Yes this is possible exactly as you discribed.  Hope fully in this 
scenario you have more than one bri.  But, say you don't
you have two B channels unless the load exceeds one of the B channels 
you have no problem.... I believe the last question
is "is there a priority or preempt command?"  Make a dialer interface 
and see : - )

John Neiberger wrote:

>I was just talking to a guy I work with about this and I thought it was
>an interesting scenario.  It was his idea and my first thought was that
>it wasn't possible, but then after a little more pondering I decided
>that it might be possible.  Note:  'possible' does not mean desirable. 
>:-)    Here's the scoop:
>
>
>
>[A]-----------------[B]
>  |  \        
>  |    \
>  |      \
>  |        \
>  |          \
>  |            \
>  |              \
>[C] ----------- [D]
>
>Site A is connected to B, a disaster recovery facility, via frame
>relay.  A also has point-to-point connections to sites C and D.   C and
>D are connected via frame relay but obviously only use the frame relay
>link to reach A if their own primary link goes down.
>
>C and D have ISDN connections configured to dial B in case both links
>to A go away (Dialer Watch).  Now for the twist....  What if you wanted
>to configure C to dial D when the load on its primary link reached a
>certain point, yet still dial B if both point-to-point links went down?
>
>I haven't completely figured out how to do this yet, but here's a
>start.  You might configure two Dialer profiles, one for each
>destination.  On the major interface on C you'd configure Dialer0 as
>your backup interface and configure an appropriate load.  When the line
>utilization reaches that load, the router would dial Site D.
>
>Then you might configure Dialer Watch on Dialer1 and make it dialer
>Site B if routes originating from Site A disappear.  The difficulty is
>that the Dialer interface that calls Site B would have to have absolute
>priority.  If the primary link goes down, because Dialer0 is configured
>as a backup it might grab the BRI first.  Even if it does get there
>first, when Dialer Watch kicks in, we'd have to have a way to clear the
>line immediately so Dialer1 could dial out.
>
>Is that possible?  Admittedly, I'm a bit weak on DDR of this variety,
>but this sounded like an interesting brain teaser.
>
>Regards,
>John




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