nanog mailing list archives
Re: Smaller than a /24 for BGP?
From: "Forrest Christian (List Account)" <lists () packetflux com>
Date: Tue, 24 Jan 2023 20:12:47 -0800
I have two thoughts in relation to this: 1) It's amazing how many threads end up ending in the (correct) summary that making an even minor global change to the way the internet works and/or is configured to enable some potentially useful feature isn't likely to happen. 2) I'd really like to be able to tag a BGP announcement with "only use this announcement as an absolute last resort" so I don't have to break my prefixes in half in those cases where I have a backup path that needs to only be used as a last resort. (Today each prefix I have to do this with results in 3 prefixes in the table where one would do). And yes. I know #2 is precluded from actually ever happening because of #1. The irony is not lost on me. On Tue, Jan 24, 2023, 7:54 PM John Levine <johnl () iecc com> wrote:
It appears that Chris J. Ruschmann <chris () scsalaska net> said:-=-=-=-=-=- How do you plan on getting rid of all the filters that don’t acceptanything less than a /24?In all seriousness If I have these, I’d imagine everyone else does too.Right. Since the Internet has no settlements, there is no way to persuade a network of whom you are not a customer to accept your announcements if they don't want to, and even for the largest networks, that is 99% of the other networks in the world. So no, they're not going to accept your /25 no matter how deeply you believe that they should. I'm kind of surprised that we haven't seen pushback against sloppily disaggregated announcements. It is my impression that the route table would be appreciably smaller if a few networks combined adjacent a bunch of /24's into larger blocks. R's, John
Current thread:
- Smaller than a /24 for BGP? Justin Wilson (Lists) (Jan 24)
- Re: Smaller than a /24 for BGP? Ian Chilton (Jan 24)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 24)
- Re: Smaller than a /24 for BGP? Jon Lewis (Jan 24)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 24)
- Re: Smaller than a /24 for BGP? Jon Lewis (Jan 24)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 24)
- Re: Smaller than a /24 for BGP? Jon Lewis (Jan 24)
- RE: Smaller than a /24 for BGP? Robert McKay (Jan 24)
- Re: Smaller than a /24 for BGP? John Levine (Jan 24)
- Re: Smaller than a /24 for BGP? Forrest Christian (List Account) (Jan 24)
- Re: Smaller than a /24 for BGP? Lars Prehn (Jan 25)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 27)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Donald Eastlake (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 29)