Facebook post-mortems...

Tue Oct 5 12:53:32 UTC 2021

On 05/10/2021 13:17, Hauke Lampe 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
> 

Thanks for sharing that article.  But OOB access involves exactly that - 
Out Of Band - meaning one doesn't depend on any infrastructure prefixes 
or DFZ announced prefixes.  OOB access is usually via a local ADSL or 
wireless modem connected to the BFR.  The article does not discuss OOB 
at all.

Regards,
Hank