I was doing Section 5, however I have a bit of problem with Section 10, in fact I`am almost sure that I should use NSSA Area, neverthless on R7 I can stil ping external Net. The strange thing which in Database I haven`t any Summary Net.I bolded key point Straightforward the config. Any idea? R7#pi 172.9.4.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.9.4.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 100/101/104 ms R7#sh ip route 172.9.4.9 Routing entry for 172.9.4.0/24 Known via "ospf 1", distance 110, metric 181, type extern 1 Last update from 150.50.57.5 on FastEthernet0/0, 00:02:28 ago Routing Descriptor Blocks: * 150.50.57.5, from 9.9.9.9, 00:02:28 ago, via FastEthernet0/0 Route metric is 181, traffic share count is 1 R7#sh ip os da da OSPF Router with ID (7.7.7.7) (Process ID 1) Area 0 database summary LSA Type Count Delete Maxage Router 6 0 0 Network 1 0 0 Summary Net 32 0 0 Summary ASBR 1 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 40 0 0 Area 57 database summary LSA Type Count Delete Maxage Router 2 0 0 Network 1 0 0 Summary Net 22 0 0 Summary ASBR 3 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 28 0 0 Area 78 database summary LSA Type Count Delete Maxage Router 2 0 0 Network 0 0 0 Summary Net 21 0 0 Summary ASBR 0 0 0 Type-7 Ext 1 0 0 Prefixes redistributed in Type-7 0 Opaque Link 0 0 0 Opaque Area 0 0 0 Subtotal 24 0 0 Process 1 database summary LSA Type Count Delete Maxage Router 10 0 0 Network 2 0 0 Summary Net 75 0 0 Summary ASBR 4 0 0 Type-7 Ext 1 0 0 Opaque Link 0 0 0 Opaque Area 0 0 0 Type-5 Ext 5 0 0 Prefixes redistributed in Type-5 0 Opaque AS 0 0 0 Total 97 0 0 R7#sh 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 not set 51.0.0.0/32 is subnetted, 1 subnets O 51.5.5.5 [110/2] via 150.50.57.5, 00:02:55, FastEthernet0/0 1.0.0.0/32 is subnetted, 1 subnets O IA 1.1.1.1 [110/67] via 150.50.57.5, 00:02:55, FastEthernet0/0 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/66] via 150.50.57.5, 00:02:55, FastEthernet0/0 71.0.0.0/24 is subnetted, 1 subnets C 71.7.7.0 is directly connected, Loopback1 81.0.0.0/32 is subnetted, 1 subnets O 81.8.8.8 [110/65] via 150.50.78.8, 00:03:06, Serial0/0/0 4.0.0.0/32 is subnetted, 1 subnets O IA 4.4.4.4 [110/130] via 150.50.57.5, 00:02:56, FastEthernet0/0 20.0.0.0/32 is subnetted, 1 subnets O IA 20.2.2.2 [110/66] via 150.50.57.5, 00:02:57, FastEthernet0/0 5.0.0.0/32 is subnetted, 1 subnets O IA 5.5.5.5 [110/2] via 150.50.57.5, 00:02:57, FastEthernet0/0 6.0.0.0/32 is subnetted, 1 subnets O IA 6.6.6.6 [110/130] via 150.50.57.5, 00:02:57, FastEthernet0/0 172.4.0.0/32 is subnetted, 4 subnets O IA 172.4.0.4 [110/130] via 150.50.57.5, 00:02:57, FastEthernet0/0 O IA 172.4.1.4 [110/130] via 150.50.57.5, 00:02:57, FastEthernet0/0 O IA 172.4.2.4 [110/130] via 150.50.57.5, 00:02:57, FastEthernet0/0 O IA 172.4.3.4 [110/130] via 150.50.57.5, 00:02:57, FastEthernet0/0 172.9.0.0/24 is subnetted, 4 subnets O E1 172.9.5.0 [110/181] via 150.50.57.5, 00:02:47, FastEthernet0/0 O E1 172.9.4.0 [110/181] via 150.50.57.5, 00:02:47, FastEthernet0/0 O E1 172.9.7.0 [110/181] via 150.50.57.5, 00:02:47, FastEthernet0/0 O E1 172.9.6.0 [110/181] via 150.50.57.5, 00:02:47, FastEthernet0/0 7.0.0.0/24 is subnetted, 1 subnets C 7.7.7.0 is directly connected, Loopback0 8.0.0.0/32 is subnetted, 1 subnets O 8.8.8.8 [110/65] via 150.50.78.8, 00:03:08, Serial0/0/0 9.0.0.0/32 is subnetted, 1 subnets O 9.9.9.9 [110/162] via 150.50.57.5, 00:02:58, FastEthernet0/0 10.0.0.0/32 is subnetted, 1 subnets O 10.1.1.1 [110/67] via 150.50.57.5, 00:02:58, FastEthernet0/0 61.0.0.0/32 is subnetted, 1 subnets O 61.6.6.6 [110/130] via 150.50.57.5, 00:02:59, FastEthernet0/0 150.50.0.0/16 is variably subnetted, 9 subnets, 3 masks O IA 150.50.246.0/24 [110/129] via 150.50.57.5, 00:02:59, FastEthernet0/0 C 150.50.57.0/25 is directly connected, FastEthernet0/0 O IA 150.50.1.0/24 [110/67] via 150.50.57.5, 00:02:59, FastEthernet0/0 O 150.50.12.0/24 [110/66] via 150.50.57.5, 00:02:59, FastEthernet0/0 O N1 150.50.8.0/24 [110/85] via 150.50.78.8, 00:02:49, Serial0/0/0 O IA 150.50.25.0/24 [110/65] via 150.50.57.5, 00:02:59, FastEthernet0/0 O 150.50.69.0/24 [110/161] via 150.50.57.5, 00:02:59, FastEthernet0/0 C 150.50.78.8/32 is directly connected, Serial0/0/0 C 150.50.78.0/24 is directly connected, Serial0/0/0 R7# -- This message is intended for the individual(s) to whom it is addressed and may contain information that is privileged or confidential. 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