Siemens SCALANCE X-300 Configuration Manual page 197

(Rapid) Spanning Tree, media redundancy and passive listening
You have the following options to connect an (R)STP segment to an MRP or HRP ring:
● using (R)STP to one device in the ring
You can enable (R)STP at the same time as the media redundancy methods MRP or
HRP on different ports of a device (see figure
redundancy").
A connection to several devices of a ring using (R)STP is not possible. Since the (R)STP
BPDUs are not forwarded via an MRP or HRP ring, this results in circulating frames and
the failure of the data traffic (compare
redundancy").
● using passive listening on various devices in the ring
If you want to link an (R)STP segment to various devices of a MRP or HRP ring, you will
need to enable passive listening on all devices of the ring and disable (R)STP. Since
passive listening supports the forwarding of (R)STP BPDUs, there are no circulating
frames.
Note
(R)STP and passive listening cannot be enabled at the same time on an IE switch.
SCALANCE X-300 / X-400
Configuration Manual, 10/2014, C79000-G8976-C187-22
Configuration using Web Based Management and Command Line Interface
①
Permitted (R)STP connection to ring redun-
dancy
①
"Permitted (R)STP connection to ring
②
"Impermissible (R)STP connection to ring
②
Impermissible (R)STP connection to ring
redundancy
4.5 The Switch menu
197