Pilz PSSnet SHL 8T MRP - Manual (Page 60)

Rapid Spanning Tree
60
4.2 Rules for creating the tree structu-
re
PSSnet SHL - Redundancy Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
X If two paths with the same root path costs lead out from a bridge, the port
identifier is used as the last criterion
(see fig. 30) . This decides which port
is selected.
Figure 31: Flow diagram for specifying the root path
Equal
path costs?
Determine root path
no
yes
Equal
priority in
bridge identification?
Equal
port priority?
yes
yes
Path with lowest
path costs = root path
Path with highest
port priority
= root path
Path with highest
priority in bridge
identification = root path
no
no
Path with lowest
port number
= root path
Root path determined