Two models are supported for forwarding class redirection. In the first, the actual instance of a queue group to use for forwarding class redirection is named in the QoS policy. This is called policy-based redirection.
In the second model, the forwarding class queue or policers to apply redirection to are identified in the ingress or egress QoS policy. However, the specific named queue group instance is not identified until a QoS policy is applied to a SAP. This is called SAP-based redirection.
Policy-based redirection allows different forwarding classes in the same QoS policy to be redirected to different queue groups, but it requires at least one QoS policy to be configured per queue group instance.
SAP-based redirection can require less QoS policies to be configured because the policy does not have to name the queue group. However, if redirected, all forwarding classes of a SAP must use the same named queue group instance.
Policy-based redirection is applicable to port queue groups on access ingress and access and network egress, while SAP-based redirection is applicable to forwarding plane queue groups on access and network ingress, and port queue groups on access and network egress.