https://supportforums.cisco.com/thread/2024547

get this script

  1. rtr 10
      type echo protocol ipIcmpEcho 10.10.10.10
      timeout 1000
      frequency 3
      request-data-size 32
    rtr schedule 10 life forever start-time now
    !
    event manager applet EEM_PRIMARY_DOWN
      event snmp oid 1.3.6.1.4.1.9.9.42.1.2.9.1.6.10 get-type exact entry-op eq entry-val 1 exit-op eq exit-val 2 poll-interval 3
      action 1.0 syslog msg "Primary link DOWN - Failing over to backup link"
      action 1.1 cli command "enable"
      action 1.2 cli command "configure terminal"
      action 1.3 cli command "ip route 11.11.11.0 255.255.255.0 12.12.12.12"
    !
    event manager applet EEM_PRIMARY_UP
      event snmp oid 1.3.6.1.4.1.9.9.42.1.2.9.1.6.10 get-type exact entry-op eq entry-val 2 exit-op eq exit-val 1 poll-interval 3
      action 1.0 syslog msg "Primary link UP - Failing over to primary link"
      action 1.1 cli command "enable"
      action 1.2 cli command "configure terminal"
      action 1.3 cli command "no ip route 11.11.11.0 255.255.255.0 12.12.12.12"

    !

Cisco C6509E 12.2(18) ipservices_wan 
need try this.
09-14 06:29