Hirschmann RS20 Reference Manual page 174

Redundancy
condition (static topology), this information is identically to the designated
information.
If a port has no link, or if it has not received any STP-BDPUs for the
current MSTI, the device displays the values that the port would send as
a designated port.
Figure 46: Multiple Spanning Tree dialog, Port, CIST tab
Parameters Meaning
Tab „Guards" Protective settings for the ports.
Module.Port Port identification using module and port
numbers of the device, e.g. 2.1 for port one of
module two.
Table 111:Port-related STP settings and displays, guards
174
6.3 Spanning Tree
Possible values Default
setting
RM GUI L2E
Release 8.0 05/2013