nanog mailing list archives
Re: Networks ignoring prepends?
From: William Herrin <bill () herrin us>
Date: Mon, 22 Jan 2024 13:26:33 -0800
On Mon, Jan 22, 2024 at 1:11 PM Andrew Hoyos <hoyosa () gmail com> wrote:
On Jan 22, 2024, at 14:35, William Herrin <bill () herrin us> wrote:The best path to me from Centurylink is: 3356 1299 20473 11875The path Centurylink chose is: 3356 47787 47787 47787 47787 53356 11875 11875 11875Do you want to tell me again how that's a reasonable path selection, or how I'm supposed to pass communities to either 20473 or 53356 which tell 3356 to behave itself?AS53356 (Free Range Cloud Hosting) appears to have some limited BGP communities that may help. https://docs.freerangecloud.com/en/bgp/communities implies that you sending 53356:19014 would block announcements to 47787.
At which point Centurylink chooses 40676 7489 11875 11875 11875 11875 11875 11875 11875.
This certainly seems like a reasonable path selection, in the context that 47787 is likely a 3356 customer.
That's -why- 3356 chooses the paths. 40676 and 47787 are customers, 1299 is a peer. You're telling me with a straight face that you think that's *reasonable* routing?
That may turn into a game of whack a mole, but the knobs appear to be there to try something other than prepending to influence 3356’s selection.
Whack-a-mole is not a reasonable solution to anything. Besides, I don't want to drop the path to 53356 via 47787. If the path through 20473 fails, the path through 53356 is the next best and I want Centurylink to use it. Regards, Bill Herrin -- William Herrin bill () herrin us https://bill.herrin.us/
Current thread:
- Re: Networks ignoring prepends?, (continued)
- Re: Networks ignoring prepends? James Jun (Jan 24)
- Re: Networks ignoring prepends? William Herrin (Jan 24)
- Re: Networks ignoring prepends? James Jun (Jan 24)
- Re: Networks ignoring prepends? William Herrin (Jan 24)
- Re: Networks ignoring prepends? James Jun (Jan 24)
- Re: Networks ignoring prepends? James Jun (Jan 22)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? Owen DeLong via NANOG (Jan 22)
- Re: Networks ignoring prepends? Tom Beecher (Jan 22)
- Re: Networks ignoring prepends? Andrew Hoyos (Jan 23)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? Nick Hilliard (Jan 22)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? James Jun (Jan 22)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? Alex Le Heux (Jan 23)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? Alex Le Heux (Jan 23)
- Re: Networks ignoring prepends? William Herrin (Jan 22)
- Re: Networks ignoring prepends? Tom Beecher (Jan 22)