I upgraded some uplinks from 1G to 10G and was having issues with getting the link up. Realized that the C3850 brought down its port when the 1G SFP was swapped with the 10G and nothing would bring it back up besides inserting the original 1G.
Also during my troubleshooting, I swapped out a 10G SFP on a C9300 for a 1G SFP and that also brought the port hard down, shut no shut and reloads do not bring it up.
The only solution to this problem is to put the faster (or different) speed SFP into a totally unused port.
How do you use the same port with a different speed SFP?
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