[c-nsp] PPP multilink over DSL Problem

[Zahid Hassan]

Dear All, 

We are testing PPP multilink over 2 DSL lines. 
After running for a while, we see packet drops. 
This usually happens after one or two hours of operations. 
The packets drops are constant and occurs at a fixed interval of 4. 

Here is an extract of our config: 

We are running 12.2(15)T13 on Cisco 1760. 


! 
interface ATM0/0 
no ip address 
no atm ilmi-keepalive 
pvc 0/38 
encapsulation aal5mux ppp dialer 
dialer pool-member 1 
! 
dsl operating-mode auto 
! 
interface ATM1/0 
no ip address 
no atm ilmi-keepalive 
pvc 0/38 
encapsulation aal5mux ppp dialer 
dialer pool-member 1 
! 
dsl operating-mode auto 
! 
interface Dialer0 
ip address negotiated 
encapsulation ppp 
dialer pool 1 
no cdp enable 
ppp chap hostname xxxx 
ppp chap password yyyy 
ppp multilink 
! 


Can anyone shed any light or comment on this config. 
Could this be a physical layer issue rather then the config ? 

Any help or advise will be greatly appreciated. 

Regards, 

Zahid