IP SLA

[HOT HOT]

Hi,

I have a problem with two switch 3750X with IP SLA.

Every day I see on the log the message that the IP SLA reachability is down

"Jun  2 15:36:52.885: %TRACKING-5-STATE: 1 ip sla 1 reachability Up->Down"

but when i set the "show ip sla statistics" command i see this:

IPSLA operation id: 1
Latest RTT: 1 milliseconds
Latest operation start time: 09:01:01 ISR Sun Jun 4 2017
Latest operation return code: OK
Number of successes: 491
Number of failures: 0
Operation time to live: Forever

In the statistics I don't see any failure of the tracking and I get this messegess on the log every day and even more than one time

Any suggestions ? 

[Reza Sharifi]

Hi,

Not sure what you is your SLA target (what you are pinging) but it could be that for example the device misses one ping out of 3 and so it logs it but there is no failure triggered it.

HTH

[Julio E. Moisa]

Hi

How is the frequency configured?, could you please share your configuration?

[HOT HOT]

This is the configuration of the ip sla:

ip sla 1
icmp-echo 8.201.255.17 source-ip 8.201.255.19
threshold 20
timeout 800
frequency 5
ip sla schedule 1 life forever start-time now

The round trip time is always on 1-2 ms and there is no failures

How that I don't see the missing pings in the statistics? 

[Julio E. Moisa]

Thank you, is there any track configured?

[HOT HOT]

Of course.

There is a tracking object with the HSRP to decrement the priority when the ip sla gets failure on the tracking object

track 1 ip sla 1 reachability

On the interface vlan:

 standby 81 track 1 decrement 100 (For example on vlan 81)

every day I can see in the log that the HSRP is speaking and goes down to standby and then gets back to active.

Every time i check manually the ping to the destination of this tracking object it is always reachable and the ms is very low. Every time I look at the statistics of ip sla 1 it is always 1 RTT and there is no failures.

what maybe cause this tracking to be unreachable and how can I tweak the values of the ip sla so it won't flaps the priority?