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DES-7200 Configuration Guide Chapter 10 MSTP Configuration
10-6
Figure-5
If the active path between Switch A and Switch B fails, the backup path will work.
Consequently, the network topology is generated as shown in Figure 6.
Figure-6
If the path between Switch B and Switch C fails, Switch C will automatically
switch the alternate port to the root port. Consequently, the network topology is
generated as shown in Figure 7.