the administrator of a largo company noticed thatthere are some problems with UCC sessions on...

The administrator observes IP SLA jitter monitoring results spiking to 100% when monitoring UCC sessions. This indicates either extremely severe network jitter or, more likely, a problem with the IP SLA operation or measurement itself on the AOS-CX switch.  

IP SLA & Jitter:IP SLA measures jitter by analyzing the inter-packet delay variation of probe packets. Accurate measurements depend on the switch generating and processing these probes consistently.

Factors Affecting IP SLA Accuracy:

Switch Resource Contention:If the switch's CPU or memory is heavily utilized, the operating system might not schedule the IP SLA process promptly. This can lead to inconsistent generation or processing of probe packets, causing highly inaccurate measurements, including extreme jitter values like 100%.

Control Plane Policing (CoPP):IP SLA packets are control plane traffic. If CoPP policies are too restrictive, they might drop or delay IP SLA probes, skewing results.

Network Path Issues:Actual severe jitter on the network path would also cause high readings, but 100% spikes often suggest measurement error first.

Troubleshooting Steps:When encountering unexpectedly high or erratic IP SLA results, the first step is often to rule out issues with the monitoring device itself.

Analysis of Options:

A. memory and processor usage: Checking the switch's resource utilization is crucial. High CPU/memory load can directly impact the timing accuracy of IP SLA operations.

B. source IP and source port combination: Unlikely to cause 100% jitter spikes unless fundamentally misconfigured causing probe failure.

C. number of NAE agents: NAE agents consume resources, but checking overall CPU/memory (A) is more direct.

D. CoPP settings: A valid concern, as CoPP affects control plane traffic. However, checking overall system load (A) is typically a primary check before delving into specific policies like CoPP.

Conclusion:High memory and processor usage (Option A) on the switch running the IP SLA operation is a common cause for inaccurate timing and resulting erroneous jitter measurements. This should be checked first to ensure the monitoring platform itself is functioning correctly.