I think managing proper use of the address space (e.g. use for ham radio) is better facilitated by having fewer BGP advertisements.  E.g. if we only allow /16 network BGP advertisements we only add 256 entries.  All other subnets under the /16 can be tunneled -- if you have a bad actor, simply revoke their tunnel.

In most cases, I think, a smaller subnet advert is probably more of a "vanity" thing, than a network need.

John D. Hays
K7VE
PO Box 1223, Edmonds, WA 98020-1223 
  



On Fri, Mar 16, 2012 at 11:10, Tim Pozar <pozar@lns.com> wrote:
(Please trim inclusions from previous messages)
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I have yet to find anything that is doing core BGP peering that is not CIDR capable.  The main reason for not doing anything less than a /24 is lack of memory and not filling up the route table with a zillion prefixes.  Sprint started this in the early days.  I find that few if any peers enforce this of late as you can see a bunch of prefixes that are less than a /24 being announced.  Check out routeviews.org to see.

That being said, in order to be good neighbors out there and follow conventions, we should not be announcing anything less than a /24.

Tim