请教如何配置路由器拨号备份，，，

flyfox518

eden

.......modern conf

building configuration....
current configuration:
!
version 12.0
service timestamps log uptime
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname rX
!
enable password cisco
!
username rx password 0 cisco
isdn swithc-type basic-net3
!
interface s0
no ip address
encapsulation frame-relay
no fair-queue
!
interface serial0.202 point-to-point
backup delay 60 10
backup interface dialer1
ip address XXXX XXXX
frame-relay interface-dlci xxx
!
interface bri0
no ip address
encapsulation ppp
isdn spid1 xxxxxxxxxxx
isdn spid2 xxxxxxxxxx
dialer pool-member 1
!
interface dialer1
ip address xxxx xxxx
encapsulation ppp
dialer remote-name xxx
dialer string xxxx
dialer pool 1
dialer-group 1
ppp authentication chap xxxx
!
ip classless
ip route xxxx xxxx xxxx
ip route xxxx xxxx xxxx 210//配置静态路由
!
dialer-list 1 protocol ip permit
end

eden

上面是ISDN BRI配置，跟书上的差不多