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R1#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.13.1       YES manual up                    up     
FastEthernet1/0            10.1.12.1       YES manual up                    up     
FastEthernet2/0            unassigned      YES unset  administratively down down   
Loopback0                  1.1.1.1         YES manual up                    up

R2#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.12.2       YES manual up                    up     
FastEthernet1/0            10.1.25.2       YES manual up                    up     
FastEthernet2/0            unassigned      YES unset  administratively down down   
Loopback0                  2.2.2.2         YES manual up                    up 

R3#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.34.3       YES manual up                    up     
FastEthernet1/0            10.1.13.3       YES manual up                    up     
Loopback0                  3.3.3.3         YES manual up                    up    
R4#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.34.4       YES manual up                    up      
Loopback0                  4.4.4.4         YES manual up                    up     

R5#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.25.5       YES manual up                    up     
Loopback0                  5.5.5.5         YES manual up                    up     

R1#sho run | s ospf
router ospf 1
 log-adjacency-changes
 no auto-cost
 area 1 nssa
 network 1.1.1.0 0.0.0.255 area 0
 network 10.1.12.0 0.0.0.255 area 0
 network 10.1.13.0 0.0.0.255 area 1

R2#sho run | s ospf
router ospf 1
 log-adjacency-changes
 no auto-cost
 network 2.2.2.0 0.0.0.255 area 0
 network 10.1.12.0 0.0.0.255 area 0
 network 10.1.25.0 0.0.0.255 area 2

R3#sho run | s ospf
 redistribute ospf 1 metric 1 1 1 1 1
router ospf 1
 log-adjacency-changes
 area 1 nssa
 redistribute eigrp 100 metric-type 1 subnets
 network 3.3.3.0 0.0.0.255 area 1
 network 10.1.13.0 0.0.0.255 area 1

R3#sho run | s eigrp
router eigrp 100
 redistribute ospf 1 metric 1 1 1 1 1
 network 10.1.34.0 0.0.0.255
 no auto-summary
 redistribute eigrp 100 metric-type 1 subnets

R4#sho run | s eigrp
router eigrp 100
 network 4.4.4.0 0.0.0.255
 network 10.1.34.0 0.0.0.255
 no auto-summary

R5#sho run | s ospf
router ospf 1
 log-adjacency-changes
 no auto-cost
 network 5.5.5.0 0.0.0.255 area 2
 network 10.1.25.0 0.0.0.255 area 2

R2#sho ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           1   FULL/BDR        00:00:35    10.1.12.1       FastEthernet0/0
5.5.5.5           1   FULL/DR         00:00:37    10.1.25.5       FastEthernet1/0


 R2#sho ip ospf database

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

                        Router Link States (Area 0)   LSA Type 1

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         927         0x80000006 0x0015BE 2
2.2.2.2         2.2.2.2         1589        0x80000006 0x0023A5 2

                        Net Link States (Area 0)   LSA Type 2

Link ID         ADV Router      Age         Seq#       Checksum
10.1.12.2       2.2.2.2         1589        0x80000002 0x00B05B

                        Summary Net Link States (Area 0)   LSA Type 3

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         1.1.1.1         901         0x80000001 0x004FD2
5.5.5.5         2.2.2.2         1589        0x80000002 0x00D242
10.1.13.0       1.1.1.1         1524        0x80000003 0x00AD67
10.1.25.0       2.2.2.2         1589        0x80000003 0x000BF9

                        Router Link States (Area 2)   LSA Type 1
         
Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         1589        0x80000003 0x003493 1
5.5.5.5         5.5.5.5         1651        0x80000005 0x009BEA 2

                        Net Link States (Area 2)  LSA Type 2

Link ID         ADV Router      Age         Seq#       Checksum
10.1.25.5       5.5.5.5         1651        0x80000002 0x00419E

                        Summary Net Link States (Area 2)  LSA Type 3

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         2.2.2.2         1591        0x80000002 0x008B99
2.2.2.2         2.2.2.2         1591        0x80000002 0x00F832
3.3.3.3         2.2.2.2         902         0x80000001 0x00957E
10.1.12.0       2.2.2.2         1591        0x80000003 0x009A77
10.1.13.0       2.2.2.2         1591        0x80000003 0x00F313

                        Summary ASB Link States (Area 2)  LSA Type 4

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         2.2.2.2         924         0x80000001 0x0075B0
         
                        Type-5 AS External Link States  LSA Type 5

Link ID         ADV Router      Age         Seq#       Checksum Tag
4.4.4.0         1.1.1.1         902         0x80000001 0x004CB8 0
10.1.34.0       1.1.1.1         905         0x80000001 0x00D60D 0


R1(config)#router ospf 1
R1(config-router)#area 1 nssa

R3(config)#router ospf 1
R3(config-router)#area 1 nssa

R1#sho ip ospf database

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

                        Router Link States (Area 0)    LSA Type 1

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         1551        0x80000006 0x0015BE 2
2.2.2.2         2.2.2.2         219         0x80000007 0x0021A6 2

                        Net Link States (Area 0)   LSA Type 2

Link ID         ADV Router      Age         Seq#       Checksum
10.1.12.2       2.2.2.2         219         0x80000003 0x00AE5C

                        Summary Net Link States (Area 0)   LSA Type 3

Link ID         ADV Router      Age         Seq#       Checksum
3.3.3.3         1.1.1.1         1525        0x80000001 0x004FD2
5.5.5.5         2.2.2.2         219         0x80000003 0x00D043
10.1.13.0       1.1.1.1         123         0x80000004 0x00AB68
10.1.25.0       2.2.2.2         219         0x80000004 0x0009FA

                        Router Link States (Area 1)   LSA Type 1
         
Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         1530        0x80000006 0x00FAE4 1
3.3.3.3         3.3.3.3         1530        0x80000007 0x005B5E 2

                        Net Link States (Area 1)   LSA Type 2

Link ID         ADV Router      Age         Seq#       Checksum
10.1.13.3       3.3.3.3         1533        0x80000001 0x0047B5

                        Summary Net Link States (Area 1)   LSA Type 3

Link ID         ADV Router      Age         Seq#       Checksum
1.1.1.1         1.1.1.1         1554        0x80000003 0x00E843
2.2.2.2         1.1.1.1         1554        0x80000004 0x001DFF
5.5.5.5         1.1.1.1         1554        0x80000004 0x00F610
10.1.12.0       1.1.1.1         1554        0x80000004 0x005CB2
10.1.25.0       1.1.1.1         1554        0x80000004 0x0031C6

                        Type-7 AS External Link States (Area 1)   LSA Type 7

Link ID         ADV Router      Age         Seq#       Checksum Tag
4.4.4.0         3.3.3.3         1534        0x80000001 0x007B77 0
10.1.34.0       3.3.3.3         1535        0x80000001 0x0006CB 0

                        Type-5 AS External Link States   LSA Type 5

Link ID         ADV Router      Age         Seq#       Checksum Tag
4.4.4.0         1.1.1.1         1529        0x80000001 0x004CB8 0
10.1.34.0       1.1.1.1         1529        0x80000001 0x00D60D 0

Before nssa

R1#sho 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: 29
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 4.4.4.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 80000001
  Checksum: 0x798F
  Length: 36
  Network Mask: /24
            Metric Type: 1 (Comparable directly to link state metric)
            TOS: 0
            Metric: 20
            Forward Address: 0.0.0.0
            External Route Tag: 0

  Routing Bit Set on this LSA
  LS age: 28
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 10.1.34.0 (External Network Number )
  Advertising Router: 3.3.3.3
  LS Seq Number: 80000001
  Checksum: 0x4E3
  Length: 36
  Network Mask: /24
            Metric Type: 1 (Comparable directly to link state metric)
            TOS: 0
            Metric: 20
            Forward Address: 0.0.0.0
            External Route Tag: 0

After nssa

R1#sho ip ospf database external

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

                        Type-5 AS External Link States

  LS age: 1727
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 4.4.4.0 (External Network Number )
  Advertising Router: 1.1.1.1
  LS Seq Number: 80000001
  Checksum: 0x4CB8
  Length: 36
  Network Mask: /24
            Metric Type: 1 (Comparable directly to link state metric)
            TOS: 0
            Metric: 20
            Forward Address: 3.3.3.3
            External Route Tag: 0

  LS age: 1727
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 10.1.34.0 (External Network Number )
  Advertising Router: 1.1.1.1
  LS Seq Number: 80000001
  Checksum: 0xD60D
  Length: 36
  Network Mask: /24
            Metric Type: 1 (Comparable directly to link state metric)
            TOS: 0
            Metric: 20
            Forward Address: 3.3.3.3
            External Route Tag: 0

R4#sho ip route
Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
D EX    1.1.1.1 [170/2560002816] via 10.1.34.3, 00:01:44, FastEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
D EX    2.2.2.2 [170/2560002816] via 10.1.34.3, 00:01:44, FastEthernet0/0
     3.0.0.0/24 is subnetted, 1 subnets
D EX    3.3.3.0 [170/2560002816] via 10.1.34.3, 00:47:14, FastEthernet0/0
     4.0.0.0/24 is subnetted, 1 subnets
C       4.4.4.0 is directly connected, Loopback0
     5.0.0.0/32 is subnetted, 1 subnets
D EX    5.5.5.5 [170/2560002816] via 10.1.34.3, 00:01:46, FastEthernet0/0
     10.0.0.0/24 is subnetted, 4 subnets
D EX    10.1.13.0 [170/2560002816] via 10.1.34.3, 00:47:16, FastEthernet0/0
D EX    10.1.12.0 [170/2560002816] via 10.1.34.3, 00:01:46, FastEthernet0/0
D EX    10.1.25.0 [170/2560002816] via 10.1.34.3, 00:01:47, FastEthernet0/0
C       10.1.34.0 is directly connected, FastEthernet0/0

R5#sho ip route
Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1 [110/21] via 10.1.25.2, 01:16:50, FastEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
O IA    2.2.2.2 [110/11] via 10.1.25.2, 01:17:46, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/31] via 10.1.25.2, 00:02:28, FastEthernet0/0
     4.0.0.0/24 is subnetted, 1 subnets
O E1    4.4.4.0 [110/50] via 10.1.25.2, 00:02:25, FastEthernet0/0
     5.0.0.0/24 is subnetted, 1 subnets
C       5.5.5.0 is directly connected, Loopback0
     10.0.0.0/24 is subnetted, 4 subnets
O IA    10.1.13.0 [110/30] via 10.1.25.2, 01:16:34, FastEthernet0/0
O IA    10.1.12.0 [110/20] via 10.1.25.2, 01:17:40, FastEthernet0/0
C       10.1.25.0 is directly connected, FastEthernet0/0
O E1    10.1.34.0 [110/50] via 10.1.25.2, 00:02:27, FastEthernet0/0

R4#ping 5.5.5.5    

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/88/192 ms

R5#ping 4.4.4.4

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/60/96 ms
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