Assumptions about network designs...
ankost at podolsk.ru
Tue Jul 12 13:10:33 UTC 2022
This is actually not the case. Cable service in some regional areas was
restored as late as on Monday and even in the same geographical area
there was a partial connectivity, so it looks less probable that network
could be overloaded only in some isolated segments longer than the rest
of the network and require manual intervention to fix it.
OTOH, overloading network core of such big network should be hardly
possible. Possible route "poisoning" could be isolated, so that it
doesn't affect the whole network cost to cost. It must be very unlucky
coincidence of such event to happen on such big scale. Maybe caused by
HW or SW bug.
I'm talking just about probabilities of different scenarios and trying
to compare them. So far, IMO provided version doesn't look very
sronan at ronan-online.com писал(а) 2022-07-11 20:18:
> I’m “guessing” based on all the services that were impacted the
> outage was likely cause by a change that caused a routing change in
> their multi-service network which overloaded many network devices, and
> by isolating the source the routes or traffic the rest of the network
> was able to recover.
> But just a guess.
More information about the NANOG