with the below config, dialer 3 triggers once the below command is invoked
no backup interface dialer 3
-----------------------------------
interface Serial1/0/1
description Link to aaaaaaaaa
bandwidth 128
backup interface Dialer3
ip address 10.1.1.1 255.255.255.252
no ip unreachables
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
ip tcp header-compression
no ip mroute-cache
shutdown
fair-queue 64 512 3
clock rate 2000000
no cdp enable
end
interface Dialer3
description ISDN Backup NO: site 1
bandwidth 128
ip address 10.1.1.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
shutdown
dialer pool 3
dialer remote-name remoterouter
dialer idle-timeout 300
dialer string 111122222
dialer hold-queue 100
dialer-group 3
fair-queue 64 512 3
no cdp enable
ppp authentication chap
ppp chap hostname BahrainISDN
ppp chap password ourpassword
ppp multilink
ppp multilink links minimum 2
-------------------------------------------------------
sh ip int brief
Dialer1 10.127.254.250 YES TFTP up up
Dialer2 10.127.254.254 YES NVRAM up up
Dialer3 10.127.254.246 YES NVRAM standby mode/disabled down
Dialer5 10.127.254.234 YES NVRAM up up
