Why do I believe its the IOS? Because thats when they stopped working. The switch is a C9300-48S-E. It was upgraded to IOS XE 17.9.4a. We have other media converters that were still working so we thought that maybe the network gods fried 14 media converters of the same model at the exact same time lol. So we bought replacements and surprise, the new ones don't work. I plugged them into a different switch and they linked up. Before you jump to any possible configurations, we wiped the switch running 17.9.4a and still nothing. I then plugged it into the exact same model running 17.03.05 and it worked. Any ideas?
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? ' When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
Poor choice of words. It killed the link. No errors reported on the switch. It just cant link up. It doesnt even try. Initial symptoms would suggest a layer 1 issue, but those variables have been eliminated.
Unfortunately, I can’t roll it back. STIGs say I can’t. I would test it out if I had a spare, but I don’t. The media converters are 10/100/1000Base-T to 1000Base-SX which connects to a 1000Base-SX SFP. The transition and black box MCs have the same specs and work just fine. The model i'm troubleshooting is ADD-GMCP-SX
