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I found a url who explains this method.It's called Floating Static Routeshttp://www.netcraftsmen.net/resources/archived-articles/524-designing-default-and-dial-backup.html
HiI'm only a CCNA student, so I can make a mistake..But I try to give you my solution.You probably configured the boundary router of Data Center 1 as the gateway of last resources whit the link to ISP as exit interface.The OSPF has an Administrative ...
