Traffic Rules
Traffic Rules define how traffic is classified in the SD-WAN service. They identify which packets belong to which class of traffic.
A Traffic Rule contains one or more rules that match traffic using criteria such as:
Source IP address
Destination IP address
Protocol
Source or destination ports
DSCP (Differentiated Services Code Point) value
Application
LAN label, which identifies the source interface
Traffic Rules are used as input to Overlays. Each Overlay can reference one or more Traffic Rules. For each Traffic Rule used by an Overlay, you configure the related QoS and link-sharing settings, including the Link Sharing Policy and Link Sharing Weight.
Role in the Model
Traffic Rules determine how LAN user traffic is classified before it is handled by an Overlay. After traffic matches a Traffic Rule, the Overlay can apply the appropriate IP routing behavior and QoS treatment based on the WAN policy defined for that class of traffic.
In practice, Traffic Rules provide the link between traffic identification and traffic steering. They answer the question: What kind of traffic is this? The Overlay then decides how that traffic should be forwarded.