交换路由CCIE之路——路由策略
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
实验路由策略
一实验拓扑图1
实验一
实验要求：原本网络使用EIGRP现在要求用OSPF来发现网络拓扑。
实验分析：要是网络平滑过渡可先将OSPF配置好，然后理由改变EIGRP的管理距离使OSPF替换EIGRP进路由表，等到全网为OSPF后，去掉EIGRP.
实验操作及结果：首先全网为EIGRP如下
r1#show ip route
192.168.12.0/30 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
D 192.168.23.0 [90/2681856] via 192.168.12.2, 00:01:48, Serial0/0
C 192.168.1.0/24 is directly connected, Ethernet3/0
D 192.168.3.0/24 [90/2707456] via 192.168.12.2, 00:00:13, Serial0/0
r2#show ip route
192.168.12.0/30 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
C 192.168.23.0 is directly connected, Serial0/2
D 192.168.1.0/24 [90/2195456] via 192.168.12.1, 00:02:56, Serial0/0 D 192.168.3.0/24 [90/2195456] via 192.168.23.2, 00:01:16, Serial0/2 r3#show ip route
192.168.12.0/30 is subnetted, 1 subnets
D 192.168.12.0 [90/2681856] via 192.168.23.1, 00:01:21, Serial0/0 192.168.23.0/30 is subnetted, 1 subnets
C 192.168.23.0 is directly connected, Serial0/0
D 192.168.1.0/24 [90/2707456] via 192.168.23.1, 00:01:21, Serial0/0 C 192.168.3.0/24 is directly connected, Ethernet3/0
现在在每个路由器都配置OSPF能发现都建立邻居，但没进路由表r1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface 192.168.23.1 0 FULL/ - 00:00:32 192.168.12.2 Serial0/0 r2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface 192.168.23.2 0 FULL/ - 00:00:35 192.168.23.2 Serial0/2 192.168.12.1 0 FULL/ - 00:00:31 192.168.12.1 Serial0/0 r3#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface 192.168.23.1 0 FULL/ - 00:00:32 192.168.23.1 Serial0/0 r1#show ip route
192.168.12.0/30 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
D 192.168.23.0 [90/2681856] via 192.168.12.2, 00:01:48, Serial0/0
C 192.168.1.0/24 is directly connected, Ethernet3/0
D 192.168.3.0/24 [90/2707456] via 192.168.12.2, 00:00:13, Serial0/0
192.168.12.0/30 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
C 192.168.23.0 is directly connected, Serial0/2
D 192.168.1.0/24 [90/2195456] via 192.168.12.1, 00:02:56, Serial0/0
D 192.168.3.0/24 [90/2195456] via 192.168.23.2, 00:01:16, Serial0/2
r3#show ip route
192.168.12.0/30 is subnetted, 1 subnets
D 192.168.12.0 [90/2681856] via 192.168.23.1, 00:01:21, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
C 192.168.23.0 is directly connected, Serial0/0
D 192.168.1.0/24 [90/2707456] via 192.168.23.1, 00:01:21, Serial0/0
C 192.168.3.0/24 is directly connected, Ethernet3/0
主要原因是OSPF管理距离比EIGRP大，所以没有进入路由表，这时候将EIGRP的管理距离加大到120，这时候路由表就发生改变了，但EIGRP邻居依然存在
r1(config)#router eigrp 10
r1(config-router)#distance eigrp 120 170 //将eigrp内部管理距离改为120>110
r1(config-router)#exit
r2(config)#router eigrp 10
r2(config-router)#distance eigrp 120 170
r3(config)#router eigrp 10
r3(config-router)#distance eigrp 120 170
r3(config-router)#exit
重新查看路由表，发现OSPF进了路由表
r1#show ip route
192.168.12.0/30 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial0/0
192.168.23.0/30 is subnetted, 1 subnets
O 192.168.23.0 [110/128] via 192.168.12.2, 00:03:18, Serial0/0
C 192.168.1.0/24 is directly connected, Ethernet3/0
O 192.168.3.0/24 [110/138] via 192.168.12.2, 00:03:18, Serial0/0