Pilz PSSnet SHL 8T MRP - Manual (Page 110)

Redundancy
110
6.3 Rapid Spanning Tree
PSSnet SHL - Web- based Interface
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
Hello Time The left column shows the value currently
being used by the root bridge. The device
periodically receives configuration frames
(Hello frames) from the root bridge. The
Hello Time shows the time between two
successive configuration frames sent by
the root bridge. If you configure the current
device as the root bridge, the other devic-
es in the entire network will assume the
value in the right column. 1 - 2 2
Forward Delay The left column shows the value currently
being used by the root bridge. The prede-
cessor protocol STP used the parameter
to control (delay) the transition time be-
tween the states „disabled“, „blocking“,
„learning“, ?„forwarding“. Since the intro-
duction of RSTP, this parameter has only
secondary relevance because state transi-
tions are negotiated between RSTP bridg-
es without a given time delay. If you
configure the current device as the root
bridge, the other devices in the entire net-
work will assume the value in the right col-
umn.
4 - 30 (see a:) 30
Max Age The left column shows the value currently
being used by the root Switch. Contrary to
the past (STP) meaning, Max Age now (for
RSTP) denotes the maximum permissible
branch length (number of devices to the
root bridge). If you configure the current
device as the root bridge, the other devic-
es in the entire network will assume the
value in the right column. 6 - 40 (see a:) 6
MAC Address The MAC address is combined with the
priority to make up the device's bridge
identification.
Topology
Changes This field displays the number of changes
since RSTP started.
Parameter Meaning Value range Default setting
Table 41: Global RSTP settings
a: Note the connection between the parameters Forward Delay and Max
Age - see below.