Isn't this due to the fact their engineering scale is bigger? There's little
point connecting to an IX fabric if you want to peer with 3 others and all of
those at 10G. The assumption that big carriers don't join IXs because they're
somehow unreliable or toy-like doesn't seem fair.
the only stuff that makes me feel at all safe is what mike hughes
of linx described, or something even stricter, but i bow to mike's
and folk wonder why the grown-ups use pnis for anything important.