On Thu, Oct 08, 1998 at 04:19:08AM +1200, Donald Neal wrote:
Problems in getting small allocations advertised have
for years. Are we actually at the stage where we're seeing
international carriers refuse to advertise anything, say, below a
Stating the obvious - lots of small non-aggregated routes mean
backbone and gateway routers have to use more memory and work much
harder... well, actually only a little bit harder, memory utilization
is usually O(N), and search time O(log n) or worse.
Requiring people don't advertise lots of small piddly routes (by
refusing to accept them) with the outside world is a good way to deal
Right now. the distribution of routing prefix sizes (from skewed my
view of the world) is roughly as follows:
LHS is frequency, RHS is prefix size. So there are 30126 /24 routes,
6026 /16 routes, etc.
This comes from `bgpdump | sed "s:\([^/]\+\)/\([0-9]\+\).*:\2:" |
| sort | uniq -c | sort -nur' for those who are curious.
Getting back to your question; I believe most of the US will accept
down to /24 but other parts of the world often insist upon no smaller
than /20 or /19. (Joe - can you clarify that?)
It would be interesting to know just how much of a difference it
would make if people were not able to advertise anything smaller
than, say, /21.
To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz
where the body of your message reads: