R1#
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
ip address 100.100.100.1 255.255.255.255
!
interface Loopback2
ip address 100.100.100.2 255.255.255.255
!
interface Loopback3
ip address 100.100.100.3 255.255.255.255
!
interface Loopback4
ip address 100.100.100.4 255.255.255.255
!
interface Loopback5
ip address 100.100.100.5 255.255.255.255
!
interface Loopback6
ip address 100.100.100.6 255.255.255.255
!
interface Loopback7
ip address 100.100.100.7 255.255.255.255
!
interface FastEthernet0/0
ip address 12.12.12.1 255.255.255.0
!
router eigrp 1
network 100.100.100.4 0.0.0.0
network 100.100.100.5 0.0.0.0
network 100.100.100.6 0.0.0.0
network 100.100.100.7 0.0.0.0
auto-summary
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
redistribute eigrp 1 subnets
network 1.1.1.1 0.0.0.0 area 0
network 12.12.12.1 0.0.0.0 area 0
network 100.100.100.1 0.0.0.0 area 100
network 100.100.100.2 0.0.0.0 area 100
network 100.100.100.3 0.0.0.0 area 100
R2#
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 12.12.12.2 255.255.255.0
!
interface Serial0/0
ip address 23.23.23.2 255.255.255.0
clock rate 2000000
!
router ospf 2
router-id 2.2.2.2
log-adjacency-changes
network 2.2.2.2 0.0.0.0 area 1
network 12.12.12.2 0.0.0.0 area 0
network 23.23.23.2 0.0.0.0 area 1
R3#
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Serial0/0
ip address 23.23.23.3 255.255.255.0
!
router ospf 3
router-id 3.3.3.3
log-adjacency-changes
network 3.3.3.3 0.0.0.0 area 1
network 23.23.23.3 0.0.0.0 area 1
Check routing table in R3
R3(config-router)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/75] via 23.23.23.2, 00:04:57, Serial0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/65] via 23.23.23.2, 00:04:57, Serial0/0
100.0.0.0/32 is subnetted, 7 subnets
O E2 100.100.100.4 [110/20] via 23.23.23.2, 00:04:57, Serial0/0
O E2 100.100.100.5 [110/20] via 23.23.23.2, 00:04:57, Serial0/0
O E2 100.100.100.6 [110/20] via 23.23.23.2, 00:04:57, Serial0/0
O E2 100.100.100.7 [110/20] via 23.23.23.2, 00:04:57, Serial0/0
O IA 100.100.100.1 [110/75] via 23.23.23.2, 00:04:58, Serial0/0
O IA 100.100.100.2 [110/75] via 23.23.23.2, 00:04:58, Serial0/0
O IA 100.100.100.3 [110/75] via 23.23.23.2, 00:04:58, Serial0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.23.23.0 is directly connected, Serial0/0
12.0.0.0/24 is subnetted, 1 subnets
O IA 12.12.12.0 [110/74] via 23.23.23.2, 00:05:03, Serial0/0
Now check OSPF database in R3. We can LSA that advertise in R3
R3(config-router)#do sh ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 3)
Router Link States (Area 1) -----------------> LSA Type 1
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 352 0x80000004 0x009846 3
3.3.3.3 3.3.3.3 351 0x80000002 0x00BB1D 3
Summary Net Link States (Area 1) -----------------> LSA Type 3
Link ID ADV Router Age Seq# Checksum
1.1.1.1 2.2.2.2 527 0x80000001 0x008D98
12.12.12.0 2.2.2.2 527 0x80000001 0x00FF07
100.100.100.1 2.2.2.2 527 0x80000001 0x009368
100.100.100.2 2.2.2.2 527 0x80000001 0x008971
100.100.100.3 2.2.2.2 527 0x80000001 0x007F7A
Summary ASB Link States (Area 1) -----------------> LSA Type 4
Link ID ADV Router Age Seq# Checksum
1.1.1.1 2.2.2.2 527 0x80000001 0x0075B0
Type-5 AS External Link States -----------------> LSA Type 5
Link ID ADV Router Age Seq# Checksum Tag
100.100.100.4 1.1.1.1 720 0x80000001 0x0083E7 0
100.100.100.5 1.1.1.1 708 0x80000001 0x0079F0 0
100.100.100.6 1.1.1.1 696 0x80000001 0x006FF9 0
100.100.100.7 1.1.1.1 678 0x80000001 0x006503 0
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