OSPF Virtual Links and Area Summarization

R1#sho ip int bri

Interface IP-Address OK? Method Status Protocol

Serial0/0 10.1.12.1 YES manual up down

Loopback1 10.1.1.1 YES manual up up

Loopback30 172.30.30.1 YES manual up up

R2(config)#int lo2

R2(config-if)#ip add 10.1.2.1 255.255.255.0

R2(config-if)#exit

R2(config)#int s0/0

R2(config-if)#ip add 10.1.12.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#exit

R2(config)#int s0/1

R2(config-if)#ip add 10.1.23.2 255.255.255.0

R2(config-if)#no shut

R3(config)#int s0/0

R3(config-if)#ip add 10.1.23.3 255.255.255.0

R3(config-if)#no shut

R3(config-if)#exit

R3(config)#int lo3

R3(config-if)#ip add 10.1.3.1 255.255.255.0

R3(config-if)#exit

R3(config)#int lo100

R3(config-if)#ip add 192.168.100.1 255.255.255.0

R3(config-if)#int lo101

R3(config-if)#ip add 192.168.101.1 255.255.255.0

R3(config-if)#exit

R3(config)#int lo102

R3(config-if)#ip add 192.168.102.1 255.255.255.0

R3(config-if)#exit

R3(config)#int lo103

R3(config-if)#ip add 192.168.103.1 255.255.255.0

R3(config-if)#end

Step 2 Add interface into OSPF

R1(config)#router ospf 1

R1(config-router)#net 10.1.12.0 0.0.0.255 a 0

R1(config-router)#net 10.1.1.0 0.0.0.255 a 0

R1(config-router)#exit

R1(config)#int loopback 1

R1(config-if)#ip ospf network point-to-point

R2(config)#router ospf 1

R2(config-router)#net 10.1.2.0 0.0.0.255 a 0

R2(config-router)#net 10.1.23.0 0.0.0.255 a 23

R2(config-router)#net 10.1.12.0 0.0.0.255 a 0

R2(config-router)#exit

R2(config)#int lo2

R2(config-if)#ip ospf network point-to-point

R2(config-if)#exit

R3(config)#router ospf 1

R3(config-router)#net 10.1.23.0 0.0.0.255 a 23

R3(config-router)#net 10.1.3.0 0.0.0.255 a 23

R3(config-router)#exit

R3(config)#int lo3

R3(config-if)#ip ospf network point-to-point

R3(config-if)#exit

Step 3. Create a virtual link

R2(config)#router ospf 1

R2(config-router)#area 23 virtual-link 192.168.103.1

R3(config)#router ospf 1

R3(config-router)#net 192.168.100.0 0.0.0.255 a 100

R3(config-router)#exit

R3(config)#int loopback 100

R3(config-if)#ip ospf network point-to-point

R3(config-if)#exit

R3(config)#int lo101

R3(config-if)#ip ospf network point-to-point

R3(config-if)#exi

R3(config)#int lo102

R3(config-if)#ip ospf network point-to-point

R3(config-if)#exi

R3(config)#int lo103

R3(config-if)#ip ospf network point-to-point

R3(config-if)#exit

R3(config)#router ospf 1

R3(config-router)#area 23 virtual-link 10.1.2.1

Step4.summarize an area

R3(config)#router ospf 1

R3(config-router)#area 100 range 192.168.100.0 255.255.255.0

Step5.Generate a default route into OSPF.

R3(config)#router ospf 1

R3(config-router)#default-information originate always

To Verify

Show ip ospf database

Show ip route

Show ip ospf interface

Show ip ospf neibour

Show ip ospf

R1#sho ip ospf database

OSPF Router with ID (172.30.30.1) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.1.2.1 10.1.2.1 577 0x80000005 0x0024DF 4

172.30.30.1 172.30.30.1 1229 0x80000004 0x000A69 3

192.168.103.1 192.168.103.1 2 (DNA) 0x80000003 0x00A96C 1

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

10.1.3.0 10.1.2.1 1086 0x80000001 0x00EFEF

10.1.3.0 192.168.103.1 7 (DNA) 0x80000001 0x00FD5E

10.1.23.0 10.1.2.1 1237 0x80000001 0x0009C3

10.1.23.0 192.168.103.1 7 (DNA) 0x80000001 0x00996F

192.168.100.0 192.168.103.1 7 (DNA) 0x80000001 0x00ABF0

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

192.168.103.1 10.1.2.1 468 0x80000001 0x005AC1

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

0.0.0.0 192.168.103.1 475 0x80000001 0x00558B 1

R1#sho ip route

Gateway of last resort is 10.1.12.2 to network 0.0.0.0

172.30.0.0/30 is subnetted, 1 subnets

C 172.30.30.0 is directly connected, Loopback30

10.0.0.0/24 is subnetted, 5 subnets

C 10.1.12.0 is directly connected, Serial0/0

O IA 10.1.3.0 [110/129] via 10.1.12.2, 00:08:34, Serial0/0

O 10.1.2.0 [110/65] via 10.1.12.2, 00:08:34, Serial0/0

C 10.1.1.0 is directly connected, Loopback1

O IA 10.1.23.0 [110/128] via 10.1.12.2, 00:08:34, Serial0/0

O IA 192.168.100.0/24 [110/129] via 10.1.12.2, 00:08:34, Serial0/0

O*E2 0.0.0.0/0 [110/1] via 10.1.12.2, 00:08:26, Serial0/0

R1#sho ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.1.2.1 0 FULL/ - 00:00:30 10.1.12.2 Serial0/0

R2#sho ip ospf database

OSPF Router with ID (10.1.2.1) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.1.2.1 10.1.2.1 736 0x80000005 0x0024DF 4

172.30.30.1 172.30.30.1 1390 0x80000004 0x000A69 3

192.168.103.1 192.168.103.1 1 (DNA) 0x80000003 0x00A96C 1

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

10.1.3.0 10.1.2.1 1245 0x80000001 0x00EFEF

10.1.3.0 192.168.103.1 6 (DNA) 0x80000001 0x00FD5E

10.1.23.0 10.1.2.1 1396 0x80000001 0x0009C3

10.1.23.0 192.168.103.1 6 (DNA) 0x80000001 0x00996F

192.168.100.0 192.168.103.1 6 (DNA) 0x80000001 0x00ABF0

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

192.168.103.1 10.1.2.1 627 0x80000001 0x005AC1

Router Link States (Area 23)

Link ID ADV Router Age Seq# Checksum Link count

10.1.2.1 10.1.2.1 736 0x80000003 0x00DD8B 2

192.168.103.1 192.168.103.1 635 0x80000006 0x002E52 3

Summary Net Link States (Area 23)

Link ID ADV Router Age Seq# Checksum

10.1.1.0 10.1.2.1 1388 0x80000001 0x0006DB

10.1.2.0 10.1.2.1 1365 0x80000001 0x0078A8

10.1.12.0 10.1.2.1 1388 0x80000001 0x008255

192.168.100.0 192.168.103.1 746 0x80000001 0x00ABF0

Summary ASB Link States (Area 23)

Link ID ADV Router Age Seq# Checksum

192.168.103.1 10.1.2.1 629 0x80000001 0x005AC1

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

0.0.0.0 192.168.103.1 636 0x80000001 0x00558B 1

R2#sho ip route

Gateway of last resort is 10.1.23.3 to network 0.0.0.0

10.0.0.0/24 is subnetted, 5 subnets

C 10.1.12.0 is directly connected, Serial0/0

O 10.1.3.0 [110/65] via 10.1.23.3, 00:11:04, Serial0/1

C 10.1.2.0 is directly connected, Loopback2

O 10.1.1.0 [110/65] via 10.1.12.1, 00:11:04, Serial0/0

C 10.1.23.0 is directly connected, Serial0/1

O IA 192.168.100.0/24 [110/65] via 10.1.23.3, 00:11:04, Serial0/1

O*E2 0.0.0.0/0 [110/1] via 10.1.23.3, 00:11:04, Serial0/1

R2#sho ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

192.168.103.1 0 FULL/ - - 10.1.23.3 OSPF_VL0

172.30.30.1 0 FULL/ - 00:00:39 10.1.12.1 Serial0/0

192.168.103.1 0 FULL/ - 00:00:37 10.1.23.3 Serial0/1

R3#sho ip ospf database

OSPF Router with ID (192.168.103.1) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.1.2.1 10.1.2.1 1 (DNA) 0x80000005 0x0024DF 4

172.30.30.1 172.30.30.1 653 (DNA) 0x80000004 0x000A69 3

192.168.103.1 192.168.103.1 757 0x80000003 0x00A96C 1

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

10.1.3.0 10.1.2.1 509 (DNA) 0x80000001 0x00EFEF

10.1.3.0 192.168.103.1 868 0x80000001 0x00FD5E

10.1.23.0 10.1.2.1 660 (DNA) 0x80000001 0x0009C3

10.1.23.0 192.168.103.1 868 0x80000001 0x00996F

192.168.100.0 192.168.103.1 868 0x80000001 0x00ABF0

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

192.168.103.1 10.1.2.1 1 (DNA) 0x80000001 0x005AC1

Router Link States (Area 23)

Link ID ADV Router Age Seq# Checksum Link count

10.1.2.1 10.1.2.1 863 0x80000003 0x00DD8B 2

192.168.103.1 192.168.103.1 760 0x80000006 0x002E52 3

Summary Net Link States (Area 23)

Link ID ADV Router Age Seq# Checksum

10.1.1.0 10.1.2.1 1514 0x80000001 0x0006DB

10.1.2.0 10.1.2.1 1491 0x80000001 0x0078A8

10.1.12.0 10.1.2.1 1514 0x80000001 0x008255

192.168.100.0 192.168.103.1 870 0x80000001 0x00ABF0

Summary ASB Link States (Area 23)

Link ID ADV Router Age Seq# Checksum

192.168.103.1 10.1.2.1 756 0x80000001 0x005AC1

Router Link States (Area 100)

Link ID ADV Router Age Seq# Checksum Link count

192.168.103.1 192.168.103.1 760 0x80000004 0x00FCBD 1

Summary Net Link States (Area 100)

Link ID ADV Router Age Seq# Checksum

10.1.1.0 192.168.103.1 857 0x80000001 0x0019C4

10.1.2.0 192.168.103.1 857 0x80000001 0x008B91

10.1.3.0 192.168.103.1 872 0x80000001 0x00FD5E

10.1.12.0 192.168.103.1 857 0x80000001 0x00953E

10.1.23.0 192.168.103.1 872 0x80000001 0x00996F

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

0.0.0.0 192.168.103.1 762 0x80000001 0x00558B 1

R3# sho ip route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 5 subnets

O 10.1.12.0 [110/128] via 10.1.23.2, 00:13:38, Serial0/0

C 10.1.3.0 is directly connected, Loopback3

O 10.1.2.0 [110/65] via 10.1.23.2, 00:13:38, Serial0/0

O 10.1.1.0 [110/129] via 10.1.23.2, 00:13:38, Serial0/0

C 10.1.23.0 is directly connected, Serial0/0

C 192.168.102.0/24 is directly connected, Loopback102

C 192.168.103.0/24 is directly connected, Loopback103

C 192.168.100.0/24 is directly connected, Loopback100

C 192.168.101.0/24 is directly connected, Loopback101

R3#sho ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.1.2.1 0 FULL/ - - 10.1.23.2 OSPF_VL0

10.1.2.1 0 FULL/ - 00:00:32 10.1.23.2 Serial0/0

OSPF Virtual Links and Area Summarization

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