The two devices are connected via Ethernet. Figure 28-4 shows the IP address allocation
and connection of the equipment.
Figure 28-4 Example of configuring OSPF route summary
Requirements: 1) Both devices run the OSPF routing protocol. The 192.168.12.0/24 network
belongs to area 0, while the 172.16.1.0/24 and 172.16.2.0/24 networks belong to area 10; 2)
Router A is configured so that router A only advertises the 172.16.0.0/22 route, but not the
172.16.1.0/24 and 172.16.2.0/24.
Concrete Configuration of Devices
You need to configure the OSPF area route summary on Router A. Please note that the area
route summary can be configured only on the area border router.
Configuration of Device A:
#Configuring Ethernet interface
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
#Configure the two ports on the Ethernet card
interface FastEthernet1/0
ip address 172.16.1.1 255.255.255.0
interface FastEthernet1/1
ip address 172.16.2.1 255.255.255.0
#Configuring OSPF routing protocol
router ospf 1
network 192.168.12.0 0.0.0.255 area 0
network 172.16.1.0 0.0.0.255 area 10
network 172.16.2.0 0.0.0.255 area 10
area 10 range 172.16.0.0 255.255.252.0
Configuration of Device B:
#Configuring Ethernet interface
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
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