Although this topic is already some years old, I hope someone can provide me the latest status for this issue. We are currently also facing this issue with a i2600. Tmsh list net interface displayes "Unsupported Optic detected" and interface status for 5.0 and 6.0 is DOWN. If I check all above comments it seems it's working for some of you and for others not. I also tried to verify if there is any possibility to disable the vendor-check, but I can't find anything useful. And more useful information would be very helpful! Thank you!