解决OSPF Area0 被分割问题 
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 解决方法也是采用虚链路
最初的配置
r1 配置
router>en
router#conf t router(config)#host r1 r1(config)#ena sec 123 r1(config)#no ip domain-lookup r1(config)#ban mot #Welcome to r1# r1(config)#line vty 0 4 r1(config-line)#no login r1(config-line)#line con 0 r1(config-line)#no exec-timeout r1(config-if)#int lo0 r1(config-if)#ip add 1.1.1.1 255.255.255.255 r1(config-if)#int f 0/0 r1(config-if)#des link to r2 r1(config-if)#ip add 192.168.1.1 255.255.255.0 r1(config-if)#no shut r1(config-if)#int f 1/0 r1(config-if)#des link to r3 r1(config-if)#ip add 192.168.2.1 255.255.255.0 r1(config-if)#no shut r1(config-if)#router ospf 1 r1(config-router)#router-id 1.1.1.1 r1(config-router)#net 192.168.1.0 0.0.0.255 area 1 r1(config-router)#net 192.168.2.0 0.0.0.255 area 0 r1(config-router)#end r1# r2 配置
router>en
router#conf t router(config)#host r2 r2(config)#ena sec 123 r2(config)#no ip domain-lookup r2(config)#ban mot #Welcome to r2# r2(config)#line vty 0 4 r2(config-line)#no login r2(config-line)#line con 0 r2(config-line)#no exec-timeout r2(config-if)#int lo0 r2(config-if)#des router-id r2(config-if)#ip add 2.2.2.2 255.255.255.255 r2(config-if)#int f 0/0 r2(config-if)#des link to r1 r2(config-if)#ip add 192.168.1.2 255.255.255.0 r2(config-if)#no shut r2(config-if)#int f 1/0 r2(config-if)#des link to r4 r2(config-if)#ip add 192.168.3.1 255.255.255.0 r2(config-if)#no shut r2(config-if)#router ospf 1 r2(config-router)#router-id 2.2.2.2 r2(config-router)#net 192.168.1.0 0.0.0.255 area 1 r2(config-router)#net 192.168.3.0 0.0.0.255 area 0 r2(config-router)#end r2# r3 配置
router>en
router#conf t router(config)#host r3 r3(config)#ena sec 123 r3(config)#no ip domain-lookup r3(config)#ban mot #Welcome to r3# r3(config)#line vty 0 4 r3(config-line)#no login r3(config-line)#line con 0 r3(config-line)#no exec-timeout r3(config-if)#int lo0 r3(config-if)#ip add 3.3.3.3 255.255.255.255 r3(config-if)#des router-id r3(config-if)#int f 0/0 r3(config-if)#des link to r1 r3(config-if)#ip add 192.168.2.2 255.255.255.0 r3(config-if)#no shut r3(config-if)#int f 1/0 r3(config-if)#des link to r5 r3(config-if)#ip add 192.168.4.1 255.255.255.0 r3(config-if)#no shut r3(config-if)#router ospf 1 r3(config-router)#router-id 3.3.3.3 r3(config-router)#net 192.168.2.0 0.0.0.255 area 0 r3(config-router)#net 192.168.4.0 0.0.0.255 area 2 r3(config-router)#end r3# r4 配置
router>en
router#conf t router(config)#host r4 r4(config)#ena sec 123 r4(config)#no ip domain-lookup r4(config)#ban mot #Welcome to r4# r4(config)#line vty 0 4 r4(config-line)#no login r4(config-line)#line con 0 r4(config-line)#no exec-timeout r4(config-if)#int lo0 r4(config-if)#des router-id r4(config-if)#ip add 4.4.4.4 255.255.255.255 r4(config-if)#int f 0/0 r4(config-if)#des link to r2 r4(config-if)#ip add 192.168.3.2 255.255.255.0 r4(config-if)#no shut r4(config-if)#int f 1/0 r4(config-if)#des link to r6 r4(config-if)#ip add 192.168.5.1 255.255.255.0 r4(config-if)#no shut r4(config-if)#router ospf 1 r4(config-router)#router-id 4.4.4.4 r4(config-router)#net 192.168.3.0 0.0.0.255 area 0 r4(config-router)#net 192.168.5.0 0.0.0.255 area 3 r4(config-router)#end r4# r5 配置
router>en
router#conf t router(config)#host r5 r5(config)#ena sec 123 r5(config)#no ip domain-lookup r5(config)#ban mot #Welcome to r5# r5(config)#line vty 0 4 r5(config-line)#no login r5(config-line)#line con 0 r5(config-line)#no exec-timeout r5(config-if)#int lo0 r5(config-if)#des router-id r5(config-if)#ip add 5.5.5.5 255.255.255.255 r5(config-if)#int f 0/0 r5(config-if)#des link to r3 r5(config-if)#ip add 192.168.4.2 255.255.255.0 r5(config-if)#no shut r5(config-if)#router ospf 1 r5(config-router)#router-id 5.5.5.5 r5(config-router)#net 192.168.4.0 0.0.0.255 area 2 r5(config-router)#end r5# r6 配置
router>en
router#conf t router(config)#host r6 r6(config)#ena sec 123 r6(config)#no ip domain-lookup r6(config)#ban mot #Welcome to r6# r6(config)#line vty 0 4 r6(config-line)#no login r6(config-line)#line con 0 r6(config-line)#no exec-timeout r6(config-if)#int lo0 r6(config-if)#des router-id r6(config-if)#ip add 6.6.6.6 255.255.255.255 r6(config-if)#int f 0/0 r6(config-if)#des link to r4 r6(config-if)#ip add 192.168.5.2 255.255.255.0 r6(config-if)#no shut r6(config-if)#router ospf 1 r6(config-router)#router-id 6.6.6.6 r6(config-router)#net 192.168.5.0 0.0.0.255 area 3 r6(config-router)#end r6# 断开 Area 0 时的 r1 跟 r2 路由表，只有自己这边的路由信息
r1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0 O IA 192.168.4.0/24 [110/2] via 192.168.2.2, 00:03:55, FastEthernet1/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet1/0 r2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0 192.168.5.0/32 is subnetted, 1 subnets O IA 192.168.5.1 [110/2] via 192.168.3.2, 00:01:03, FastEthernet1/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.3.0/24 is directly connected, FastEthernet1/0 r1 与 r2 之间建立虚链路，将area0连接起来。
新的配置
r1 配置
router>en
router#conf t router(config)#host r1 r1(config)#ena sec 123 r1(config)#no ip domain-lookup r1(config)#ban mot #Welcome to r1# r1(config)#line vty 0 4 r1(config-line)#no login r1(config-line)#line con 0 r1(config-line)#no exec-timeout r1(config-if)#int lo0 r1(config-if)#ip add 1.1.1.1 255.255.255.255 r1(config-if)#int f 0/0 r1(config-if)#des link to r2 r1(config-if)#ip add 192.168.1.1 255.255.255.0 r1(config-if)#no shut r1(config-if)#int f 1/0 r1(config-if)#des link to r3 r1(config-if)#ip add 192.168.2.1 255.255.255.0 r1(config-if)#no shut r1(config-if)#router ospf 1 r1(config-router)#router-id 1.1.1.1 r1(config-router)#net 192.168.1.0 0.0.0.255 area 1 r1(config-router)#net 192.168.2.0 0.0.0.255 area 0 r1(config-router)#area 1 virtual-link 2.2.2.2
r1(config-router)#end r1# r2 配置
router>en
router#conf t router(config)#host r2 r2(config)#ena sec 123 r2(config)#no ip domain-lookup r2(config)#ban mot #Welcome to r2# r2(config)#line vty 0 4 r2(config-line)#no login r2(config-line)#line con 0 r2(config-line)#no exec-timeout r2(config-if)#int lo0 r2(config-if)#des router-id r2(config-if)#ip add 2.2.2.2 255.255.255.255 r2(config-if)#int f 0/0 r2(config-if)#des link to r1 r2(config-if)#ip add 192.168.1.2 255.255.255.0 r2(config-if)#no shut r2(config-if)#int f 1/0 r2(config-if)#des link to r4 r2(config-if)#ip add 192.168.3.1 255.255.255.0 r2(config-if)#no shut r2(config-if)#router ospf 1 r2(config-router)#router-id 2.2.2.2 r2(config-router)#net 192.168.1.0 0.0.0.255 area 1 r2(config-router)#net 192.168.3.0 0.0.0.255 area 0 r2(config-router)#area 1 virtual-link 1.1.1.1
r2(config-router)#end r2# area 0 合并后的路由表
r1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0 O IA 192.168.4.0/24 [110/2] via 192.168.2.2, 00:00:00, FastEthernet1/0 192.168.5.0/32 is subnetted, 1 subnets O IA 192.168.5.1 [110/3] via 192.168.1.2, 00:00:00, FastEthernet0/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet1/0 O 192.168.3.0/24 [110/2] via 192.168.1.2, 00:00:00, FastEthernet0/0 r2#show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set
2.0.0.0/32 is subnetted, 1 subnets C 2.2.2.2 is directly connected, Loopback0 O IA 192.168.4.0/24 [110/3] via 192.168.1.1, 00:00:24, FastEthernet0/0 192.168.5.0/32 is subnetted, 1 subnets O IA 192.168.5.1 [110/2] via 192.168.3.2, 00:00:24, FastEthernet1/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 O 192.168.2.0/24 [110/2] via 192.168.1.1, 00:00:24, FastEthernet0/0 C 192.168.3.0/24 is directly connected, FastEthernet1/0 本文出自 “人类一思考，上帝都发笑” 博客，转载请与作者联系！ 本文出自 51CTO.COM技术博客 |
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