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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Quality of Service (QoS)

Dell Networking OS supports quality of service (QoS).

Differentiated service is accomplished by classifying and queuing traffic, and assigning priorities to those queues.

The switch traffic has four data queues per port. All queues are serviced using the Weighted Round Robin scheduling algorithm. You can only manage prioritize queuing on egress.

  • NOTE: When you enable DCB, the egress QoS features in the output QoS policy-map (such as service-class bandwidth-percentage and bandwidth-percentage), the default bandwidth allocation ratio for egress queues and strict-priority may not work as intended.This is to provide compatibility with DCBX. Hence, it is recommended to have the DCB disabled when you wish to apply these features exclusively.
Table 1. Dell Networking OS Support for Port-Based, Policy-Based, and Multicast QoS Features
FeatureDirection
Port-Based QoS ConfigurationsIngress + Egress
Set dot1p Priorities for Incoming TrafficIngress
Honor dot1p Priorities on Ingress TrafficIngress
Configure Port-based Rate PolicingIngress
Configure Port-based Rate ShapingEgress
Policy-Based QoS ConfigurationsIngress + Egress
Classify TrafficIngress
Create a Layer 3 Class MapIngress
Set DSCP Values for Egress Packets Based on FlowIngress
Create a Layer 2 Class MapIngress
Create a QoS PolicyIngress + Egress
Create an Input QoS PolicyIngress
Configure Policy-Based Rate PolicingIngress
Set a DSCP Value for Egress PacketsIngress
Set a dot1p Value for Egress PacketsIngress
Create an Output QoS PolicyEgress
Configure Policy-Based Rate ShapingEgress
Allocate Bandwidth to the QueueEgress
Configure a Scheduler to QueueEgress
Specify WRED Drop PrecedenceEgress
Create Policy MapsIngress + Egress
Create Input Policy MapsIngress
Honor DSCP Values on Ingress PacketsIngress
Honoring dot1p Values on Ingress PacketsIngress
Create Output Policy MapsEgress
Specify an Aggregate QoS PolicyEgress
QoS Rate Adjustment 
Strict-Priority Queueing 
Weighted Random Early DetectionEgress
Create WRED ProfilesEgress
Figure 1. Dell Networking QoS Architecture Illustration of the Dell Networking QoS Architecture.

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