Hirschmann RS20 Programming Manual page 89

Rapid Spanning Tree
If two paths with the same root path costs lead out from a bridge, the port
identifier is used as the last criterion
is selected.
Determine root path
Equal
path costs?
yes
Equal
priority in
bridge identification?
yes
Equal
port priority?
yes
Figure 46: Flow diagram for specifying the root path
Redundanz L2P
Release 5.0 04/09
6.2 Rules for creating the tree structure
(see fig.
no
Path with lowest
path costs = root path
Path with highest
no
priority in bridge
identification = root path
Path with highest
no
port priority
= root path
Path with lowest
port number
= root path
45). This decides which port
Root path determined
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