@kelseyhusky I hate that shit... back in May I was doing some maintenance at one of our remote sites that required hands on.
Long story short.. NetEng thought they had the right link... but the internal port descriptors on this model cisco core router did not match up with the external numbering.
So we played link roulette for 2 hours, I pulled 6 10G fiber links before we gave up because nobody could figure out a way to map the bad link to a physical port.
@kelseyhusky I felt like shit during the 4 hour drive home. Eventually we opened a support ticket with cisco and had to apply 5 years of backlogged firmware updates to get status lights matching external ports so remote hands could do it.