Port mirror and EAP

[Max_Malpensa]

Hi,

I've configured an interface in this way:

display mirroring-group 1
mirroring-group 1:
   type: local
   status: active
   mirroring port:
       GigabitEthernet1/0/29  both
   monitor port: GigabitEthernet1/0/6

on interface GigabitEthernet1/0/6 I can see all the traffic coming in and out of the monitored interface (1/0/29) ,but I can't see part of the EAP traffic ... In particular I can see EAP traffic coming from pc connected to port 29 to the switch but I can't see the switch responses going back, I'm using an old network hub to accomplish the task and it worked fine.

Is it a known limit of port mirroring in comware ?