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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-44
OSPF ABR/ASBR configuration example
As shown above, device A and device B are intra-area routers; device C is an
area border router; device D is a AS boundary router. 200.200.1.0/24 and
172.200.1.0/24 are network segments outside the OSPF routing domain. All
OSPF devices shall be able to learn external routes after configuration. External
routes shall type 1 routes carry "34" tag.
Detailed configurations
While OSPF redistributes routes from other sources, it will by default redistribute
type-II routes carrying no tag.
Configurations on Device A:
# Configure Ethernet interface
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
# Configure OSPF routing protocol
router ospf 1
network 192.168.12.0 0.0.0.255 area 0
Configurations on device B:
# Configure Ethernet interface
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
# Configure WAN interface
interface Serial 1/0
ip address 192.168.23.2 255.255.255.0
# Configure OSPF routing protocol
router ospf 1
network 192.168.12.0 0.0.0.255 area 0
network 192.168.23.0 0.0.0.255 area 0
Configurations on device C:
# Configure Ethernet interface
interface FastEthernet 0/0
ip address 192.168.34.3 255.255.255.0
# Configure WAN interface
interface Serial 1/0
ip address 192.168.23.3 255.255.255.0