Pilz PSSnet SHL 8T MRP - Manual (Page 109)

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6.3 Rapid Spanning Tree
109
Parameter Meaning Value range Default setting
Operation Switch the RSTP function for this device
„On” or „Off”. If you disable RSTP globally
on a device, it will flood the RSTP frames
like normal multicast frames. The device
behaves transparently regarding RSTP
frames. On,
Off
MRP-Kompat-
ibilität MRP compatibility facilitates the use of
RSTP in a MRP-Ring and when coupling
RSTP segments to a MRP-Ring, on the
condition that all devices in the MRP-Ring
support the MRP compatibility.
If you combine RSTP with a MRP-Ring,
take care to configure the bridges in the
MRP-Ring with a better RSTP bridge prior-
ity than those in the connected RSTP net-
work. Thus you avoid connection
interruptions in case the devices in the
MRP-Ring detect a failure and shut down. On,
Off Off
Root
Information In every RSTP environment, there is a root
Switch that is responsible for controlling
the RSTP function.
The parameters of the current root Switch
are displayed here.
– Root Id: Displays the bridge identifier of
the root Switch. This is made up of the
priority value and the MAC address of the
device.
“This device is root”: A checkmark shows
that the device is currently the root Switch.
– Root Port: Displays the port that leads to
the root Switch. If you have configured the
device itself as the root Switch, 0.0 is dis-
played.
– Root Cost: Displays the root costs to the
root Switch. If you have configured the de-
vice itself as the root Switch, 0 is displayed
for the costs.
Priority The priority and MAC address together
make up the device's bridge identification.
The device with the lowest bridge identifi-
cation becomes the root device. Define the
root device by assigning the device the
lowest priority in the bridge identification
among all the devices in the network. Note
that only multiples of 4,096 can be entered
for this value. 0 < n*4,096 <
61,440
32,768
Table 41: Global RSTP settings
a: Note the connection between the parameters Forward Delay and Max
Age - see below.