ISDN as backup for Frame Relay ( Help !!!)

[Cindy007]

I'm configuring ISDN as a backup for frame relay using dialer profile for 2 site (Singapore and China).But only one site can be backup which means if the serial on the singapore site is down it will backup but not for the serial on the china site .I was wondering whether is there a 2 site backup or only one site ? Can anyone please help me ... ? Here is the configuration n figure for the 2 site of the router .


China---S1----Frame Relay----S0---Singapore
\----Bri0--------ISDN--------Bri0----/


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Configuration for China

!
hostname China
username Singapore password 0 cisco
no ip domain-lookup
isdn switch-type basic-ni
!
interface FastEthernet0/0
ip address 172.16.48.1 255.255.240.0
no shutdown
!
interface BRI0/0
no ip address
no ip directed-broadcast
encapsulation ppp
dialer pool-member 3
isdn switch-type basic-ni
isdn spid1 51055540000001 5554000
isdn spid2 51055540010001 5554001
ppp authentication chap
no shutdown
!
interface Serial0/1
backup delay 5 10
backup interface Dialer2
ip address 172.16.96.2 255.255.240.0
no shutdown
encapsulation frame-relay
frame-relay map ip 172.16.96.1 17
!
interface Dialer2
ip address 172.16.16.2 255.255.240.0
encapsulation ppp
dialer remote-name Singapore
dialer idle-timeout 60
dialer string 5551234
dialer string 5551235
dialer load-threshold 128 either
dialer pool 1
dialer-group 3
ppp authentication chap
ppp multilink
!
router igrp 100
passive-interface Dialer2
network 172.16.0.0
!
ip classless
ip route 172.16.32.0 255.255.240.0 172.16.96.1
ip route 172.16.32.0 255.255.240.0 172.16.16.1 200
!
dialer-list 1 protocol ip permit
!
end

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Configuration on Singapore :

hostname Singapore
username China password 0 cisco
no ip domain-lookup
isdn switch-type basic-ni
!
interface FastEthernet0/0
ip address 172.16.32.1 255.255.240.0
no shutdown
!
interface Serial0/0
backup delay 10 15
backup interface Dialer1
ip address 172.16.96.1 255.255.240.0
no ip directed-broadcast
encapsulation frame-relay
no shutdown
frame-relay map ip 172.16.96.1 17
exit
!
interface BRI0/0
encapsulation ppp
dialer pool-member 5
isdn switch-type basic-ni
isdn spid1 51055512340001 5551234
isdn spid2 51055512350001 5551235
ppp authentication chap
no shutdown
!
interface Dialer1
ip address 172.16.16.1 255.255.240.0
encapsulation ppp
dialer remote-name China
dialer idle-timeout 60
dialer string 5554000
dialer string 5554001
dialer load-threshold 128 either
dialer pool 5
dialer-group 1
ppp authentication chap
ppp multilink
!
router igrp 100
passive-interface Dialer1
network 172.16.0.0
!
ip route 0.0.0.0 0.0.0.0 172.16.96.2
ip route 0.0.0.0 0.0.0.0 172.16.16.2 200
!
dialer-list 1 protocol ip permit
!
end

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

[Sigocpt]

You could avoid using the backup interface commands and use OSPF.

You would make the cost of the ISDN line very high so that it would only come active if the serial line went down. And this would work both ways since the ISDN interface would always be on but not passing traffic.