User Manual UMN:CLI
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8.3.14 Sample Configuration
Backup Route
When you design layer 2 network, you must consider backup route for stable STP
network. This is to prevent network corruption when just one additional path exits.
Fig. 8.27 Example of Layer 2 Network Design in RSTP Environment
In ordinary case, data packets go to Root switch A through the blue path. The black
arrows describe the routine path to the Aggregation Switch. And the dot lines are in
blocking state. But if there is a broken between Switch A and Switch B, the data from PC-
A should find another route at Switch D. Switch D can send the data to Switch C and
Switch E. Because Switch E has shorter hop count than Switch B, the data may go
through the Switch E and A as the red line. And we can assume Switch E is also failed at
the same time. In this case, since Switch D can has the other route to Switch C, the
network can be stable than just one backup route network.
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