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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-56
SwitchD#show ip route
Codes: C - connected, S - static, R - RIP, B - BGP
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
Gateway of last resort is no set
S 172.10.10.0/24 [1/0] via 192.168.6.2
O E2 191.10.10.0/24 [110/20] via 192.168.3.1, 00:00:21, GigabitEthernet 0/3
O IA 192.168.1.0/24 [110/2] via 192.168.3.1, 00:00:21, GigabitEthernet 0/3
O IA 192.168.2.0/24 [110/3] via 192.168.3.1, 00:00:21, GigabitEthernet 0/3
C 192.168.3.0/24 is directly connected, GigabitEthernet 0/3
C 192.168.3.2/32 is local host.
O IA 192.168.5.0/24 [110/4] via 192.168.3.1, 00:00:21, GigabitEthernet 0/3
C 192.168.6.0/24 is directly connected, GigabitEthernet 0/4
C 192.168.6.1/32 is local host.
Display OSPF routing table of Switch B (ABR)
SwitchB#show ip route ospf
O E2 172.10.10.0/24 [110/20] via 192.168.3.2, 17:53:35, GigabitEthernet 0/2
Type7 LSA on ASBR
O E2 191.10.10.0/24 [110/20] via 192.168.1.1, 00:57:46, GigabitEthernet 0/1
O IA 192.168.2.0/24 [110/2] via 192.168.1.1, 5d,15:39:01, GigabitEthernet 0/1
O IA 192.168.5.0/24 [110/3] via 192.168.1.1, 01:10:34, GigabitEthernet 0/1
O 192.168.6.0/24 [110/2] via 192.168.3.2, 17:53:36, GigabitEthernet 0/2
Step 2: Display the routing tables of respective devices in NSSA area when Area
2 is configured as NSSA area.
Display OSPF routing table of Switch B (ABR)
SwitchB#show ip route ospf
O N2 172.10.10.0/24 [110/20] via 192.168.3.2, 00:01:00, GigabitEthernet 0/2
O E2 191.10.10.0/24 [110/20] via 192.168.1.1, 01:11:26, GigabitEthernet 0/1
O IA 192.168.2.0/24 [110/2] via 192.168.1.1, 5d,15:52:41, GigabitEthernet 0/1
O IA 192.168.5.0/24 [110/3] via 192.168.1.1, 01:24:14, GigabitEthernet 0/1
O 192.168.6.0/24 [110/2] via 192.168.3.2, 00:01:01, GigabitEthernet 0/2
From the above information, we can see that the ABR in NSSA area has
translated the external routes imported by this area into N2 (OSPF NSSA external
type 2) routes for distributing into other areas.
Display the routing table of Switch D (ASBR)