R1#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0 2.0.0.0/24 is subnetted, 1 subnets O IA 2.2.2.0 [110/192] via 1.1.1.2, 00:01:15, Serial0/0 3.0.0.0/32 is subnetted, 1 subnets O IA 3.3.3.3 [110/129] via 1.1.1.2, 00:09:15, Serial0/0 4.0.0.0/24 is subnetted, 1 subnets O IA 4.4.4.0 [110/192] via 1.1.1.2, 00:04:43, Serial0/0 172.16.0.0/24 is subnetted, 1 subnets O IA 172.16.1.0 [110/128] via 1.1.1.2, 00:09:15, Serial0/0======================================
R1:
router ospf 1
distribute-list 1 in ! access-list 1 deny 2.2.2.0 0.0.0.255 access-list 1 deny 3.3.3.0 0.0.0.255 access-list 1 permit any======================================
R1#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0 4.0.0.0/24 is subnetted, 1 subnets O IA 4.4.4.0 [110/192] via 1.1.1.2, 00:00:28, Serial0/0 172.16.0.0/24 is subnetted, 1 subnets O IA 172.16.1.0 [110/128] via 1.1.1.2, 00:00:28, Serial0/0R1#sh ip ospf database （已阻止2.2.2.2与3.3.3.3进入路由，但仍在数据库中找到）
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 678 0x80000003 0x00A8E2 2 2.2.2.2 2.2.2.2 1392 0x80000002 0x004D39 2Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 204 0x80000001 0x000AA4 3.3.3.3 2.2.2.2 1333 0x80000001 0x004F984.4.4.0 2.2.2.2 412 0x80000001 0x00C1E6 172.16.1.0 2.2.2.2 1388 0x80000001 0x003FF7
另一种配置
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R1:
router ospf 1
distribute-list filter-ospf in ! ip access-list standard filter-ospf deny 2.2.2.0 0.0.0.255 deny 3.3.3.0 0.0.0.255 permit any