IOS version might be why you can't run the command. When I did this it was on a Cisco C9300-48T switch running IOS 16.9.4 with Uplink Module C9300-NM-2Y 2x25G
Good afternoon,I used the "speed nonegotiate" command on the involved interfaces on the C9300 switch. That resolved the issue and the interfaces connected. I also had some 10/25 Gig SFPs that weren't working. I found they required on the C9300 the "s...
I think you need to configure the tw1/1/2 interface with the command “speed no negotiation” You may need to configure you port channel interface with this command as well.
