Mark Tinka wrote on 18/03/2020 17:02:
I prefer to have a number of core systems accessible in the IGP, because
BGP can sometimes get hosed for one reason or another.
BGP always needs IGP to work. The reverse is not true, and reduces us to
absolute basics when it hits the fan (which it has, a few times before).
Yeah. I was thinking more for the case of customer-facing anycast
resolvers, in which case BGP down means that the network is down, and if
the network is down it doesn't matter than DNS is also down because
their shared fate means that when BGP is back up, DNS will start working
again.
Nick
