I tried configuring an isdn wan connection recently and after inputting all the necessary data such as the isdn switch type, dialer list, the ip adds. of both bri0 interfaces and then manually mapping the ip adds to the corresponding telephone nos., the bri0 int would come up on both layers 2 and 3 however, when i check the interfaces i would discover two subinterfaces under bri0 which is bri0:1 and bri0:2 and both are down. Do i have to do any configuration on these bri0 subinterfaces. I've been checking my books and other info on the web and there's nothing there indicating such.
I would appreciate any info regarding this. Thanks.