DNS pulling BGP routes?

Thu Oct 7 04:58:58 UTC 2021

On 10/7/21 00:22, Michael Thomas wrote:

>
> But it wasn't just their DNS subnets that were pulled, I thought. I'm 
> obviously really confused. Anycast to a DNS server makes sense that 
> they'd pull out if they couldn't contact the backend. But I thought 
> that almost all of their routes to the backend were pulled? That is, 
> the DFZ was emptied of FB routes.

During the outage, we kept serving traffic to Facebook in various 
locations. So it would seem that while a large amount of their NLRI left 
the DFZ, it wasn't all of them.

However, what was left was not sufficient to actually keep typical 
services up, including their DNS.

Mark.