Deployment Guide

Quality of Service (QoS)

Dell Networking OS supports quality of service (QoS).

Dierentiated service is accomplished by classifying and queuing trac, and assigning priorities to those queues.

The switch trac 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 56. Dell Networking OS Support for Port-Based, Policy-Based, and Multicast QoS Features

Feature Direction

Port-Based QoS Congurations Ingress + Egress

Set dot1p Priorities for Incoming Trac Ingress

Honor dot1p Priorities on Ingress Trac Ingress

Congure Port-based Rate Policing Ingress

Congure Port-based Rate Shaping Egress

Policy-Based QoS Congurations Ingress + Egress

Classify Trac 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

Congure 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

Congure Policy-Based Rate Shaping Egress

Allocate Bandwidth to the Queue Egress

Congure a Scheduler to Queue Egress

Specify WRED Drop Precedence Egress

Create Policy Maps Ingress + Egress

Create Input Policy Maps Ingress

Honor DSCP Values on Ingress Packets Ingress

638 Quality of Service (QoS)