Hey everyone, I'm trying to configure lab #16 of the CCIE Practical Studies Vol. 1 book (Cisco Press). I noticed that both of the routers configured for ISDN backup are also configured as backup interfaces. Now, I can't recall exactly where it is at the moment, but I could have sworn that I read in earlier chapters that "one should only configure a backup interface at the remote site router." If this is true, then why would the configuration call for both routers to be configured for DDR? What's more is when I tried to configure both routers, the call would never establish, as the called router would keep its ISDN interface inactive. Only when I disabled the "backup" commands on the called router, was the call able to be set up by the calling router. Am I doing something wrong, or is this another one of Cisco's famous "typos"? I do admit that I've only just learned to configure my Teltone switch to work with the routers, so I'm not sure I have it all correct. Anyone have any insight? Thanks in advance! Eddie
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