Tough one

From: jnkmail4eva@yahoo.com
Date: Thu Sep 07 2006 - 00:59:35 ART


Three routers A, B, C
         _____________
        / A \
       / \
       | |
       \ ospf 0 /
        \ /
         \ B C /
          -----------
         | EIGRP 50 |
          -----------

Router A - S0 in ospf area 0
Router B - S0 in ospf area 0
Router C - S0 in ospf area 0

Router B - E0 in Eigrp 50
Router C - E0 in Eigrp 50

Redistribute between ospf and Eigrp such that

1) C should always chose B as its default connection unless the connection between B and A is down, then it should choose A.
2) B should always chose A as its default connection unless the connection to A is down, then choose C.

So far I have figured out all except for the connection going down between B and
A.
I used some AD manipulation and redistributing loopbacks to achive most of the result.
But there is one part that I haven't been able to achive .i.e when the connection between B and A is down, then C should A to send traffic.
Is there some way to adjust routing protocol behaviour when an interface goes down.
I remember working with ISDN demand circuits but don't think it will work in this case.
Any one want to take a crack at it.
By the way, router A is an ABR so there are routes being sent from other areas to area 0.

TIA



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