Hello, I have two 2503 routers connecting together via ISDN through a Teltone ILS-2000. I *believe* that the ILS is configured correctly, as well as my SPIDs and DNs on my routers. I set the "backup interface BRI0" on the calling router, and it's verified in standby mode (sh ip int brie). I tear down the s0 interface (frame relay) and the call comes up, no problem. OSPF reconverges, and I receive the routes through the ISDN connection. Now, the weird thing (if it's considered that), is that the called router CANNOT have the backup interface command. Because if it does, the call NEVER comes up. Once I take out that statement, however, the call comes up immediately. Now, I guess my question/issue is: can't the called router be in "backup interface" mode as well as the calling router? I seem to have run across many lab situations where both sides needed to be able to initiate the call, but I can't seem to get it to work that way (case in point: Solie's CCIE Practical Labs I). I've been busting my brain trying to figure this out. I *may* have my Teltone configured wrong, but I don't think so. It could also be my ISDN spids, etc, but if the call comes up and the link establishes up to layer 3, doesn't that prove that all those configurations are correct? And that there is some issue about the backup interface commands? I can't seem to find anything on CCO regarding having both routers configured for DDR or not...Someone, please shed some light on this situation. thanks, Eddie
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