Open Shortest Path First (OSPF) is an interior gateway, link-state routing protocol.
OSPF routers exchange information about the state of the links in the network, and this information is entered into the topology database.
The Shortest Path First (SPF) algorithm is then run on the contents of the topology or link state database to build the routing table.
Basic OSPF configuration involves enabling an OSPF routing process on a router and specifying a range of IP addresses associated with the routing process along with the corresponding area ID.
To configure an OSPF routing process, issue the router ospf command in global configuration mode.
To define the interfaces on which OSPF runs and to define the area ID for those interfaces, issue the network area command in router configuration mode.
Depending on the topology, additional configuration, such as explicitly defining neighbors and controlling Designated Router (DR) and Backup Designated Router (BDR), might be necessary.
For additional information on basic OSPF configuration and other OSPF configuration options refer to:
For information on how to design and deploy OSPF in large networks refer to the:
OSPF Design Guide
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