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Chapter 1. Planning for Complex Networks > Building the Routing Table
Building the Routing Table
The router builds a routing table by ruling out invalid routes and considering the remaining advertisements. The procedure is
1. | For each route received, verify the next hop. If invalid, discard the route. |
2. | If multiple identical, valid routes are received by a routing protocol, choose the lowest metric. |
3. | Routes are identical if they advertise the same prefix and mask, so 192.168.0.0/16 and 192.168.0.0/24 are separate paths and are each placed into the routing table. |
4. | If more than one specific valid route is advertised by different routing protocols, choose the path with the lowest AD. |
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