Hirschmann RS20 Reference Manual page 117

Link Trap
This object determines whether or not to send a trap when link status
changes. The factory default is enabled.
Flow
Indicates if enable flow control is enabled on this port.
Device Status
Indicates whether or not the given port's link status is monitored by
the device status.
CLI L2B
Release 4.0 11/07
4.5 Device Configuration Commands
117