Network topologies and media redundancy 
  1.8 Spanning tree, media redundancy and passive listening 
SCALANCE X-200 
Configuration Manual, 03/2015, C79000-G8976-C285-06 
27 
 
Spanning tree, media redundancy and passive listening 
If you want to link an STP segment to various devices of an MRP or HRP ring, you will need 
to enable passive listening on all devices of the ring 
①. Since passive listening supports the 
forwarding of STP BPDUs, there are no circulating frames. 
 
① Permitted connection of an STP segment to a 
ring 
② Incorrect connection of an STP segment to a 
ring