I am working on doing upgrades from cisco 3850's to 9300's. Why do the SFP's (GLC-GE-100FX) that worked in the 3850 not work in my new 9300? Is there a command line I can use? Or is it just a firmware/hardware issue and new SFP's must be purchased?
Take a look at the matrix. You need 16.8.1 or later version of IOS-XE
You need ios XE 16.8.1 minimum on your C9300 to support SFP-GE-100FX
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