Cisco OSPF protocol

Single-region OSPF

Router (config) # router ospf 1 starts the OSPF routing process

Router (config-router) # router-id 1.1.1.1 configure the Router ID

Router (config-router) # network 1.0.0.0 0.20.255.255 area 0 specifies the interface and region in which the OSPF protocol runs

Multi-region OSPF

Router (config) # router ospf 1

Router (config-router) # router-id 1.1.1.1

Router (config-router) # network 1.0.0.0 0.20.255.255 area 0

Router (config-router) # network 2.0.0.0 0.20.255.255 area 1

Peripheral Area

Router (config) # area1 stub

Complete peripheral area

Router (config) # area1 stub no-summary

Route redistribution

Router rip

Redistribute ospf 10 metric 10

Router ospf 10

Redistribute rip metric 10 subnets

NSSA Region

Router (config) # area1 nssa

Virtual Link

Router (config) # area 100 virtual-link 1.1.1.1 peer RID

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