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I have 2 Cisco switches, a 2950 and a 2960. When the Siemens CP443-1 PLC is connected to the 2950 communication is successful. When logging into the Cisco IOS I detect 2 siemens mac address on one cisco port, one for the PLC and one for the network card. When I connect the PLC to the 2960 communication is not successful. I only detect the PLC mac address not the network card. I was on with Cisco support for more 2 hours examining the switch but nothing seems to be wrong. I installed the newest Cisco IOS and I'm running out of ideas. Has anyone run into this?