Hirschmann RS20 User Manual page 81

Spanning Tree
Parameter Meaning
Priority The priority and the MAC address go
together to make up the bridge
identification.
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 Delay Sets the Forward Delay parameter.
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.
Table 13: Global RSTP settings
UM Redundancy Configuration L2E
Release 7.1 12/2011
5.6 The Rapid Spanning Tree
Possible Values
0 < n*4,096 (1000H) <
61,440 (F000H)
1 - 2
4 - 30 s
See the note following
this table.
6 - 40 s
See the note following
this table.
Protocol
Default Setting
32,768 (8000H)
2
15 s
20 s
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