OSPFv2 Configuration Examples

SWX (1) is an interior router in the backbone area.
Register the three networks connected to vlan1 to 3 as Area 0 using the network command.

SWX (2) is the ABR (Area Boarder Router) for the backbone area (Area 0) and NSSA (Area 2).
Register 172.16.2.0/24 connected to vlan1 as Area 0 using the network command.
Register 172.18.1.0/24 connected to vlan2 as Area 2 using the network command.
Register Area 2 as NSSA using the area command. At this point, specify default-information-originate to advertise the default route from SWX (2) to Area 2.

SWX (3) is an ABR (Area Boarder Router) for the backbone area (Area 0) and the standard area (Area 1).
Register 172.17.1.0/24 and 172.17.2.0/24 connected to vlan1 as Area 1 using the network command.
Register 172.16.1.0/24 connected to vlan2 as Area 0 using the network command.
To virtually make Area 4 adjacent to Area 0, create a virtual link using the area command.
Aggregate the two networks in Area 1 into 172.17.0.0/16 and advertise it to Area 0.
Aggregate the three networks in Area 0 into 172.16.0.0/16 and advertise it to Area 1.

SWX (4) is the ABR (Area Boarder Router) for the backbone area (Area 0) and the stub area (Area 3).
Register 172.16.3.0/24 connected to vlan1 as Area 0 using the network command.
Register 172.19.1.0/24 connected to vlan2 as Area 3 using the network command.
Register Area 3 as a stub area with the area command.

SWX (5) is the ASBR (Autonomous System Boarder Router) for NSSA (Area 2) and AS2.
Assume that RIP runs as a routing protocol other than OSPF within AS2, and that the networks 192.168.100.0/24 and 192.168.200.0/24 exist.

RIP-Related Settings
Register 192.168.100.0/24 and 192.168.200.0/24 as the management objects using the network command.
Also, advertises AS1’s OSPF network as a default route.

OSPF-Related Settings
Register 172.18.1.0/24 connected to vlan1 as Area 2 using the network command.
Register Area 2 as NSSA using the area command.
Advertise the route information obtained via RIP and the interface route information on the RIP side to the OSPF network.
Aggregate the route information for 192.168.100.0/24 and 192.168.200.0/24 obtained from RIP into 192.168.0.0/16 and advertise it to Area 2.
Prevent OSPF Hello messages from being sent from interfaces running RIP.

SWX (6) is the ASBR (Autonomous System Boarder Router) for the standard area (Area 1) and AS3.
Assume that RIP runs as a routing protocol other than OSPF within AS3, and that networks 10.0.0.0/24 and 10.0.1.0/24 exist.

RIP-Related Settings
Register 10.0.0.0/24 and 10.0.1.0/24 as the management objects using the network command.
Also, advertises AS1’s OSPF network as a default route.

OSPF-Related Settings
Register 172.17.1.0/24 and 172.17.2.0/24 connected to vlan1 as Area 1 using the network command.
Advertise the route information obtained via RIP and the interface route information on the RIP side to the OSPF network.
Aggregate the route information for 10.0.0.0/24 and 10.0.1.0/24 obtained from RIP into 10.0.0.0/16 and advertise it to Area 1.
Prevent OSPF Hello messages from being sent from interfaces running RIP.

SWX (7) is the ABR (Area Boarder Router) for the standard areas (Areas 1 and 4).
Register 172.17.1.0/24 and 172.17.2.0/24 connected to vlan1 as Area 1 using the network command.
Register 172.20.1.0/24 connected to vlan2 as area 4 using the network command.
To virtually make Area 4 adjacent to Area 0, create a virtual link using the area command.
Aggregate the two networks in Area 1 into 172.17.0.0/16 and advertise it to Area 0.