High-priority-only buffers are defined on a queue and allow buffers to be reserved for traffic classified as high priority. When the queue depth reaches a specified level, only high-priority traffic can be enqueued. The high-priority-only reservation for a queue is defined as a percentage of the MBS value and has a default value of 10% of the MBS value.
On service ingress, the high-priority-only reservation for a queue is defined in the service ingress QoS policy. High-priority traffic is specified in the match criteria for the policy.
On service egress, the high-priority-only reservation for a queue is defined in the service egress QoS policy. Service egress queues are specified by forwarding class. High-priority traffic for a given traffic class is traffic that has been marked as in-profile either on ingress classification or based on interpretation of the QoS markings.
The high-priority-only buffers for network queues are defined within network queue policies based on the forwarding class. High-priority-only traffic for a specific traffic class is marked as in-profile either on ingress classification or based on interpretation of the QoS markings.