OSPF Area Range for Border Routers

TASKS:
1. Configure IP Addresses as per diagram
2. Configure 5 subnet of 20.0.0.0/8 as loopback addresses in R3
3. Look into routing table inter-area routes
4. Configure Area Range command on R2 and see change in Routing table of R1. Area range command summarizes range and only work on Border Routers.
5. See Results by using Show ip route; show ip protocols
6. Dubug ip ospf adj and Debug ip ospf events

---

! R1 Configuration

hostname R1 !

interface Serial0/0

ip address 1.1.1.1 255.255.255.252

no shut

!

interface Serial0/1

ip address 2.2.2.1 255.255.255.252

no shut

!

router ospf 1

network 1.1.1.0 0.0.0.3 area 0

network 2.2.2.0 0.0.0.3 area 10


! R2 Configuration
hostname R2


interface Serial0/0

ip address 1.1.1.2 255.255.255.252

no shut

!

interface Serial0/1

ip address 3.3.3.1 255.255.255.252

no shut

!

router ospf 1

area 20 range 20.1.1.0 255.255.255.0

network 1.1.1.0 0.0.0.3 area 0

network 3.3.3.0 0.0.0.3 area 20

! R3 Configuration

hostname R3


interface Loopback0

ip address 20.1.1.1 255.255.255.255

interface Loopback1

ip address 20.1.1.2 255.255.255.255

interface Loopback2

ip address 20.1.1.3 255.255.255.255

interface Loopback3

ip address 20.1.1.4 255.255.255.255

interface Loopback4

ip address 20.1.1.5 255.255.255.255

!

interface Serial0/0

ip address 3.3.3.2 255.255.255.252

no shut

!

router ospf 1

network 3.3.3.0 0.0.0.3 area 20

network 20.1.1.1 0.0.0.0 area 20

network 20.1.1.2 0.0.0.0 area 20

network 20.1.1.3 0.0.0.0 area 20

network 20.1.1.4 0.0.0.0 area 20

network 20.1.1.5 0.0.0.0 area 20


! R4 Configuration
hostname R4


interface Serial0/0

ip address 2.2.2.2 255.255.255.252

no shut

!

router ospf 1

network 2.2.2.0 0.0.0.3 area 10