O IA 3.3.3.3 [110/21] via 192.168.25.2, 00:00:02, FastEthernet0/0
C 192.168.25.0/24 is directly connected, FastEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/31] via 192.168.25.2, 00:00:03, FastEthernet0/0
5.0.0.0/32 is subnetted, 1 subnets
C 5.5.5.5 is directly connected, Loopback0
6.0.0.0/32 is subnetted, 1 subnets
O IA 6.6.6.6 [110/31] via 192.168.25.2, 00:00:03, FastEthernet0/0
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.0.0 is directly connected, Loopback1
C 172.16.1.0 is directly connected, Loopback1
C 172.16.2.0 is directly connected, Loopback1
C 172.16.3.0 is directly connected, Loopback1
O IA 192.168.36.0/24 [110/30] via 192.168.25.2, 00:00:03, FastEthernet0/0
这时发现没有默认路由，需运行以下命令：
R2(config-router)#area 1 nssa default-information-originate
