11-02-2019 02:28 AM - edited 11-02-2019 02:20 PM
We are tracking icmp-echo of remote IP of high BW link under IP SLA and then tracked in an HSRP. Here is the config details of IP SLA:
ip sla 10
icmp-echo x.x.x.x source-ip y.y.y.y
timeout 1000
threshold 500
frequency 3
ip sla schedule 10 life forever start-time-now
track 20 ip sla 10 reachability
We have measured the icmp latency on our WAN link and it's not reaching more than 6 msec and we observe no request time outs icmp packet on our WAN link. Furthermore, we have setup the timeout value to 1000 msec (1 sec). However, for some reason, the IP SLA operation is continuously flapping thus causing fail over to HSRP as well. Since, the interesting traffic is real time, we have setup the frequency and timeout parameters accordingly.
Based on above, can you please guide us why IP SLA is flapping although timeout is not actually reaching and it's value is way above the actual latency (6 msec).
Switching, Other Switches
Regards
11-02-2019 11:00 PM
Hi,
Increase the threshold value. It is seems lower then link latency.
11-03-2019 09:56 AM
11-03-2019 01:55 AM
Hello,
post the output of:
show ip sla statistics
Also, try the values below. A default PING timeout originated from the router is 2 seconds, the default timeout and threshold for the SLA is 5 seconds. If you set the timeout to 1 second, it is less than the default on the router, and that might cause the continuous flapping...
ip sla 10
icmp-echo x.x.x.x source-ip y.y.y.y
timeout 2500
threshold 1000
frequency 3
ip sla schedule 10 life forever start-time-now
track 20 ip sla 10 reachability
11-03-2019 09:53 AM
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