No, the trunk port must be OOS to change the wavelength. And if you have the circuits provisioned as OCHCC, you probably have to delete the circuits and trail since these are all logically provisioned to a given wavelength. And you'll probably need to delete and rebuild internal patchcords, which requires that no circuits/trails are provisioned to the port.
If you only have an OCHNC, you should be a little better off, but in this case, you wouldn't have provisioned circuits or internal patchcords anyway.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...