Pilz PSSnet SHL 8T MRP - Manual (Page 65)

Rapid Spanning Tree
PSSnet SHL - Redundancy Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
4.5 Example of manipulating the tree
structure
65
4.5 Example of manipulating the
tree structure
The Management Administrator soon discovers that this configuration with
bridge 1 as the root bridge
(see on page 61 „Example of specifying the root
paths“) is unfavorable. On the paths from bridge 1 to bridge 2 and bridge 1 to
bridge 3, the control packets which the root bridge sends to all other bridges
are adding up.
If the Management Administrator makes bridge 2 the root bridge, the burden
of the control packets on the subnetworks is distributed much more evenly.
The result is the configuration shown here
(see fig. 34) . The distances
between the individual bridges and the root bridge are now shorter.
Figure 34: Example of manipulating the tree structure
Bridge 5
P-BID = 28 672
Bridge 7
P-BID = 40 960 P-BID = 20 480
Bridge 3
P-BID = 24 576
Bridge 1
P-BID = 32 768
Bridge 2
P-BID = 16 384
P-BID = 36 864
Bridge 6
Port 3
Bridge 4
Port 1
Port 2
Root path
Interrupted path
P-BID Priority of the bridge identifikation (BID)
= BID without MAC Address