redistribute connected是发布主网的地址 如果要发布的是主网中的子网的话将发布不进去
redistribute connected subnet是发布连主网中的子网也一起发布进去
redistribute connecte
R2(config)#int loopback 1
R2(config-if)#ip add 209.65.200.225 255.255.255.252
R2#sh run | b r o
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
redistribute connected
network 2.2.2.2 0.0.0.0 area 1
network 12.1.1.2 0.0.0.0 area 1
在R4上查看路由表
R4#sh ip route ospf
1.0.0.0/24 is subnetted, 1 subnets
O1.1.1.0 [110/65] via 145.1.1.1, 00:38:47, Serial1/2
2.0.0.0/32 is subnetted, 1 subnets
O IA2.2.2.2 [110/66] via 145.1.1.1, 00:38:47, Serial1/2
5.0.0.0/24 is subnetted, 1 subnets
O5.5.5.0 [110/65] via 45.1.1.5, 00:38:47, Serial1/3
145.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
O145.1.1.1/32 [110/64] via 145.1.1.1, 00:38:47, Serial1/2
O145.1.1.5/32 [110/64] via 45.1.1.5, 00:38:47, Serial1/3
O IA 12.0.0.0/8 [110/65] via 145.1.1.1, 00:38:47, Serial1/2
修改R2的loopback 1的IP地址为209.65.200.225 255.255.255.0
R2(config)#int loopback 1
R2(config-if)#ip add 209.65.200.225 255.255.255.0
在R4上再次查看路由表，发现有外部路由出现
R4#sh ip route ospf
1.0.0.0/24 is subnetted, 1 subnets
O 1.1.1.0 [110/65] via 145.1.1.1, 00:41:20, Serial1/2
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.2 [110/66] via 145.1.1.1, 00:41:20, Serial1/2
5.0.0.0/24 is subnetted, 1 subnets
O 5.5.5.0 [110/65] via 45.1.1.5, 00:41:20, Serial1/3
145.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
O 145.1.1.1/32 [110/64] via 145.1.1.1, 00:41:20, Serial1/2
O 145.1.1.5/32 [110/64] via 45.1.1.5, 00:41:20, Serial1/3
O E2 209.65.200.0/24 [110/20] via 145.1.1.1, 00:00:02, Serial1/2
O IA 12.0.0.0/8 [110/65] via 145.1.1.1, 00:41:20, Serial1/2
redistribute connected subnet
R2(config)#int loopback 1
R2(config-if)#ip add 209.65.200.225 255.255.255.252
R2(config-router)#redistribute connected subnets
在R4上查看路由表，发现已经有外部路由出现
R4#sh ip route ospf
1.0.0.0/24 is subnetted, 1 subnets
O 1.1.1.0 [110/65] via 145.1.1.1, 00:44:00, Serial1/2
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.2 [110/66] via 145.1.1.1, 00:44:00, Serial1/2
5.0.0.0/24 is subnetted, 1 subnets
O 5.5.5.0 [110/65] via 45.1.1.5, 00:44:00, Serial1/3
145.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
O 145.1.1.1/32 [110/64] via 145.1.1.1, 00:44:00, Serial1/2
O 145.1.1.5/32 [110/64] via 45.1.1.5, 00:44:00, Serial1/3
209.65.200.0/30 is subnetted, 1 subnets
O E2 209.65.200.224 [110/20] via 145.1.1.1, 00:00:57, Serial1/2
O IA 12.0.0.0/8 [110/65] via 145.1.1.1, 00:44:00, Serial1/2
因为225的二进制表示为11100001，由于子网掩码是255.255.255.252，也就是前面30位，所以进入路由表示只显示209.65.200.224