HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 664

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring OSPF
13-50
In the example configuration commands, note that the network commands
enable OSPF on the /20 subnets on which the ABR interfaces reside. The area
<area ID> range commands, on the other hand, specify the range of four /
20 subnets that belong to each area. A range of four subnets subtracts two
from the original prefix length of 20, for 18 bits. The corresponding subnet
mask is 255.255.192.0
To configure ABR A in Figure 13-12, you would enter the following commands
from the OSPF configuration mode context:
ProCurve(config-ospf)# network 172.16.16.0 0.0.15.255 area 0
ProCurve(config-ospf)# network 172.16.64.0 0.0.15.255 area 1
ProCurve(config-ospf)# network 172.16.128.0 0.0.15.255 area 2
ProCurve(config-ospf)# network 172.16.192.0 0.0.15.255 area 3
ProCurve(config-ospf)# area 1 stub
ProCurve(config-ospf)# area 2 stub no-summary
ProCurve(config-ospf)# area 3 stub
ProCurve(config-ospf)# area 0 range 172.16.0.0 255.255.192.0
ProCurve(config-ospf)# area 1 range 172.16.64.0 255.255.192.0
ProCurve(config-ospf)# area 2 range 172.16.128.0 255.255.192.0
ProCurve(config-ospf)# area 3 range 172.16.192.0 255.255.192.0
ABR A's interfaces would have the IP addresses shown in Figure 13-13.
!
interface eth 0/1
ip address 172.16.16.1 255.255.240.0
!
interface fr 1.101 point-to-point
ip address 172.16.64.2 255.255.240.0
!
interface fr 1.102 point-to-point
ip address 172.16.128.2 255.255.240.0
!
interface fr 1.103 point-to-point
ip address 172.16.192.2 255.255.240.0
Figure 13-13. IP Addresses of Router A's Interfaces