# Define link selection options in QoS Class elements

Link selection options in the properties of QoS Class elements specify how important different quality metrics are for traffic that is associated with the QoS Class. Traffic uses the ISP link that best matches the link selection options.

## Before you begin

Create one or more custom QoS Class elements.

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Note: You cannot define link selection criteria for the default QoS Class elements.

For more details about the product and how to configure features, click Help or press F1.

## Steps

1. Select Configuration, then browse to SD-WAN.
2. Browse to Other Elements > QoS Classes.
3. Right-click a QoS Class element, then select Properties.
4. Select Override Link Selection Preferences set in Network Applications and Protocol Agents.
5. Configure the settings, then click OK.

## QoS Class Properties dialog box

Use this dialog box to define the properties of a QoS Class.

Option | Definition
--- | ---
Name | The name of the element.
Override Link Selection Preferences set in Network Applications and Protocol Agents | When selected, the link selection options defined in the QoS Class element override the default link selection options in the properties of Network Application elements and Protocol elements of the Protocol Agent type. Selecting this option allows you to edit the other link selection options.
Bandwidth | Specifies how important the bandwidth of the connection is for determining which link traffic uses.
Jitter | Specifies how important variations in the delay of received packets is for determining which link traffic uses.
Latency | Specifies how important delays in packet transmission are for determining which link traffic uses.
Packet Loss | Specifies how important the number of packets of data that fail to reach their destination are for determining which link traffic uses.
Stability | Specifies how important variations in the availability and quality of the connection are for determining which link traffic uses.
Category (Optional) | Includes the element in predefined categories. Click Select to select a category.
Comment (Optional) | A comment for your own reference.