Hirschmann RS20 Reference Manual page 166

Redundancy
Parameter Meaning
s
Hello Time Sets the Hello Time.
The local Hello Time is the time in
seconds between the sending of two
configuration messages (Hello packets).
If the local device has the root function, the
other devices in the entire network take
over this value. Otherwise the local device
uses the value of the root bridge in the
"Root" column on the right.
Forward Sets the Forward Delay parameter.
Delay In the previous STP protocol, the Forward
Delay parameter was used to delay the
status change between the statuses
disabled, discarding, learning,
forwarding. Since the introduction of
RSTP, this parameter has a subordinate
role, because the RSTP bridges negotiate
the status change without any specified
delay.
If the local device is the root, the other
devices in the entire network take over this
value. Otherwise the local device uses the
value of the root bridge in the "Root"
column on the right.
Max Age Sets the Max Age parameter.
In the previous STP protocol, the Max Age
parameter was used to specify the validity
of STP BPDUs in seconds. For RSTP,
Max Age signifies the maximum
permissible branch length (number of
devices to the root bridge).
If the local device is the root, the other
devices in the entire network take over this
value. Otherwise the local device uses the
value of the root bridge in the "Root"
column on the right.
Tx Hold Sets the Hx Hold Count parameter.
Count If the device sends a BPDU, it increments
a counter at this port. When the counter
reaches the value of the Tx Hold Count,
the port stops sending any more BPDUs.
The counter is decremented by 1 every
second. The device sends a maximum of
1 new BPDU in the following second.
Table 105:Global Spanning Tree settings, local bridge parameters
166
6.3 Spanning Tree
Possible values Default setting
1 - 2 2
4 - 30 s 15 s
See the note
following this table.
6 - 40 s 20 s
See the note
following this table.
1 - 40 10
(based on RSTP
standard: 1 - 10)
RM GUI L2E
Release 8.0 05/2013