Thanks for the suggestion, I have not heard of ProLabs, but have reached
out to them to see if they have fiber AOC cables compatible with Cisco and
Mellanox.
From what others have suggested, it does not seem like the problem can be
fixed with a configuration change on the Cisco switch, but rather just
finding a cable that will work with it. Seems odd to me that the Mellanox
cable works on a Cisco Nexus 3172 and not the 6004, but I guess that's how
it goes sometimes with optics.