On Wed, Aug 29, 2001 at 07:12:19PM +0200, Iljitsch van Beijnum wrote:
Sorry for the late reply.
On Fri, 24 Aug 2001, Randy Bush wrote:
the /24s of small multihomers is half the routing table (see geoff's data)
This can't possibly be correct. The last figure I read was that there are about 70k /24s. There are about 21k AS numbers out there. This means that by far most of the announcements, including /24s, are the result of lack of CIDR. Either because ISPs have a relatively large number of PA blocks (address conservation) or because of lack of aggregation.
Small multihomer /24s aren't necessarily their own. I've dealt with plenty of customers multihoming with a /24 from their other provider without running BGP. No extra AS number, but the /24 still shows up in the global table. Also seen customers with their own /24, but having us originate it rather than doing BGP with them. -c