Hi, On Tue, Oct 09, 2001 at 04:02:08PM +0300, Vladimir A. Jakovenko wrote:
1. Routes with more than one origin.
No - the more specifics are announced by the customer AS *only* (and the upstream AS that this blocks belongs to will permit them "through").
We are talking about different types of multihoming. I mean simple multihoming situation when all multihomed customer's needs in routing are covered by they upstream providers routing policies. In this situation more specific PA route can be originated by upstreams without allocation to customer new AS-num. Moreover, according to ripe-185:
In order to help decrease global routing complexity, a new AS Number should be created only if a new routing policy is required.
I didn't realize this, but I agree with Randy on this: without their own AS number (and with them doing the BGP origination stuff and so on), this isn't going to work anyway - if they do not want to do BGP, then they should multi-home to the *same* ISP. [..]
- if one is filtering "no /24's", the end site is *still* be reachable, which would not work with PI space.
Disagree. During last time a number of routing curioses at least in our country have been caused by incorect announcements or filtering more specific routes within already announced less specific routes. If you want, I can describe some of the most common problems. PI addresses have its own set of problems, more specific PA addresses also have own set problems. This sets partly overlaps, but not same. And PA more specific isn't safer than PI. They just unsafe a bit more different.
They will be much safer when people start filtering out "long prefixes". Which will happen *soon*. Gert Doering -- NetMaster -- SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299