if u enter this command under any primary interface u need to specify which interface is going to work as a backup for the primary interface.
the back interface should have a route to the remote connection what ever u r using.
common scenario u can take is bri interface serving as backup to serial interface.
backup interface bri0
that alone is enuf.
the command waits till the interface goes down, 1ce the serial 0/0 goes down, it will wake-up the BRI0 interface.till that time BRI0 is not initiated
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will i need to put any routes in there with a cost in ? ie static route through s0 and static route with a cost in for the bri0 ?
i dont think u need more configuration for that...
here u just need to configure bri...and need to publish that ip address in to your routing protocol...
u can have clear picture by this link
just readit it will clear you whole fundamental...
rate this post if it helps