IP SLA up and down

[athikom.ch]

I have issue  about  config IP SLA

This's Here my config ip sla 

track 3 ip sla 3 reachability

ip sla 3
icmp-echo 8.8.8.8 source-ip 172.16.1.1
timeout 20000
threshold 15000
ip sla schedule 3 life forever start-time now

But I seeing show logging. It has  logging IP SLA up and down  always 

Jun 27 10:29:26.451: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:30:06.580: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:31:26.780: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:32:06.850: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:33:27.032: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:34:07.145: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:35:27.335: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:36:07.473: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:37:27.647: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:38:07.742: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:39:27.925: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:40:08.071: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:41:28.228: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:42:08.332: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:43:28.514: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:44:08.660: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:45:28.826: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:46:08.913: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:47:29.104: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:48:04.183: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:49:24.382: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down
Jun 27 10:50:04.494: %TRACKING-5-STATE: 3 ip sla 3 reachability Down->Up
Jun 27 10:51:24.685: %TRACKING-5-STATE: 3 ip sla 3 reachability Up->Down

I have question 

if you view my config     

I understood  if icmp  reply over 20000 ms [Is 20 Sec]  The object track 3  will  state change up > down 

but I tried test  ping ip to destination from notebook is similar SLA 3  , it not time out  

I don't  understand about   command timeout IP SLA...

Thank for a lot  answer.

[Julio E. Moisa]

Hi

Where you have applied the track 3? try to remove:

timeout 20000
threshold 15000

And just configure 

Frecuency <seconds>

[athikom.ch]

Hi Julio

  I track sla 3 on static route  only

and I remove config  timeout and  threshold 

This'is currently   config now

ip sla 3
icmp-echo 8.8.8.8 source-ip 172.16.1.1
frequency 90
ip sla schedule 3 life forever start-time now

and I will monitor logging by tomorrow

So why i input command  timeout   a lot .the time it's still  down

I would like to  know  the reason this case.

thank  

[Julio E. Moisa]

Hi

It sounds good, i think 90 seconds is very high, the frequency could be between 5 and 20 seconds, the timeout parameter is used to wait for a reply in miliseconds.