nanog mailing list archives
RE: Pitfalls of _accepting_ /24s
From: "Howard C. Berkowitz" <hcb () gettcomm com>
Date: Thu, 16 Oct 2003 21:01:11 -0400
A proposal was made some years ago, which I thought was by Tony Li, but, IIRC, he says it wasn't original with him. It does require cooperation from competitors, but can reduce the number of announcements. Under some circumstances, it may cause blackholing, but so can /24 filtering.
The idea is to establish bilateral blocks of provider space. Let us say Provider A and Provider B recognize that they have a significant number of common multihomed customers. Arbitrarily, one of the providers (assume A) starts off with a block -- let's say a /19 or /20 to which both providers will assign their multihomed customers. A and B peer and send more-specifics to each other.
To the outside world, however, A advertises its largest aggregate plus the multihomed block. B advertises this block of Provider A space as well as its own aggregates.
If A and B do not peer, the likelihood of blackholes become much higher since they may not see the more-specifics in the multihomed block.
Has anyone reexamined this proposal lately?
Current thread:
- Re: Pitfalls of annoucing /24s, (continued)
- Re: Pitfalls of annoucing /24s Phil Rosenthal (Oct 15)
- Re: Pitfalls of annoucing /24s Andy Ellifson (Oct 15)
- Re: Pitfalls of annoucing /24s K. Scott Bethke (Oct 15)
- Re: Pitfalls of annoucing /24s Phil Rosenthal (Oct 15)
- RE: Pitfalls of annoucing /24s Forrest (Oct 15)
- RE: Pitfalls of annoucing /24s H. Michael Smith, Jr. (Oct 15)
- RE: Pitfalls of annoucing /24s H. Michael Smith, Jr. (Oct 15)
- RE: Pitfalls of annoucing /24s Forrest (Oct 15)
- Re: Pitfalls of annoucing /24s Marshall Eubanks (Oct 18)
- Pitfalls of _accepting_ /24s jlewis (Oct 18)
- RE: Pitfalls of _accepting_ /24s Terry Baranski (Oct 18)
- RE: Pitfalls of _accepting_ /24s Howard C. Berkowitz (Oct 18)
- Re: Pitfalls of annoucing /24s Marshall Eubanks (Oct 18)
- Re: Pitfalls of annoucing /24s Brian Bruns (Oct 18)
- RE: Pitfalls of annoucing /24s Peter E. Fry (Oct 18)