Configuration using Web Based Management and Command Line Interface   
4.5 The Switch menu 
  SCALANCE X-300 / X-400 
260  Configuration Manual, 10/2014, C79000-G8976-C187-22 
Loop Detection Port Configuration 
Make these specific settings from individual ports on this page. 
 
Figure 4-114  Loop Detection Port Configuration 
 
Note 
Test frames create additional network load. We recommend that you only configure 
individual switches, for example at branch points of the ring, as "Sender" and the others as 
"Forwarder".
 
This box shows the number of the selected port. 
Specify how the port handles loop detection frames. Select one of the following options from 
the drop-down list: 
●  Transmitter 
Loop detection frames are sent out and forwarded. 
●  Forwarder 
Loop detection frames from other devices are forwarded. 
●  Blocked 
The forwarding of loop detection frames is blocked.