Hirschmann MACH 1040 Series, User Manual

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Spanning Tree
62
4.6 The Rapid Spanning Tree
Protocol
Redundancy
Release 6.0 07/2010
Parameter Meaning Possible Values Default Setting
Priority The priority and the MAC address go
together to make up the bridge
identification. 0 < n*4,096 < 61,440 32,768
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 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.
1 - 2 2
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 only 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.
4 - 30 s
See the note following
this table. 15 s
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.
6 - 40 s
See the note following
this table. 20 s
Table 8: Global RSTP settings