Hi, just to comment on two points: On Sat, May 04, 2002 at 12:36:02PM -0700, Michel Py wrote:
neither are "use a /48 from each of the upstreams"
Why not? All of the upstreams is probably overkill, but from three or four big ones?
For optimum routing, and neutrality, at least in the case of the RIPE NCC (and maybe some of the IXes service networks), you want all upstreams (90) to reach their network directly, not going over other peers. So you either take 90 /48s, or take one, and announce that to all the peers/ upstreams (which is mostly the same in these situations). [..]
Allowing people to leak specific prefixes in the DFZ is pretty darn close to giving them their own. ISPs will not filter because they don't want to risk losing revenue, end-sites will not allocate resources to clean what's not broken on their end (the DFZ's routing table). Exactly the same mess situation we have with v4. Once a /48 leaks into the DFZ and is used for revenue-generating production, would you explain us what are you going to do to take it away?
There is a huuuuuuuge difference to "the same mess we have with v4". Today I cannot filter v4 more-specifics without loosing major amounts of network connectivity, due to the fact that so much of the crap is PI from swamp space. If you do PA more-specific leaking, everybody else is free to decide whether they want to accept this or not. Maybe this specific customer you are talking about is interested in my network having "good" connectivity to his specific revenue-generating /48, and not going over "bad" aggregate connectivity - so he is free to send some money over to have me open my filters. *I* certainly won't loose revenue if I don't accept lots of more-specifics from the US or APNIC networks (if I filtered their PI, then I would loose). I can very well imagine a scenario where ISPs are willing to accept more-specifics *in their own (RIR) region*, and filtering out those from other regions. Except for global players (that can't say "this is my region" because they're present everywhere) this would result in near-perfect connectivity to all networks, while not being forced to take all the crap. It all centers around "announcing something is costing everybody else", of course. My approach makes this "... if those do not like the cost, they do not have to, but if they don't mind, their routing might be better". Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 45077 (47584) SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299