My speculative guess would be that OOB access to a few outbound-facing
routers per DC does not help much if a configuration error withdraws the
infrastructure prefixes down to the rack level while dedicated OOB to
each RSW would be prohibitive.

If your OOB has any dependence on the inband side, it's not OOB.

It's not complicated to have a completely independent OOB infra , even at scale.

On Tue, Oct 5, 2021 at 8:40 AM Hauke Lampe <lampe@hauke-lampe.de> wrote:

On 05.10.21 07:22, Hank Nussbacher wrote:

> Thanks for the posting. How come they couldn't access their routers via
> their OOB access?

My speculative guess would be that OOB access to a few outbound-facing
routers per DC does not help much if a configuration error withdraws the
infrastructure prefixes down to the rack level while dedicated OOB to
each RSW would be prohibitive.

https://research.fb.com/wp-content/uploads/2021/03/Running-BGP-in-Data-Centers-at-Scale_final.pdf