Example Of Root Path Determination - Hirschmann RS20 User Manual

Spanning Tree
4.3 Example of Root Path
Determination
The network plan
fig. 17) for defining the root path. The Administrator has defined a different
priority for for each bridge's bridge identifier. The bridge with the smallest
number for the bridge identifier will become the root bridge, in this case
bridge 1. In the example, all the sub-paths have the same path costs. The
path between bridge 2 and bridge 3 isblocked, because a connection from
bridge 3 to the root bridge via bridge 2 has a higher path cost.
The path from bridge 6 to the root bridge is interesting:
The path via bridge 5 and bridge 3 create the same root path costs as the
path via bridge 4 and bridge 2.
The path via bridge 4 is selected because the value 28,672 for its priority
in the bridge identifier is smaller than value 32,768.
However, there are also 2 paths between bridge 6 and bridge 4. The port
identifier is decisive here.
48
(see fig. 18) can be used to create the flow diagram
4.3 Example of Root Path Determina-
tion
(see
Redundancy
Release 6.0 07/2010