Here is a sample config for the central (PRI router) set up with dialer profiles:
controller E1 1/0
framing esf
linecode b8zs
pri-group timeslots 1-24
interface Serial1/0:23
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type primary-5ess
no peer default ip address
no fair-queue
ppp authentication chap
!
interface Dialer1
description backup link for U.K.
ip address 172.20.1.1 255.255.255.0
encapsulation ppp
dialer pool 1
dialer remote-name isdn_red_rtr
dialer idle-timeout 300
dialer load-threshold 2 either
dialer-group 1
no peer default ip address
no fair-queue
ppp authentication chap
ppp multilink
!
interface Dialer2
description backup link for mass
ip address 172.20.2.1 255.255.255.0
encapsulation ppp
dialer pool 1
dialer remote-name mass_red_rtr
dialer-group 1
ppp authentication chap
ppp multilink
!
interface Dialer3
description backup link for texas
ip address 10.99.1.49 255.255.255.252
encapsulation ppp
dialer pool 1
dialer remote-name texas_red_rtr
dialer-group 1
ppp authentication chap
ppp multilink
!
interface Dialer4
description ISDN backup link for ohio
ip address 10.99.1.54 255.255.255.252
encapsulation ppp
dialer pool 1
dialer remote-name ohio_red_rtr
dialer-group 1
ppp authentication chap
ppp multilink
dialer-list 1 protocol ip permit
Use dialer string command in dialer interface if you want your PRI router to dial out to remotes.
