Chapter 5: Multiarea OSPF 

Commands:

5.3.2 Configuring OSPF route summarization

Router(config-router)# area area-id range address mask
Router(config-router)# summary-address address mask

5.4.3 Configuring stub and totally stubby areas

Router(config-router)# area area-id stub [no-summary]
Router(config-router)# area area-id default-cost cost

5.5.2  Configuring virtual links

Router(config-router)# area area-id virtual-link router-id

5.6.3 Configuring NSSA

Router(config-router)#area area-id nssa [no-summary]
Router(config-router)#summary-address prefix mask [not-advertise] [tag tag]

 

5.7.1 Verifying multiarea OSPF operation

Router# show ip ospf border-routers
Router# show ip ospf virtual-links
Router# show ip ospf process-id
Router# show ip ospf database