I have a 3640 router (Pri rate Interface / backup ISDN interfaces) that is
not performing as I thought it would...One of the channelised interfaces
went down yesterday and the backup ISDN for that line kicked in, however I
could no longer ping into the remote site once the backup came up - The
remote router is a 1720.
I could ping from router to router (In both directions).
I could not ping from a client in Site A to router in Site B, or beyond.
I could not ping from a client in Site B to router in Site A, or beyond.

Below is part of the config:

SITE A - 3640

interface FastEthernet0/0
 ip address 192.168.25.25 255.255.255.0

 duplex auto

 speed 100

 no cdp enable


interface Serial0/0:1

 bandwidth 128

 backup delay 20 20

 backup interface BRI1/1

 ip unnumbered FastEthernet0/0

 no ip directed-broadcast

 encapsulation ppp

 fair-queue 64 256 0

 no cdp enable



interface BRI1/1

 ip unnumbered FastEthernet0/0

 no ip directed-broadcast

 encapsulation ppp

 dialer idle-timeout 300

 dialer string XXXXXXXX

 dialer hold-queue 20

 dialer-group 1

 isdn switch-type basic-net3

 no cdp enable

 ppp authentication chap



ip route 192.1.1.0 255.255.255.0 Serial0/0:1

ip route 192.1.1.0 255.255.255.0 BRI1/1 50



access-list 100 permit ip any any

access-list 100 permit icmp any any

dialer-list 1 protocol ip list 100



SITE B - 1720



interface BRI0
 ip unnumbered FastEthernet0
 encapsulation ppp
 dialer idle-timeout 300
 dialer string XXXXXXX

 dialer hold-queue 50
 dialer-group 1
 isdn switch-type basic-net3
 ppp authentication chap
!
interface FastEthernet0
 ip address 192.1.1.25 255.255.255.0
 speed auto
!
interface Serial0
 bandwidth 128
 backup delay 20 20
 backup interface BRI0
 ip unnumbered FastEthernet0
!
ip classless
ip route 192.168.25.0 255.255.255.0 Serial0
ip route 192.168.25.0 255.255.255.0 BRI0 50
no ip http server
!
access-list 100 permit ip any any
access-list 100 permit icmp any any
dialer-list 1 protocol ip list 100



Can anyone out there see anything obviously wrong with the above config....



Thanks in advance.



Derek




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