Hi, On Tue, Jun 22, 2004 at 12:23:50PM +0100, Sascha Luck wrote:
On Tuesday 22 June 2004 07:45, Gert Doering wrote:
As of today, "more-specific BGP multihoming" works. So he *can* set his own routing policy.
It's certainly a work-around if all else fails. I'm not sure it should be *encouraged* though, since announcing more-specific routes flies in the face of aggregation.
Having more-specifics for multihomed (and only those!) customers doesn't mean the rest of the block must be deaggregated. The impact on the routing table is, at worst, the same as in "you get your own prefix and announce that world-wide". At best, the customer might eventually cease to be multihomed, and the more-specific goes away.
Besides don't most people filter on allocation boundaries?
Most people don't filter at all. Of those that do, some filter on allocations, and some permit up to /48s. Which doesn't break anything in that model - the aggregate is there, so packets travel in the right direction. "Near to the network in question", chances are high that more-specifics *are* visible, and thus the packets can reach their destination. Nobody can *guarantee* anything anyway. Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 60210 (58081) SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299