Building the OSPF LSDB and Creating IP Routes

Link-state protocols build IP routes with a couple of major steps. First, the routers build a detailed database of information about the network and flood that so that all routers have a copy of the same information. (The information is much more detailed than the topology data collected by EIGRP.) That database, called the link-state database (LSDB), gives each router the equivalent of a roadmap for the network, showing all routers, all router interfaces, all links between routers, and all subnets connected to routers. Second, each router runs a complex mathematical formula (the details of which we can all ignore) to calculate the best route to reach each subnet.

The next few pages walk through both ...

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