Administrator Guide

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 51. Dell Networking OS Support for Port-Based, Policy-Based, and Multicast QoS Features

Feature Direction

Port-Based QoS Configurations Ingress + Egress

Set dot1p Priorities for Incoming Traffic Ingress

Honor dot1p Priorities on Ingress Traffic Ingress

Configure Port-based Rate Policing Ingress

Configure Port-based Rate Shaping Egress

Policy-Based QoS Configurations Ingress + Egress

Classify Traffic Ingress

Create a Layer 3 Class Map Ingress

Set DSCP Values for Egress Packets Based on Flow Ingress

Create a Layer 2 Class Map Ingress

Create a QoS Policy Ingress + Egress

Create an Input QoS Policy Ingress

Configure Policy-Based Rate Policing Ingress

Set a DSCP Value for Egress Packets Ingress

Set a dot1p Value for Egress Packets Ingress

Create an Output QoS Policy Egress

Configure Policy-Based Rate Shaping Egress

Allocate Bandwidth to the Queue Egress

Configure a Scheduler to Queue Egress

Specify WRED Drop Precedence Egress

Quality of Service (QoS) 722