Question

A network engineer configures an IP SLA UDP jitter operation between two routers to measure one-way delay for a VoIP path. The UDP responder is configured on the destination and the operation completes successfully, reporting round-trip jitter and packet loss statistics. However, the 'show ip sla statistics' output shows all one-way delay (SD and DS) values as 0 ms, even though round-trip time is clearly non-zero. What is the most likely cause?

Accepted Answer

The source and destination router clocks are not synchronized with NTP, so one-way delay measurements cannot be calculated

Answer

The IP SLA responder is missing the 'ip sla responder udp-echo' command for the jitter port

Answer

The operation was configured with a packet interval that is too large for one-way measurements

Answer

Control protocol is disabled, so the responder cannot allocate the dynamic port for the operation