passive-interface用于OSPF的作用

设置命令passive-interface后接口将不在建立邻居关系,也不再发送和接收路由信息。

R1的配置:
interface Loopback1
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback2
 ip address 1.1.2.1 255.255.255.255
!
interface Serial1/1
 ip address 10.0.1.1 255.255.255.0
 serial restart-delay 0
!
router ospf 1
 router-id 1.1.1.1                             //设置路由器ID
 log-adjacency-changes                         //宣告直连网络
 network 1.1.1.0 0.0.0.255 area 0
 network 1.1.2.0 0.0.0.255 area 0
 network 10.0.1.0 0.0.0.255 area 0
R2的配置:
interface Loopback1
 ip address 2.2.2.2 255.255.255.255
!
interface Serial1/0
 ip address 10.0.1.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 10.0.2.1 255.255.255.0
 serial restart-delay 0
!
router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
 network 2.2.2.0 0.0.0.255 area 0
 network 10.0.1.0 0.0.0.255 area 0
 network 10.0.2.0 0.0.0.255 area 0
!
R3的配置:
interface Loopback1
 ip address 3.3.3.3 255.255.255.255
!
interface Serial1/0
 ip address 10.0.2.2 255.255.255.0
 serial restart-delay 0
router ospf 1
 log-adjacency-changes
 network 10.0.2.0 0.0.0.255 area 0
 network 3.3.3.0 0.0.0.255 area 0
!       
上述基本命令配置完成后查看R3的路由表和R1的邻居关系如下:
R3#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 not set
     1.0.0.0/32 is subnetted, 2 subnets
O       1.1.1.1 [110/129] via 10.0.2.1, 00:00:02, Serial1/0
O       1.1.2.1 [110/129] via 10.0.2.1, 00:00:02, Serial1/0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.0.2.1, 00:00:02, Serial1/0
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback1
     10.0.0.0/24 is subnetted, 2 subnets
C       10.0.2.0 is directly connected, Serial1/0
O       10.0.1.0 [110/128] via 10.0.2.1, 00:00:02, Serial1/0
OSPF网络中的所有路由都学到了
R1#show ip ospf neighbors       //查看R1的邻居
Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           0   FULL/  –        00:00:38    10.0.1.2        Serial1/1
在路由器R1上配置如下命令:
R1(config)#router ospf 1
R1(config-router)#passive-interface s1/1  
再次查看R3的路由表如下:
R3#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 not set
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.0.2.1, 00:00:02, Serial1/0
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback1
     10.0.0.0/24 is subnetted, 2 subnets
C       10.0.2.0 is directly connected, Serial1/0
O       10.0.1.0 [110/128] via 10.0.2.1, 00:00:02, Serial1/0
1.1.1.0 和 1.1.2.0路由条目不见了,R1的邻居也没了。

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