BSCI Exam Cram™ 2 (Exam 642-801)

Configuring and Verifying a Multi-Area OSPF Network

A router becomes an ABR or ASBR according to the types of areas to which it is connected. The first step to configure OSPF on the router is to enable the OSPF routing protocol process and then designate the IP networks on the router that are members of the OSPF network, like so:

RouterA(config)# router ospf
					process-id
RouterA(config-router)# network
					address wildcard-mask
					area
					area-id
				

If your router is connected to another non-OSPF network, you need to configure it as an ASBR and properly place it on the routing protocol network to which you are distributing routes. We will explore route distribution in greater detail in Chapters 9, “Scaling BGP Networks,” and 10, “Optimizing Routing Updates ...