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Ospf maintains an database called as LSDB (Link state database) which is nothing but a single source of topology information where the contents are LSA’s (Link
state advertisements) and the database must be synchronized within the area that means there must be no difference anywhere otherwise will not provide a loop free OSPF domain. With Ospf we can use multiple area design to enhanced scalability by splitting the network into area’s so that database in each area can become smaller and seemingly more stable. With Ospf Multi area design there are different types of LSA flooded per area as well per domain, they are as follows

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Registration Link: Click Here!

Link-State Advertisement (LSA)Types :
LSA 1: Router LSA
LSA 2: Network LSA
LSA 3: Summary Network LSA
LSA 4: ASBR Summary LSA
LSA 5: External LSA
LSA 7: NSSA External LSA

But it becomes difficult when the number of LSA’s are flooded across the OSPF domain which can lead to increase in memory consumption and cpu processing of
every routers with in an area and that’s where ospf special area types comes in to focus.

Refer to the following topology diagram

ospf

1. OSPF Stub Area: Area 1
-> The purpose of Stub configured is to limit the number of LSAs flooding into the
area to conserve bandwidth and router CPUs.
-> Ospf stub allows the routers in an area to use an default route for forwarding
packets to ABR (Area Border Router).
-> It allows routing information from type 1 LSA, type 2, and type 3 LSA.
-> It blocks type 4 LSA and type 5 LSA.
-> ABR injects a Default route as type 3 LSA (O*IA) to get the reachability to the
external networks (Type 4 and Type 5 LSA).

For Free Demo classes Call: 7798058777

Registration Link: Click Here!

Rules to configure a Stub Area
->Area must not be an area 0. (Area 0 is known as Backbone area)
->Area must not have an ASBR anywhere in an area which is configured as Stub
Area.
->Virtual-Link must not be pass through that area which is configured as Stub
Area.
->All the other Routers in area must be configured as Stub.

Configurations:
On R2:
R2#config t
R2(config)#router ospf 1
R2(config-router)#area 1 stub
On R7:
R7#config t
R7(config)#router ospf 1
R7(config-router)#area 1 stub

 

Before stub configuration After stub configuration
R7#show ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.1,
00:00:32, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.1,
00:00:32, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.1,
00:00:32, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.1,
00:00:32, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.1,
00:00:32, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/11] via 220.20.20.1,
00:00:35, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/11] via 220.20.20.1,
00:00:35, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/11] via 220.20.20.1,
00:00:35, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/11] via 220.20.20.1,
00:00:35, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O 11.11.11.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O 12.12.12.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O 13.13.13.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O 14.14.14.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O 15.15.15.1 [110/11] via
220.20.20.1, 00:00:35, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O IA 31.31.31.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O IA 32.32.32.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.33.33.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.34.34.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.35.35.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O IA 41.41.41.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O IA 42.42.42.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O IA 43.43.43.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O IA 44.44.44.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O IA 45.45.45.1 [110/21] via
220.20.20.1, 00:00:32, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via
220.20.20.1, 00:00:35, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
66.0.0.0/32 is subnetted, 1 subnets
O IA 66.66.66.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
67.0.0.0/32 is subnetted, 1 subnets
O IA 67.67.67.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
68.0.0.0/32 is subnetted, 1 subnets
O IA 68.68.68.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
69.0.0.0/32 is subnetted, 1 subnets
O IA 69.69.69.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
70.0.0.0/32 is subnetted, 1 subnets
O IA 70.70.70.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
71.0.0.0/24 is subnetted, 1 subnets
O E2 71.71.71.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
72.0.0.0/24 is subnetted, 1 subnets
O E2 72.72.72.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
73.0.0.0/24 is subnetted, 1 subnets
O E2 73.73.73.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
74.0.0.0/24 is subnetted, 1 subnets
O E2 74.74.74.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
75.0.0.0/24 is subnetted, 1 subnets
O E2 75.75.75.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
76.0.0.0/32 is subnetted, 1 subnets
O IA 76.76.76.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
77.0.0.0/32 is subnetted, 1 subnets
O IA 77.77.77.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
78.0.0.0/32 is subnetted, 1 subnets
O IA 78.78.78.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
79.0.0.0/32 is subnetted, 1 subnets
O IA 79.79.79.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
80.0.0.0/32 is subnetted, 1 subnets
O IA 80.80.80.1 [110/31] via
220.20.20.1, 00:00:32, Ethernet0/0
81.0.0.0/24 is subnetted, 1 subnets
O E2 81.81.81.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
82.0.0.0/24 is subnetted, 1 subnets
O E2 82.82.82.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
83.0.0.0/24 is subnetted, 1 subnets
O E2 83.83.83.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
84.0.0.0/24 is subnetted, 1 subnets
O E2 84.84.84.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
85.0.0.0/24 is subnetted, 1 subnets
O E2 85.85.85.0 [110/20] via
220.20.20.1, 00:00:30, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via
220.20.20.1, 00:00:35, Ethernet0/0
91.0.0.0/24 is subnetted, 1 subnets
O E2 91.91.91.0 [110/20] via
220.20.20.1, 00:00:35, Ethernet0/0
92.0.0.0/24 is subnetted, 1 subnets
O E2 92.92.92.0 [110/20] via
220.20.20.1, 00:00:35, Ethernet0/0
93.0.0.0/24 is subnetted, 1 subnets
O E2 93.93.93.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
94.0.0.0/24 is subnetted, 1 subnets
O E2 94.94.94.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
95.0.0.0/24 is subnetted, 1 subnets
O E2 95.95.95.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
R7(config-router)#do sh ip route ospf
O*IA 0.0.0.0/0 [110/11] via 220.20.20.1,
00:00:03, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.1, 00:00:03,
Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.1, 00:00:46, Ethernet0/0
220.20.20.0/24 is variably subnetted,
6 subnets, 2 masks
O IA 220.20.20.4/30 [110/30] via
220.20.20.1, 00:00:46, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.1, 00:00:43, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.1, 00:00:47, Ethernet0/0

So after configuring stub area. E2 routes which was showing before were got
eliminated from routing table.

For Free Demo classes Call: 7798058777

Registration Link: Click Here!

2. OSPF Totally-Stub Area:
-> Ospf totally-stub allows the routers in an area to use an default route for
forwarding packets to ABR(Area Border Router).
-> It allows routing information from type 1 LSA and type 2 LSA.
-> It blocks type 3, type 4 and type 5 LSA.
-> ABR injects a Default route as type 3 LSA (O*IA) to get the reachability to the
internal as well as external networks (Type 4 and Type 5 LSA).

Configurations for Totally-Stub Area:
On R3:
R3#config t
R3(config)#router ospf 1
R3(config-router)#area 2 stub no-summary

On R8:
R8#config t
R8(config)#router ospf 1
R8(config-router)#area 2 stub

 

Before Configuring Totally-Stub After Configuring Totally-Stub
R8#sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O 21.21.21.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O 22.22.22.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O 23.23.23.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O 24.24.24.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O 25.25.25.1 [110/11] via 220.20.20.5,
00:02:46, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O IA 31.31.31.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O IA 32.32.32.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.33.33.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.34.34.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.35.35.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O IA 41.41.41.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O IA 42.42.42.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O IA 43.43.43.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O IA 44.44.44.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O IA 45.45.45.1 [110/21] via 220.20.20.5,
00:02:42, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via 220.20.20.5,
00:02:46, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
66.0.0.0/32 is subnetted, 1 subnets
O IA 66.66.66.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
67.0.0.0/32 is subnetted, 1 subnets
O IA 67.67.67.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
68.0.0.0/32 is subnetted, 1 subnets
O IA 68.68.68.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
69.0.0.0/32 is subnetted, 1 subnets
O IA 69.69.69.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
70.0.0.0/32 is subnetted, 1 subnets
O IA 70.70.70.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
71.0.0.0/24 is subnetted, 1 subnets
O E2 71.71.71.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
72.0.0.0/24 is subnetted, 1 subnets
O E2 72.72.72.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
73.0.0.0/24 is subnetted, 1 subnets
O E2 73.73.73.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
74.0.0.0/24 is subnetted, 1 subnets
O E2 74.74.74.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
75.0.0.0/24 is subnetted, 1 subnets
O E2 75.75.75.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
76.0.0.0/32 is subnetted, 1 subnets
O IA 76.76.76.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
77.0.0.0/32 is subnetted, 1 subnets
O IA 77.77.77.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
78.0.0.0/32 is subnetted, 1 subnets
O IA 78.78.78.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
79.0.0.0/32 is subnetted, 1 subnets
O IA 79.79.79.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
80.0.0.0/32 is subnetted, 1 subnets
O IA 80.80.80.1 [110/31] via 220.20.20.5,
00:02:42, Ethernet0/0
81.0.0.0/24 is subnetted, 1 subnets
O E2 81.81.81.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
82.0.0.0/24 is subnetted, 1 subnets
O E2 82.82.82.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
83.0.0.0/24 is subnetted, 1 subnets
O E2 83.83.83.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
84.0.0.0/24 is subnetted, 1 subnets
O E2 84.84.84.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
85.0.0.0/24 is subnetted, 1 subnets
O E2 85.85.85.0 [110/20] via 220.20.20.5,
00:02:41, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via 220.20.20.5,
00:02:46, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via 220.20.20.5,
00:02:46, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via 220.20.20.5,
00:02:46, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via 220.20.20.5,
00:02:46, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via 220.20.20.5,
00:02:46, Ethernet0/0
91.0.0.0/24 is subnetted, 1 subnets
O E2 91.91.91.0 [110/20] via 220.20.20.5,
00:02:46, Ethernet0/0
92.0.0.0/24 is subnetted, 1 subnets
O E2 92.92.92.0 [110/20] via 220.20.20.5,
00:02:53, Ethernet0/0
93.0.0.0/24 is subnetted, 1 subnets
O E2 93.93.93.0 [110/20] via 220.20.20.5,
00:02:53, Ethernet0/0
94.0.0.0/24 is subnetted, 1 subnets
O E2 94.94.94.0 [110/20] via 220.20.20.5,
00:02:54, Ethernet0/0
95.0.0.0/24 is subnetted, 1 subnets
O E2 95.95.95.0 [110/20] via 220.20.20.5,
00:02:54, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.5, 00:02:54, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.5, 00:02:50, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.5, 00:02:51, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.5, 00:02:51, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.5, 00:02:55, Ethernet0/0
R8#sh ip route ospf
O*IA 0.0.0.0/0 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O 21.21.21.1 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O 22.22.22.1 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O 23.23.23.1 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O 24.24.24.1 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O 25.25.25.1 [110/11] via 220.20.20.5,
00:00:04, Ethernet0/0

So after configuring Totally-Stub area E1, E2 & O IA routes are eliminated from routing table.

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3. OSPF NSSA (Not So Stubby Area) :
-> As Stub area rule says there must not be a ASBR in area.
-> But if the area is configured as stub it will allow type1, type 2 & type 3 LSA’s & it
will block type 4 & type 5 and inject’s a default route for other ospf routers to
reach those external routes via ABR. But if that area as an ASBR injecting external
routes then it will be blocked as per the stub rule. and other ospf routers would
not be able to reach those external routes.
-> To overcome this restrictions NSSA is configured.
-> NSSA Breaks the rules of stub area and allows ASBR to inject its routes.
-> In NSSA Type 7 LSA’S are sent by ASBR, and ABR converts it to Type 5 LSA.
-> Also, it injects a default route as a Type 3 LSA (O*IA) to reach the other routing
doming routes.
-> It allows Type 1, Type 2, Type 3 & Type 7 LSA’s.
-> It blocks Type 4 & Type 5 LSA’s.

Configurations for NSSA:
On R4:
R4#config t
R4(config)#router ospf 1
R4(config-router)#area 3 nssa
On R9:
R9#Config t
R9(config)#router ospf 1
R9(config-router)area 3 nssa

Before configuring NSSA After Configuring NSSA
R9#sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O 31.31.31.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O 32.32.32.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O 33.33.33.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O 34.34.34.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O 35.35.35.1 [110/11] via 220.20.20.9,
00:01:34, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O IA 41.41.41.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O IA 42.42.42.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O IA 43.43.43.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O IA 44.44.44.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O IA 45.45.45.1 [110/21] via 220.20.20.9,
00:01:30, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via 220.20.20.9,
00:01:34, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
76.0.0.0/32 is subnetted, 1 subnets
O IA 76.76.76.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
77.0.0.0/32 is subnetted, 1 subnets
O IA 77.77.77.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
78.0.0.0/32 is subnetted, 1 subnets
O IA 78.78.78.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
79.0.0.0/32 is subnetted, 1 subnets
O IA 79.79.79.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
80.0.0.0/32 is subnetted, 1 subnets
O IA 80.80.80.1 [110/31] via 220.20.20.9,
00:01:30, Ethernet0/0
81.0.0.0/24 is subnetted, 1 subnets
O E2 81.81.81.0 [110/20] via 220.20.20.9,
00:01:29, Ethernet0/0
82.0.0.0/24 is subnetted, 1 subnets
O E2 82.82.82.0 [110/20] via 220.20.20.9,
00:01:29, Ethernet0/0
83.0.0.0/24 is subnetted, 1 subnets
O E2 83.83.83.0 [110/20] via 220.20.20.9,
00:01:29, Ethernet0/0
84.0.0.0/24 is subnetted, 1 subnets
O E2 84.84.84.0 [110/20] via 220.20.20.9,
00:01:29, Ethernet0/0
85.0.0.0/24 is subnetted, 1 subnets
O E2 85.85.85.0 [110/20] via 220.20.20.9,
00:01:29, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via 220.20.20.9,
00:01:34, Ethernet0/0
91.0.0.0/24 is subnetted, 1 subnets
O E2 91.91.91.0 [110/20] via 220.20.20.9,
00:01:34, Ethernet0/0
92.0.0.0/24 is subnetted, 1 subnets
O E2 92.92.92.0 [110/20] via 220.20.20.9,
00:01:34, Ethernet0/0
93.0.0.0/24 is subnetted, 1 subnets
O E2 93.93.93.0 [110/20] via 220.20.20.9,
00:01:34, Ethernet0/0
94.0.0.0/24 is subnetted, 1 subnets
O E2 94.94.94.0 [110/20] via 220.20.20.9,
00:01:34, Ethernet0/0
95.0.0.0/24 is subnetted, 1 subnets
O E2 95.95.95.0 [110/20] via 220.20.20.9,
00:01:34, Ethernet0/0
192.168.100.0/29 is subnetted, 1 subnets
O IA 192.168.100.0 [110/20] via
220.20.20.9, 00:01:34, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.9, 00:01:30, Ethernet0/0
O IA 220.20.20.4/30 [110/30] via
220.20.20.9, 00:01:42, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.9, 00:01:38, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.9, 00:01:42, Ethernet0/0
R9(config-router)#do sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O 31.31.31.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O 32.32.32.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O 33.33.33.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O 34.34.34.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O 35.35.35.1 [110/11] via 220.20.20.9,
00:00:04, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O IA 41.41.41.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O IA 42.42.42.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O IA 43.43.43.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O IA 44.44.44.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O IA 45.45.45.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via 220.20.20.9,
00:00:04, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
76.0.0.0/32 is subnetted, 1 subnets
O IA 76.76.76.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
77.0.0.0/32 is subnetted, 1 subnets
O IA 77.77.77.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
78.0.0.0/32 is subnetted, 1 subnets
O IA 78.78.78.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
79.0.0.0/32 is subnetted, 1 subnets
O IA 79.79.79.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
80.0.0.0/32 is subnetted, 1 subnets
O IA 80.80.80.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via 220.20.20.9,
00:00:04, Ethernet0/0
192.168.100.0/29 is subnetted, 1 subnets
O IA 192.168.100.0 [110/20] via
220.20.20.9, 00:00:04, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.9, 00:00:04, Ethernet0/0
O IA 220.20.20.4/30 [110/30] via
220.20.20.9, 00:00:04, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.9, 00:00:04, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.9, 00:00:04, Ethernet0/0

So after configuring NSSA E1 & E2 routes are eliminated from the routing table.
4. OSPF NSSA with default route:
-> In NSSA Type 7 LSA’S are sent by ASBR, and ABR converts it to Type 5 LSA.
-> Also it injects a default route as a Type 7 LSA (O*N2) to reach the other routing
domain routes as well as internal routes.
-> It allows Type 1, Type 2 & Type 7 LSA’s.
-> It blocks Type 3 Type 4 & Type 5 LSA’s.
Configurations for NSSA with default route
On R5:
R5#config t
R5(config)#router ospf 1
R5(config-router)#area 4 nssa default-information-originate
On R10:
R10#config t
R10(config)#router ospf 1
R10(config-router)area 4 nssa

For Free Demo classes Call: 7798058777

Registration Link: Click Here!

Before Configuring NSSA default After configuring NSSA default
R10#sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O IA 31.31.31.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O IA 32.32.32.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.33.33.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.34.34.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.35.35.1 [110/21] via 220.20.20.13,
00:03:29, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O 41.41.41.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O 42.42.42.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O 43.43.43.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O 44.44.44.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O 45.45.45.1 [110/11] via 220.20.20.13,
00:03:33, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via 220.20.20.13,
00:03:33, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
66.0.0.0/32 is subnetted, 1 subnets
O IA 66.66.66.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
67.0.0.0/32 is subnetted, 1 subnets
O IA 67.67.67.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
68.0.0.0/32 is subnetted, 1 subnets
O IA 68.68.68.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
69.0.0.0/32 is subnetted, 1 subnets
O IA 69.69.69.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
70.0.0.0/32 is subnetted, 1 subnets
O IA 70.70.70.1 [110/31] via 220.20.20.13,
00:03:29, Ethernet0/0
71.0.0.0/24 is subnetted, 1 subnets
O E2 71.71.71.0 [110/20] via
220.20.20.13, 00:03:28, Ethernet0/0
72.0.0.0/24 is subnetted, 1 subnets
O E2 72.72.72.0 [110/20] via
220.20.20.13, 00:03:28, Ethernet0/0
73.0.0.0/24 is subnetted, 1 subnets
O E2 73.73.73.0 [110/20] via
220.20.20.13, 00:03:28, Ethernet0/0
74.0.0.0/24 is subnetted, 1 subnets
O E2 74.74.74.0 [110/20] via
220.20.20.13, 00:03:28, Ethernet0/0
75.0.0.0/24 is subnetted, 1 subnets
O E2 75.75.75.0 [110/20] via
220.20.20.13, 00:03:28, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via 220.20.20.13,
00:03:33, Ethernet0/0
91.0.0.0/24 is subnetted, 1 subnets
O E2 91.91.91.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
92.0.0.0/24 is subnetted, 1 subnets
O E2 92.92.92.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
93.0.0.0/24 is subnetted, 1 subnets
O E2 93.93.93.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
94.0.0.0/24 is subnetted, 1 subnets
O E2 94.94.94.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
95.0.0.0/24 is subnetted, 1 subnets
O E2 95.95.95.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
192.168.100.0/29 is subnetted, 1 subnets
O IA 192.168.100.0 [110/20] via
220.20.20.13, 00:03:33, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.13, 00:03:32, Ethernet0/0
O IA 220.20.20.4/30 [110/30] via
220.20.20.13, 00:03:36, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.13, 00:03:32, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.13, 00:03:36, Ethernet0/0
R10(config-router)#do sh ip route ospf
O*N2 0.0.0.0/0 [110/1] via 220.20.20.13,
00:00:11, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.13,
00:00:11, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O IA 31.31.31.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O IA 32.32.32.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.33.33.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.34.34.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.35.35.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O 41.41.41.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O 42.42.42.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O 43.43.43.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O 44.44.44.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O 45.45.45.1 [110/11] via
220.20.20.13, 00:00:11, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O IA 51.51.51.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O IA 52.52.52.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O IA 53.53.53.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O IA 54.54.54.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.55.55.1 [110/21] via
220.20.20.13, 00:00:11, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
66.0.0.0/32 is subnetted, 1 subnets
O IA 66.66.66.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
67.0.0.0/32 is subnetted, 1 subnets
O IA 67.67.67.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
68.0.0.0/32 is subnetted, 1 subnets
O IA 68.68.68.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
69.0.0.0/32 is subnetted, 1 subnets
O IA 69.69.69.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
70.0.0.0/32 is subnetted, 1 subnets
O IA 70.70.70.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
86.0.0.0/32 is subnetted, 1 subnets
O IA 86.86.86.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
87.0.0.0/32 is subnetted, 1 subnets
O IA 87.87.87.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
88.0.0.0/32 is subnetted, 1 subnets
O IA 88.88.88.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
89.0.0.0/32 is subnetted, 1 subnets
O IA 89.89.89.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
90.0.0.0/32 is subnetted, 1 subnets
O IA 90.90.90.1 [110/31] via
220.20.20.13, 00:00:11, Ethernet0/0
192.168.100.0/29 is subnetted, 1
subnets
O IA 192.168.100.0 [110/20] via
220.20.20.13, 00:00:11, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.13, 00:00:11, Ethernet0/0
O IA 220.20.20.4/30 [110/30] via
220.20.20.13, 00:00:11, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.13, 00:00:11, Ethernet0/0
O IA 220.20.20.16/30 [110/30] via
220.20.20.13, 00:00:11, Ethernet0/0

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After Configuring NSSA with default E1 & E2 routes from routing table got
eliminated.
5. OSPF Totally-NSSA
-> It will block Type 3, Type 4 and Type 5 LSA’s.
-> It will allow Type 1 and Type 2 LSA’s.
-> It will inject a default route as Type 7 LSA (O*N2) to get reachability to the
external routes and internal routes.
Configurations For Totally-NSSA:
On R6:
R6#config t
R6(config)#router ospf 1
R6(config-router)#area 5 nssa no-summary
On R11:
R11#config t
R11(config)#router ospf 1
R11(config-router)#area 5 nssa

 

Before configuring Totally-NSSA After Configuring Totally-NSSA
R11#sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O IA 8.8.8.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
10.0.0.0/32 is subnetted, 1 subnets
O IA 10.10.10.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
11.0.0.0/32 is subnetted, 1 subnets
O IA 11.11.11.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
16.0.0.0/32 is subnetted, 1 subnets
O IA 16.16.16.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
17.0.0.0/32 is subnetted, 1 subnets
O IA 17.17.17.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
18.0.0.0/32 is subnetted, 1 subnets
O IA 18.18.18.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
19.0.0.0/32 is subnetted, 1 subnets
O IA 19.19.19.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
20.0.0.0/32 is subnetted, 1 subnets
O IA 20.20.20.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
21.0.0.0/32 is subnetted, 1 subnets
O IA 21.21.21.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
22.0.0.0/32 is subnetted, 1 subnets
O IA 22.22.22.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
23.0.0.0/32 is subnetted, 1 subnets
O IA 23.23.23.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
24.0.0.0/32 is subnetted, 1 subnets
O IA 24.24.24.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
25.0.0.0/32 is subnetted, 1 subnets
O IA 25.25.25.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
26.0.0.0/32 is subnetted, 1 subnets
O IA 26.26.26.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
27.0.0.0/32 is subnetted, 1 subnets
O IA 27.27.27.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
28.0.0.0/32 is subnetted, 1 subnets
O IA 28.28.28.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
29.0.0.0/32 is subnetted, 1 subnets
O IA 29.29.29.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
30.0.0.0/32 is subnetted, 1 subnets
O IA 30.30.30.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
31.0.0.0/32 is subnetted, 1 subnets
O IA 31.31.31.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
32.0.0.0/32 is subnetted, 1 subnets
O IA 32.32.32.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.33.33.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.34.34.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.35.35.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
36.0.0.0/32 is subnetted, 1 subnets
O IA 36.36.36.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
37.0.0.0/32 is subnetted, 1 subnets
O IA 37.37.37.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
38.0.0.0/32 is subnetted, 1 subnets
O IA 38.38.38.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
39.0.0.0/32 is subnetted, 1 subnets
O IA 39.39.39.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
40.0.0.0/32 is subnetted, 1 subnets
O IA 40.40.40.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
41.0.0.0/32 is subnetted, 1 subnets
O IA 41.41.41.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
42.0.0.0/32 is subnetted, 1 subnets
O IA 42.42.42.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
43.0.0.0/32 is subnetted, 1 subnets
O IA 43.43.43.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
44.0.0.0/32 is subnetted, 1 subnets
O IA 44.44.44.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
45.0.0.0/32 is subnetted, 1 subnets
O IA 45.45.45.1 [110/21] via 220.20.20.17,
00:04:09, Ethernet0/0
46.0.0.0/32 is subnetted, 1 subnets
O IA 46.46.46.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
47.0.0.0/32 is subnetted, 1 subnets
O IA 47.47.47.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
48.0.0.0/32 is subnetted, 1 subnets
O IA 48.48.48.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
49.0.0.0/32 is subnetted, 1 subnets
O IA 49.49.49.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
50.0.0.0/32 is subnetted, 1 subnets
O IA 50.50.50.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O 51.51.51.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O 52.52.52.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O 53.53.53.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O 54.54.54.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O 55.55.55.1 [110/11] via 220.20.20.17,
00:04:09, Ethernet0/0
56.0.0.0/32 is subnetted, 1 subnets
O IA 56.56.56.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
57.0.0.0/32 is subnetted, 1 subnets
O IA 57.57.57.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
58.0.0.0/32 is subnetted, 1 subnets
O IA 58.58.58.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
59.0.0.0/32 is subnetted, 1 subnets
O IA 59.59.59.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
60.0.0.0/32 is subnetted, 1 subnets
O IA 60.60.60.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
61.0.0.0/32 is subnetted, 1 subnets
O IA 61.61.61.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
62.0.0.0/32 is subnetted, 1 subnets
O IA 62.62.62.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
64.0.0.0/32 is subnetted, 1 subnets
O IA 64.64.64.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
65.0.0.0/32 is subnetted, 1 subnets
O IA 65.65.65.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
66.0.0.0/32 is subnetted, 1 subnets
O IA 66.66.66.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
67.0.0.0/32 is subnetted, 1 subnets
O IA 67.67.67.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
68.0.0.0/32 is subnetted, 1 subnets
O IA 68.68.68.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
69.0.0.0/32 is subnetted, 1 subnets
O IA 69.69.69.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
70.0.0.0/32 is subnetted, 1 subnets
O IA 70.70.70.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
71.0.0.0/24 is subnetted, 1 subnets
O E2 71.71.71.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
72.0.0.0/24 is subnetted, 1 subnets
O E2 72.72.72.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
73.0.0.0/24 is subnetted, 1 subnets
O E2 73.73.73.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
74.0.0.0/24 is subnetted, 1 subnets
O E2 74.74.74.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
75.0.0.0/24 is subnetted, 1 subnets
O E2 75.75.75.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
76.0.0.0/32 is subnetted, 1 subnets
O IA 76.76.76.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
77.0.0.0/32 is subnetted, 1 subnets
O IA 77.77.77.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
78.0.0.0/32 is subnetted, 1 subnets
O IA 78.78.78.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
79.0.0.0/32 is subnetted, 1 subnets
O IA 79.79.79.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
80.0.0.0/32 is subnetted, 1 subnets
O IA 80.80.80.1 [110/31] via 220.20.20.17,
00:04:09, Ethernet0/0
81.0.0.0/24 is subnetted, 1 subnets
O E2 81.81.81.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
82.0.0.0/24 is subnetted, 1 subnets
O E2 82.82.82.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
83.0.0.0/24 is subnetted, 1 subnets
O E2 83.83.83.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
84.0.0.0/24 is subnetted, 1 subnets
O E2 84.84.84.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
85.0.0.0/24 is subnetted, 1 subnets
O E2 85.85.85.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
192.168.100.0/29 is subnetted, 1 subnets
O IA 192.168.100.0 [110/20] via 220.20.20.17,
00:04:09, Ethernet0/0
220.20.20.0/24 is variably subnetted, 6
subnets, 2 masks
O IA 220.20.20.0/30 [110/30] via
220.20.20.17, 00:04:11, Ethernet0/0
O IA 220.20.20.4/30 [110/30] via
220.20.20.17, 00:04:11, Ethernet0/0
O IA 220.20.20.8/30 [110/30] via
220.20.20.17, 00:04:11, Ethernet0/0
O IA 220.20.20.12/30 [110/30] via
220.20.20.17, 00:04:11, Ethernet0/0
R11(config-router)#do sh ip route ospf
O*IA 0.0.0.0/0 [110/11] via 220.20.20.17,
00:00:08, Ethernet0/0
51.0.0.0/32 is subnetted, 1 subnets
O 51.51.51.1 [110/11] via
220.20.20.17, 00:00:08, Ethernet0/0
52.0.0.0/32 is subnetted, 1 subnets
O 52.52.52.1 [110/11] via
220.20.20.17, 00:00:08, Ethernet0/0
53.0.0.0/32 is subnetted, 1 subnets
O 53.53.53.1 [110/11] via
220.20.20.17, 00:00:08, Ethernet0/0
54.0.0.0/32 is subnetted, 1 subnets
O 54.54.54.1 [110/11] via
220.20.20.17, 00:00:08, Ethernet0/0
55.0.0.0/32 is subnetted, 1 subnets
O 55.55.55.1 [110/11] via
220.20.20.17, 00:00:08, Ethernet0/0

So after configuring totally-NSSA area only directly connected route and a default route which is advertised will be shown in routing table. Hope this information is useful and informative for you all guys. Keep studying and enhance your skill’s.

Note:Blog is written by Mr.Nitin and Assisted by Himself along with all the CCNP Students of SevenMentor Training Institute in Pune

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