Normally set ip next-hop will forward packets when the route-map is matched regardless if the next hop is alive or not. Adding the verify-availability keyword, the router will check the next hop availability via CDP before forwarding the packets, and when next-hop is dead, the packets will be routed through the normal routing table.
set ip next-hop verify-availability
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtpbrtrk.html#wp1057830
set ip next-hop verify-availability
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtpbrtrk.html#wp1057830
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