> ... Each router has a BGP session with the upstream router.

Would it help if you announce different MED values?  That way upstream 
should prefer one while it's up, but fail over to the other when it's not.

-- 
George D M Ross MSc PhD CEng MBCS CITP
University of Edinburgh, School of Informatics,
Appleton Tower, 11 Crichton Street, Edinburgh, Scotland, EH8 9LE
Mail: g...@inf.ed.ac.uk   Voice: 0131 650 5147 
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