这是一个设计到rip和ospf的双点、双向从发布的负载均衡实验，拓扑图如下：
配置任务：
1. 配置R3，R5双点双向重分发，使R4学到的RIP网络负载均衡。 2. 配置R4学习到1.1.1.1/24的路由优先走R3。 配置详情：
如上的配置任务中1有2种配置方法：
1. 通过分发列表来实现； 2. 通过修改AD值来实现； 下面分别讲解2种配置方法：
没有配置2种方法前，各路由器的路由表：
配置参数：
R3:
router ospf 1
redistribute rip metric 40 subnets
network 192.168.34.0 0.0.0.255 area 0
router rip
version 2
redistribute ospf 1 metric 5
network 192.168.23.0
no auto-summary
R5:
router ospf 1
redistribute rip metric 40 subnets
network 192.168.45.0 0.0.0.255 area 0
router rip
version 2
redistribute ospf 1 metric 5
network 192.168.25.0
no auto-summary
R1:
r1#SH IP ROU
C 192.168.12.0/24 is directly connected, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback1
R 192.168.45.0/24 [120/6] via 192.168.12.2, 00:00:06, Serial0/0
R 192.168.25.0/24 [120/1] via 192.168.12.2, 00:00:06, Serial0/0
R 192.168.23.0/24 [120/1] via 192.168.12.2, 00:00:06, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
C 11.11.11.0 is directly connected, Loopback11
R 192.168.34.0/24 [120/6] via 192.168.12.2, 00:00:06, Serial0/0
r1#
R2:
r2#sh ip rou
C 192.168.12.0/24 is directly connected, Serial0/2
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/1] via 192.168.12.1, 00:00:03, Serial0/2
R 192.168.45.0/24 [120/5] via 192.168.25.1, 00:00:00, Serial0/0
[120/5] via 192.168.23.1, 00:00:15, Serial0/1
C 192.168.25.0/24 is directly connected, Serial0/0
C 192.168.23.0/24 is directly connected, Serial0/1
11.0.0.0/24 is subnetted, 1 subnets
R 11.11.11.0 [120/1] via 192.168.12.1, 00:00:03, Serial0/2
R 192.168.34.0/24 [120/5] via 192.168.25.1, 00:00:00, Serial0/0
[120/5] via 192.168.23.1, 00:00:16, Serial0/1
r2#
R3:
r3#sh ip rou
R 192.168.12.0/24 [120/1] via 192.168.23.2, 00:00:04, Serial0/1
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/2] via 192.168.23.2, 00:00:04, Serial0/1
O 192.168.45.0/24 [110/128] via 192.168.34.2, 00:37:41, Serial0/0
O E2 192.168.25.0/24 [110/40] via 192.168.34.2, 00:37:41, Serial0/0
C 192.168.23.0/24 is directly connected, Serial0/1
11.0.0.0/24 is subnetted, 1 subnets
R 11.11.11.0 [120/2] via 192.168.23.2, 00:00:04, Serial0/1
C 192.168.34.0/24 is directly connected, Serial0/0
r3#
R4:
r4#sh ip rou
O E2 192.168.12.0/24 [110/40] via 192.168.34.1, 00:38:00, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/40] via 192.168.34.1, 00:38:00, Serial0/0
C 192.168.45.0/24 is directly connected, Serial0/1
O E2 192.168.25.0/24 [110/40] via 192.168.45.1, 00:38:00, Serial0/1
O E2 192.168.23.0/24 [110/40] via 192.168.34.1, 00:38:00, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [110/40] via 192.168.34.1, 00:38:00, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
r4#
可以看到R4是通过R3学习到RIP网络的路由的！！！
R5:
r5#sh ip rou
O E2 192.168.12.0/24 [110/40] via 192.168.45.2, 00:38:19, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/40] via 192.168.45.2, 00:38:19, Serial0/0
C 192.168.45.0/24 is directly connected, Serial0/0
C 192.168.25.0/24 is directly connected, Serial0/1
O E2 192.168.23.0/24 [110/40] via 192.168.45.2, 00:38:19, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [110/40] via 192.168.45.2, 00:38:19, Serial0/0
O 192.168.34.0/24 [110/128] via 192.168.45.2, 00:38:19, Serial0/0
r5#
可以看到R5是通过OSPF来学习RIP网络的路由的，这样产生了次优路由，解决方法如下：
方法一：
R3:
r3(config)#acc 1 de 1.1.1.0
r3(config)#acc 1 de 11.11.11.0
r3(config)#acc 1 per an
r3(config)#router os 1
r3(config-router)#distribute-list 1 in s0/0
R5:
r5(config)#acc 1 de 1.1.1.0
r5(config)#acc 1 de 11.11.11.0
r5(config)#acc 1 per an
r5(config)#router os 1
r5(config-router)#distribute-list 1 in s0/0
配置完这些R5的路由表就可以学到最优的路由了，R4学习到的RIP网络的路由也会实现负载均衡！！！效果如下：
R5:
r5#SH IP ROU
O E2 192.168.12.0/24 [110/40] via 192.168.45.2, 00:03:04, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/2] via 192.168.25.2, 00:00:09, Serial0/1
C 192.168.45.0/24 is directly connected, Serial0/0
C 192.168.25.0/24 is directly connected, Serial0/1
O E2 192.168.23.0/24 [110/40] via 192.168.45.2, 00:03:04, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
R 11.11.11.0 [120/2] via 192.168.25.2, 00:00:09, Serial0/1
O 192.168.34.0/24 [110/128] via 192.168.45.2, 00:03:04, Serial0/0
r5#
可以看到R5通过RIP学到了RIP网络的路由，避免了次优路由！！！
R4:
r4#sh ip rou
O E2 192.168.12.0/24 [110/40] via 192.168.34.1, 00:48:17, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/40] via 192.168.45.1, 00:04:06, Serial0/1
[110/40] via 192.168.34.1, 00:04:06, Serial0/0
C 192.168.45.0/24 is directly connected, Serial0/1
O E2 192.168.25.0/24 [110/40] via 192.168.45.1, 00:48:17, Serial0/1
O E2 192.168.23.0/24 [110/40] via 192.168.34.1, 00:48:17, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [110/40] via 192.168.45.1, 00:04:06, Serial0/1
[110/40] via 192.168.34.1, 00:04:06, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
r4#
可以看到R4学到的RIP网络的路由实现了负载均衡！！！
这个配置方法不是很好，因为如果我们把R3的连着RIP网络的接口s0/1关掉，这样R3就学习不到RIP网络的路由了，因为R3上面配置了分发列表，禁止R3从S0/0接口学习RIP网络的路由，测试效果如下：
R3：
r3(config)#int s 0/1
r3(config-if)#shutdown
r3#sh ip rou
O 192.168.45.0/24 [110/128] via 192.168.34.2, 00:09:33, Serial0/0
O E2 192.168.25.0/24 [110/40] via 192.168.34.2, 00:09:33, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
r3#
如上，这样R3就丢失了RIP网络的路由！！！下面这个配置方法可以很好的解决这个问题。即可以避免次优路由的产生，又可以适应网络的变化！！！
方法二：
先把R3和R5的分发列表删掉，也要把R3的S0/1接口开起来：
R3:
r3(config)#no acc 1
r3(config)#router os 1
r3(config-router)#no distrib 1 in s0/0
http://www.luyouqiwang.com/15382/ r3(config)#int s 0/1
r3(config-if)#no shutdown
R5:
r5(config)#no acc 1
r5(config)#router os 1
r5(config-router)#no distrib 1 in s0/0
下面配置第二种方法（修改路由AD值）：
注意：AD值到本地的路由起作用！！！
R3:
r3(config)#router os 1
r3(config-router)#distance 130 //配置重发布的AD值为130
r3(config)#acc 1 per 192.168.45.0 //关联OSPF内网路由
r3(config)#router os 1
r3(config-router)#distance 110 0.0.0.0 255.255.255.255 1
//配置OSPF内部路由的AD值保持110
R5:
r5(config)#router os 1
r5(config-router)#distance 130
r5(config-router)#acc 1 per 192.168.34.0
r5(config)#router os 1
r5(config-router)#distance 110 0.0.0.0 255.255.255.255 1
r5(config-router)#end
马上就可以看到R5通过RIP学习到RIP网络的路由！！！
r5#sh ip rou
R 192.168.12.0/24 [120/1] via 192.168.25.2, 00:00:06, Serial0/1
1.0.0.0/24 is subnetted, 1 subnets
R 1.1.1.0 [120/2] via 192.168.25.2, 00:00:06, Serial0/1
C 192.168.45.0/24 is directly connected, Serial0/0
C 192.168.25.0/24 is directly connected, Serial0/1
R 192.168.23.0/24 [120/1] via 192.168.25.2, 00:00:06, Serial0/1
11.0.0.0/24 is subnetted, 1 subnets
R 11.11.11.0 [120/2] via 192.168.25.2, 00:00:06, Serial0/1
O 192.168.34.0/24 [110/128] via 192.168.45.2, 00:00:05, Serial0/0
r5#
因为R5通过RIP学到的AD值为120，而刚刚在R5上设置的外部路由的AD值为130，路由器根据AD值小的优选进路由表！！！在R4也可以实现负载均衡：
R4：
r4#sh ip rou
O E2 192.168.12.0/24 [110/40] via 192.168.45.1, 00:07:26, Serial0/1
[110/40] via 192.168.34.1, 00:07:26, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/40] via 192.168.45.1, 00:07:26, Serial0/1
[110/40] via 192.168.34.1, 00:07:26, Serial0/0
C 192.168.45.0/24 is directly connected, Serial0/1
O E2 192.168.25.0/24 [110/40] via 192.168.45.1, 00:08:18, Serial0/1
[110/40] via 192.168.34.1, 00:08:18, Serial0/0
O E2 192.168.23.0/24 [110/40] via 192.168.45.1, 00:07:26, Serial0/1
[110/40] via 192.168.34.1, 00:07:26, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [110/40] via 192.168.45.1, 00:07:26, Serial0/1
[110/40] via 192.168.34.1, 00:07:26, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
r4#
而且现在把R3的S0/1关掉，R3也不会丢失RIP网络的路由，测试如下：
R3：
r3(config)#int s0/1
r3(config-if)#shutdown
r3#sh ip rou
O E2 192.168.12.0/24 [130/40] via 192.168.34.2, 00:16:12, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [130/40] via 192.168.34.2, 00:16:12, Serial0/0
O 192.168.45.0/24 [110/128] via 192.168.34.2, 00:25:51, Serial0/0
O E2 192.168.25.0/24 [130/40] via 192.168.34.2, 00:16:12, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [130/40] via 192.168.34.2, 00:16:12, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
r3#
可以看到R3通过OSPF学习到了RIP网络的路由，虽然这个是次优路由，但总比学习不到好吧！！！
接下来配置任务2.配置R4学习到1.1.1.1/24的路由优先走R3。
这个可以在重发布路由时，将度量值修改一下就可以实现这个功能，具体配置如下：
R3:
r3(config)#acc 2 per 1.1.1.0
r3(config)#route-ma rip_to_ospf 10
r3(config-route-map)#ma add 2
r3(config-route-map)#se me 30
r3(config)#route-ma rip_to_ospf 20
r3(config-route-map)#se me 40
r3(config-route-map)#router os 1
r3(config-router)#re rip rou
r3(config-router)#re rip route-map rip_to_ospf subnets
R5:
router ospf 1
redistribute rip metric 40 subnets
network 192.168.45.0 0.0.0.255 area 0
distance 130
distance 110 0.0.0.0 255.255.255.255 1
router rip
version 2
redistribute ospf 1 metric 5
network 192.168.25.0
no auto-summary
测试：
R4：
r4#sh ip rou
O E2 192.168.12.0/24 [110/40] via 192.168.45.1, 00:11:26, Serial0/1
[110/40] via 192.168.34.1, 00:11:26, Serial0/0
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/30] via 192.168.34.1, 00:09:20, Serial0/0
C 192.168.45.0/24 is directly connected, Serial0/1
O E2 192.168.25.0/24 [110/40] via 192.168.45.1, 00:11:26, Serial0/1
[110/40] via 192.168.34.1, 00:11:26, Serial0/0
O E2 192.168.23.0/24 [110/40] via 192.168.45.1, 00:11:42, Serial0/1
[110/40] via 192.168.34.1, 00:11:42, Serial0/0
11.0.0.0/24 is subnetted, 1 subnets
O E2 11.11.11.0 [110/40] via 192.168.45.1, 00:11:26, Serial0/1
[110/40] via 192.168.34.1, 00:11:26, Serial0/0
C 192.168.34.0/24 is directly connected, Serial0/0
可以看到R4学习到的1.1.1.0/24只有一条路径就是往R3走，而去往11.11.11.0/24有两条路径，可以往R3或R5走！！！以上的配置任务配置成功！ |
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