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R1#sh ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  10.1.12.1       YES manual up                    up     
Serial0/1                  10.1.13.1       YES manual up                    up     
Loopback0                  1.1.1.1         YES manual up                    up 

R2#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  10.1.12.2       YES manual up                    up     
Serial0/1                  10.1.24.2       YES manual up                    down   
Loopback0                  2.2.2.2         YES manual up                    up    

R3#sh ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  10.1.13.3       YES manual up                    up     
Serial0/1                  10.1.34.3       YES manual up                    up     
Loopback0                  3.3.3.3         YES manual up                    up 

R4#sh ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  10.1.24.4       YES manual up                    up     
Serial0/1                  10.1.34.4       YES manual up                    up     
Serial0/2                  10.1.45.4       YES manual up                    up     
Loopback0                  4.4.4.4         YES manual up                    up

R5#sh ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  10.1.45.5       YES manual up                    up     
FastEthernet1/0            10.1.56.5       YES manual up                    up     
Loopback0                  5.5.5.5         YES manual up                    up 

R6#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.56.6       YES manual up                    up     
Loopback0                  6.6.6.6         YES manual up                    up     
Loopback1                  6.6.7.6         YES manual up                    up     
Loopback2                  6.6.8.6         YES manual up                    up     
Loopback3                  6.6.9.6         YES manual up                    up 

Redistribute

R5(config)#router ospf 1
R5(config-router)#redistribute rip subnets
R5(config-router)#exit
R5(config)#router rip
R5(config-router)#version 2
R5(config-router)#redistribute ospf 1 metric 1

Before Area 1 as Stub Area

R1#sho ip route ospf
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.1.12.2, 00:09:57, Serial0/0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 10.1.13.3, 00:09:57, Serial0/1
     4.0.0.0/32 is subnetted, 1 subnets
O IA    4.4.4.4 [110/129] via 10.1.13.3, 00:07:55, Serial0/1
                [110/129] via 10.1.12.2, 00:07:55, Serial0/0
     5.0.0.0/32 is subnetted, 1 subnets
O IA    5.5.5.5 [110/193] via 10.1.13.3, 00:06:12, Serial0/1
                [110/193] via 10.1.12.2, 00:06:12, Serial0/0
     6.0.0.0/24 is subnetted, 4 subnets
O E2    6.6.6.0 [110/20] via 10.1.13.3, 00:00:39, Serial0/1
                [110/20] via 10.1.12.2, 00:00:39, Serial0/0
O E2    6.6.7.0 [110/20] via 10.1.13.3, 00:00:39, Serial0/1
                [110/20] via 10.1.12.2, 00:00:39, Serial0/0
O E2    6.6.8.0 [110/20] via 10.1.13.3, 00:00:39, Serial0/1
                [110/20] via 10.1.12.2, 00:00:39, Serial0/0
O E2    6.6.9.0 [110/20] via 10.1.13.3, 00:00:39, Serial0/1
                [110/20] via 10.1.12.2, 00:00:41, Serial0/0
     10.0.0.0/24 is subnetted, 6 subnets
O IA    10.1.24.0 [110/128] via 10.1.12.2, 00:07:56, Serial0/0
O IA    10.1.45.0 [110/192] via 10.1.13.3, 00:07:21, Serial0/1
                  [110/192] via 10.1.12.2, 00:07:21, Serial0/0
O IA    10.1.34.0 [110/128] via 10.1.13.3, 00:07:54, Serial0/1
O E2    10.1.56.0 [110/20] via 10.1.13.3, 00:00:43, Serial0/1
                  [110/20] via 10.1.12.2, 00:00:43, Serial0/0

Configuration on R1,R2,R3

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

After Area 1 as Stub Area

R1#sh ip route ospf
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.1.12.2, 00:00:21, Serial0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/193] via 10.1.12.2, 00:00:21, Serial0/0
     4.0.0.0/32 is subnetted, 1 subnets
O IA    4.4.4.4 [110/129] via 10.1.12.2, 00:00:04, Serial0/0
     5.0.0.0/32 is subnetted, 1 subnets
O IA    5.5.5.5 [110/193] via 10.1.12.2, 00:00:04, Serial0/0
     10.0.0.0/24 is subnetted, 5 subnets
O IA    10.1.24.0 [110/128] via 10.1.12.2, 00:00:04, Serial0/0
O IA    10.1.45.0 [110/192] via 10.1.12.2, 00:00:04, Serial0/0
O IA    10.1.34.0 [110/192] via 10.1.12.2, 00:00:04, Serial0/0
O*IA 0.0.0.0/0 [110/65] via 10.1.12.2, 00:00:04, Serial0/0

R1#sho ip ospf database database-summary

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

Area 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0      
  Network       0        0        0      
  Summary Net   12       0        0      
  Summary ASBR  0        0        0      
  Type-7 Ext    0        0        0      
    Prefixes redistributed in Type-7  0
  Opaque Link   0        0        0      
  Opaque Area   0        0        0      
  Subtotal      15       0        0      

Process 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0      
  Network       0        0        0      
  Summary Net   12       0        0      
  Summary ASBR  0        0        0      
  Type-7 Ext    0        0        0      
  Opaque Link   0        0        0      
  Opaque Area   0        0        0      
  Type-5 Ext    0        0        0      
      Prefixes redistributed in Type-5  0
  Opaque AS     0        0        0      
  Total         15       0        0     

Configuration on R2,R3 (ABR)

R2(config)#router ospf 1
R2(config-router)#area 1 stub no-summary

After Area 1 as Totally Stubby Area

R1(config-router)#do sh ip route ospf
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.1.12.2, 00:07:05, Serial0/0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 10.1.13.3, 00:07:05, Serial0/1
O*IA 0.0.0.0/0 [110/65] via 10.1.13.3, 00:00:02, Serial0/1
               [110/65] via 10.1.12.2, 00:00:02, Serial0/0

R1#ping 6.6.6.6

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 60/74/88 ms
R1#ping 6.6.9.6

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.9.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/64/72 m
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