I work as a junior network admin at an ISP and I would like your help in resolving an issue whose cause is not readily apparent. Rn I am trying to troubleshoot a case where a switch interface randomly goes down for about 3-5 and then right back up. It is a poe switch and the connected device is a wireless point to point antenna getting power from the switch itself.
- switch interface goes down
- switch interface goes back up and connectivity resumes as normal
- autonegotiation sometimes results in 100mbit full duplex but is mostly 1gbit full duplex
Now the problem can be one of many things: nic of the point to point antenna, cable, switch interface, the switch itself (correct if I'm wrong and please add other possible causes). Is there a way I can tell which of the above is to blame without having to physically go to the location and start changing stuff? What errors should I be looking for in each case? Obviously, an on-site inspection might be of help but it is not certain and requires people
For the record, I have looked at the statistics provided by the switch but the only errors I get in this case are fifo errors which increment when the interface autonegotiates to 100mbit and cannot support all traffic passing through it. But that is expected. I have not gone into much detail about the specific equipment used because I would like a more general approach.