Complete loss of all network!!!
Just had a complete loss of all network due to what looked like a loopback at first. Looked at our DES-6500 stack and we had 100% utilization so proceeded to unplug each fibre plug one by one until we found out what room was the problem.
Reset our router and with that room unplugged everything else worked fine.
After investigation in that room we couldn't find any loopbacks or any obvious problems.
Connected it back up and reset all the computers and the switch in that room and now everything works fine.
Could be a problem with that module in the DES-6500 because one of the link lights wasn't lighting up when plugged into a particular port but worked on another port.
Any ideas anyone?
Dead network card in one of the machines ?
Long shot but could be a dead NIC in one of the machines ?