Overlay Traffic Policy
An Overlay Traffic Policy defines how a specific class of traffic is treated on a specific Overlay. It is created when a Traffic Rule is attached to an Overlay.
The Overlay Traffic Policy is not a standalone object. It corresponds to the QoS and link-sharing settings configured for a Traffic Rule within an Overlay.
For each Traffic Rule attached to an Overlay, the policy defines the per-class behavior for that traffic, including:
How the traffic is queued or prioritized
Which WAN links can be used
How traffic is shared across eligible WAN links
Whether traffic is marked on the WAN underlay
Typical fields include:
Field | Purpose |
|---|---|
Strategy (formerly Link Sharing Policies) | Defines the method used to select or share traffic across WAN links. |
Link Sharing Weight | Defines the relative preference or distribution weight for eligible WAN links. |
WAN Differentiated Services Code Point (DSCP) | Optionally marks traffic on the WAN underlay for QoS treatment outside the overlay. |
Role in the Model
The Overlay Traffic Policy links a classified traffic class to its forwarding behavior on an Overlay.
The Traffic Rule identifies the traffic. The Overlay defines the transport path. The Overlay Traffic Policy defines how that traffic uses the available WAN links and QoS treatment within that path.
The Link Sharing Policy and Link Sharing Weight are evaluated for each traffic class in the context of the Overlay and the Site’s WAN labels. This means the same Traffic Rule can have different WAN behavior depending on the Overlay where it is used.