After setting the route tables in each router, you need to configure the router to determine what
brings up the ISDN line. An administrator uses the dialer-list global configuration command
to define what is interesting traffic.
The command to configure all IP traffic as interesting is as follows:
804A(config)#dialer-list 1 protocol ip permit
804A(config)#interface bri0
804A(config-if)#dialer-group 1
The dialer-group command associates a dialer list to the BRI interface. Extended access
lists can be used with the dialer-list command to define exactly which traffic is interesting.
We’ll cover that in a minute.