I met an issue by using IP SLA UDP jitter. below is my configuration, the link bW is 256K SDH
ip sla monitor 1
type jitter dest-ipaddr 10.2.17.5 dest-port 49009 source-ipaddr 10.2.17.9 num-packets 50 interval 200
ip sla monitor schedule 1 life forever start-time now
Below is part of show ip sla monitor operation 1
OWMinSD: 24 OWMaxSD: 26
OWMinDS: 24 OWMaxDS: 625
My issue is that normally the SD is quit stable but the DS is varied very offen, some time is 18-40ms, some time is 200-2000ms. I also found if there is not customer traffic the timer of SD and DS is same. the issue is occured only when the customer is working. Therefore the RTT is quit unstable.
I have also checked the customer traffic capacity. From source to destination is around 5-10K, and from destination to source is around 40-100K. meaning the BW is not occupied by customer traffic.
How can I realize the RTT is stable?
I have confused for this issue for long time. Could anybody can help me solve this? Is there any unsuitable configuration?
It looks like the DS is at almost 50% util some of the time which may be enough to cause increased jitter. Can you correlate jitter high points with B/W usage?