nanog mailing list archives
Re: DNS pulling BGP routes?
From: William Herrin <bill () herrin us>
Date: Thu, 7 Oct 2021 10:01:51 -0700
On Thu, Oct 7, 2021 at 9:52 AM Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote:
But, this time, the reality strikes back.
Not really. Or at all. Facebook the external service was down hard as soon as the cross-datacenter connections all failed. Whether or not the BGP routes for the external DNS were withdrawn had no impact on the outage. Facebook's _internal_ DNS, while not anycasted, followed a similar logic: if the data center is isolated and their data goes stale, they stop serving potentially wrong answers. Since the routing failure isolated all of the data centers, this left no usable _INTERNAL_ DNS on which more or less everything else depends. I didn't work for the DNS team when I worked as a production engineer for Facebook but I worked close enough to understand what happened from the posted description. Regards, Bill Herrin -- William Herrin bill () herrin us https://bill.herrin.us/
Current thread:
- Re: DNS pulling BGP routes?, (continued)
- Re: DNS pulling BGP routes? Blake Dunlap (Oct 06)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 06)
- Re: DNS pulling BGP routes? William Herrin (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 07)
- Re: DNS pulling BGP routes? Tom Beecher (Oct 07)
- Re: DNS pulling BGP routes? Bjørn Mork (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 07)
- Re: DNS pulling BGP routes? William Herrin (Oct 07)
- Re: DNS pulling BGP routes? Mark Tinka (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 07)
- Re: DNS pulling BGP routes? William Herrin (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 07)
- Re: DNS pulling BGP routes? William Herrin (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 07)
- Re: DNS pulling BGP routes? Sabri Berisha (Oct 07)
- Re: DNS pulling BGP routes? Mark Tinka (Oct 07)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 08)
- Re: DNS pulling BGP routes? Tom Beecher (Oct 08)
- Re: DNS pulling BGP routes? Carsten Bormann (Oct 08)
- Re: DNS pulling BGP routes? William Herrin (Oct 08)
- Re: DNS pulling BGP routes? Masataka Ohta (Oct 08)