The router doesn't have detailed information about network topology outside of its area, thereby reducing the size of its database.
[*] Do not advertise the 172.16 via network! Use redistribute command ; )
Routing table of [R2] before the use of totally stub are type:
R2# sh ip route
...
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/2] via 192.168.12.1, 00:00:00, FastEthernet0/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
172.16.0.0/24 is subnetted, 4 subnets
O E2 172.16.0.0 [110/20] via 192.168.12.1, 00:00:00, FastEthernet0/0
O E2 172.16.1.0 [110/20] via 192.168.12.1, 00:00:00, FastEthernet0/0
O E2 172.16.2.0 [110/20] via 192.168.12.1, 00:00:00, FastEthernet0/0
O E2 172.16.3.0 [110/20] via 192.168.12.1, 00:00:01, FastEthernet0/0
O E2 172.16.4.0 [110/20] via 192.168.12.1, 00:00:01, FastEthernet0/0
O E2 172.16.5.0 [110/20] via 192.168.12.1, 00:00:01, FastEthernet0/0
And after the stub option configured:
R2# sh ip route
...
Gateway of last resort is 192.168.12.1 to network 0.0.0.0
C 192.168.12.0/24 is directly connected, FastEthernet0/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
O*IA 0.0.0.0/0 [110/2] via 192.168.12.1, 00:29:49, FastEthernet0/0
Wow
So, how I can do that also? Very simple! at R1, run:
R1# conf t
R1(config)# router ospf [id]
R1(config-router)# area 1 stub no-summary
And .. to not receive this:
OSPF: Hello from 192.168.12.1 with mismatched Stub/Transit area option bitf 1
Configure at [R2] also ; )
R2# conf t
R2(config)# router ospf [id]
R2(config-router)# area 1 stub
Remember, to form adj the ospf routers need agree:
-- hello / dead-interval
-- area id
-- password [if using auth]
-- stub area flag
-- mtu
OSPF Stub Network Resources:
biOos
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