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The oddest part was that FFC recommendations didn’t include “limit the size of your broadcast domain”.

Large flat L2 are a classic time bomb, with their builders proudly exclaiming “look ma, no hands!” until they painfully get reminded of their mistake :)

I worked for a regional isp where almost the entire metro network was a single layer 2 network up to the point of presences. We regularly (as in at least once a week) had spanning tree loops and broadcast storms that took down the entire city.

Is there a source or is that a guess at what happened? That sounds immensely incompetent to the point that I find it hard to believe

In this particular case, some insider info and I am also in possession of the RFO CenturyLink sent out for a number of downed 10GbE transport circuits. From they way they described it a broadcast storm between infinera node controllers propagated uncontrollably across their entire infinera chassis fleet in the western US.

I know some of these words.