LAB: OSPF Not-so-Totally-Stubby Areas

Not-so-totally-stubby area is the same as totally stubby area in the concept of blocking type3 summary LSA, type4 ASBR summary LSAs, and Type5 External LSAs and replacing  with only type3 summary LSA default route.

configuration set at ABR

R3

router ospf  1

area 2 nssa no-summary

verification:

Rack1SW3#show ip route ospf
     155.1.0.0/24 is subnetted, 5 subnets
O       155.1.7.0 [110/60] via 155.1.79.7, 00:37:23, Vlan79
O       155.1.37.0 [110/330] via 155.1.79.7, 00:37:23, Vlan79
O       155.1.67.0 [110/60] via 155.1.79.7, 00:37:23, Vlan79
O N2 200.0.0.0/24 [110/20] via 155.1.79.7, 00:00:29, Vlan79
     54.0.0.0/24 is subnetted, 1 subnets
O N2    54.1.1.0 [110/20] via 155.1.79.7, 00:00:29, Vlan79
O N2 200.0.1.0/24 [110/20] via 155.1.79.7, 00:00:29, Vlan79
O N2 200.0.2.0/24 [110/20] via 155.1.79.7, 00:00:29, Vlan79
O N2 200.0.3.0/24 [110/20] via 155.1.79.7, 00:00:29, Vlan79
     150.1.0.0/24 is subnetted, 2 subnets
O       150.1.7.0 [110/31] via 155.1.79.7, 00:37:24, Vlan79
O*IA 0.0.0.0/0 [110/331] via 155.1.79.7, 00:00:34, Vlan79


Rack1SW3#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 155.1.79.7 to network 0.0.0.0

     155.1.0.0/24 is subnetted, 5 subnets
C       155.1.9.0 is directly connected, Vlan9
O       155.1.7.0 [110/60] via 155.1.79.7, 00:41:57, Vlan79
O       155.1.37.0 [110/330] via 155.1.79.7, 00:41:57, Vlan79
C       155.1.79.0 is directly connected, Vlan79
O       155.1.67.0 [110/60] via 155.1.79.7, 00:41:57, Vlan79
O N2 200.0.0.0/24 [110/20] via 155.1.79.7, 00:05:02, Vlan79
     54.0.0.0/24 is subnetted, 1 subnets
O N2    54.1.1.0 [110/20] via 155.1.79.7, 00:05:02, Vlan79
O N2 200.0.1.0/24 [110/20] via 155.1.79.7, 00:05:03, Vlan79
O N2 200.0.2.0/24 [110/20] via 155.1.79.7, 00:05:03, Vlan79
O N2 200.0.3.0/24 [110/20] via 155.1.79.7, 00:05:03, Vlan79
     150.1.0.0/24 is subnetted, 2 subnets
O       150.1.7.0 [110/31] via 155.1.79.7, 00:41:59, Vlan79
C       150.1.9.0 is directly connected, Loopback0
O*IA 0.0.0.0/0 [110/331] via 155.1.79.7, 00:05:10, Vlan79