[outages] Optus/Akamai

[Gert Doering]

Hi,

On Wed, Nov 08, 2023 at 03:25:13PM -0600, Aaron Wendel via Outages wrote:
> That makes no sense.  How would tripping the max prefix on a single peer cause
> a major outage?

If you have

  client --> border router -> route reflector -> all other BGP speakers

and the "RR -> BGP speakers" sessions get tripped due to "client sending
in too many new routes", then your whole network will fall apart until
you can shutdown that initial BGP session (or re-provision the other
sessions, which might not work due to "there is no connectivity to
the management systems, because, BGP is down").

*Iff* this happens, and you do not have working OOB access including
being able to do local config changes on the routers ("all configs are
done by the automatization, no local access possible"), such a problem will
be extremely messy to recover.  Especially figuring out *what* happened,
if you have no visibility because the routers have lost the route to your
syslog servers....

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de