I've been using the following config for ADSL backup to a serial line, however it seems to show strange behaviour.
no ip address
no ip mroute-cache
no atm ilmi-keepalive
dsl operating-mode auto
hold-queue 224 in
encapsulation aal5mux ppp dialer
dialer pool-member 1
description Customer LAN
ip address 126.96.36.199 255.255.255.248
description Link to ISP
backup interface Dialer1
ip address 188.8.131.52 255.255.255.252
ip address negotiated
dialer pool 1
ppp chap hostname [email protected]
ppp chap password 0 1234
ppp pap sent-username [email protected] password 0 1234
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 Dialer1 254
When the router boots up with both lines connected, the Dialer1 is set to standby state, whilst the serial is working. If the serial line drops, logging shows the Dialer1 go up, but no further authentication/PPP events are logged and the device doesn't log in.
IF the router is booted up with the serial line disconnected, the ATM interface and dialer interface are brought up and the DSL works, and when the serial line is then brought up/dropped the ATM/Dialer will work each time.
Can anyone advise why this would be the case, or what better way to do the configuration.
We have swapped to using:
backup interface ATM0
So that the whole adsl is disabled until required, however this stops us from checking on ADSL sync/monitoring.
Thanks in advance!