双链路基于时间自动切换

kenny.lei

我们让R2的S1/0 工作在白天， 每天 到12点的时候，E0/0自动接替S1/0的工作，我的实验得到了验证，配置如下：
R1，仿真PC就不说了，敲个地址，指个网关就OK
R3，起loopback 0 ：3.3.3.3/24.我们的目的网络.

      R2的配置：
interface Ethernet0/0
ip address 203.1.1.2 255.255.255.0
ip nat outside
!
interface Serial1/0
ip address 23.1.1.2 255.255.255.0
ip nat outside
clock rate 64000
!
interface Serial2/0
ip address 12.1.1.2 255.255.255.0
ip nat inside
ip policy route-map test
!
ip nat pool reeper1 23.1.1.2 23.1.1.2 netmask 255.255.255.0
ip nat pool reeper2 203.1.1.2 203.1.1.2 netmask 255.255.255.0
ip nat inside source list 101 pool reeper1 overload
ip nat inside source list 102 pool reeper2 overload
ip classless
ip route 0.0.0.0 0.0.0.0 23.1.1.3
ip route 0.0.0.0 0.0.0.0 203.1.1.3
!
!
access-list 101 permit ip any any time-range day
access-list 102 permit ip any any time-range night
!
route-map test permit 10
match ip address 101
set ip next-hop 23.1.1.3
!
route-map test permit 20
match ip address 102
set ip next-hop 203.1.1.3
!

time-range day
periodic daily 8:00 to 23:59
!
time-range night
periodic daily 0:00 to 8:00
!
End

测试：我们在R1上ping 3.3.3.3  ,查看R2 上输出的debug ip nat信息：

R2#debug ip nat
IP NAT debugging is on
R2#sh cloc
09:16:04.007 CST Thu Nov 16 2006
R2#
Nov 16 01:16:11.515: NAT: s=12.1.1.1->23.1.1.2, d=3.3.3.3 [75]
Nov 16 01:16:11.535: NAT*: s=3.3.3.3, d=23.1.1.2->12.1.1.1 [75]
Nov 16 01:16:11.555: NAT: s=12.1.1.1->23.1.1.2, d=3.3.3.3 [76]
Nov 16 01:16:11.575: NAT*: s=3.3.3.3, d=23.1.1.2->12.1.1.1 [76]

可见R2把R1发过来的包转换到了 串口网段。

那么我们改一下时间，继续测试：
R2#sh cloc
09:19:31.967 CST Thu Nov 16 2006
R2#cloc set 7:50:00 16 Nov 2006

R2#sh cloc
07:51:20.291 CST Thu Nov 16 2006
R2#
Nov 15 23:51:24.847: NAT: s=12.1.1.1->203.1.1.2, d=3.3.3.3 [90]
Nov 15 23:51:24.855: NAT*: s=3.3.3.3, d=203.1.1.2->12.1.1.1 [90]
Nov 15 23:51:24.879: NAT: s=12.1.1.1->203.1.1.2, d=3.3.3.3 [91]
Nov 15 23:51:24.879: NAT*: s=3.3.3.3, d=203.1.1.2->12.1.1.1 [91]

发现已经转换到了 以太口。

我们等几分钟，看到8：00的时候是否自动切换线路：

07:59:53.379 CST Thu Nov 16 2006
R2#
Nov 15 23:59:54.867: NAT: s=12.1.1.1->203.1.1.2, d=3.3.3.3 [95]
Nov 15 23:59:54.867: NAT*: s=3.3.3.3, d=203.1.1.2->12.1.1.1 [95]
Nov 15 23:59:54.887: NAT: s=12.1.1.1->203.1.1.2, d=3.3.3.3 [96]
Nov 15 23:59:54.887: NAT*: s=3.3.3.3, d=203.1.1.2->12.1.1.1 [96]

R2#sh cloc
08:00:18.879 CST Thu Nov 16 2006
R2#
Nov 16 00:00:19.959: NAT: expiring 203.1.1.2 (12.1.1.1) icmp 19 (19)
R2#
Nov 16 00:00:20.579: NAT: s=12.1.1.1->23.1.1.2, d=3.3.3.3 [135]
Nov 16 00:00:20.599: NAT*: s=3.3.3.3, d=23.1.1.2->12.1.1.1 [135]
Nov 16 00:00:20.619: NAT: s=12.1.1.1->23.1.1.2, d=3.3.3.3 [136]
Nov 16 00:00:20.639: NAT*: s=3.3.3.3, d=23.1.1.2->12.1.1.1 [136]


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