Example Of Manipulating The Tree Structure - Hirschmann RS20 Programming Manual

Rapid Spanning Tree
6.5 Example of manipulating the
tree structure
The Management Administrator soon discovers that this configuration with
bridge 1 as the root bridge
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
between the individual bridges and the root bridge are now shorter.
P-BID = 40 960 P-BID = 20 480
Bridge 7 Bridge 4
Priority of the bridge identifikation (BID)
P-BID
= BID without MAC Address
Root path
Interrupted path
Figure 49: Example of manipulating the tree structure
94

6.5 Example of manipulating the tree structure

(see on page 90 „Example of specifying the root
P-BID = 16 384
Bridge 2
Port 2
Port 1
P-BID = 36 864
Port 3
Bridge 6
(see fig. 49). The distances
P-BID = 24 576 P-BID = 32 768
Bridge 3 Bridge 1
P-BID = 28 672
Bridge 5
Redundanz L2P
Release 5.0 04/09