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 http://k7ve.org/blog http://twitter.com/#!/john_hays http://www.facebook.com/john.d.hays
On Fri, Mar 16, 2012 at 11:10, Tim Pozar pozar@lns.com wrote:
(Please trim inclusions from previous messages) _______________________________________________ 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