高可用性网络--路由器链路备份篇
前面我们降到过交换机之间的链路备份，本章我们来讲路由器之间的链路备份
静态浮动路由应用场合
骨干链路是动态路由 备份链路为低速的拨号链路静态路由
[R1]dis cu
Now create configuration...
Current configuration
!
version 1.74
sysname R1
firewall enable
aaa-enable
aaa accounting-scheme optional
!
interface Aux0
async mode flow
link-protocol ppp
!
interface Ethernet0
ip address 192.168.1.1 255.255.255.0
ospf enable area 0.0.0.0
!
interface Ethernet1
!
interface Serial0
link-protocol ppp
ip address 192.168.3.1 255.255.255.0
ospf enable area 0.0.0.0 //S0接口 启用OSPF
!
interface Serial1
link-protocol ppp
ip address 192.168.4.1 255.255.255.0
!
voice-setup
!
subscriber-line 0
!
subscriber-line 1
!
quit
!
quit
ospf enable
!
Quit
ip route-static 192.168.2.0 255.255.255.0 192.168.4.2 preference 60 //备份链路为静态
!
Return
[R2]dis cu
Now create configuration...
Current configuration
!
version 1.74
sysname R2
firewall enable
aaa-enable
aaa accounting-scheme optional
!
interface Aux0
async mode flow
link-protocol ppp
!
interface Ethernet0
ip address 192.168.2.1 255.255.255.0
ospf enable area 0.0.0.0
!
interface Ethernet1
!
interface Serial0
link-protocol ppp
ip address 192.168.3.2 255.255.255.0
ospf enable area 0.0.0.0
!
interface Serial1
link-protocol ppp
ip address 192.168.4.2 255.255.255.0
!
voice-setup
!
subscriber-line 0
!
subscriber-line 1
!
quit
!
quit
ospf enable
!
Quit
ip route-static 192.168.1.0 255.255.255.0 192.168.4.1 preference 60
!
Return
此时我们在PC1上ping 192.168.2.1 是可以正常通信的
现在我们看下R1的路由表 走的是OSFP 骨干链路
现在我们模拟R1的S0接口失效，看看会不会走静态路由
下面我们在PC1上ping 192.168.2.1
此时我们再看下R1的路由表
我们可以看到 此时的到达192.168.2.0网段的 走的是静态路由 从S1接口转发
还有这样一种情况 路由器之间的链路都是比较好的骨干链路 动态路由，这样我们怎么实现备份呢
我们实现路由器路由协议是OSFP，主链路是S0接口的链路，备份链路是S1接口的链路
当主链路断掉的时候走自动切换到备份链路，当链路恢复后继续使用主链路
[R1]dis cu
Now create configuration...
Current configuration
!
version 1.74
sysname R1
firewall enable
aaa-enable
aaa accounting-scheme optional
!
interface Aux0
async mode flow
link-protocol ppp
!
interface Ethernet0
ip address 192.168.1.1 255.255.255.0
ospf enable area 0.0.0.0
!
interface Ethernet1
!
interface Serial0
link-protocol ppp
standby interface Serial 1 //在主接口设置备份的接口S1
ip address 192.168.3.1 255.255.255.0
ospf enable area 0.0.0.0
!
interface Serial1
link-protocol ppp
ip address 192.168.4.1 255.255.255.0
ospf enable area 0.0.0.0
!
voice-setup
!
subscriber-line 0
!
subscriber-line 1
!
quit
!
quit
ospf enable
!
Quit
!
Return
[R2]dis cu
Now create configuration...
Current configuration
!
version 1.74
sysname R2
firewall enable
aaa-enable
aaa accounting-scheme optional
!
interface Aux0
async mode flow
link-protocol ppp
!
interface Ethernet0
ip address 192.168.2.1 255.255.255.0
ospf enable area 0.0.0.0
!
interface Ethernet1
!
interface Serial0
link-protocol ppp
standby interface Serial 1 //在主接口设置备份的接口S1
ip address 192.168.3.2 255.255.255.0
ospf enable area 0.0.0.0
!
interface Serial1
link-protocol ppp
ip address 192.168.4.2 255.255.255.0
!
voice-setup
!
subscriber-line 0
!
subscriber-line 1
!
quit
!
quit
ospf enable
!
Quit
!
Return
正常走S0接口
现在我们模拟S0接口断开，观察下R1理由表
此时走的是的备份链路
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