从EIGRP到OSPF的平滑过渡
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 全网初始使用的路由协议为EIGRP，现要求全网启用OSPF，实现EIGRP到OSPF的平滑过度。但R2 R3的1.1.23.0/24网段仍使用EIGRP。
初始配置
R1 conf t int l 0 ip ad 1.1.1.1 255.255.255.0 int s 0 ip ad 1.1.11.1 255.255.255.0 encap f no arp f no frame inv frame map ip 1.1.11.2 102 b frame map ip 1.1.11.3 103 b no shut int s 1 ip ad 1.1.14.1 255.255.255.0 no shut router eigrp 1 net 1.0.0.0 end R2
conf t int l 0 ip ad 1.1.2.2 255.255.255.0 int s 0 ip ad 1.1.11.2 255.255.255.0 encap f no arp f no frame inv frame map ip 1.1.11.1 201 b frame map ip 1.1.11.3 201 b no shut int s 1 ip ad 1.1.23.2 255.255.255.0 router eigrp 1 net 1.0.0.0 end R3
ocnf t int l 0 ip ad 1.1.3.3 255.255.255.0 int s0 ip ad 1.1.11.3 255.255.255.0 encap f no arp f no frame inver frame map ip 1.1.11.1 301 b frame map ip 1.1.11.2 301 b no shut int s 1 ip ad 1.1.23.3 255.255.255.0 clock rate 64000 no shut router eigrp 1 net 1.0.0.0 end R4 conf t int l 0 ip ad 1.1.4.4 255.255.255.0 int s 1 ip ad 1.1.14.4 255.255.255.0 clock rate 64000 no shut router eigrp 1 net 1.0.0.0 end 这时各个路由器上的路由表状态为 R1#sh ip route 1.0.0.0/24 is subnetted, 7 subnets C 1.1.1.0 is directly connected, Loopback0 D 1.1.2.0 [90/2297856] via 1.1.11.2, 00:02:10, Serial0 D 1.1.3.0 [90/2297856] via 1.1.11.3, 00:02:10, Serial0 D 1.1.4.0 [90/2297856] via 1.1.14.4, 00:02:06, Serial1 C 1.1.11.0 is directly connected, Serial0 C 1.1.14.0 is directly connected, Serial1 D 1.1.23.0 [90/2681856] via 1.1.11.3, 00:02:10, Serial0 [90/2681856] via 1.1.11.2, 00:02:10, Serial0 R2#sh ip route
1.0.0.0/24 is subnetted, 7 subnets D 1.1.1.0 [90/2297856] via 1.1.11.1, 00:02:25, Serial0 C 1.1.2.0 is directly connected, Loopback0 D 1.1.3.0 [90/2297856] via 1.1.23.3, 00:03:00, Serial1 D 1.1.4.0 [90/2809856] via 1.1.11.1, 00:02:25, Serial0 C 1.1.11.0 is directly connected, Serial0 D 1.1.14.0 [90/2681856] via 1.1.11.1, 00:02:25, Serial0 C 1.1.23.0 is directly connected, Serial1 R3#sh ip route
1.0.0.0/24 is subnetted, 7 subnets D 1.1.1.0 [90/2297856] via 1.1.11.1, 00:02:37, Serial0 D 1.1.2.0 [90/2297856] via 1.1.23.2, 00:03:11, Serial1 C 1.1.3.0 is directly connected, Loopback0 D 1.1.4.0 [90/2809856] via 1.1.11.1, 00:02:37, Serial0 C 1.1.11.0 is directly connected, Serial0 D 1.1.14.0 [90/2681856] via 1.1.11.1, 00:02:37, Serial0 C 1.1.23.0 is directly connected, Serial1 R4#sh ip route
1.0.0.0/24 is subnetted, 7 subnets
D 1.1.1.0 [90/2297856] via 1.1.14.1, 00:03:16, Serial1 D 1.1.2.0 [90/2809856] via 1.1.14.1, 00:03:01, Serial1 D 1.1.3.0 [90/2809856] via 1.1.14.1, 00:03:01, Serial1 C 1.1.4.0 is directly connected, Loopback0 D 1.1.11.0 [90/2681856] via 1.1.14.1, 00:03:16, Serial1 C 1.1.14.0 is directly connected, Serial1 D 1.1.23.0 [90/3193856] via 1.1.14.1, 00:03:01, Serial1 第一步：在R1R2 R3R4上启用OSPF R1 conf t int l 0 ip ospf net point-to-point router ospf 1 net 1.1.1.1 0.0.0.0 a 0 net 1.1.11.1 0.0.0.0 a 0 net 1.1.14.1 0.0.0.0 a 0 end R2 conf t int l 0 ip ospf net point-to-point int s 0 ip ospf p 0 router ospf 1 net 1.1.2.2 0.0.0.0 a 0 net 1.1.11.2 0.0.0.0 a 0 nei 1.1.11.1 end R3 conf t int l 0 ip ospf net point-to-point int s 0 ip ospf p 0 router ospf 1 net 1.1.3.3 0.0.0.0 a 0 net 1.1.11.3 0.0.0.0 a 0 nei 1.1.11.1 end R4 conf t int l 0 ip ospf net point-to-poin router ospf 1 net 1.1.14.4 0.0.0.0 a 0 net 1.1.4.4 0.0.0.0 a 0 end 这时，查看路由表状态和初始是一样的，因为EIGRP（internal)的AD为90，OSPF的AD为110。  第五步：修改剩余EIGRP的配置
R2 conf t router eigrp 1 no au net 1.1.23.2 0.0.0.0 no net 1.0.0.0 end R3 conf t router eigrp 1 no au net 1.1.23.3 0.0.0.0 no net 1.0.0.0 end 到此，路由的平滑过渡完成，现在路由器上路由表的状态
 R4#sh ip route
1.0.0.0/24 is subnetted, 7 subnets O 1.1.1.0 [110/65] via 1.1.14.1, 00:07:35, Serial1 O 1.1.2.0 [110/129] via 1.1.14.1, 00:07:35, Serial1 O 1.1.3.0 [110/129] via 1.1.14.1, 00:07:35, Serial1 C 1.1.4.0 is directly connected, Loopback0 O 1.1.11.0 [110/128] via 1.1.14.1, 00:07:35, Serial1 C 1.1.14.0 is directly connected, Serial1 O E1 1.1.23.0 [110/228] via 1.1.14.1, 00:04:52, Serial1 本文出自 “穿过地狱去看海” 博客，谢绝转载！ 本文出自 51CTO.COM技术博客 |
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