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A comment on CenturyLink 911 outage was caused by a single network card sending bad packets. Parent comment

Re:CenturyLink 911 outage was caused by a single network car... by insaneirish on Monday December 31, 2018 @08:30AM (#18794391)
Ensuring all layer 2 domains are loop free by design and moving all redundancy to layer 3 and routing protocols.
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Re:CenturyLink 911 outage was caused by a single network car... by oarsinsync on Wednesday January 02, 2019 @03:00AM (#18804852)
> Ensuring all layer 2 domains are loop free by design

Impossible, unfortunately, or we wouldn't need STP.

> and moving all redundancy to layer 3 and routing protocols.

Not always possible either, sadly. Works well for new deployments, can difficult to retrofit into older deployments depending on the scale and applications involved.

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