How IP SLA works

  1. The source originates a test packet to the destination.

  2. The destination responds to the test packet, at times embedding the needed information in the response packet.

  3. Upon receiving the response, the source calculates the test results based on the timestamp, other packet parameters, and so on.

  4. The source stores the results and updates the history records for the SLA.

  5. The source reschedules the SLA for the next run.


For one-way delay calculations, the IP SLA sender and IP SLA responder must be NTP Time Synchronized.