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Application QoE
Application QoE is a measure of Quality of Experience of applications in the SD-WAN network. It measures the quality of applications that flow through the virtual paths between two SD-WAN appliances. The Application QoE score is a value between 0 and 10. The score range that it falls in determines the quality of an application.
Quality | Range |
---|---|
Good | 8–10 |
Fair | 4–8 |
Poor | 0–4 |
Application QoE score can be used to measure quality of applications and identify problematic trends.
You can define the quality thresholds for real-time and interactive appliances using QoE profiles, and map these profiles to applications or applications objects.
Note
To monitor Application QoE, it is essential to enable Deep Packet Inspection. For more information, see Application classification.
Real-time application QoE
The Application QoE calculation for real-time applications uses a Citrix innovative technique, which is derived from MOS score.
The default threshold values are:
- Latency threshold: 160 ms
- Jitter Threshold: 30 ms
- Packet loss threshold: 2%
A flow of a real-time application that meets the thresholds for latency, loss, and jitter is considered to be of good quality.
QoE for Real-time applications is determined from the percentage of flows that meet the threshold divided by the total number of flow samples.
QoE for Real-time = (No of flow samples that meet the threshold / Total no of flow samples) * 100
It is represented as QoE score ranging from 0 to 10.
You can create QoE profiles with custom threshold values and apply to applications or application objects.
Note
The QoE value can be zero if the network conditions are outside of the configured thresholds for real-time traffic.
Interactive application QoE
The Application QoE for interactive applications uses a Citrix innovative technique based on packet loss and burst rate thresholds.
Interactive applications are sensitive to packet loss and throughput. Therefore, we measure the packet loss percentage, and the burst rate of ingress and egress traffic in a flow.
The configurable thresholds are:
- Packet loss percentage.
- Percentage of expected egress burst rate in comparison to the ingress burst rate.
The default threshold values are:
- Packet loss threshold: 1%
- Burst rate: 60%
A flow is of good quality if the following conditions are met:
-
The percentage loss for a flow is less that the configured threshold.
-
The egress burst rate is at least the configured percentage of ingress burst rate.
Configuring application QoE
Map application or application objects to default or custom QoE profiles. You can create custom QoE profiles for real-time and interactive traffic and map up to 10 applications or application objects with QoE profiles.
To create custom QoE profiles through Citrix SD-WAN Orchestrator service, see Application QoE profiles.
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