Hi all, can anyone tell me how the traffic will flow if I have 2 sites, they have 2 routers each, 1 primary and 1 backup, the active hsrp router routes via the e1. the backup uses the isdn, i would like to know how the routing protocol, eigrp would use the isdn on the other router if the e1 went down, would the pri router learn routes from the backup router to go via that link id the primary is down ?