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EIGRP hello and update bringing the ISDN link up
Any interesting IP traffic, if not explicitly denied on a dialer list, brings up the dialer interface. Enhanced Interior Gateway Routing Protocol (EIGRP) hellos and updates act as interesting traffic and initiate an ISDN connection on a BRI if not explicitly denied in the interesting traffic list.
Configure the ISDN as a backup link and configure the BRI or PRI interface(s) as passive interfaces under the respective routing protocol configuration, in this case EIGRP. Then configure a floating static route pointing to the BRI or PRI interface.