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Chapter 12 Configuring Quality of Service on the ML-Series Card
Understanding IP SLA
The average Round Trip Time (RTT) measured on an ML-Series IP SLA feature is more than the
actual data path latency. In the ML-Series cards, IP SLA is implemented in the software. The IP SLA
messages are processed in the CPU of the ML-Series card. The latency time measured includes the
network latency and CPU processing time. For very accurate IP SLA measurements, it is
recommended that a Cisco Router or Switch be used as an external probe or responder to measure
the RTT of the ML-Series cards in a network.