Sat Oct 17, 2020 11:48 pm
We've had this problem on 3 different Netonix switches - the mini, 8 port DC, and 12 port DC. All of them are older than 1.5.5, some dating back to 1.4.7, and all of them began exhibiting this behavior several months after upgrading them from 1.5.2 to 1.5.5 late last year.
After several months of operation on 1.5.5 with no problems, these switches had some ports that simply locked up and stopped passing traffic while other ports continued functioning just fine. The POE on the affected ports continued powering the attached radios, but there was simply no traffic moving through the affected port(s). This also happened on one of the SFP ports on the 12 port DC the same way. A hard power cycling of the switches had no effect - they powered back up in the same crippled state.
After bringing all 3 switches back to the lab and downgrading the firmware to 1.5.2 they all began working normally again - like nothing had happened. All 3 of the switches were put back into service with 1.5.2 and have been functioning for many months now without any further issue.
We use VLANs and port isolation on all of our switches, but none of those configuration settings were common among the ports that stopped working. The only common factor we could identify was the 1.5.5 firmware.
EDIT - I just rememberd we also had this issue happen on a 4th switch - the 12 port AC switch. Only on this switch it was a single port, and that port kept dropping from gig/full to 100/Full. Running a cable diagnostic on that port returned no errors and the port would then revert to gig/full for about 10-20 seconds before again dropping to 100/full. After downgrading that switch from 1.5.5 to 1.5.2 the port went to gig/full and has stayed steady there for months now.