Some of our users intermittently got disconnected from the network and then reconnected back automatically after a few seconds. We are using Cisco IP phones and the desktop PC is connected to the Cisco IP phone. The issue seems to be switch related but we don't know how to confirm or how to get to the error messages on the switch. We are using Cisco Catalyst 3560 series switch. Any help please.
Alright Danny. Your output just confirmed my suspicion. You have a definite cabling issue.
Pay close attention to Pair C and Pair D.
Firstly, Pair "C" controls your PoE. Notice the result? Do you see it's stating that it's "Failed" instead of "Normal"? Now look at the distance. It's longer than the standard of 100 metres.
Next, Paid "D" controls GigabitEthernet. Sure, the result is good that it's "Normal" but you WILL NOT get GigabitEthernet. You know why? Look at the distance. Again, it's stating that it's >100 metres.
So aside from potential cabling issue, what does this tell me? Look at the SIGNIFICANTLY large discrepancies between the cable distance of all four pairs. It's between 21 to >100 metres. I could go on-and-on here but what I'm suspecting you have is here is a sub-standard cabling from the patch panel (near your switch) to the remote end patch port (near your computer). Another thing could be that the patch panel (near the computer), around 20 or so metres away, is causing the discrepancy.
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...