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One-way latency IP SLA

Hi guys,

I have to test some links with IP SLA but I got some problems :

On my link, I have a RTT of 20 ms, the measure is good but the one-way latency in a direction is 6 ms and the other is 14 ms. Further, the one-way latency measures are not steady.

My transmitter and receiver SLA are synchronized with a NTP GPS and their configs are :

SLA transmitter : cisco 1801

     - iOS : C180X Software (C180X-ADVIPSERVICESK9-M), Version 12.4(4)T7, RELEASE SOFTWARE (fc1)

     - SLA config :

          ip sla 205

           udp-jitter 55050 num-packets 100

           timeout 200

           threshold 150

           frequency 2

          ip sla schedule 205 life forever start-time now

SLA responder : cisco 871

     - iOS : C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)

     - SLA config :

          ip sla responder

Thanks for your answers.