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CCIE Practical Studies: Security (CCIE Self-Study) by Raymond Morrow, Andrew G. Mason, Dmitry Bokotey

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Configuring OSPF

Configuring OSPF can be a complex process. In a minimal configuration, you can configure an OSPF router with all the default parameter values, no authentication, and interfaces assigned to an area. However, if you decide to customize your OSPF environment, you have to ensure the configurations of your Area Border Routers (ABRs), which are routers connected to multiple areas, and Autonomous System Boundary Routers (ASBRs), which are routers running multiple routing protocols to connect an OSPF autonomous system to a non-OSPF autonomous system, are compatible.

OSPF external routes fall into two categories: external Type 1 and external Type 2. The difference between the two is the way the cost, or metric, of the route is calculated. ...

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