Policies

To evaluate the connection quality of the interfaces used for Dynamic Path Selection, the metrics calculated from the measurement profiles are compared to threshold values, and points (as a score) are awarded. These points added up to determine which is the "best" interface. Certain thresholds can be specified as being "critical" (e.g. jitter <= 30 ms). Dynamic load balancer decisions are based on the points total in combination with the exceeded critical threshold values. A DPS policy collects the threshold values and criticality markings that are required to calculate the total points.

To configure the DPS policies, navigate to the view IP Router > Routing > SD-WAN Dynamic Path Selection > Policies.

Policy

The name of the DPS policy. This name is used to reference the policy in firewall rules. All of the rows in this table with the same policy name are combined into one policy. This makes it possible, for instance, to use the same metric multiple times with different thresholds in the same policy. This allows a points-based grading (e.g. 10 points with a latency <= 100, another 10 points with a latency <= 50).

Measurement profile

Either empty or the name of an ICMP measurement profile.

Important: The field must be empty if and only if the SLA metric is set to "Load(%)". In all other cases, a measurement profile must be specified.

SLA metric

This is the metric generated from the measurements of the set measurement profile. The value of metric is compared to the threshold value. Possible values:

• Latency (ms)
• Jitter (ms)
• Packet loss (%)
• Load (%)

Important: The metric "Load(%)" denotes the utilization of the interface in percent of the maximum bandwidth. As this value is not determined using separate measurements, the entry Threshold must be left empty.

Threshold

Threshold which the chosen SLA metric should not undershot.

Score

If a metric undershoots the chosen threshold, the points are added to the overall result of the policy.

Critical

Marks whether a threshold is critical. If a threshold value marked as "critical" is not undershot, the overall result is not defined.

Important: An interface with an undefined overall result cannot be selected by a dynamic load balancer decision.