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标题: 路由协议迁移（EIGRP—OSPF）实验实例 [查看完整版帖子] [打印本页]

时间: 2015-12-15 15:39

作者: steftdance 标题: 路由协议迁移（EIGRP—OSPF）实验实例

路由协议迁移

RT1、RT2、RT3上运行EIGRP路由协议，现因业务需要，需要改为运行OSPF路由协议，要求不能影响全网连通性。

拓扑如下：

EIGRP配置：

RT1

router eigrp 1

network 1.1.1.1 0.0.0.0

network 192.168.1.0 0.0.0.3

network 192.168.1.4 0.0.0.3

no auto-summary

eigrp router-id 1.1.1.1

RT2

router eigrp 1

network 2.2.2.2 0.0.0.0

network 192.168.1.0 0.0.0.3

noauto-summary

eigrp router-id 2.2.2.2

RT3

router eigrp 1

network 3.3.3.3 0.0.0.0

network 192.168.1.4 0.0.0.3

noauto-summary

eigrp router-id 3.3.3.3

查看EIGRP邻居：

RT1#showip eigrp neighbors

IP-EIGRPneighbors for process 1

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

1 192.168.1.6 Se0/1 12 00:05:09 125 750 0 18

0 192.168.1.2 Se0/0 13 00:05:29 63 378 0 20

在RT1、RT2、RT3上查看路由表：

RT1#showip route

1.0.0.0/32 is subnetted, 1 subnets

C 1.1.1.1 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

D 2.2.2.2[90/2297856] via 192.168.1.2, 00:13:53, Serial0/0

3.0.0.0/32 is subnetted,1 subnets

D 3.3.3.3[90/2297856] via 192.168.1.6, 00:13:38, Serial0/1

192.168.1.0/30 issubnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

C 192.168.1.4 is directly connected,Serial0/1

RT2# showip route

1.0.0.0/32 is subnetted, 1 subnets

D 1.1.1.1[90/2297856] via 192.168.1.1, 00:13:29, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

C 2.2.2.2 is directly connected, Loopback0

3.0.0.0/32 issubnetted, 1 subnets

D 3.3.3.3[90/2809856] via 192.168.1.1, 00:13:46, Serial0/0

192.168.1.0/30 is subnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

D 192.168.1.4[90/2681856] via 192.168.1.1, 00:21:54, Serial0/0

RT3#showip route

1.0.0.0/32 issubnetted, 1 subnets

D 1.1.1.1[90/2297856] via 192.168.1.5, 00:13:36, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

D 2.2.2.2[90/2809856] via 192.168.1.5, 00:14:08, Serial0/0

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

192.168.1.0/30 is subnetted, 2 subnets

D 192.168.1.0[90/2681856] via 192.168.1.5, 00:19:16, Serial0/0

C 192.168.1.4 is directly connected,Serial0/0

此时都为D的路由，即EIGRP的路由。

配上OSPF路由进程：

RT1

router ospf 1

router-id 1.1.1.1

log-adjacency-changes

network 1.1.1.1 0.0.0.0 area 0

network 192.168.1.0 0.0.0.3 area 0

network 192.168.1.4 0.0.0.3 area 0

RT2

router ospf 1

router-id 2.2.2.2

log-adjacency-changes

network 2.2.2.2 0.0.0.0 area 0

network 192.168.1.0 0.0.0.3 area 0

RT3

router ospf 1

router-id 3.3.3.3

log-adjacency-changes

network 3.3.3.3 0.0.0.0 area 0

network 192.168.1.4 0.0.0.3 area 0

可以看到OSPF邻居：

RT1#showip ospf neighbor

NeighborID Pri State Dead Time Address Interface

3.3.3.3 0 FULL/ - 00:00:32 192.168.1.6 Serial0/1

2.2.2.2 0 FULL/ - 00:00:29 192.168.1.2 Serial0/0

OSPF的邻居状态为FULL，链路状态信息也完成同步。

但路由表不会发生变化：

RT2# showip route

1.0.0.0/32 issubnetted, 1 subnets

D 1.1.1.1[90/2297856] via 192.168.1.1, 00:13:29, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

C 2.2.2.2 is directly connected, Loopback0

3.0.0.0/32 issubnetted, 1 subnets

D 3.3.3.3[90/2809856] via 192.168.1.1, 00:13:46, Serial0/0

192.168.1.0/30 is subnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

D 192.168.1.4[90/2681856] via 192.168.1.1, 00:21:54, Serial0/0

因为OSPF的AD值（110）大于EIGRP内部AD值（90），根据路由选择原则，在路由表中无法看到OSPF的路由。

路由协议迁移的方法：可将EIGRP的AD值改大且大于OSPF的AD值，即可使OSPF的路由出现在全局路由表中。

修改EIGRP的AD值：

RT1、RT2、RT3：

router eigrp 1

distance eigrp 130 200

在修改的过程中，查看RT3的路由表。

RT3#showip route

D 1.1.1.1[90/2297856] via 192.168.1.5, 00:00:05, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/129] via 192.168.1.5,00:00:09, Serial0/0

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

192.168.1.0/30 is subnetted, 2 subnets

D 192.168.1.0[90/2681856] via 192.168.1.5, 00:00:05, Serial0/0

C 192.168.1.4 is directly connected,Serial0/0

在RT3上可以看到D和O的路由，表示路由协议正在进行切换。

一段时间之后，在RT1、RT2、RT3查看路由表：

RT1#showip route

1.0.0.0/32 is subnetted, 1 subnets

C 1.1.1.1 is directly connected, Loopback0

2.0.0.0/32 issubnetted, 1 subnets

O 2.2.2.2[110/65] via 192.168.1.2, 00:00:29, Serial0/0

3.0.0.0/32 issubnetted, 1 subnets

O 3.3.3.3[110/65] via 192.168.1.6, 00:00:29, Serial0/1

192.168.1.0/30 is subnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

C 192.168.1.4 is directly connected, Serial0/1

RT2#showip route

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1[110/65] via 192.168.1.1, 00:00:20, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

C 2.2.2.2 is directly connected, Loopback0

3.0.0.0/32 is subnetted, 1 subnets

O 3.3.3.3[110/129] via 192.168.1.1, 00:00:36, Serial0/0

192.168.1.0/30 is subnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

O 192.168.1.4[110/128] via 192.168.1.1, 00:00:20, Serial0/0

RT3#showip route

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1[110/65] via 192.168.1.5, 00:00:11, Serial0/0

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2[110/129] via 192.168.1.5, 00:00:43, Serial0/0

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

192.168.1.0/30 is subnetted, 2 subnets

O 192.168.1.0[110/128] via 192.168.1.5, 00:00:11, Serial0/0

C 192.168.1.4 is directly connected,Serial0/0

路由表中只有O的路由，表示路由协议已经切换完成。此过程中并没有影响全网连通性，因为D和O路由都有自己本身的路由表，进入全局路由表是根据路由选择条件来进入的。

在RT1、RT2、RT3将EIGRP的进程删除：

配置

no router eigrp 1

在RT1上看到如下信息：

RT1(config)#norouter eigrp 1

*Mar 1 00:49:58.011: %DUAL-5-NBRCHANGE:IP-EIGRP(0) 1: Neighbor 192.168.1.2 (Serial0/0) is down: interface down

*Mar 1 00:49:58.051: %DUAL-5-NBRCHANGE:IP-EIGRP(0) 1: Neighbor 192.168.1.6 (Serial0/1) is down: interface down

显示EIGRP的邻居down。查看邻居，显示为空：

RT1#showip eigrp neighbors

再查看路由表，路由表正常：

RT1#showip route

1.0.0.0/32 is subnetted, 1 subnets

C 1.1.1.1 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2[110/65] via 192.168.1.2, 00:01:17, Serial0/0

3.0.0.0/32 issubnetted, 1 subnets

O 3.3.3.3[110/65] via 192.168.1.6, 00:01:17, Serial0/1

192.168.1.0/30 is subnetted, 2 subnets

C 192.168.1.0 is directly connected,Serial0/0

C 192.168.1.4 is directly connected,Serial0/1

删除EIGRP的进程的过程中也不会影响全网的连通性。

完成了路由协议的迁移，由EIGRP迁移到OSPF，并没有影响全网连通性。

总结：

路由协议迁移可通过修改协议的AD值来改变其进入全局路由表的顺序，从而可以删除，来达到路由协议迁移的目的。

在迁移过程中，要等进入全局路由表的路由协议的信息达到同步之后，并且在路由表中学到了所有的路由，才可删除没有进入全局路由表的路由协议的配置。

附件: 路由协议迁移.doc (2015-12-15 15:38, 91.5 KB) / 下载次数 7
https://www.txrjy.com/forum.php?mod=attachment&aid=Mjc0ODczfDU2ZTM3NDJmfDE3NTM0NTQ4NTZ8MHww

时间: 2016-3-9 00:50

作者: daisyw89

时间: 2018-5-23 16:22

作者: gaoleizi1986

非常感谢，项目正好需要，学习一下啊

时间: 2021-9-24 14:33

作者: darcy_wu

感谢分享，下载学习

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