I currently have 2 876 routers with ISDN as a backup.
When i passed CCNA back in 2003 i read that for chap authentication one needs to configure chap username and password of the peer router and then define dialer string in dialer interface.
However these routers have a different setup and at the dialer interface they use the command 'ppp authentication chap pap callin'. I read that this is a new way of defining a commom username/password of the router with the difference that you basically define your router's credentials and not your peers. For example for router 1 you define his own credentials and not his peer's (router2).
Now the problem is that these routers have been setup with SDM and a 'dialer string' has been configured. I am asked to reconfigure them because of a 3rd router existance so i need to define 'dialer map' commands.
So, if anyone knows please reply on the following:
1. Is 'dialer map' command compatible with 'ppp authentication chap pap callin' setup?
2. Has 'dialer map' command been substituted with another command?
3. Do i need to configure anything else except from the dialer?
FYI i also submit the sh startup config for ISDN
ip address 192.168.3.1 255.255.255.0
dialer pool 1
dialer string xxxxx
dialer load-threshold 128 outbound
no cdp enable
ppp authentication chap callin
ppp chap hostname rout1
ppp chap password xxxxxxxx
Many thanks in advance