In order to communicate Siemens TIA Portal and a S-1200 PLC, i have to connect both to the same swicht, but i can't do that. The S-1200 is generating LLDP traffic but it can't reach the PC whit Siemens software, the EX2200 is blocking it. I configure a ge-0/0/12.0 as port mirror and monitor the ingress traffric from the PLC is connected. I can see the LLDP traffic. But it doesn't reach the PC.
You need to remove the LLDP on the EX switch for the ports these devices are connected to.
If LLDP is on for these interface the EX will consume and process the LLDP request itself and NOT flood the request.