D-Link DGS-3600 Series User Manual page 184

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:
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Figure 8- 25. Constructing a Shortest Path Tree
128.213.0.0
5
192.213.11.0
Figure 8- 26. Constructing a Shortest Path Tree
Router A
0
10
10
Router B
Router C
5
Router D
10
222.211.10.0
168
10