Dell Force10 S4820T FTOS Command Reference Guide - Page 1229

2. If aggregate input QoS policy and per class input QoS policy co-exist, then aggregate input QoS policy will preempt per class input QoS policy on input traffic conditioning (rate-police). In other words, if rate police configuration exists in aggregate QoS policy, the rate police configurations in per class QoS are ignored. Marking configurations in per class input QoS policy still apply to each queue. E-Series Aggregate input/output QoS policy applies to all the port ingoing/outgoing traffic. Aggregate input/output QoS policy can co-exist with per queue input/output QoS policies. 1. If only an aggregate input QoS policy exists, input traffic conditioning configurations (rate-police) will apply. Any marking configurations in the aggregate input QoS policy will be ignored. 2. If an aggregate input QoS policy and a per-class input QoS policy co-exist, then the aggregate input QoS policy will preempt the per-class input QoS policy on input traffic conditioning (rate-police). In other words, if a rate police configuration exists in the aggregate QoS policy, the rate police configurations in the per-class QoS are ignored. Marking configurations in the per-class input QoS policy still apply to each queue. 3. If only an aggregate output QoS policy exists, egress traffic conditioning configurations (rate-limit and rate-shape) in the aggregate output QoS policy will apply. Scheduling and queuing configurations in the aggregate output QoS policy (if existing) are ignored. Each queue will use default scheduling and queuing configuration (Weighted Random Early Detection (WRED) and Bandwidth). 4. If the aggregate output QoS policy and per-queue output QoS policy co-exist, the aggregate output QoS policy will preempt a per-queue output QoS policy on egress traffic conditioning (rate-limit). In other words, if a rate limit configuration exists in the aggregate output QoS policy, the rate limit configurations in per-queue output QoS policies are ignored. Scheduling and queuing configurations (WRED and Bandwidth) in the per-queue output QoS policy still apply to each queue. Related Commands policy-map-input policy-map-output Create an input policy map Create an output policy map (E-Series Only) policy-map-input c e s Create an input policy map. Syntax policy-map-input policy-map-name [layer2] To remove an input policy map, use the no policy-map-input policy-map-name [layer2] command. Parameters policy-map-name layer2 Enter the name for the policy map in character format (32 characters maximum). (OPTIONAL) Enter the keyword layer2 to specify a Layer 2 Class Map. Default: Layer 3 Quality of Service (QoS) | 1229