pca----routera----68001001----ISDN----68001002----routerb----pcb

10.0     fa0/0       bri0/0                                      bri0/0       fa0/0 11.0

// router a

username routerb pass cisco

isdn switch-type basic-net3

int dialer1

  description connected to routerb

  ip unnumbered fa0/0

  no ip split-horizon

  encap ppp

  ppp authe chap

  dialer in-band

  dialer idle-timeout 120

  dialer hold-queue 10

  dialer map snapshot 1 name routerb broadcast

  dialer map ip 192.168.11.254 name routerb speed 64 broadcast 68001002

  dialer-group 1

  no ppp multilink

  snapshot server 5 dialer

  no cdp enable

int fa0/0

  description connected to LAN_A

  ip addr 192.168.10.254 255.255.255.0

int bri0/0

  description connected to routerb

  no ip addr

  dialer rotary-group 1

dialer-list 1 protocol ip permit

router rip

  version 2

  netw 192.168.10.0

  no auto

//router b

username routera pass cisco

isdn switch-type basic-net3

int dialer1

  description connected to routera

  ip unnumbered fa0/0

  no ip split-horizon

  encap ppp

  ppp authe chap

  dialer in-band

  dialer map snapshot 1 name routera broadcast 68001001

  dialer map ip 192.168.10.254 name routera speed 64 broadcast 68001001

  dialer-group 1

  no ppp multilink

  snapshot client 15 360 suppress-statechange-update dialer

  no cdp enable

int fa0/0

  description connected to LAN_B

  ip addr 192.168.11.254 255.255.255.0

int bri0/0

  description connected to routera

  no ip addr

  dialer rotary-group 1

dialer-list 1 protocol ip permit

router rip

  version 2

  netw 192.168.11.0

  no auto-summary