子下向上拨号连入拨号备份：
Config t
hostname xxxx
enable secret oilsjz
username xxxx password xxxxx
username xxxx password 0 xxxx
no ip domain-lookup
chat-script reset1 "" "ATZ" OK \c
chat-script dial1 ABORT ERROR "" "AT Z" OK "ATDT \T" TIMEOUT 60 CONNECT \c
interface fastEthernet0
ip address 10.179.27.65 255.255.255.192
no shutdown
interface Serial1
backup delay 10 10
backup interface Serial0
ip address 10.179.251.41 255.255.255.252
encapsulation frame-relay
frame-relay interface-dlci 200
no shutdown
interface serial0
phy async
ip address 10.179.251.139 255.255.255.240
async mode dedicated
no shutdown
encapsulation ppp
dialer in-band
dialer idle-timeout 3600
dialer enable-timeout 60
dialer map ip 10.179.251.129 name center-3640 modem-script dial1 ZZZZZZ
dialer map ip 10.179.251.129 name center-3640 modem-script dial1 ZZZZZZ
dialer map ip 10.179.251.129 name center-3640 modem-script dial1 ZZZZZZ
dialer map ip 10.179.251.129 name R-ZZZZ modem-script dial1 ZZZZZZ
dialer hold-queue 50
dialer-group 1
ppp authentication pap chap
ip route 0.0.0.0 0.0.0.0 10.179.251.129
access-list 1 per 10.179.27.64 0.0.0.63
dialer-list 1 protocol ip list 1
router eigrp 100
network 10.0.0.0
line con 0
exec-timeout 0 0
line 1
script reset reset1
modem InOut
transport input all
speed 38400
flowcontrol hardware
line vty 0 4
password oilsjz
login
end