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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
192.128.11.0
128.213.0.0
222.211.10.0
Router A
Router B
Router C
Router D
Figure 5-22. Constructing a Shortest Path Tree
Router A
Router B
Router C
Router D
128.213.0.0
192.213.11.0
222.211.10.0
0
10
10
5
5
10
10
Figure 5-23. Constructing a Shortest Path Tree
The diagram above shows the network from the viewpoint of Router A. Router A can reach
192.213.11.0 through Router B with a cost of 10+5=15. Router A can reach 222.211.10.0 through
Router C with a cost of 10+10=20. Router A can also reach 222.211.10.0 through Router B and Router
D with a cost of 10+5+10=25, but the cost is higher than the route through Router C. This higher-cost
route will not be included in the Router A’s shortest path tree. The resulting tree will look like this:
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