IP SLA calculates the round-trip time from the timing information provided in the packet. If the packet is late or out-of-order, IP SLA updates the corresponding counter for the entry and disregards the rest of the data.
If IP SLA needs to correlate this data into a distribution or history collection, the event is stored accordingly.
If an ICMP timing probe assigned to an IP SLA entry is placed out of service while the IP SLA entry is running, the IP SLA entry will not report statistics until the ICMP timing probe is placed back in service.
The statistics for each test is stored in an IP SLA entry collection, which you can view with the show sla commands. For more information, see IP SLA Display Commands.
The statistics are stored locally on each blade. If a failover occurs on the blade, the IP SLA data is lost.