shutdown !
interface Serial2
physical-layer async
ip address 16.249.123.18 255.255.255.252 encapsulation ppp async mode dedicated dialer in-band
dialer idle-timeout 60
dialer map ip 16.249.123.17 name c4700 6825179 dialer-group 1
ppp authentication chap !
interface Serial3 no ip address shutdown no cdp enable !
interface Serial4 no ip address shutdown no cdp enable !
interface Serial5 no ip address
no ip mroute-cache shutdown !
interface Serial6 no ip address
no ip mroute-cache shutdown !
interface Serial7 no ip address
no ip mroute-cache shutdown !
interface Serial8 no ip address
no ip mroute-cache shutdown !
interface Serial9 no ip address
no ip mroute-cache
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shutdown !
interface BRI0 no ip address
no ip mroute-cache shutdown !
router eigrp 200 network 16.0.0.0 !
ip classless !
dialer-list 1 protocol ip permit !
line con 0 line 2
script dialer cisco-default script reset reset modem InOut
modem autoconfigure discovery rxspeed 38400 txspeed 38400
flowcontrol hardware line aux 0 line vty 0 4
password cisco login ! end
c2522rb#
4. 异步拨号备份X.25:
设置X.25的拨号备份,首先X.25连接的端口必须运行动态路由协议,异步拨号口必须使用静态路由.本例选择EIGRP作为路由选择协议,将静态路由的Metric的值设置为200,由于EIGRP的默认Metric为90,所以当同时有两条路径通往同一网段时,其中Metric值小的路径生效,而当X.25连接出现问题时,路由
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器无法通过路由协议学习到路由表，则此时静态路由生效，访问通过拨号端口实现。当X.25连接恢复正常时，路由器又可以学习到路由表，则由于 Metric值的不同，静态路由自动被动态路由所代替，这样就实现了备份的功能。
路由器Router1配置如下:
hostname router1 !
enable secret 5 $1$UTvD$99YiY2XsRMxHudcYeHn.Y. enable password cisco !
username router2 password cisco ip subnet-zero
chat-script cisco-default \chat-script reset atz
interface Ethernet0
ip address 202.96.38.100 255.255.255.0 !
interface Serial0
ip address 202.96.0.1 255.255.255.0 encapsulation x25 x25 address 10112227 x25 htc 16
x25 map ip 202.96.0.2 10112225 broadcast !
interface Serial1 no ip address shutdown ! !
interface Async 1
ip address 202.96.1.1 255.255.255.252 encapsulation ppp dialer in-band
dialer idle-timeout 60
dialer map ip 202.96.1.2 name router2 modem-script cisco-default 2113470 dialer-group 1
ppp authentication chap !
router eigrp 200
redistribute connected network 202.96.0.0 !
ip route 202.96.37.0 255.255.255.0 202.96.1.2 200 dialer-list 1 protocol ip permit
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line con 0 line aux 0
script dialer cisco-default script reset reset modem InOut
modem autoconfigure discovery transport input all rxspeed 38400 txspeed 38400
flowcontrol hardware line vty 0 4
password cisco login ! end
路由器Router2配置如下: hostname router2 !
enable secret 5 $1$T4IU$2cIqak8f/E4Ug6dLT0k.J0 enable password cisco !
username router1 password cisco ip subnet-zero
chat-script cisco-default \chat-script reset atz !
interface Ethernet0
ip address 202.96.37.100 255.255.255.0 !
interface Serial0
ip address 202.96.0.2 255.255.255.0 no ip mroute-cache encapsulation x25 x25 address 10112225 x25 htc 16
x25 map ip 202.96.0.1 10112227 broadcast !
interface Serial1 no ip address shutdown !
interface Async1
ip address 202.96.1.2 255.255.255.252 encapsulation ppp keepalive 30
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async default routing async mode dedicated dialer in-band
dialer idle-timeout 60
dialer wait-for-carrier-time 120
dialer map ip 202.96.1.1 name router1 modem-script cisco-default 2113469 dialer-group 1
ppp authentication chap !
router eigrp 200 redistribute static network 202.96.0.0 !
no ip classless
ip route 202.96.38.0 255.255.255.0 202.96.1.1 200 dialer-list 1 protocol ip permit !
line con 0
exec-timeout 0 0 line aux 0
script reset reset modem InOut
modem autoconfigure discovery transport input all rxspeed 38400 txspeed 38400
flowcontrol hardware line vty 0 4
password cisco login ! end
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