Miscellaneous OSPF Configuration Settings

These last few topics in the chapter discuss a few unrelated and optional OSPF configuration settings, namely how to make a router interface passive for OSPF, and how to originate and flood a default route using OSPF.

OSPF Passive Interfaces

ImagePassive Interfaces

Once OSPF has been enabled on an interface, the router tries to discover neighboring OSPF routers and form a neighbor relationship. To do so, the router sends OSPF Hello messages on a regular time interval (called the Hello interval). The router also listens for incoming Hello messages from potential neighbors.

Sometimes, a router does not need ...

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