One has to wonder how many places are using the prepend-me-harder
commands to do traffic engineering, and have absolutely no clue that
their prepends are having the opposite effect because the prefix is
being dropped entirely by some AS's.
I dunno. There was a bug with AS lengths or something not that far back. Didn't effect any of my stuff, but just to be safe I added it to all my routers. I don't know where I came up with the magical 75 number, but it definitely seems reasonable that anything with 75+ ASNs in the path probably don't deserve to be in my table.
Jack