today we are having a very weird problem
We have 2 UTP (roughly around 60meters each) connecting between 2 ciena 3930 and we use LACP (etherchannel) to bond them together. We have running this running for years, today suddenly the link went down. We login to ciena and get the log, we found lacpMuxSm with event PartUnSync. I have attached the log as well.
This problem is very weird because the 2 ciena is identical and we have checked there's no problem with the UTP cable.
Does anyone know what's the issue?