Friday, 28 April 2017

External Route Summarization - OSPF



External route can only be summarized on ASBR only.

R1:-

interface Loopback0
 ip address 1.1.1.1 255.255.255.255

interface FastEthernet0/0
 description *** Connected to R2***
 ip address 12.12.12.1 255.255.255.0
no shut

interface FastEthernet1/0
description *** Connected to LAN1***
 ip address 10.1.1.17 255.255.255.240
no shut

interface FastEthernet2/0
description *** Connected to LAN2***
 ip address 10.1.1.1 255.255.255.240
no shut

interface FastEthernet3/0
description *** Connected to LAN3***
 ip address 10.1.1.33 255.255.255.240
no shut

router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 1
 network 10.1.1.1 0.0.0.0 area 1
 network 10.1.1.17 0.0.0.0 area 1
 network 10.1.1.33 0.0.0.0 area 1
 network 12.12.12.1 0.0.0.0 area 1


R2:-

interface FastEthernet0/0
description *** Connected to R1***
 ip address 12.12.12.2 255.255.255.0
no shut

interface FastEthernet0/1
description *** Connected to R3***
 ip address 23.23.23.2 255.255.255.0
no shut

router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 0
 network 12.12.12.2 0.0.0.0 area 1
 network 23.23.23.2 0.0.0.0 area 0


R3:-

interface Loopback0
 ip address 3.3.3.3 255.255.255.255

interface FastEthernet0/0
description *** Connected to LAN1***
 ip address 30.1.1.1 255.255.255.240
no shut

interface FastEthernet0/1
description *** Connected to R2***
 ip address 23.23.23.3 255.255.255.0
no shut

interface FastEthernet1/0
description *** Connected to R4***
 ip address 34.34.34.3 255.255.255.0
no shut

interface FastEthernet2/0
description *** Connected to LAN2***
 ip address 30.1.1.17 255.255.255.240
no shut

interface FastEthernet3/0
description *** Connected to LAN3***
 ip address 30.1.1.33 255.255.255.240
no shut

router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 summary-address 30.1.1.0 255.255.255.0   \\Summarization of small /28 subnet to /24
 redistribute connected subnets
 network 3.3.3.3 0.0.0.0 area 0
 network 23.23.23.3 0.0.0.0 area 0
 network 34.34.34.3 0.0.0.0 area 0
R4:-

interface FastEthernet0/0
description *** Connected to R5***
 ip address 45.45.45.4 255.255.255.0
no shut

interface FastEthernet1/0
description *** Connected to R3***
 ip address 34.34.34.4 255.255.255.0
no shut

router ospf 1
 router-id 4.4.4.4
 log-adjacency-changes
network 4.4.4.4 0.0.0.0 area 0
 network 34.34.34.4 0.0.0.0 area 0
 network 45.45.45.4 0.0.0.0 area 2


R5:-

interface FastEthernet0/0
 description *** Connected to R4***
 ip address 45.45.45.5 255.255.255.0
no shut

interface FastEthernet2/0
description *** Connected to LAN1***
 ip address 50.1.1.1 255.255.255.0
no shut

router ospf 1
 router-id 5.5.5.5
 log-adjacency-changes
 network 5.5.5.5 0.0.0.0 area 2
 network 45.45.45.5 0.0.0.0 area 2
 network 50.1.1.1 0.0.0.0 area 2


Verification:-

R1:-

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           1   FULL/BDR        00:00:37    12.12.12.2      FastEthernet0/0

R1#sh ip route ospf
     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.34.34.0 [110/12] via 12.12.12.2, 05:21:44, FastEthernet0/0
     50.0.0.0/24 is subnetted, 1 subnets
O IA    50.1.1.0 [110/14] via 12.12.12.2, 05:21:44, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/12] via 12.12.12.2, 03:31:23, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/11] via 12.12.12.2, 05:21:44, FastEthernet0/0
     45.0.0.0/24 is subnetted, 1 subnets
O IA    45.45.45.0 [110/13] via 12.12.12.2, 05:21:44, FastEthernet0/0
     30.0.0.0/24 is subnetted, 1 subnets
O E2    30.1.1.0 [110/20] via 12.12.12.2, 00:04:18, FastEthernet0/0  \\Summarized /24 route



R1#sh ip route 30.1.1.1
Routing entry for 30.1.1.0/24
  Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric 11
  Last update from 12.12.12.2 on FastEthernet0/0, 00:05:57 ago
  Routing Descriptor Blocks:
  * 12.12.12.2, from 3.3.3.3, 00:05:57 ago, via FastEthernet0/0
      Route metric is 20, traffic share count is 1


R1#sh ip ospf database

            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         994         0x80000011 0x008FC8 5
2.2.2.2         2.2.2.2         1037        0x8000000F 0x003395 1

                Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
12.12.12.1      1.1.1.1         1501        0x8000000D 0x0034C4

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         2.2.2.2         540         0x80000007 0x00CA56
23.23.23.0      2.2.2.2         1037        0x8000000D 0x00FFE2
34.34.34.0      2.2.2.2         1037        0x8000000D 0x007C44
45.45.45.0      2.2.2.2         1037        0x8000000D 0x00F8A5
50.1.1.0        2.2.2.2         1037        0x8000000D 0x00B937

                Summary ASB Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         2.2.2.2         783         0x80000007 0x00B26E

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         269         0x8000000D 0x00D691 0
R1#

R1#sh ip ospf database external

            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Type-5 AS External Link States

  Routing Bit Set on this LSA
  LS age: 313
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 30.1.1.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 8000000D
  Checksum: 0xD691
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        TOS: 0
        Metric: 20
        Forward Address: 0.0.0.0
        External Route Tag: 0

R2:-

2#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           1   FULL/DR         00:00:30    23.23.23.3      FastEthernet0/1
1.1.1.1           1   FULL/DR         00:00:38    12.12.12.1      FastEthernet0/0

R2#show ip route ospf
Codes: L - local, 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, H - NHRP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
O        1.1.1.1 [110/2] via 12.12.12.1, 00:14:38, FastEthernet0/0
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/2] via 23.23.23.3, 00:14:38, FastEthernet0/1
      10.0.0.0/28 is subnetted, 3 subnets
O        10.1.1.0 [110/2] via 12.12.12.1, 00:14:38, FastEthernet0/0
O        10.1.1.16 [110/2] via 12.12.12.1, 00:14:38, FastEthernet0/0
O        10.1.1.32 [110/2] via 12.12.12.1, 00:14:38, FastEthernet0/0
      30.0.0.0/24 is subnetted, 1 subnets
O E2     30.1.1.0 [110/20] via 23.23.23.3, 00:08:07, FastEthernet0/1
      34.0.0.0/24 is subnetted, 1 subnets
O        34.34.34.0 [110/2] via 23.23.23.3, 00:14:38, FastEthernet0/1
      45.0.0.0/24 is subnetted, 1 subnets
O IA     45.45.45.0 [110/3] via 23.23.23.3, 00:14:38, FastEthernet0/1
      50.0.0.0/24 is subnetted, 1 subnets
O IA     50.1.1.0 [110/4] via 23.23.23.3, 00:14:38, FastEthernet0/1

R2#show ip route 30.1.1.1
Routing entry for 30.1.1.0/24
  Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric 1
  Last update from 23.23.23.3 on FastEthernet0/1, 00:08:15 ago
  Routing Descriptor Blocks:
  * 23.23.23.3, from 3.3.3.3, 00:08:15 ago, via FastEthernet0/1
      Route metric is 20, traffic share count is 1

R2#sh ip ospf database

            OSPF Router with ID (2.2.2.2) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         1274        0x8000000F 0x00DDA6 1
3.3.3.3         3.3.3.3         1159        0x80000013 0x00E68E 3
4.4.4.4         4.4.4.4         1228        0x8000000E 0x00042C 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
23.23.23.3      3.3.3.3         1400        0x8000000C 0x009C2A
34.34.34.4      4.4.4.4         1228        0x8000000C 0x003B5D

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         2.2.2.2         1274        0x8000000A 0x002105
10.1.1.0        2.2.2.2         885         0x8000000C 0x0057D3
10.1.1.16       2.2.2.2         890         0x80000001 0x00CC59
10.1.1.32       2.2.2.2         890         0x80000001 0x002CE9
12.12.12.0      2.2.2.2         1274        0x8000000A 0x009373
45.45.45.0      4.4.4.4         1228        0x8000000C 0x00AAEE
50.1.1.0        4.4.4.4         1228        0x8000000C 0x006B80

                Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         1233        0x80000011 0x008FC8 5
2.2.2.2         2.2.2.2         1274        0x8000000F 0x003395 1

                Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
12.12.12.1      1.1.1.1         1740        0x8000000D 0x0034C4

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         2.2.2.2         776         0x80000007 0x00CA56
23.23.23.0      2.2.2.2         1274        0x8000000D 0x00FFE2
34.34.34.0      2.2.2.2         1274        0x8000000D 0x007C44
45.45.45.0      2.2.2.2         1274        0x8000000D 0x00F8A5
50.1.1.0        2.2.2.2         1274        0x8000000D 0x00B937

                Summary ASB Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         2.2.2.2         1020        0x80000007 0x00B26E

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         504         0x8000000D 0x00D691 0
R2#

R3:-

R3#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
4.4.4.4           1   FULL/DR         00:00:35    34.34.34.4      FastEthernet1/0
2.2.2.2           1   FULL/BDR        00:00:38    23.23.23.2      FastEthernet0/1

R3#sh ip route
Codes: L - local, 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, H - NHRP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
O IA     1.1.1.1 [110/3] via 23.23.23.2, 03:39:07, FastEthernet0/1
      3.0.0.0/32 is subnetted, 1 subnets
C        3.3.3.3 is directly connected, Loopback0
      10.0.0.0/28 is subnetted, 3 subnets
O IA     10.1.1.0 [110/3] via 23.23.23.2, 00:15:52, FastEthernet0/1
O IA     10.1.1.16 [110/3] via 23.23.23.2, 00:15:57, FastEthernet0/1
O IA     10.1.1.32 [110/3] via 23.23.23.2, 00:15:57, FastEthernet0/1
      12.0.0.0/24 is subnetted, 1 subnets
O IA     12.12.12.0 [110/2] via 23.23.23.2, 03:39:07, FastEthernet0/1
      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        23.23.23.0/24 is directly connected, FastEthernet0/1
L        23.23.23.3/32 is directly connected, FastEthernet0/1
      30.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O        30.1.1.0/24 is a summary, 00:09:31, Null0
C        30.1.1.0/28 is directly connected, FastEthernet0/0
L        30.1.1.1/32 is directly connected, FastEthernet0/0
C        30.1.1.16/28 is directly connected, FastEthernet2/0
L        30.1.1.17/32 is directly connected, FastEthernet2/0
C        30.1.1.32/28 is directly connected, FastEthernet3/0
L        30.1.1.33/32 is directly connected, FastEthernet3/0
      34.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        34.34.34.0/24 is directly connected, FastEthernet1/0
L        34.34.34.3/32 is directly connected, FastEthernet1/0
      45.0.0.0/24 is subnetted, 1 subnets
O IA     45.45.45.0 [110/2] via 34.34.34.4, 03:39:07, FastEthernet1/0
      50.0.0.0/24 is subnetted, 1 subnets
O IA     50.1.1.0 [110/3] via 34.34.34.4, 03:39:07, FastEthernet1/0

R3#sh ip route ospf
Codes: L - local, 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, H - NHRP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
O IA     1.1.1.1 [110/3] via 23.23.23.2, 03:39:11, FastEthernet0/1
      10.0.0.0/28 is subnetted, 3 subnets
O IA     10.1.1.0 [110/3] via 23.23.23.2, 00:15:56, FastEthernet0/1
O IA     10.1.1.16 [110/3] via 23.23.23.2, 00:16:01, FastEthernet0/1
O IA     10.1.1.32 [110/3] via 23.23.23.2, 00:16:01, FastEthernet0/1
      12.0.0.0/24 is subnetted, 1 subnets
O IA     12.12.12.0 [110/2] via 23.23.23.2, 03:39:11, FastEthernet0/1
      30.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O        30.1.1.0/24 is a summary, 00:09:35, Null0
      45.0.0.0/24 is subnetted, 1 subnets
O IA     45.45.45.0 [110/2] via 34.34.34.4, 03:39:11, FastEthernet1/0
      50.0.0.0/24 is subnetted, 1 subnets
O IA     50.1.1.0 [110/3] via 34.34.34.4, 03:39:11, FastEthernet1/0

R3#sh ip route 30.1.1.0
Routing entry for 30.1.1.0/28
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via ospf 1
  Routing Descriptor Blocks:
  * directly connected, via FastEthernet0/0
      Route metric is 0, traffic share count is 1

R3#sh ip ospf database

            OSPF Router with ID (3.3.3.3) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         1558        0x8000000F 0x00DDA6 1
3.3.3.3         3.3.3.3         1442        0x80000013 0x00E68E 3
4.4.4.4         4.4.4.4         1511        0x8000000E 0x00042C 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
23.23.23.3      3.3.3.3         1682        0x8000000C 0x009C2A
34.34.34.4      4.4.4.4         1510        0x8000000C 0x003B5D

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         2.2.2.2         1558        0x8000000A 0x002105
10.1.1.0        2.2.2.2         1169        0x8000000C 0x0057D3
10.1.1.16       2.2.2.2         1174        0x80000001 0x00CC59
10.1.1.32       2.2.2.2         1174        0x80000001 0x002CE9
12.12.12.0      2.2.2.2         1558        0x8000000A 0x009373
45.45.45.0      4.4.4.4         1511        0x8000000C 0x00AAEE
50.1.1.0        4.4.4.4         1511        0x8000000C 0x006B80

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         787         0x8000000D 0x00D691 0


R3#sh ip ospf database external 30.1.1.0

            OSPF Router with ID (3.3.3.3) (Process ID 1)

                Type-5 AS External Link States

  LS age: 800
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 30.1.1.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 8000000D
  Checksum: 0xD691
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        MTID: 0
        Metric: 20
        Forward Address: 0.0.0.0
        External Route Tag: 0

R4:-

R4#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           1   FULL/BDR        00:00:31    34.34.34.3      FastEthernet1/0
5.5.5.5           1   FULL/BDR        00:00:39    45.45.45.5      FastEthernet0/0

R4#sh ip route ospf
Codes: L - local, 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, H - NHRP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
O IA     1.1.1.1 [110/4] via 34.34.34.3, 05:41:59, FastEthernet1/0
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/2] via 34.34.34.3, 03:51:43, FastEthernet1/0
      10.0.0.0/28 is subnetted, 3 subnets
O IA     10.1.1.0 [110/4] via 34.34.34.3, 00:31:00, FastEthernet1/0
O IA     10.1.1.16 [110/4] via 34.34.34.3, 00:31:05, FastEthernet1/0
O IA     10.1.1.32 [110/4] via 34.34.34.3, 00:31:05, FastEthernet1/0
      12.0.0.0/24 is subnetted, 1 subnets
O IA     12.12.12.0 [110/3] via 34.34.34.3, 05:41:59, FastEthernet1/0
      23.0.0.0/24 is subnetted, 1 subnets
O        23.23.23.0 [110/2] via 34.34.34.3, 05:58:22, FastEthernet1/0
      30.0.0.0/24 is subnetted, 1 subnets
O E2     30.1.1.0 [110/20] via 34.34.34.3, 00:24:33, FastEthernet1/0
      50.0.0.0/24 is subnetted, 1 subnets
O        50.1.1.0 [110/2] via 45.45.45.5, 05:58:22, FastEthernet0/0

R4#sh ip ospf database

            OSPF Router with ID (4.4.4.4) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         244         0x80000010 0x00DBA7 1
3.3.3.3         3.3.3.3         132         0x80000014 0x00E48F 3
4.4.4.4         4.4.4.4         173         0x8000000F 0x00022D 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
23.23.23.3      3.3.3.3         379         0x8000000D 0x009A2B
34.34.34.4      4.4.4.4         173         0x8000000D 0x00395E

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         2.2.2.2         244         0x8000000B 0x001F06
10.1.1.0        2.2.2.2         1867        0x8000000C 0x0057D3
10.1.1.16       2.2.2.2         1872        0x80000001 0x00CC59
10.1.1.32       2.2.2.2         1872        0x80000001 0x002CE9
12.12.12.0      2.2.2.2         244         0x8000000B 0x009174
45.45.45.0      4.4.4.4         173         0x8000000D 0x00A8EF
50.1.1.0        4.4.4.4         173         0x8000000D 0x006981

                Router Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum Link count
4.4.4.4         4.4.4.4         173         0x8000000E 0x009A53 1
5.5.5.5         5.5.5.5         58          0x8000000E 0x007B1C 2

                Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
45.45.45.4      4.4.4.4         173         0x8000000D 0x00105E

                Summary Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         4.4.4.4         426         0x8000000B 0x00F624
3.3.3.3         4.4.4.4         1949        0x80000007 0x008E8A
10.1.1.0        4.4.4.4         1865        0x8000000C 0x002FF1
10.1.1.16       4.4.4.4         1870        0x80000001 0x00A477
10.1.1.32       4.4.4.4         1870        0x80000001 0x000408
12.12.12.0      4.4.4.4         426         0x8000000B 0x006992
23.23.23.0      4.4.4.4         173         0x8000000D 0x00CD0C
34.34.34.0      4.4.4.4         173         0x8000000E 0x003484

                Summary ASB Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         4.4.4.4         1949        0x80000007 0x0076A2

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         1484        0x8000000D 0x00D691 0

R4#sh ip ospf database external 30.1.1.0

            OSPF Router with ID (4.4.4.4) (Process ID 1)

                Type-5 AS External Link States

  Routing Bit Set on this LSA in topology Base with MTID 0
  LS age: 1490
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 30.1.1.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 8000000D
  Checksum: 0xD691
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        MTID: 0
        Metric: 20
        Forward Address: 0.0.0.0
        External Route Tag: 0

R5:-

R5#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
4.4.4.4           1   FULL/DR         00:00:34    45.45.45.4      FastEthernet0/0

R5#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

     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.34.34.0 [110/11] via 45.45.45.4, 06:45:20, FastEthernet0/0
     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1 [110/14] via 45.45.45.4, 05:42:40, FastEthernet0/0
     50.0.0.0/24 is subnetted, 1 subnets
C       50.1.1.0 is directly connected, FastEthernet2/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/12] via 45.45.45.4, 03:52:25, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/12] via 45.45.45.4, 06:45:21, FastEthernet0/0
     10.0.0.0/28 is subnetted, 3 subnets
O IA    10.1.1.0 [110/14] via 45.45.45.4, 00:31:42, FastEthernet0/0
O IA    10.1.1.16 [110/14] via 45.45.45.4, 00:31:45, FastEthernet0/0
O IA    10.1.1.32 [110/14] via 45.45.45.4, 00:31:45, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
O IA    12.12.12.0 [110/13] via 45.45.45.4, 05:42:42, FastEthernet0/0
     45.0.0.0/24 is subnetted, 1 subnets
C       45.45.45.0 is directly connected, FastEthernet0/0
     30.0.0.0/24 is subnetted, 1 subnets
O E2    30.1.1.0 [110/20] via 45.45.45.4, 00:25:21, FastEthernet0/0

R5#sh ip route ospf
     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.34.34.0 [110/11] via 45.45.45.4, 06:45:25, FastEthernet0/0
     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1 [110/14] via 45.45.45.4, 05:42:46, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/12] via 45.45.45.4, 03:52:31, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/12] via 45.45.45.4, 06:45:25, FastEthernet0/0
     10.0.0.0/28 is subnetted, 3 subnets
O IA    10.1.1.0 [110/14] via 45.45.45.4, 00:31:47, FastEthernet0/0
O IA    10.1.1.16 [110/14] via 45.45.45.4, 00:31:49, FastEthernet0/0
O IA    10.1.1.32 [110/14] via 45.45.45.4, 00:31:49, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
O IA    12.12.12.0 [110/13] via 45.45.45.4, 05:42:46, FastEthernet0/0
     30.0.0.0/24 is subnetted, 1 subnets
O E2    30.1.1.0 [110/20] via 45.45.45.4, 00:25:25, FastEthernet0/0

R5#sh ip ospf database

            OSPF Router with ID (5.5.5.5) (Process ID 1)

                Router Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum Link count
4.4.4.4         4.4.4.4         221         0x8000000E 0x009A53 1
5.5.5.5         5.5.5.5         104         0x8000000E 0x007B1C 2

                Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
45.45.45.4      4.4.4.4         221         0x8000000D 0x00105E

                Summary Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         4.4.4.4         474         0x8000000B 0x00F624
3.3.3.3         4.4.4.4         1998        0x80000007 0x008E8A
10.1.1.0        4.4.4.4         1913        0x8000000C 0x002FF1
10.1.1.16       4.4.4.4         1916        0x80000001 0x00A477
10.1.1.32       4.4.4.4         1916        0x80000001 0x000408
12.12.12.0      4.4.4.4         474         0x8000000B 0x006992
23.23.23.0      4.4.4.4         221         0x8000000D 0x00CD0C
34.34.34.0      4.4.4.4         222         0x8000000E 0x003484

                Summary ASB Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         4.4.4.4         1999        0x80000007 0x0076A2

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         1534        0x8000000D 0x00D691 0

R5#sh ip ospf database external 30.1.1.0

            OSPF Router with ID (5.5.5.5) (Process ID 1)

                Type-5 AS External Link States

  Routing Bit Set on this LSA
  LS age: 1545
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 30.1.1.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 8000000D
  Checksum: 0xD691
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        TOS: 0
        Metric: 20
        Forward Address: 0.0.0.0
        External Route Tag: 0

R5:-

R5#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
4.4.4.4           1   FULL/DR         00:00:34    45.45.45.4      FastEthernet0/0


R5#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

     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.34.34.0 [110/11] via 45.45.45.4, 06:45:20, FastEthernet0/0
     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1 [110/14] via 45.45.45.4, 05:42:40, FastEthernet0/0
     50.0.0.0/24 is subnetted, 1 subnets
C       50.1.1.0 is directly connected, FastEthernet2/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/12] via 45.45.45.4, 03:52:25, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/12] via 45.45.45.4, 06:45:21, FastEthernet0/0
     10.0.0.0/28 is subnetted, 3 subnets
O IA    10.1.1.0 [110/14] via 45.45.45.4, 00:31:42, FastEthernet0/0
O IA    10.1.1.16 [110/14] via 45.45.45.4, 00:31:45, FastEthernet0/0
O IA    10.1.1.32 [110/14] via 45.45.45.4, 00:31:45, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
O IA    12.12.12.0 [110/13] via 45.45.45.4, 05:42:42, FastEthernet0/0
     45.0.0.0/24 is subnetted, 1 subnets
C       45.45.45.0 is directly connected, FastEthernet0/0
     30.0.0.0/24 is subnetted, 1 subnets
O E2    30.1.1.0 [110/20] via 45.45.45.4, 00:25:21, FastEthernet0/0

R5#sh ip route ospf
     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.34.34.0 [110/11] via 45.45.45.4, 06:45:25, FastEthernet0/0
     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1 [110/14] via 45.45.45.4, 05:42:46, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/12] via 45.45.45.4, 03:52:31, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/12] via 45.45.45.4, 06:45:25, FastEthernet0/0
     10.0.0.0/28 is subnetted, 3 subnets
O IA    10.1.1.0 [110/14] via 45.45.45.4, 00:31:47, FastEthernet0/0
O IA    10.1.1.16 [110/14] via 45.45.45.4, 00:31:49, FastEthernet0/0
O IA    10.1.1.32 [110/14] via 45.45.45.4, 00:31:49, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
O IA    12.12.12.0 [110/13] via 45.45.45.4, 05:42:46, FastEthernet0/0
     30.0.0.0/24 is subnetted, 1 subnets
O E2    30.1.1.0 [110/20] via 45.45.45.4, 00:25:25, FastEthernet0/0

R5#sh ip ospf database

            OSPF Router with ID (5.5.5.5) (Process ID 1)

                Router Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum Link count
4.4.4.4         4.4.4.4         221         0x8000000E 0x009A53 1
5.5.5.5         5.5.5.5         104         0x8000000E 0x007B1C 2

                Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
45.45.45.4      4.4.4.4         221         0x8000000D 0x00105E

                Summary Net Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         4.4.4.4         474         0x8000000B 0x00F624
3.3.3.3         4.4.4.4         1998        0x80000007 0x008E8A
10.1.1.0        4.4.4.4         1913        0x8000000C 0x002FF1
10.1.1.16       4.4.4.4         1916        0x80000001 0x00A477
10.1.1.32       4.4.4.4         1916        0x80000001 0x000408
12.12.12.0      4.4.4.4         474         0x8000000B 0x006992
23.23.23.0      4.4.4.4         221         0x8000000D 0x00CD0C
34.34.34.0      4.4.4.4         222         0x8000000E 0x003484

                Summary ASB Link States (Area 2)

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         4.4.4.4         1999        0x80000007 0x0076A2

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
30.1.1.0        3.3.3.3         1534        0x8000000D 0x00D691 0

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