual
override
so that if you don't like the results, you can always do it yourself.
- Wes