I got a network switch that is showing zero activity across about a dozen ports, the most important of which is the feed from the router from upstairs. This happened out of nowhere and I don’t think it’s the switch unless the backup I tried is also bad. I also tested the cable leading from the router and it passes the continuity test at the very least. Even if that line was dead, wouldn’t the switch show at least SOME activity as devices try to access each other? I’m no IT master, but peer to peer still happens in a network, doesn’t it? Anyway, it’s been a few days of trying to fix this myself, so I finally turn to reddit. Any ideas, lads?
Check that the RJ45 is seated correctly in the port on the router. I mention this, cause this is the “are you freaken kiddding me?” Scenario, that you could spend hours troubleshooting.
Next, plug a computer/laptop into that port. Verify it’s working. Then? Test the cable run by the switch. Make sure you can get connection at the switch side.
If all that passes, all these tests, just assume your router hates your taste in switches.