In IOS version 12.0(3)T and later, there is a partial solution to this problem. You can specify the set ip next-hop verify-availability command to make the router use CDP to test whether the next-hop device is up:
- Using Policy-Based Routing to Route Based on Source Address
- from Cisco IOS Cookbook, 2nd Edition
- Publisher: O'Reilly Media, Inc.
- Released: December 2006
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