D-Link DES-3326SRM Product Manual - Page 169
Router
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D-Link DES-3326S Layer 3 Switch Router A 128.213.0.0 0 10 10 5 192.213.11.0 Router B 5 Router D 10 Router C 10 222.211.10.0 Figure 23- 2. 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: Router A 128.213.0.0 0 10 10 Router B Router C 5 10 192.213.11.0 222.211.10.0 Figure 23- 3. Constructing a Shortest Path Tree - Completed Note that this shortest path tree is only from the viewpoint of Router A. The cost of the link from Router B to Router A, for instance is not important to constructing Router A's shortest path tree, but is very important when Router B is constructing its shortest path tree. Note also that directly connected networks are reached at a cost of 0, while other networks are reached at the cost calculated in the shortest path tree. Router A can now build its routing table using the network addresses and costs calculated in building the above shortest path tree. 159