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I have a ip sla problem IOS 15.1

I have following configuration but when fail track the route don't is deleted


ip sla 1 

icmp-echo source-ip

threshold 3

frequency 5

ip sla schedule 1 life forever start-time now

track 1 ip sla 1 reachability

delay down 10 up 30

ip route Dialer1 name xDSL_GVT track 1

2921#sh ip sla configuration 1

IP SLAs Infrastructure Engine-III

Entry number: 1



Operation timeout (milliseconds): 5000

Type of operation to perform: icmp-echo

Target address/Source address:

Type Of Service parameter: 0x0

Request size (ARR data portion): 28

Verify data: No

Vrf Name:


   Operation frequency (seconds): 5  (not considered if randomly scheduled)

   Next Scheduled Start Time: Start Time already passed

   Group Scheduled : FALSE

   Randomly Scheduled : FALSE

   Life (seconds): Forever

   Entry Ageout (seconds): never

   Recurring (Starting Everyday): FALSE

   Status of entry (SNMP RowStatus): Active

Threshold (milliseconds): 3

Distribution Statistics:

   Number of statistic hours kept: 2

   Number of statistic distribution buckets kept: 1

   Statistic distribution interval (milliseconds): 20

Enhanced History:

History Statistics:

   Number of history Lives kept: 0

   Number of history Buckets kept: 15

   History Filter Type: None

2921#sh ip sla stat 1

IPSLAs Latest Operation Statistics

IPSLA operation id: 1

    Latest RTT: 4 milliseconds

Latest operation start time: 14:57:03.498 BRT Thu Dec 8 2011

Latest operation return code: Over threshold

Number of successes: 272

Number of failures: 0

Operation time to live: Forever

2921#sh track 1

Track 1

  IP SLA 1 reachability

  Reachability is Up

    17245 changes, last change 02:25:55

  Delay up 30 secs, down 10 secs

  Latest operation return code: Over threshold

  Latest RTT (millisecs) 4